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gecko-dev/layout/base/PresShell.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* a presentation of a document, part 2 */
#include "mozilla/PresShell.h"
#include "mozilla/dom/FontFaceSet.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/Attributes.h"
#include "mozilla/AutoRestore.h"
#include "mozilla/StyleSheetInlines.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/EventStates.h"
#include "mozilla/IMEStateManager.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/dom/TabChild.h"
#include "mozilla/Likely.h"
#include "mozilla/Logging.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/Sprintf.h"
#include "mozilla/TextEvents.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/TouchEvents.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/Unused.h"
#include <algorithm>
#ifdef XP_WIN
#include "winuser.h"
#endif
#include "gfxContext.h"
#include "gfxPrefs.h"
#include "gfxUserFontSet.h"
#include "nsContentList.h"
#include "nsPresContext.h"
#include "nsIContent.h"
#include "nsIContentIterator.h"
#include "nsIPresShellInlines.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/Event.h" // for Event::GetEventPopupControlState()
#include "mozilla/dom/PointerEventHandler.h"
#include "nsIDocument.h"
#include "nsAnimationManager.h"
#include "nsNameSpaceManager.h" // for Pref-related rule management (bugs 22963,20760,31816)
#include "nsFrame.h"
#include "FrameLayerBuilder.h"
#include "nsViewManager.h"
#include "nsView.h"
#include "nsCRTGlue.h"
#include "prinrval.h"
#include "nsTArray.h"
#include "nsCOMArray.h"
#include "nsContainerFrame.h"
#include "mozilla/dom/Selection.h"
#include "nsGkAtoms.h"
#include "nsRange.h"
#include "nsWindowSizes.h"
#include "nsCOMPtr.h"
#include "nsAutoPtr.h"
#include "nsReadableUtils.h"
#include "nsIPageSequenceFrame.h"
#include "nsIPermissionManager.h"
#include "nsIMozBrowserFrame.h"
#include "nsCaret.h"
#include "mozilla/AccessibleCaretEventHub.h"
#include "nsFrameManager.h"
#include "nsXPCOM.h"
#include "nsILayoutHistoryState.h"
#include "nsILineIterator.h" // for ScrollContentIntoView
#include "PLDHashTable.h"
#include "mozilla/dom/Touch.h"
#include "mozilla/dom/TouchEvent.h"
#include "mozilla/dom/PointerEventBinding.h"
#include "nsIObserverService.h"
#include "nsDocShell.h" // for reflow observation
#include "nsIBaseWindow.h"
#include "nsError.h"
#include "nsLayoutUtils.h"
#include "nsViewportInfo.h"
#include "nsCSSRendering.h"
// for |#ifdef DEBUG| code
#include "prenv.h"
#include "nsDisplayList.h"
#include "nsRegion.h"
#include "nsAutoLayoutPhase.h"
#ifdef MOZ_GECKO_PROFILER
#include "AutoProfilerStyleMarker.h"
#endif
#ifdef MOZ_REFLOW_PERF
#include "nsFontMetrics.h"
#endif
#include "PositionedEventTargeting.h"
#include "nsIReflowCallback.h"
#include "nsPIDOMWindow.h"
#include "nsFocusManager.h"
#include "nsIObjectFrame.h"
#include "nsIObjectLoadingContent.h"
#include "nsNetUtil.h"
#include "nsThreadUtils.h"
#include "nsStyleSheetService.h"
#include "gfxUtils.h"
#include "nsSMILAnimationController.h"
#include "SVGContentUtils.h"
#include "SVGObserverUtils.h"
#include "SVGFragmentIdentifier.h"
#include "nsFrameSelection.h"
#include "mozilla/dom/Performance.h"
#include "nsRefreshDriver.h"
#include "nsDOMNavigationTiming.h"
// Drag & Drop, Clipboard
#include "nsIDocShellTreeItem.h"
#include "nsIURI.h"
#include "nsIScrollableFrame.h"
#include "nsITimer.h"
#ifdef ACCESSIBILITY
#include "nsAccessibilityService.h"
#include "mozilla/a11y/DocAccessible.h"
#ifdef DEBUG
#include "mozilla/a11y/Logging.h"
#endif
#endif
// For style data reconstruction
#include "nsStyleChangeList.h"
#include "nsCSSFrameConstructor.h"
#ifdef MOZ_XUL
#include "nsMenuFrame.h"
#include "nsTreeBodyFrame.h"
#include "nsIBoxObject.h"
#include "nsITreeBoxObject.h"
#include "nsMenuPopupFrame.h"
#include "nsTreeColumns.h"
#include "nsIDOMXULMultSelectCntrlEl.h"
#include "nsIDOMXULSelectCntrlItemEl.h"
#include "nsIDOMXULMenuListElement.h"
#include "nsXULElement.h"
#include "mozilla/dom/BoxObject.h"
#endif // MOZ_XUL
#include "mozilla/layers/CompositorBridgeChild.h"
#include "ClientLayerManager.h"
#include "GeckoProfiler.h"
#include "gfxPlatform.h"
#include "Layers.h"
#include "LayerTreeInvalidation.h"
#include "mozilla/css/ImageLoader.h"
#include "mozilla/dom/DocumentTimeline.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/Preferences.h"
#include "mozilla/Telemetry.h"
#include "nsCanvasFrame.h"
#include "nsIImageLoadingContent.h"
#include "nsImageFrame.h"
#include "nsIScreen.h"
#include "nsIScreenManager.h"
#include "nsPlaceholderFrame.h"
#include "nsTransitionManager.h"
#include "ChildIterator.h"
#include "mozilla/RestyleManager.h"
#include "nsIDragSession.h"
#include "nsIFrameInlines.h"
#include "mozilla/gfx/2D.h"
#include "nsSubDocumentFrame.h"
#include "nsQueryObject.h"
#include "nsLayoutStylesheetCache.h"
#include "mozilla/layers/InputAPZContext.h"
#include "mozilla/layers/FocusTarget.h"
#include "mozilla/layers/WebRenderLayerManager.h"
#include "mozilla/layers/WebRenderUserData.h"
#include "mozilla/ServoBindings.h"
#include "mozilla/ServoStyleSet.h"
#include "mozilla/StyleSheet.h"
#include "mozilla/StyleSheetInlines.h"
#include "mozilla/dom/ImageTracker.h"
#include "nsIDocShellTreeOwner.h"
#include "nsBindingManager.h"
#include "nsClassHashtable.h"
#include "nsHashKeys.h"
#ifdef MOZ_TASK_TRACER
#include "GeckoTaskTracer.h"
using namespace mozilla::tasktracer;
#endif
#define ANCHOR_SCROLL_FLAGS \
(nsIPresShell::SCROLL_OVERFLOW_HIDDEN | nsIPresShell::SCROLL_NO_PARENT_FRAMES)
// define the scalfactor of drag and drop images
// relative to the max screen height/width
#define RELATIVE_SCALEFACTOR 0.0925f
using namespace mozilla;
using namespace mozilla::css;
using namespace mozilla::dom;
using namespace mozilla::gfx;
using namespace mozilla::layers;
using namespace mozilla::gfx;
using namespace mozilla::layout;
using PaintFrameFlags = nsLayoutUtils::PaintFrameFlags;
typedef FrameMetrics::ViewID ViewID;
CapturingContentInfo nsIPresShell::gCaptureInfo =
{ false /* mAllowed */, false /* mPointerLock */, false /* mRetargetToElement */,
false /* mPreventDrag */ };
nsIContent* nsIPresShell::gKeyDownTarget;
// RangePaintInfo is used to paint ranges to offscreen buffers
struct RangePaintInfo {
RefPtr<nsRange> mRange;
nsDisplayListBuilder mBuilder;
nsDisplayList mList;
// offset of builder's reference frame to the root frame
nsPoint mRootOffset;
RangePaintInfo(nsRange* aRange, nsIFrame* aFrame)
: mRange(aRange)
, mBuilder(aFrame, nsDisplayListBuilderMode::PAINTING, false)
{
MOZ_COUNT_CTOR(RangePaintInfo);
mBuilder.BeginFrame();
}
~RangePaintInfo()
{
mList.DeleteAll(&mBuilder);
mBuilder.EndFrame();
MOZ_COUNT_DTOR(RangePaintInfo);
}
};
#undef NOISY
// ----------------------------------------------------------------------
#ifdef DEBUG
// Set the environment variable GECKO_VERIFY_REFLOW_FLAGS to one or
// more of the following flags (comma separated) for handy debug
// output.
static uint32_t gVerifyReflowFlags;
struct VerifyReflowFlags {
const char* name;
uint32_t bit;
};
static const VerifyReflowFlags gFlags[] = {
{ "verify", VERIFY_REFLOW_ON },
{ "reflow", VERIFY_REFLOW_NOISY },
{ "all", VERIFY_REFLOW_ALL },
{ "list-commands", VERIFY_REFLOW_DUMP_COMMANDS },
{ "noisy-commands", VERIFY_REFLOW_NOISY_RC },
{ "really-noisy-commands", VERIFY_REFLOW_REALLY_NOISY_RC },
{ "resize", VERIFY_REFLOW_DURING_RESIZE_REFLOW },
};
#define NUM_VERIFY_REFLOW_FLAGS (sizeof(gFlags) / sizeof(gFlags[0]))
static void
ShowVerifyReflowFlags()
{
printf("Here are the available GECKO_VERIFY_REFLOW_FLAGS:\n");
const VerifyReflowFlags* flag = gFlags;
const VerifyReflowFlags* limit = gFlags + NUM_VERIFY_REFLOW_FLAGS;
while (flag < limit) {
printf(" %s\n", flag->name);
++flag;
}
printf("Note: GECKO_VERIFY_REFLOW_FLAGS is a comma separated list of flag\n");
printf("names (no whitespace)\n");
}
#endif
//========================================================================
//========================================================================
//========================================================================
#ifdef MOZ_REFLOW_PERF
class ReflowCountMgr;
static const char kGrandTotalsStr[] = "Grand Totals";
// Counting Class
class ReflowCounter {
public:
explicit ReflowCounter(ReflowCountMgr * aMgr = nullptr);
~ReflowCounter();
void ClearTotals();
void DisplayTotals(const char * aStr);
void DisplayDiffTotals(const char * aStr);
void DisplayHTMLTotals(const char * aStr);
void Add() { mTotal++; }
void Add(uint32_t aTotal) { mTotal += aTotal; }
void CalcDiffInTotals();
void SetTotalsCache();
void SetMgr(ReflowCountMgr * aMgr) { mMgr = aMgr; }
uint32_t GetTotal() { return mTotal; }
protected:
void DisplayTotals(uint32_t aTotal, const char * aTitle);
void DisplayHTMLTotals(uint32_t aTotal, const char * aTitle);
uint32_t mTotal;
uint32_t mCacheTotal;
ReflowCountMgr * mMgr; // weak reference (don't delete)
};
// Counting Class
class IndiReflowCounter {
public:
explicit IndiReflowCounter(ReflowCountMgr * aMgr = nullptr)
: mFrame(nullptr),
mCount(0),
mMgr(aMgr),
mCounter(aMgr),
mHasBeenOutput(false)
{}
virtual ~IndiReflowCounter() {}
nsAutoString mName;
nsIFrame * mFrame; // weak reference (don't delete)
int32_t mCount;
ReflowCountMgr * mMgr; // weak reference (don't delete)
ReflowCounter mCounter;
bool mHasBeenOutput;
};
//--------------------
// Manager Class
//--------------------
class ReflowCountMgr {
public:
ReflowCountMgr();
virtual ~ReflowCountMgr();
void ClearTotals();
void ClearGrandTotals();
void DisplayTotals(const char * aStr);
void DisplayHTMLTotals(const char * aStr);
void DisplayDiffsInTotals();
void Add(const char * aName, nsIFrame * aFrame);
ReflowCounter * LookUp(const char * aName);
void PaintCount(const char *aName, gfxContext* aRenderingContext,
nsPresContext *aPresContext, nsIFrame *aFrame,
const nsPoint &aOffset, uint32_t aColor);
FILE * GetOutFile() { return mFD; }
void SetPresContext(nsPresContext * aPresContext) { mPresContext = aPresContext; } // weak reference
void SetPresShell(nsIPresShell* aPresShell) { mPresShell= aPresShell; } // weak reference
void SetDumpFrameCounts(bool aVal) { mDumpFrameCounts = aVal; }
void SetDumpFrameByFrameCounts(bool aVal) { mDumpFrameByFrameCounts = aVal; }
void SetPaintFrameCounts(bool aVal) { mPaintFrameByFrameCounts = aVal; }
bool IsPaintingFrameCounts() { return mPaintFrameByFrameCounts; }
protected:
void DisplayTotals(uint32_t aTotal, uint32_t * aDupArray, char * aTitle);
void DisplayHTMLTotals(uint32_t aTotal, uint32_t * aDupArray, char * aTitle);
void DoGrandTotals();
void DoIndiTotalsTree();
// HTML Output Methods
void DoGrandHTMLTotals();
nsClassHashtable<nsCharPtrHashKey, ReflowCounter> mCounts;
nsClassHashtable<nsCharPtrHashKey, IndiReflowCounter> mIndiFrameCounts;
FILE * mFD;
bool mDumpFrameCounts;
bool mDumpFrameByFrameCounts;
bool mPaintFrameByFrameCounts;
bool mCycledOnce;
// Root Frame for Individual Tracking
nsPresContext * mPresContext;
nsIPresShell* mPresShell;
// ReflowCountMgr gReflowCountMgr;
};
#endif
//========================================================================
// comment out to hide caret
#define SHOW_CARET
// The upper bound on the amount of time to spend reflowing, in
// microseconds. When this bound is exceeded and reflow commands are
// still queued up, a reflow event is posted. The idea is for reflow
// to not hog the processor beyond the time specifed in
// gMaxRCProcessingTime. This data member is initialized from the
// layout.reflow.timeslice pref.
#define NS_MAX_REFLOW_TIME 1000000
static int32_t gMaxRCProcessingTime = -1;
struct nsCallbackEventRequest
{
nsIReflowCallback* callback;
nsCallbackEventRequest* next;
};
// ----------------------------------------------------------------------------
//
// NOTE(emilio): It'd be nice for this to assert that our document isn't in the
// bfcache, but font pref changes don't care about that, and maybe / probably
// shouldn't.
#ifdef DEBUG
#define ASSERT_REFLOW_SCHEDULED_STATE() \
{ \
if (ObservingLayoutFlushes()) { \
MOZ_ASSERT(mDocument->GetBFCacheEntry() || \
mPresContext->RefreshDriver()->IsLayoutFlushObserver(this), \
"Unexpected state"); \
} else { \
MOZ_ASSERT(!mPresContext->RefreshDriver()->IsLayoutFlushObserver(this), \
"Unexpected state"); \
} \
}
#else
#define ASSERT_REFLOW_SCHEDULED_STATE() /* nothing */
#endif
class nsAutoCauseReflowNotifier
{
public:
explicit nsAutoCauseReflowNotifier(PresShell* aShell)
: mShell(aShell)
{
mShell->WillCauseReflow();
}
~nsAutoCauseReflowNotifier()
{
// This check should not be needed. Currently the only place that seem
// to need it is the code that deals with bug 337586.
if (!mShell->mHaveShutDown) {
mShell->DidCauseReflow();
}
else {
nsContentUtils::RemoveScriptBlocker();
}
}
PresShell* mShell;
};
class MOZ_STACK_CLASS nsPresShellEventCB : public EventDispatchingCallback
{
public:
explicit nsPresShellEventCB(PresShell* aPresShell) : mPresShell(aPresShell) {}
virtual void HandleEvent(EventChainPostVisitor& aVisitor) override
{
if (aVisitor.mPresContext && aVisitor.mEvent->mClass != eBasicEventClass) {
if (aVisitor.mEvent->mMessage == eMouseDown ||
aVisitor.mEvent->mMessage == eMouseUp) {
// Mouse-up and mouse-down events call nsFrame::HandlePress/Release
// which call GetContentOffsetsFromPoint which requires up-to-date layout.
// Bring layout up-to-date now so that GetCurrentEventFrame() below
// will return a real frame and we don't have to worry about
// destroying it by flushing later.
mPresShell->FlushPendingNotifications(FlushType::Layout);
} else if (aVisitor.mEvent->mMessage == eWheel &&
aVisitor.mEventStatus != nsEventStatus_eConsumeNoDefault) {
nsIFrame* frame = mPresShell->GetCurrentEventFrame();
if (frame) {
// chrome (including addons) should be able to know if content
// handles both D3E "wheel" event and legacy mouse scroll events.
// We should dispatch legacy mouse events before dispatching the
// "wheel" event into system group.
RefPtr<EventStateManager> esm =
aVisitor.mPresContext->EventStateManager();
esm->DispatchLegacyMouseScrollEvents(frame,
aVisitor.mEvent->AsWheelEvent(),
&aVisitor.mEventStatus);
}
}
nsIFrame* frame = mPresShell->GetCurrentEventFrame();
if (!frame &&
(aVisitor.mEvent->mMessage == eMouseUp ||
aVisitor.mEvent->mMessage == eTouchEnd)) {
// Redirect BUTTON_UP and TOUCH_END events to the root frame to ensure
// that capturing is released.
frame = mPresShell->GetRootFrame();
}
if (frame) {
frame->HandleEvent(aVisitor.mPresContext,
aVisitor.mEvent->AsGUIEvent(),
&aVisitor.mEventStatus);
}
}
}
RefPtr<PresShell> mPresShell;
};
class nsBeforeFirstPaintDispatcher : public Runnable
{
public:
explicit nsBeforeFirstPaintDispatcher(nsIDocument* aDocument)
: mozilla::Runnable("nsBeforeFirstPaintDispatcher")
, mDocument(aDocument)
{
}
// Fires the "before-first-paint" event so that interested parties (right now, the
// mobile browser) are aware of it.
NS_IMETHOD Run() override
{
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
observerService->NotifyObservers(mDocument, "before-first-paint",
nullptr);
}
return NS_OK;
}
private:
nsCOMPtr<nsIDocument> mDocument;
};
// This is a helper class to track whether the targeted frame is destroyed after
// dispatching pointer events. In that case, we need the original targeted
// content so that we can dispatch the mouse events to it.
class MOZ_STACK_CLASS AutoPointerEventTargetUpdater final
{
public:
AutoPointerEventTargetUpdater(PresShell* aShell,
WidgetEvent* aEvent,
nsIFrame* aFrame,
nsIContent** aTargetContent)
{
MOZ_ASSERT(aEvent);
if (!aTargetContent || aEvent->mClass != ePointerEventClass) {
// Make the destructor happy.
mTargetContent = nullptr;
return;
}
MOZ_ASSERT(aShell);
MOZ_ASSERT(aFrame);
MOZ_ASSERT(!aFrame->GetContent() ||
aShell->GetDocument() == aFrame->GetContent()->OwnerDoc());
MOZ_ASSERT(PointerEventHandler::IsPointerEventEnabled());
mShell = aShell;
mWeakFrame = aFrame;
mTargetContent = aTargetContent;
aShell->mPointerEventTarget = aFrame->GetContent();
}
~AutoPointerEventTargetUpdater()
{
if (!mTargetContent || !mShell || mWeakFrame.IsAlive()) {
return;
}
mShell->mPointerEventTarget.swap(*mTargetContent);
}
private:
RefPtr<PresShell> mShell;
AutoWeakFrame mWeakFrame;
nsIContent** mTargetContent;
};
bool PresShell::sDisableNonTestMouseEvents = false;
mozilla::LazyLogModule PresShell::gLog("PresShell");
mozilla::TimeStamp PresShell::sLastInputCreated;
mozilla::TimeStamp PresShell::sLastInputProcessed;
bool PresShell::sProcessInteractable = false;
static bool gVerifyReflowEnabled;
bool
nsIPresShell::GetVerifyReflowEnable()
{
#ifdef DEBUG
static bool firstTime = true;
if (firstTime) {
firstTime = false;
char* flags = PR_GetEnv("GECKO_VERIFY_REFLOW_FLAGS");
if (flags) {
bool error = false;
for (;;) {
char* comma = PL_strchr(flags, ',');
if (comma)
*comma = '\0';
bool found = false;
const VerifyReflowFlags* flag = gFlags;
const VerifyReflowFlags* limit = gFlags + NUM_VERIFY_REFLOW_FLAGS;
while (flag < limit) {
if (PL_strcasecmp(flag->name, flags) == 0) {
gVerifyReflowFlags |= flag->bit;
found = true;
break;
}
++flag;
}
if (! found)
error = true;
if (! comma)
break;
*comma = ',';
flags = comma + 1;
}
if (error)
ShowVerifyReflowFlags();
}
if (VERIFY_REFLOW_ON & gVerifyReflowFlags) {
gVerifyReflowEnabled = true;
printf("Note: verifyreflow is enabled");
if (VERIFY_REFLOW_NOISY & gVerifyReflowFlags) {
printf(" (noisy)");
}
if (VERIFY_REFLOW_ALL & gVerifyReflowFlags) {
printf(" (all)");
}
if (VERIFY_REFLOW_DUMP_COMMANDS & gVerifyReflowFlags) {
printf(" (show reflow commands)");
}
if (VERIFY_REFLOW_NOISY_RC & gVerifyReflowFlags) {
printf(" (noisy reflow commands)");
if (VERIFY_REFLOW_REALLY_NOISY_RC & gVerifyReflowFlags) {
printf(" (REALLY noisy reflow commands)");
}
}
printf("\n");
}
}
#endif
return gVerifyReflowEnabled;
}
void
nsIPresShell::SetVerifyReflowEnable(bool aEnabled)
{
gVerifyReflowEnabled = aEnabled;
}
void
nsIPresShell::AddAutoWeakFrame(AutoWeakFrame* aWeakFrame)
{
if (aWeakFrame->GetFrame()) {
aWeakFrame->GetFrame()->AddStateBits(NS_FRAME_EXTERNAL_REFERENCE);
}
aWeakFrame->SetPreviousWeakFrame(mAutoWeakFrames);
mAutoWeakFrames = aWeakFrame;
}
void
nsIPresShell::AddWeakFrame(WeakFrame* aWeakFrame)
{
if (aWeakFrame->GetFrame()) {
aWeakFrame->GetFrame()->AddStateBits(NS_FRAME_EXTERNAL_REFERENCE);
}
MOZ_ASSERT(!mWeakFrames.GetEntry(aWeakFrame));
mWeakFrames.PutEntry(aWeakFrame);
}
void
nsIPresShell::RemoveAutoWeakFrame(AutoWeakFrame* aWeakFrame)
{
if (mAutoWeakFrames == aWeakFrame) {
mAutoWeakFrames = aWeakFrame->GetPreviousWeakFrame();
return;
}
AutoWeakFrame* nextWeak = mAutoWeakFrames;
while (nextWeak && nextWeak->GetPreviousWeakFrame() != aWeakFrame) {
nextWeak = nextWeak->GetPreviousWeakFrame();
}
if (nextWeak) {
nextWeak->SetPreviousWeakFrame(aWeakFrame->GetPreviousWeakFrame());
}
}
void
nsIPresShell::RemoveWeakFrame(WeakFrame* aWeakFrame)
{
MOZ_ASSERT(mWeakFrames.GetEntry(aWeakFrame));
mWeakFrames.RemoveEntry(aWeakFrame);
}
already_AddRefed<nsFrameSelection>
nsIPresShell::FrameSelection()
{
RefPtr<nsFrameSelection> ret = mSelection;
return ret.forget();
}
//----------------------------------------------------------------------
static bool sSynthMouseMove = true;
static uint32_t sNextPresShellId;
static bool sAccessibleCaretEnabled = false;
static bool sAccessibleCaretOnTouch = false;
/* static */ bool
PresShell::AccessibleCaretEnabled(nsIDocShell* aDocShell)
{
static bool initialized = false;
if (!initialized) {
Preferences::AddBoolVarCache(&sAccessibleCaretEnabled, "layout.accessiblecaret.enabled");
Preferences::AddBoolVarCache(&sAccessibleCaretOnTouch, "layout.accessiblecaret.enabled_on_touch");
initialized = true;
}
// If the pref forces it on, then enable it.
if (sAccessibleCaretEnabled) {
return true;
}
// If the touch pref is on, and touch events are enabled (this depends
// on the specific device running), then enable it.
if (sAccessibleCaretOnTouch && dom::TouchEvent::PrefEnabled(aDocShell)) {
return true;
}
// Otherwise, disabled.
return false;
}
nsIPresShell::nsIPresShell()
: mFrameConstructor(nullptr)
, mViewManager(nullptr)
, mFrameManager(nullptr)
#ifdef ACCESSIBILITY
, mDocAccessible(nullptr)
#endif
#ifdef DEBUG
, mDrawEventTargetFrame(nullptr)
#endif
, mPaintCount(0)
, mAutoWeakFrames(nullptr)
, mCanvasBackgroundColor(NS_RGBA(0,0,0,0))
, mSelectionFlags(0)
, mChangeNestCount(0)
, mRenderFlags(0)
, mDidInitialize(false)
, mIsDestroying(false)
, mIsReflowing(false)
, mIsObservingDocument(false)
, mIsDocumentGone(false)
, mPaintingSuppressed(false)
, mIsActive(false)
, mFrozen(false)
, mIsFirstPaint(false)
, mObservesMutationsForPrint(false)
, mWasLastReflowInterrupted(false)
, mVisualViewportSizeSet(false)
, mNeedLayoutFlush(true)
, mNeedStyleFlush(true)
, mObservingStyleFlushes(false)
, mObservingLayoutFlushes(false)
, mResizeEventPending(false)
, mNeedThrottledAnimationFlush(true)
, mPresShellId(0)
, mFontSizeInflationEmPerLine(0)
, mFontSizeInflationMinTwips(0)
, mFontSizeInflationLineThreshold(0)
, mFontSizeInflationForceEnabled(false)
, mFontSizeInflationDisabledInMasterProcess(false)
, mFontSizeInflationEnabled(false)
, mPaintingIsFrozen(false)
, mIsNeverPainting(false)
, mInFlush(false)
{}
PresShell::PresShell()
: mCaretEnabled(false)
#ifdef DEBUG
, mInVerifyReflow(false)
, mCurrentReflowRoot(nullptr)
#endif
#ifdef MOZ_REFLOW_PERF
, mReflowCountMgr(nullptr)
#endif
, mMouseLocation(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE)
, mCurrentEventFrame(nullptr)
, mFirstCallbackEventRequest(nullptr)
, mLastCallbackEventRequest(nullptr)
, mLastReflowStart(0.0)
, mLastAnchorScrollPositionY(0)
, mActiveSuppressDisplayport(0)
, mAPZFocusSequenceNumber(0)
, mDocumentLoading(false)
, mIgnoreFrameDestruction(false)
, mHaveShutDown(false)
, mLastRootReflowHadUnconstrainedBSize(false)
, mNoDelayedMouseEvents(false)
, mNoDelayedKeyEvents(false)
, mShouldUnsuppressPainting(false)
, mApproximateFrameVisibilityVisited(false)
, mNextPaintCompressed(false)
, mHasCSSBackgroundColor(false)
, mScaleToResolution(false)
, mIsLastChromeOnlyEscapeKeyConsumed(false)
, mHasReceivedPaintMessage(false)
, mIsLastKeyDownCanceled(false)
, mHasHandledUserInput(false)
#ifdef NIGHTLY_BUILD
, mForceDispatchKeyPressEventsForNonPrintableKeys(false)
, mInitializedForceDispatchKeyPressEventsForNonPrintableKeys(false)
#endif // #ifdef NIGHTLY_BUILD
{
MOZ_LOG(gLog, LogLevel::Debug, ("PresShell::PresShell this=%p", this));
#ifdef MOZ_REFLOW_PERF
mReflowCountMgr = new ReflowCountMgr();
mReflowCountMgr->SetPresContext(mPresContext);
mReflowCountMgr->SetPresShell(this);
#endif
mLastOSWake = mLoadBegin = TimeStamp::Now();
mSelectionFlags = nsISelectionDisplay::DISPLAY_TEXT | nsISelectionDisplay::DISPLAY_IMAGES;
mIsActive = true;
// FIXME/bug 735029: find a better solution to this problem
mIsFirstPaint = true;
mPresShellId = sNextPresShellId++;
mFrozen = false;
mRenderFlags = 0;
mVisualViewportSizeSet = false;
static bool addedSynthMouseMove = false;
if (!addedSynthMouseMove) {
Preferences::AddBoolVarCache(&sSynthMouseMove,
"layout.reflow.synthMouseMove", true);
addedSynthMouseMove = true;
}
PointerEventHandler::Initialize();
mPaintingIsFrozen = false;
mHasCSSBackgroundColor = true;
mIsLastChromeOnlyEscapeKeyConsumed = false;
mHasReceivedPaintMessage = false;
}
NS_IMPL_ISUPPORTS(PresShell, nsIPresShell, nsIDocumentObserver,
nsISelectionController,
nsISelectionDisplay, nsIObserver, nsISupportsWeakReference,
nsIMutationObserver)
PresShell::~PresShell()
{
MOZ_LOG(gLog, LogLevel::Debug, ("PresShell::~PresShell this=%p", this));
if (!mHaveShutDown) {
MOZ_ASSERT_UNREACHABLE("Someone did not call nsIPresShell::destroy");
Destroy();
}
NS_ASSERTION(mCurrentEventContentStack.Count() == 0,
"Huh, event content left on the stack in pres shell dtor!");
NS_ASSERTION(mFirstCallbackEventRequest == nullptr &&
mLastCallbackEventRequest == nullptr,
"post-reflow queues not empty. This means we're leaking");
// Verify that if painting was frozen, but we're being removed from the tree,
// that we now re-enable painting on our refresh driver, since it may need to
// be re-used by another presentation.
if (mPaintingIsFrozen) {
mPresContext->RefreshDriver()->Thaw();
}
MOZ_ASSERT(mAllocatedPointers.IsEmpty(), "Some pres arena objects were not freed");
mStyleSet = nullptr;
delete mFrameConstructor;
mCurrentEventContent = nullptr;
}
/**
* Initialize the presentation shell. Create view manager and style
* manager.
* Note this can't be merged into our constructor because caret initialization
* calls AddRef() on us.
*/
void
PresShell::Init(nsIDocument* aDocument,
nsPresContext* aPresContext,
nsViewManager* aViewManager,
UniquePtr<ServoStyleSet> aStyleSet)
{
MOZ_ASSERT(aDocument, "null ptr");
MOZ_ASSERT(aPresContext, "null ptr");
MOZ_ASSERT(aViewManager, "null ptr");
MOZ_ASSERT(!mDocument, "already initialized");
if (!aDocument || !aPresContext || !aViewManager || mDocument) {
return;
}
mDocument = aDocument;
mViewManager = aViewManager;
// mDocument is now set. It might have a display document whose "need layout/
// style" flush flags are not set, but ours will be set. To keep these
// consistent, call the flag setting functions to propagate those flags up
// to the display document.
SetNeedLayoutFlush();
SetNeedStyleFlush();
// Create our frame constructor.
mFrameConstructor = new nsCSSFrameConstructor(mDocument, this);
mFrameManager = mFrameConstructor;
// The document viewer owns both view manager and pres shell.
mViewManager->SetPresShell(this);
// Bind the context to the presentation shell.
mPresContext = aPresContext;
mPresContext->AttachShell(this);
// Now we can initialize the style set. Make sure to set the member before
// calling Init, since various subroutines need to find the style set off
// the PresContext during initialization.
mStyleSet = std::move(aStyleSet);
mStyleSet->Init(aPresContext);
// Notify our prescontext that it now has a compatibility mode. Note that
// this MUST happen after we set up our style set but before we create any
// frames.
mPresContext->CompatibilityModeChanged();
// Add the preference style sheet.
UpdatePreferenceStyles();
bool accessibleCaretEnabled = AccessibleCaretEnabled(mDocument->GetDocShell());
if (accessibleCaretEnabled) {
// Need to happen before nsFrameSelection has been set up.
mAccessibleCaretEventHub = new AccessibleCaretEventHub(this);
}
mSelection = new nsFrameSelection();
RefPtr<nsFrameSelection> frameSelection = mSelection;
frameSelection->Init(this, nullptr, accessibleCaretEnabled);
// Important: this has to happen after the selection has been set up
#ifdef SHOW_CARET
// make the caret
mCaret = new nsCaret();
mCaret->Init(this);
mOriginalCaret = mCaret;
//SetCaretEnabled(true); // make it show in browser windows
#endif
//set up selection to be displayed in document
// Don't enable selection for print media
nsPresContext::nsPresContextType type = aPresContext->Type();
if (type != nsPresContext::eContext_PrintPreview &&
type != nsPresContext::eContext_Print)
SetDisplaySelection(nsISelectionController::SELECTION_DISABLED);
if (gMaxRCProcessingTime == -1) {
gMaxRCProcessingTime =
Preferences::GetInt("layout.reflow.timeslice", NS_MAX_REFLOW_TIME);
}
if (nsStyleSheetService* ss = nsStyleSheetService::GetInstance()) {
ss->RegisterPresShell(this);
}
{
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os) {
#ifdef MOZ_XUL
os->AddObserver(this, "chrome-flush-skin-caches", false);
#endif
os->AddObserver(this, "memory-pressure", false);
os->AddObserver(this, NS_WIDGET_WAKE_OBSERVER_TOPIC, false);
if (XRE_IsParentProcess() && !sProcessInteractable) {
os->AddObserver(this, "sessionstore-one-or-no-tab-restored", false);
}
os->AddObserver(this, "font-info-updated", false);
}
}
#ifdef MOZ_REFLOW_PERF
if (mReflowCountMgr) {
bool paintFrameCounts =
Preferences::GetBool("layout.reflow.showframecounts");
bool dumpFrameCounts =
Preferences::GetBool("layout.reflow.dumpframecounts");
bool dumpFrameByFrameCounts =
Preferences::GetBool("layout.reflow.dumpframebyframecounts");
mReflowCountMgr->SetDumpFrameCounts(dumpFrameCounts);
mReflowCountMgr->SetDumpFrameByFrameCounts(dumpFrameByFrameCounts);
mReflowCountMgr->SetPaintFrameCounts(paintFrameCounts);
}
#endif
if (mDocument->HasAnimationController()) {
nsSMILAnimationController* animCtrl = mDocument->GetAnimationController();
animCtrl->NotifyRefreshDriverCreated(GetPresContext()->RefreshDriver());
}
for (DocumentTimeline* timeline : mDocument->Timelines()) {
timeline->NotifyRefreshDriverCreated(GetPresContext()->RefreshDriver());
}
// Get our activeness from the docShell.
QueryIsActive();
// Setup our font inflation preferences.
mFontSizeInflationEmPerLine = nsLayoutUtils::FontSizeInflationEmPerLine();
mFontSizeInflationMinTwips = nsLayoutUtils::FontSizeInflationMinTwips();
mFontSizeInflationLineThreshold = nsLayoutUtils::FontSizeInflationLineThreshold();
mFontSizeInflationForceEnabled = nsLayoutUtils::FontSizeInflationForceEnabled();
mFontSizeInflationDisabledInMasterProcess = nsLayoutUtils::FontSizeInflationDisabledInMasterProcess();
// We'll compute the font size inflation state in Initialize(), when we know
// the document type.
mTouchManager.Init(this, mDocument);
if (mPresContext->IsRootContentDocument()) {
mZoomConstraintsClient = new ZoomConstraintsClient();
mZoomConstraintsClient->Init(this, mDocument);
if (gfxPrefs::MetaViewportEnabled() || gfxPrefs::APZAllowZooming()) {
mMobileViewportManager = new MobileViewportManager(this, mDocument);
}
}
}
enum TextPerfLogType {
eLog_reflow,
eLog_loaddone,
eLog_totals
};
static void
LogTextPerfStats(gfxTextPerfMetrics* aTextPerf,
PresShell* aPresShell,
const gfxTextPerfMetrics::TextCounts& aCounts,
float aTime, TextPerfLogType aLogType, const char* aURL)
{
LogModule* tpLog = gfxPlatform::GetLog(eGfxLog_textperf);
// ignore XUL contexts unless at debug level
mozilla::LogLevel logLevel = LogLevel::Warning;
if (aCounts.numContentTextRuns == 0) {
logLevel = LogLevel::Debug;
}
if (!MOZ_LOG_TEST(tpLog, logLevel)) {
return;
}
char prefix[256];
switch (aLogType) {
case eLog_reflow:
SprintfLiteral(prefix, "(textperf-reflow) %p time-ms: %7.0f", aPresShell, aTime);
break;
case eLog_loaddone:
SprintfLiteral(prefix, "(textperf-loaddone) %p time-ms: %7.0f", aPresShell, aTime);
break;
default:
MOZ_ASSERT(aLogType == eLog_totals, "unknown textperf log type");
SprintfLiteral(prefix, "(textperf-totals) %p", aPresShell);
}
double hitRatio = 0.0;
uint32_t lookups = aCounts.wordCacheHit + aCounts.wordCacheMiss;
if (lookups) {
hitRatio = double(aCounts.wordCacheHit) / double(lookups);
}
if (aLogType == eLog_loaddone) {
MOZ_LOG(tpLog, logLevel,
("%s reflow: %d chars: %d "
"[%s] "
"content-textruns: %d chrome-textruns: %d "
"max-textrun-len: %d "
"word-cache-lookups: %d word-cache-hit-ratio: %4.3f "
"word-cache-space: %d word-cache-long: %d "
"pref-fallbacks: %d system-fallbacks: %d "
"textruns-const: %d textruns-destr: %d "
"generic-lookups: %d "
"cumulative-textruns-destr: %d\n",
prefix, aTextPerf->reflowCount, aCounts.numChars,
(aURL ? aURL : ""),
aCounts.numContentTextRuns, aCounts.numChromeTextRuns,
aCounts.maxTextRunLen,
lookups, hitRatio,
aCounts.wordCacheSpaceRules, aCounts.wordCacheLong,
aCounts.fallbackPrefs, aCounts.fallbackSystem,
aCounts.textrunConst, aCounts.textrunDestr,
aCounts.genericLookups,
aTextPerf->cumulative.textrunDestr));
} else {
MOZ_LOG(tpLog, logLevel,
("%s reflow: %d chars: %d "
"content-textruns: %d chrome-textruns: %d "
"max-textrun-len: %d "
"word-cache-lookups: %d word-cache-hit-ratio: %4.3f "
"word-cache-space: %d word-cache-long: %d "
"pref-fallbacks: %d system-fallbacks: %d "
"textruns-const: %d textruns-destr: %d "
"generic-lookups: %d "
"cumulative-textruns-destr: %d\n",
prefix, aTextPerf->reflowCount, aCounts.numChars,
aCounts.numContentTextRuns, aCounts.numChromeTextRuns,
aCounts.maxTextRunLen,
lookups, hitRatio,
aCounts.wordCacheSpaceRules, aCounts.wordCacheLong,
aCounts.fallbackPrefs, aCounts.fallbackSystem,
aCounts.textrunConst, aCounts.textrunDestr,
aCounts.genericLookups,
aTextPerf->cumulative.textrunDestr));
}
}
void
PresShell::Destroy()
{
// Do not add code before this line please!
if (mHaveShutDown) {
return;
}
NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
"destroy called on presshell while scripts not blocked");
// dump out cumulative text perf metrics
gfxTextPerfMetrics* tp;
if (mPresContext && (tp = mPresContext->GetTextPerfMetrics())) {
tp->Accumulate();
if (tp->cumulative.numChars > 0) {
LogTextPerfStats(tp, this, tp->cumulative, 0.0, eLog_totals, nullptr);
}
}
if (mPresContext) {
const bool mayFlushUserFontSet = false;
gfxUserFontSet* fs = mPresContext->GetUserFontSet(mayFlushUserFontSet);
if (fs) {
uint32_t fontCount;
uint64_t fontSize;
fs->GetLoadStatistics(fontCount, fontSize);
Telemetry::Accumulate(Telemetry::WEBFONT_PER_PAGE, fontCount);
Telemetry::Accumulate(Telemetry::WEBFONT_SIZE_PER_PAGE,
uint32_t(fontSize/1024));
} else {
Telemetry::Accumulate(Telemetry::WEBFONT_PER_PAGE, 0);
Telemetry::Accumulate(Telemetry::WEBFONT_SIZE_PER_PAGE, 0);
}
}
#ifdef MOZ_REFLOW_PERF
DumpReflows();
if (mReflowCountMgr) {
delete mReflowCountMgr;
mReflowCountMgr = nullptr;
}
#endif
if (mZoomConstraintsClient) {
mZoomConstraintsClient->Destroy();
mZoomConstraintsClient = nullptr;
}
if (mMobileViewportManager) {
mMobileViewportManager->Destroy();
mMobileViewportManager = nullptr;
}
#ifdef ACCESSIBILITY
if (mDocAccessible) {
#ifdef DEBUG
if (a11y::logging::IsEnabled(a11y::logging::eDocDestroy))
a11y::logging::DocDestroy("presshell destroyed", mDocument);
#endif
mDocAccessible->Shutdown();
mDocAccessible = nullptr;
}
#endif // ACCESSIBILITY
MaybeReleaseCapturingContent();
if (gKeyDownTarget && gKeyDownTarget->OwnerDoc() == mDocument) {
NS_RELEASE(gKeyDownTarget);
}
if (mContentToScrollTo) {
mContentToScrollTo->DeleteProperty(nsGkAtoms::scrolling);
mContentToScrollTo = nullptr;
}
if (mPresContext) {
// We need to notify the destroying the nsPresContext to ESM for
// suppressing to use from ESM.
mPresContext->EventStateManager()->NotifyDestroyPresContext(mPresContext);
}
if (nsStyleSheetService* ss = nsStyleSheetService::GetInstance()) {
ss->UnregisterPresShell(this);
}
{
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os) {
#ifdef MOZ_XUL
os->RemoveObserver(this, "chrome-flush-skin-caches");
#endif
os->RemoveObserver(this, "memory-pressure");
os->RemoveObserver(this, NS_WIDGET_WAKE_OBSERVER_TOPIC);
if (XRE_IsParentProcess()) {
os->RemoveObserver(this, "sessionstore-one-or-no-tab-restored");
}
os->RemoveObserver(this, "font-info-updated");
}
}
// If our paint suppression timer is still active, kill it.
if (mPaintSuppressionTimer) {
mPaintSuppressionTimer->Cancel();
mPaintSuppressionTimer = nullptr;
}
// Same for our reflow continuation timer
if (mReflowContinueTimer) {
mReflowContinueTimer->Cancel();
mReflowContinueTimer = nullptr;
}
if (mDelayedPaintTimer) {
mDelayedPaintTimer->Cancel();
mDelayedPaintTimer = nullptr;
}
mSynthMouseMoveEvent.Revoke();
mUpdateApproximateFrameVisibilityEvent.Revoke();
ClearApproximatelyVisibleFramesList(Some(OnNonvisible::DISCARD_IMAGES));
if (mCaret) {
mCaret->Terminate();
mCaret = nullptr;
}
if (mSelection) {
RefPtr<nsFrameSelection> frameSelection = mSelection;
frameSelection->DisconnectFromPresShell();
}
if (mAccessibleCaretEventHub) {
mAccessibleCaretEventHub->Terminate();
mAccessibleCaretEventHub = nullptr;
}
// release our pref style sheet, if we have one still
//
// FIXME(emilio): Why do we need to do this? The stylist is getting nixed with
// us anyway.
RemovePreferenceStyles();
mIsDestroying = true;
// We can't release all the event content in
// mCurrentEventContentStack here since there might be code on the
// stack that will release the event content too. Double release
// bad!
// The frames will be torn down, so remove them from the current
// event frame stack (since they'd be dangling references if we'd
// leave them in) and null out the mCurrentEventFrame pointer as
// well.
mCurrentEventFrame = nullptr;
int32_t i, count = mCurrentEventFrameStack.Length();
for (i = 0; i < count; i++) {
mCurrentEventFrameStack[i] = nullptr;
}
mFramesToDirty.Clear();
if (mViewManager) {
// Clear the view manager's weak pointer back to |this| in case it
// was leaked.
mViewManager->SetPresShell(nullptr);
mViewManager = nullptr;
}
// mFrameArena will be destroyed soon. Clear out any ArenaRefPtrs
// pointing to objects in the arena now. This is done:
//
// (a) before mFrameArena's destructor runs so that our
// mAllocatedPointers becomes empty and doesn't trip the assertion
// in ~PresShell,
// (b) before the mPresContext->DetachShell() below, so
// that when we clear the ArenaRefPtrs they'll still be able to
// get back to this PresShell to deregister themselves (e.g. note
// how ComputedStyle::Arena returns the PresShell got from its
// rule node's nsPresContext, which would return null if we'd already
// called mPresContext->DetachShell()), and
// (c) before the mStyleSet->BeginShutdown() call just below, so that
// the ComputedStyles don't complain they're being destroyed later
// than the rule tree is.
mFrameArena.ClearArenaRefPtrs();
mStyleSet->BeginShutdown();
nsRefreshDriver* rd = GetPresContext()->RefreshDriver();
// This shell must be removed from the document before the frame
// hierarchy is torn down to avoid finding deleted frames through
// this presshell while the frames are being torn down
if (mDocument) {
NS_ASSERTION(mDocument->GetShell() == this, "Wrong shell?");
mDocument->ClearServoRestyleRoot();
mDocument->DeleteShell();
if (mDocument->HasAnimationController()) {
mDocument->GetAnimationController()->NotifyRefreshDriverDestroying(rd);
}
for (DocumentTimeline* timeline : mDocument->Timelines()) {
timeline->NotifyRefreshDriverDestroying(rd);
}
}
if (mPresContext) {
rd->CancelPendingAnimationEvents(mPresContext->AnimationEventDispatcher());
}
// Revoke any pending events. We need to do this and cancel pending reflows
// before we destroy the frame manager, since apparently frame destruction
// sometimes spins the event queue when plug-ins are involved(!).
StopObservingRefreshDriver();
if (rd->GetPresContext() == GetPresContext()) {
rd->RevokeViewManagerFlush();
}
CancelAllPendingReflows();
CancelPostedReflowCallbacks();
// Destroy the frame manager. This will destroy the frame hierarchy
mFrameConstructor->WillDestroyFrameTree();
NS_WARNING_ASSERTION(!mAutoWeakFrames && mWeakFrames.IsEmpty(),
"Weak frames alive after destroying FrameManager");
while (mAutoWeakFrames) {
mAutoWeakFrames->Clear(this);
}
nsTArray<WeakFrame*> toRemove(mWeakFrames.Count());
for (auto iter = mWeakFrames.Iter(); !iter.Done(); iter.Next()) {
toRemove.AppendElement(iter.Get()->GetKey());
}
for (WeakFrame* weakFrame : toRemove) {
weakFrame->Clear(this);
}
// Let the style set do its cleanup.
mStyleSet->Shutdown();
if (mPresContext) {
// We hold a reference to the pres context, and it holds a weak link back
// to us. To avoid the pres context having a dangling reference, set its
// pres shell to nullptr
mPresContext->DetachShell();
// Clear the link handler (weak reference) as well
mPresContext->SetLinkHandler(nullptr);
}
mHaveShutDown = true;
mTouchManager.Destroy();
}
void
nsIPresShell::StopObservingRefreshDriver()
{
nsRefreshDriver* rd = mPresContext->RefreshDriver();
if (mResizeEventPending) {
rd->RemoveResizeEventFlushObserver(this);
}
if (mObservingLayoutFlushes) {
rd->RemoveLayoutFlushObserver(this);
}
if (mObservingStyleFlushes) {
rd->RemoveStyleFlushObserver(this);
}
}
void
nsIPresShell::StartObservingRefreshDriver()
{
nsRefreshDriver* rd = mPresContext->RefreshDriver();
if (mResizeEventPending) {
rd->AddResizeEventFlushObserver(this);
}
if (mObservingLayoutFlushes) {
rd->AddLayoutFlushObserver(this);
}
if (mObservingStyleFlushes) {
rd->AddStyleFlushObserver(this);
}
}
nsRefreshDriver*
nsIPresShell::GetRefreshDriver() const
{
return mPresContext ? mPresContext->RefreshDriver() : nullptr;
}
void
nsIPresShell::SetAuthorStyleDisabled(bool aStyleDisabled)
{
if (aStyleDisabled != mStyleSet->GetAuthorStyleDisabled()) {
mStyleSet->SetAuthorStyleDisabled(aStyleDisabled);
ApplicableStylesChanged();
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
observerService->NotifyObservers(mDocument,
"author-style-disabled-changed",
nullptr);
}
}
}
bool
nsIPresShell::GetAuthorStyleDisabled() const
{
return mStyleSet->GetAuthorStyleDisabled();
}
void
PresShell::UpdatePreferenceStyles()
{
if (!mDocument) {
return;
}
// If the document doesn't have a window there's no need to notify
// its presshell about changes to preferences since the document is
// in a state where it doesn't matter any more (see
// nsDocumentViewer::Close()).
if (!mDocument->GetWindow()) {
return;
}
// Documents in chrome shells do not have any preference style rules applied.
if (nsContentUtils::IsInChromeDocshell(mDocument)) {
return;
}
// We need to pass in mPresContext so that if the nsLayoutStylesheetCache
// needs to recreate the pref style sheet, it has somewhere to get the
// pref styling information from. All pres contexts for
// IsChromeOriginImage() == false will have the same pref styling information,
// and similarly for IsChromeOriginImage() == true, so it doesn't really
// matter which pres context we pass in when it does need to be recreated.
// (See nsPresContext::GetDocumentColorPreferences for how whether we
// are a chrome origin image affects some pref styling information.)
auto cache = nsLayoutStylesheetCache::Singleton();
RefPtr<StyleSheet> newPrefSheet =
mPresContext->IsChromeOriginImage() ?
cache->ChromePreferenceSheet(mPresContext) :
cache->ContentPreferenceSheet(mPresContext);
if (mPrefStyleSheet == newPrefSheet) {
return;
}
RemovePreferenceStyles();
// NOTE(emilio): This sheet is added as an agent sheet, because we don't want
// it to be modifiable from devtools and similar, see bugs 1239336 and
// 1436782. I think it conceptually should be a user sheet, and could be
// without too much trouble I'd think.
mStyleSet->AppendStyleSheet(SheetType::Agent, newPrefSheet);
mPrefStyleSheet = newPrefSheet;
}
void
PresShell::RemovePreferenceStyles()
{
if (mPrefStyleSheet) {
mStyleSet->RemoveStyleSheet(SheetType::Agent, mPrefStyleSheet);
mPrefStyleSheet = nullptr;
}
}
void
PresShell::AddUserSheet(StyleSheet* aSheet)
{
// Make sure this does what nsDocumentViewer::CreateStyleSet does wrt
// ordering. We want this new sheet to come after all the existing stylesheet
// service sheets, but before other user sheets; see nsIStyleSheetService.idl
// for the ordering. Just remove and readd all the nsStyleSheetService
// sheets.
nsCOMPtr<nsIStyleSheetService> dummy =
do_GetService(NS_STYLESHEETSERVICE_CONTRACTID);
nsStyleSheetService* sheetService = nsStyleSheetService::gInstance;
nsTArray<RefPtr<StyleSheet>>& userSheets = *sheetService->UserStyleSheets();
// Iterate forwards when removing so the searches for RemoveStyleSheet are as
// short as possible.
for (StyleSheet* sheet : userSheets) {
mStyleSet->RemoveStyleSheet(SheetType::User, sheet);
}
// Now iterate backwards, so that the order of userSheets will be the same as
// the order of sheets from it in the style set.
for (StyleSheet* sheet : Reversed(userSheets)) {
mStyleSet->PrependStyleSheet(SheetType::User, sheet);
}
ApplicableStylesChanged();
}
void
PresShell::AddAgentSheet(StyleSheet* aSheet)
{
// Make sure this does what nsDocumentViewer::CreateStyleSet does
// wrt ordering.
mStyleSet->AppendStyleSheet(SheetType::Agent, aSheet);
ApplicableStylesChanged();
}
void
PresShell::AddAuthorSheet(StyleSheet* aSheet)
{
// Document specific "additional" Author sheets should be stronger than the
// ones added with the StyleSheetService.
StyleSheet* firstAuthorSheet =
mDocument->GetFirstAdditionalAuthorSheet();
if (firstAuthorSheet) {
mStyleSet->InsertStyleSheetBefore(SheetType::Doc, aSheet,
firstAuthorSheet);
} else {
mStyleSet->AppendStyleSheet(SheetType::Doc, aSheet);
}
ApplicableStylesChanged();
}
void
PresShell::RemoveSheet(SheetType aType, StyleSheet* aSheet)
{
mStyleSet->RemoveStyleSheet(aType, aSheet);
ApplicableStylesChanged();
}
NS_IMETHODIMP
PresShell::SetDisplaySelection(int16_t aToggle)
{
RefPtr<nsFrameSelection> frameSelection = mSelection;
frameSelection->SetDisplaySelection(aToggle);
return NS_OK;
}
NS_IMETHODIMP
PresShell::GetDisplaySelection(int16_t *aToggle)
{
RefPtr<nsFrameSelection> frameSelection = mSelection;
*aToggle = frameSelection->GetDisplaySelection();
return NS_OK;
}
NS_IMETHODIMP
PresShell::GetSelectionFromScript(RawSelectionType aRawSelectionType,
Selection **aSelection)
{
if (!aSelection || !mSelection)
return NS_ERROR_NULL_POINTER;
RefPtr<nsFrameSelection> frameSelection = mSelection;
RefPtr<Selection> selection =
frameSelection->GetSelection(ToSelectionType(aRawSelectionType));
if (!selection) {
return NS_ERROR_INVALID_ARG;
}
selection.forget(aSelection);
return NS_OK;
}
Selection*
PresShell::GetSelection(RawSelectionType aRawSelectionType)
{
if (!mSelection) {
return nullptr;
}
RefPtr<nsFrameSelection> frameSelection = mSelection;
return frameSelection->GetSelection(ToSelectionType(aRawSelectionType));
}
Selection*
PresShell::GetCurrentSelection(SelectionType aSelectionType)
{
if (!mSelection)
return nullptr;
RefPtr<nsFrameSelection> frameSelection = mSelection;
return frameSelection->GetSelection(aSelectionType);
}
already_AddRefed<nsISelectionController>
PresShell::GetSelectionControllerForFocusedContent(nsIContent** aFocusedContent)
{
if (aFocusedContent) {
*aFocusedContent = nullptr;
}
if (mDocument) {
nsCOMPtr<nsPIDOMWindowOuter> focusedWindow;
nsCOMPtr<nsIContent> focusedContent =
nsFocusManager::GetFocusedDescendant(mDocument->GetWindow(),
nsFocusManager::eOnlyCurrentWindow,
getter_AddRefs(focusedWindow));
if (focusedContent) {
nsIFrame* frame = focusedContent->GetPrimaryFrame();
if (frame) {
nsCOMPtr<nsISelectionController> selectionController;
frame->GetSelectionController(mPresContext,
getter_AddRefs(selectionController));
if (selectionController) {
if (aFocusedContent) {
focusedContent.forget(aFocusedContent);
}
return selectionController.forget();
}
}
}
}
nsCOMPtr<nsISelectionController> self(this);
return self.forget();
}
NS_IMETHODIMP
PresShell::ScrollSelectionIntoView(RawSelectionType aRawSelectionType,
SelectionRegion aRegion,
int16_t aFlags)
{
if (!mSelection)
return NS_ERROR_NULL_POINTER;
RefPtr<nsFrameSelection> frameSelection = mSelection;
return frameSelection->ScrollSelectionIntoView(
ToSelectionType(aRawSelectionType), aRegion, aFlags);
}
NS_IMETHODIMP
PresShell::RepaintSelection(RawSelectionType aRawSelectionType)
{
if (!mSelection) {
return NS_ERROR_NULL_POINTER;
}
if (MOZ_UNLIKELY(mIsDestroying)) {
return NS_OK;
}
RefPtr<nsFrameSelection> frameSelection = mSelection;
return frameSelection->RepaintSelection(ToSelectionType(aRawSelectionType));
}
// Make shell be a document observer
void
nsIPresShell::BeginObservingDocument()
{
if (mDocument && !mIsDestroying) {
mIsObservingDocument = true;
if (mIsDocumentGone) {
NS_WARNING("Adding a presshell that was disconnected from the document "
"as a document observer? Sounds wrong...");
mIsDocumentGone = false;
}
}
}
// Make shell stop being a document observer
void
nsIPresShell::EndObservingDocument()
{
// XXXbz do we need to tell the frame constructor that the document
// is gone, perhaps? Except for printing it's NOT gone, sometimes.
mIsDocumentGone = true;
mIsObservingDocument = false;
}
#ifdef DEBUG_kipp
char* nsPresShell_ReflowStackPointerTop;
#endif
class XBLConstructorRunner : public Runnable
{
public:
explicit XBLConstructorRunner(nsIDocument* aDocument)
: Runnable("XBLConstructorRunner")
, mDocument(aDocument)
{
}
NS_IMETHOD Run() override
{
mDocument->BindingManager()->ProcessAttachedQueue();
return NS_OK;
}
private:
nsCOMPtr<nsIDocument> mDocument;
};
nsresult
PresShell::Initialize()
{
if (mIsDestroying) {
return NS_OK;
}
if (!mDocument) {
// Nothing to do
return NS_OK;
}
MOZ_LOG(gLog, LogLevel::Debug, ("PresShell::Initialize this=%p", this));
NS_ASSERTION(!mDidInitialize, "Why are we being called?");
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
RecomputeFontSizeInflationEnabled();
MOZ_DIAGNOSTIC_ASSERT(!mIsDestroying);
// Ensure the pres context doesn't think it has changed, since we haven't even
// started layout. This avoids spurious restyles / reflows afterwards.
//
// Note that this is very intentionally before setting mDidInitialize so it
// doesn't notify the document, or run media query change events.
mPresContext->FlushPendingMediaFeatureValuesChanged();
MOZ_DIAGNOSTIC_ASSERT(!mIsDestroying);
mDidInitialize = true;
#ifdef DEBUG
if (VERIFY_REFLOW_NOISY_RC & gVerifyReflowFlags) {
if (mDocument) {
nsIURI *uri = mDocument->GetDocumentURI();
if (uri) {
printf("*** PresShell::Initialize (this=%p, url='%s')\n",
(void*)this, uri->GetSpecOrDefault().get());
}
}
}
#endif
// Get the root frame from the frame manager
// XXXbz it would be nice to move this somewhere else... like frame manager
// Init(), say. But we need to make sure our views are all set up by the
// time we do this!
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
NS_ASSERTION(!rootFrame, "How did that happen, exactly?");
if (!rootFrame) {
nsAutoScriptBlocker scriptBlocker;
rootFrame = mFrameConstructor->ConstructRootFrame();
mFrameConstructor->SetRootFrame(rootFrame);
}
NS_ENSURE_STATE(!mHaveShutDown);
if (!rootFrame) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (Element* root = mDocument->GetRootElement()) {
{
nsAutoCauseReflowNotifier reflowNotifier(this);
// Have the style sheet processor construct frame for the root
// content object down
mFrameConstructor->ContentInserted(
root, nullptr, nsCSSFrameConstructor::InsertionKind::Sync);
// Something in mFrameConstructor->ContentInserted may have caused
// Destroy() to get called, bug 337586.
NS_ENSURE_STATE(!mHaveShutDown);
}
// nsAutoCauseReflowNotifier (which sets up a script blocker) going out of
// scope may have killed us too
NS_ENSURE_STATE(!mHaveShutDown);
// Run the XBL binding constructors for any new frames we've constructed.
// (Do this in a script runner, since our caller might have a script
// blocker on the stack.)
nsContentUtils::AddScriptRunner(new XBLConstructorRunner(mDocument));
// XBLConstructorRunner might destroy us.
NS_ENSURE_STATE(!mHaveShutDown);
}
mDocument->TriggerAutoFocus();
NS_ASSERTION(rootFrame, "How did that happen?");
// Note: when the frame was created above it had the NS_FRAME_IS_DIRTY bit
// set, but XBL processing could have caused a reflow which clears it.
if (MOZ_LIKELY(rootFrame->GetStateBits() & NS_FRAME_IS_DIRTY)) {
// Unset the DIRTY bits so that FrameNeedsReflow() will work right.
rootFrame->RemoveStateBits(NS_FRAME_IS_DIRTY |
NS_FRAME_HAS_DIRTY_CHILDREN);
NS_ASSERTION(!mDirtyRoots.Contains(rootFrame),
"Why is the root in mDirtyRoots already?");
FrameNeedsReflow(rootFrame, nsIPresShell::eResize, NS_FRAME_IS_DIRTY);
NS_ASSERTION(mDirtyRoots.Contains(rootFrame),
"Should be in mDirtyRoots now");
NS_ASSERTION(mObservingLayoutFlushes, "Why no reflow scheduled?");
}
// Restore our root scroll position now if we're getting here after EndLoad
// got called, since this is our one chance to do it. Note that we need not
// have reflowed for this to work; when the scrollframe is finally reflowed
// it'll pick up the position we store in it here.
if (!mDocumentLoading) {
RestoreRootScrollPosition();
}
// For printing, we just immediately unsuppress.
if (!mPresContext->IsPaginated()) {
// Kick off a one-shot timer based off our pref value. When this timer
// fires, if painting is still locked down, then we will go ahead and
// trigger a full invalidate and allow painting to proceed normally.
mPaintingSuppressed = true;
// Don't suppress painting if the document isn't loading.
nsIDocument::ReadyState readyState = mDocument->GetReadyStateEnum();
if (readyState != nsIDocument::READYSTATE_COMPLETE) {
mPaintSuppressionTimer = NS_NewTimer();
}
if (!mPaintSuppressionTimer) {
mPaintingSuppressed = false;
} else {
// Initialize the timer.
// Default to PAINTLOCK_EVENT_DELAY if we can't get the pref value.
int32_t delay =
Preferences::GetInt("nglayout.initialpaint.delay",
PAINTLOCK_EVENT_DELAY);
mPaintSuppressionTimer->SetTarget(
mDocument->EventTargetFor(TaskCategory::Other));
mPaintSuppressionTimer->InitWithNamedFuncCallback(
sPaintSuppressionCallback, this, delay, nsITimer::TYPE_ONE_SHOT,
"PresShell::sPaintSuppressionCallback");
}
}
// If we get here and painting is not suppressed, then we can paint anytime
// and we should fire the before-first-paint notification
if (!mPaintingSuppressed) {
ScheduleBeforeFirstPaint();
}
return NS_OK; //XXX this needs to be real. MMP
}
void
PresShell::sPaintSuppressionCallback(nsITimer *aTimer, void* aPresShell)
{
RefPtr<PresShell> self = static_cast<PresShell*>(aPresShell);
if (self)
self->UnsuppressPainting();
}
nsresult
PresShell::ResizeReflow(nscoord aWidth, nscoord aHeight, nscoord aOldWidth,
nscoord aOldHeight, ResizeReflowOptions aOptions)
{
if (mZoomConstraintsClient) {
// If we have a ZoomConstraintsClient and the available screen area
// changed, then we might need to disable double-tap-to-zoom, so notify
// the ZCC to update itself.
mZoomConstraintsClient->ScreenSizeChanged();
}
if (mMobileViewportManager) {
// If we have a mobile viewport manager, request a reflow from it. It can
// recompute the final CSS viewport and trigger a call to
// ResizeReflowIgnoreOverride if it changed.
mMobileViewportManager->RequestReflow();
return NS_OK;
}
return ResizeReflowIgnoreOverride(aWidth, aHeight, aOldWidth,
aOldHeight, aOptions);
}
nsresult
PresShell::ResizeReflowIgnoreOverride(nscoord aWidth, nscoord aHeight,
nscoord aOldWidth, nscoord aOldHeight,
ResizeReflowOptions aOptions)
{
MOZ_ASSERT(!mIsReflowing, "Shouldn't be in reflow here!");
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (!rootFrame) {
// If we don't have a root frame yet, that means we haven't had our initial
// reflow... If that's the case, and aWidth or aHeight is unconstrained,
// ignore them altogether.
if (aHeight == NS_UNCONSTRAINEDSIZE || aWidth == NS_UNCONSTRAINEDSIZE) {
// We can't do the work needed for SizeToContent without a root
// frame, and we want to return before setting the visible area.
return NS_ERROR_NOT_AVAILABLE;
}
mPresContext->SetVisibleArea(nsRect(0, 0, aWidth, aHeight));
// There isn't anything useful we can do if the initial reflow hasn't
// happened.
return NS_OK;
}
WritingMode wm = rootFrame->GetWritingMode();
const bool shrinkToFit = aOptions == ResizeReflowOptions::eBSizeLimit;
MOZ_ASSERT(shrinkToFit ||
(wm.IsVertical() ? aWidth : aHeight) != NS_UNCONSTRAINEDSIZE,
"unconstrained bsize only usable with eBSizeLimit");
MOZ_ASSERT((wm.IsVertical() ? aHeight : aWidth) != NS_UNCONSTRAINEDSIZE,
"unconstrained isize not allowed");
bool isBSizeChanging = wm.IsVertical() ? aOldWidth != aWidth
: aOldHeight != aHeight;
nscoord targetWidth = aWidth;
nscoord targetHeight = aHeight;
if (shrinkToFit) {
if (wm.IsVertical()) {
targetWidth = NS_UNCONSTRAINEDSIZE;
} else {
targetHeight = NS_UNCONSTRAINEDSIZE;
}
isBSizeChanging = true;
}
const bool suppressingResizeReflow =
GetPresContext()->SuppressingResizeReflow();
RefPtr<nsViewManager> viewManager = mViewManager;
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
if (!suppressingResizeReflow && shrinkToFit) {
// Make sure that style is flushed before setting the pres context
// VisibleArea if we're shrinking to fit.
//
// Otherwise we may end up with bogus viewport units resolved against the
// unconstrained bsize, or restyling the whole document resolving viewport
// units against targetWidth, which may end up doing wasteful work.
mDocument->FlushPendingNotifications(FlushType::Frames);
}
if (!mIsDestroying) {
mPresContext->SetVisibleArea(nsRect(0, 0, targetWidth, targetHeight));
}
if (!mIsDestroying && !suppressingResizeReflow) {
if (!shrinkToFit) {
// Flush styles _now_ (with the correct visible area) if not computing the
// shrink-to-fit size.
//
// We've asserted above that sizes are not unconstrained, so this is going
// to be the final size, which means that we'll get the (correct) final
// styles now, and avoid a further potentially-wasteful full recascade on
// the next flush.
mDocument->FlushPendingNotifications(FlushType::Frames);
}
rootFrame = mFrameConstructor->GetRootFrame();
if (!mIsDestroying && rootFrame) {
// XXX Do a full invalidate at the beginning so that invalidates along
// the way don't have region accumulation issues?
if (isBSizeChanging) {
// For BSize changes driven by style, RestyleManager handles this.
// For height:auto BSizes (i.e. layout-controlled), descendant
// intrinsic sizes can't depend on them. So the only other case is
// viewport-controlled BSizes which we handle here.
nsLayoutUtils::MarkIntrinsicISizesDirtyIfDependentOnBSize(rootFrame);
}
{
nsAutoCauseReflowNotifier crNotifier(this);
WillDoReflow();
// Kick off a top-down reflow
AUTO_LAYOUT_PHASE_ENTRY_POINT(GetPresContext(), Reflow);
nsViewManager::AutoDisableRefresh refreshBlocker(viewManager);
mDirtyRoots.RemoveElement(rootFrame);
DoReflow(rootFrame, true);
if (shrinkToFit) {
const bool reflowAgain = wm.IsVertical() ?
mPresContext->GetVisibleArea().width > aWidth :
mPresContext->GetVisibleArea().height > aHeight;
if (reflowAgain) {
mPresContext->SetVisibleArea(nsRect(0, 0, aWidth, aHeight));
DoReflow(rootFrame, true);
}
}
}
// the first DoReflow above should've set our bsize if it was
// NS_UNCONSTRAINEDSIZE, and the isize shouldn't be NS_UNCONSTRAINEDSIZE
// anyway
NS_ASSERTION(
mPresContext->GetVisibleArea().width != NS_UNCONSTRAINEDSIZE,
"width should not be NS_UNCONSTRAINEDSIZE after reflow");
NS_ASSERTION(
mPresContext->GetVisibleArea().height != NS_UNCONSTRAINEDSIZE,
"height should not be NS_UNCONSTRAINEDSIZE after reflow");
DidDoReflow(true);
}
}
rootFrame = mFrameConstructor->GetRootFrame();
if (rootFrame) {
wm = rootFrame->GetWritingMode();
// reflow did not happen; if the reflow happened, our bsize should not be
// NS_UNCONSTRAINEDSIZE because DoReflow will fix it up to the same values
// as below
if (wm.IsVertical()) {
if (mPresContext->GetVisibleArea().width == NS_UNCONSTRAINEDSIZE) {
mPresContext->SetVisibleArea(
nsRect(0, 0, rootFrame->GetRect().width, aHeight));
}
} else {
if (mPresContext->GetVisibleArea().height == NS_UNCONSTRAINEDSIZE) {
mPresContext->SetVisibleArea(
nsRect(0, 0, aWidth, rootFrame->GetRect().height));
}
}
}
if (!mIsDestroying && !mResizeEventPending) {
mResizeEventPending = true;
if (MOZ_LIKELY(!mDocument->GetBFCacheEntry())) {
mPresContext->RefreshDriver()->AddResizeEventFlushObserver(this);
}
}
return NS_OK; //XXX this needs to be real. MMP
}
void
PresShell::FireResizeEvent()
{
if (mIsDocumentGone) {
return;
}
mResizeEventPending = false;
//Send resize event from here.
WidgetEvent event(true, mozilla::eResize);
nsEventStatus status = nsEventStatus_eIgnore;
if (nsPIDOMWindowOuter* window = mDocument->GetWindow()) {
EventDispatcher::Dispatch(window, mPresContext, &event, nullptr, &status);
}
}
void
PresShell::SetIgnoreFrameDestruction(bool aIgnore)
{
if (mDocument) {
// We need to tell the ImageLoader to drop all its references to frames
// because they're about to go away and it won't get notifications of that.
mDocument->StyleImageLoader()->ClearFrames(mPresContext);
}
mIgnoreFrameDestruction = aIgnore;
}
void
PresShell::NotifyDestroyingFrame(nsIFrame* aFrame)
{
// We must remove these from FrameLayerBuilder::DisplayItemData::mFrameList here,
// otherwise the DisplayItemData destructor will use the destroyed frame when it
// tries to remove it from the (array) value of this property.
aFrame->RemoveDisplayItemDataForDeletion();
if (!mIgnoreFrameDestruction) {
if (aFrame->HasImageRequest()) {
mDocument->StyleImageLoader()->DropRequestsForFrame(aFrame);
}
mFrameConstructor->NotifyDestroyingFrame(aFrame);
for (int32_t idx = mDirtyRoots.Length(); idx; ) {
--idx;
if (mDirtyRoots[idx] == aFrame) {
mDirtyRoots.RemoveElementAt(idx);
}
}
// Remove frame properties
aFrame->DeleteAllProperties();
if (aFrame == mCurrentEventFrame) {
mCurrentEventContent = aFrame->GetContent();
mCurrentEventFrame = nullptr;
}
#ifdef DEBUG
if (aFrame == mDrawEventTargetFrame) {
mDrawEventTargetFrame = nullptr;
}
#endif
for (unsigned int i=0; i < mCurrentEventFrameStack.Length(); i++) {
if (aFrame == mCurrentEventFrameStack.ElementAt(i)) {
//One of our stack frames was deleted. Get its content so that when we
//pop it we can still get its new frame from its content
nsIContent *currentEventContent = aFrame->GetContent();
mCurrentEventContentStack.ReplaceObjectAt(currentEventContent, i);
mCurrentEventFrameStack[i] = nullptr;
}
}
mFramesToDirty.RemoveEntry(aFrame);
}
}
already_AddRefed<nsCaret> PresShell::GetCaret() const
{
RefPtr<nsCaret> caret = mCaret;
return caret.forget();
}
already_AddRefed<AccessibleCaretEventHub> PresShell::GetAccessibleCaretEventHub() const
{
RefPtr<AccessibleCaretEventHub> eventHub = mAccessibleCaretEventHub;
return eventHub.forget();
}
void PresShell::SetCaret(nsCaret *aNewCaret)
{
mCaret = aNewCaret;
}
void PresShell::RestoreCaret()
{
mCaret = mOriginalCaret;
}
NS_IMETHODIMP PresShell::SetCaretEnabled(bool aInEnable)
{
bool oldEnabled = mCaretEnabled;
mCaretEnabled = aInEnable;
if (mCaretEnabled != oldEnabled)
{
MOZ_ASSERT(mCaret);
if (mCaret) {
mCaret->SetVisible(mCaretEnabled);
}
}
return NS_OK;
}
NS_IMETHODIMP PresShell::SetCaretReadOnly(bool aReadOnly)
{
if (mCaret)
mCaret->SetCaretReadOnly(aReadOnly);
return NS_OK;
}
NS_IMETHODIMP PresShell::GetCaretEnabled(bool *aOutEnabled)
{
NS_ENSURE_ARG_POINTER(aOutEnabled);
*aOutEnabled = mCaretEnabled;
return NS_OK;
}
NS_IMETHODIMP PresShell::SetCaretVisibilityDuringSelection(bool aVisibility)
{
if (mCaret)
mCaret->SetVisibilityDuringSelection(aVisibility);
return NS_OK;
}
NS_IMETHODIMP PresShell::GetCaretVisible(bool *aOutIsVisible)
{
*aOutIsVisible = false;
if (mCaret) {
*aOutIsVisible = mCaret->IsVisible();
}
return NS_OK;
}
NS_IMETHODIMP PresShell::SetSelectionFlags(int16_t aInEnable)
{
mSelectionFlags = aInEnable;
return NS_OK;
}
NS_IMETHODIMP PresShell::GetSelectionFlags(int16_t *aOutEnable)
{
if (!aOutEnable)
return NS_ERROR_INVALID_ARG;
*aOutEnable = mSelectionFlags;
return NS_OK;
}
//implementation of nsISelectionController
NS_IMETHODIMP
PresShell::PhysicalMove(int16_t aDirection, int16_t aAmount, bool aExtend)
{
RefPtr<nsFrameSelection> frameSelection = mSelection;
return frameSelection->PhysicalMove(aDirection, aAmount, aExtend);
}
NS_IMETHODIMP
PresShell::CharacterMove(bool aForward, bool aExtend)
{
RefPtr<nsFrameSelection> frameSelection = mSelection;
return frameSelection->CharacterMove(aForward, aExtend);
}
NS_IMETHODIMP
PresShell::CharacterExtendForDelete()
{
RefPtr<nsFrameSelection> frameSelection = mSelection;
return frameSelection->CharacterExtendForDelete();
}
NS_IMETHODIMP
PresShell::CharacterExtendForBackspace()
{
RefPtr<nsFrameSelection> frameSelection = mSelection;
return frameSelection->CharacterExtendForBackspace();
}
NS_IMETHODIMP
PresShell::WordMove(bool aForward, bool aExtend)
{
RefPtr<nsFrameSelection> frameSelection = mSelection;
nsresult result = frameSelection->WordMove(aForward, aExtend);
// if we can't go down/up any more we must then move caret completely to
// end/beginning respectively.
if (NS_FAILED(result))
result = CompleteMove(aForward, aExtend);
return result;
}
NS_IMETHODIMP
PresShell::WordExtendForDelete(bool aForward)
{
RefPtr<nsFrameSelection> frameSelection = mSelection;
return frameSelection->WordExtendForDelete(aForward);
}
NS_IMETHODIMP
PresShell::LineMove(bool aForward, bool aExtend)
{
RefPtr<nsFrameSelection> frameSelection = mSelection;
nsresult result = frameSelection->LineMove(aForward, aExtend);
// if we can't go down/up any more we must then move caret completely to
// end/beginning respectively.
if (NS_FAILED(result))
result = CompleteMove(aForward,aExtend);
return result;
}
NS_IMETHODIMP
PresShell::IntraLineMove(bool aForward, bool aExtend)
{
RefPtr<nsFrameSelection> frameSelection = mSelection;
return frameSelection->IntraLineMove(aForward, aExtend);
}
NS_IMETHODIMP
PresShell::PageMove(bool aForward, bool aExtend)
{
nsIScrollableFrame *scrollableFrame =
GetScrollableFrameToScroll(nsIPresShell::eVertical);
if (!scrollableFrame)
return NS_OK;
RefPtr<nsFrameSelection> frameSelection = mSelection;
frameSelection->CommonPageMove(aForward, aExtend, scrollableFrame);
// After ScrollSelectionIntoView(), the pending notifications might be
// flushed and PresShell/PresContext/Frames may be dead. See bug 418470.
return ScrollSelectionIntoView(nsISelectionController::SELECTION_NORMAL,
nsISelectionController::SELECTION_FOCUS_REGION,
nsISelectionController::SCROLL_SYNCHRONOUS |
nsISelectionController::SCROLL_FOR_CARET_MOVE);
}
NS_IMETHODIMP
PresShell::ScrollPage(bool aForward)
{
nsIScrollableFrame* scrollFrame =
GetScrollableFrameToScroll(nsIPresShell::eVertical);
if (scrollFrame) {
scrollFrame->ScrollBy(nsIntPoint(0, aForward ? 1 : -1),
nsIScrollableFrame::PAGES,
nsIScrollableFrame::SMOOTH,
nullptr, nullptr,
nsIScrollableFrame::NOT_MOMENTUM,
nsIScrollableFrame::ENABLE_SNAP);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::ScrollLine(bool aForward)
{
nsIScrollableFrame* scrollFrame =
GetScrollableFrameToScroll(nsIPresShell::eVertical);
if (scrollFrame) {
int32_t lineCount = Preferences::GetInt("toolkit.scrollbox.verticalScrollDistance",
NS_DEFAULT_VERTICAL_SCROLL_DISTANCE);
scrollFrame->ScrollBy(nsIntPoint(0, aForward ? lineCount : -lineCount),
nsIScrollableFrame::LINES,
nsIScrollableFrame::SMOOTH,
nullptr, nullptr,
nsIScrollableFrame::NOT_MOMENTUM,
nsIScrollableFrame::ENABLE_SNAP);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::ScrollCharacter(bool aRight)
{
nsIScrollableFrame* scrollFrame =
GetScrollableFrameToScroll(nsIPresShell::eHorizontal);
if (scrollFrame) {
int32_t h = Preferences::GetInt("toolkit.scrollbox.horizontalScrollDistance",
NS_DEFAULT_HORIZONTAL_SCROLL_DISTANCE);
scrollFrame->ScrollBy(nsIntPoint(aRight ? h : -h, 0),
nsIScrollableFrame::LINES,
nsIScrollableFrame::SMOOTH,
nullptr, nullptr,
nsIScrollableFrame::NOT_MOMENTUM,
nsIScrollableFrame::ENABLE_SNAP);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::CompleteScroll(bool aForward)
{
nsIScrollableFrame* scrollFrame =
GetScrollableFrameToScroll(nsIPresShell::eVertical);
if (scrollFrame) {
scrollFrame->ScrollBy(nsIntPoint(0, aForward ? 1 : -1),
nsIScrollableFrame::WHOLE,
nsIScrollableFrame::SMOOTH,
nullptr, nullptr,
nsIScrollableFrame::NOT_MOMENTUM,
nsIScrollableFrame::ENABLE_SNAP);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::CompleteMove(bool aForward, bool aExtend)
{
// Beware! This may flush notifications via synchronous
// ScrollSelectionIntoView.
RefPtr<nsFrameSelection> frameSelection = mSelection;
nsIContent* limiter = frameSelection->GetAncestorLimiter();
nsIFrame* frame = limiter ? limiter->GetPrimaryFrame()
: FrameConstructor()->GetRootElementFrame();
if (!frame)
return NS_ERROR_FAILURE;
nsIFrame::CaretPosition pos =
frame->GetExtremeCaretPosition(!aForward);
frameSelection->HandleClick(pos.mResultContent, pos.mContentOffset,
pos.mContentOffset, aExtend, false,
aForward ? CARET_ASSOCIATE_AFTER :
CARET_ASSOCIATE_BEFORE);
if (limiter) {
// HandleClick resets ancestorLimiter, so set it again.
frameSelection->SetAncestorLimiter(limiter);
}
// After ScrollSelectionIntoView(), the pending notifications might be
// flushed and PresShell/PresContext/Frames may be dead. See bug 418470.
return ScrollSelectionIntoView(nsISelectionController::SELECTION_NORMAL,
nsISelectionController::SELECTION_FOCUS_REGION,
nsISelectionController::SCROLL_SYNCHRONOUS |
nsISelectionController::SCROLL_FOR_CARET_MOVE);
}
NS_IMETHODIMP
PresShell::SelectAll()
{
RefPtr<nsFrameSelection> frameSelection = mSelection;
return frameSelection->SelectAll();
}
static void
DoCheckVisibility(nsPresContext* aPresContext,
nsIContent* aNode,
int16_t aStartOffset,
int16_t aEndOffset,
bool* aRetval)
{
nsIFrame* frame = aNode->GetPrimaryFrame();
if (!frame) {
// No frame to look at so it must not be visible.
return;
}
// Start process now to go through all frames to find startOffset. Then check
// chars after that to see if anything until EndOffset is visible.
bool finished = false;
frame->CheckVisibility(aPresContext, aStartOffset, aEndOffset, true,
&finished, aRetval);
// Don't worry about other return value.
}
NS_IMETHODIMP
PresShell::CheckVisibility(nsINode *node, int16_t startOffset, int16_t EndOffset, bool *_retval)
{
if (!node || startOffset>EndOffset || !_retval || startOffset<0 || EndOffset<0)
return NS_ERROR_INVALID_ARG;
*_retval = false; //initialize return parameter
nsCOMPtr<nsIContent> content(do_QueryInterface(node));
if (!content)
return NS_ERROR_FAILURE;
DoCheckVisibility(mPresContext, content, startOffset, EndOffset, _retval);
return NS_OK;
}
nsresult
PresShell::CheckVisibilityContent(nsIContent* aNode, int16_t aStartOffset,
int16_t aEndOffset, bool* aRetval)
{
if (!aNode || aStartOffset > aEndOffset || !aRetval ||
aStartOffset < 0 || aEndOffset < 0) {
return NS_ERROR_INVALID_ARG;
}
*aRetval = false;
DoCheckVisibility(mPresContext, aNode, aStartOffset, aEndOffset, aRetval);
return NS_OK;
}
//end implementations nsISelectionController
nsIFrame*
nsIPresShell::GetRootScrollFrame() const
{
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
// Ensure root frame is a viewport frame
if (!rootFrame || !rootFrame->IsViewportFrame())
return nullptr;
nsIFrame* theFrame = rootFrame->PrincipalChildList().FirstChild();
if (!theFrame || !theFrame->IsScrollFrame())
return nullptr;
return theFrame;
}
nsIScrollableFrame*
nsIPresShell::GetRootScrollFrameAsScrollable() const
{
nsIFrame* frame = GetRootScrollFrame();
if (!frame)
return nullptr;
nsIScrollableFrame* scrollableFrame = do_QueryFrame(frame);
NS_ASSERTION(scrollableFrame,
"All scroll frames must implement nsIScrollableFrame");
return scrollableFrame;
}
nsIPageSequenceFrame*
PresShell::GetPageSequenceFrame() const
{
nsIFrame* frame = mFrameConstructor->GetPageSequenceFrame();
return do_QueryFrame(frame);
}
nsCanvasFrame*
PresShell::GetCanvasFrame() const
{
nsIFrame* frame = mFrameConstructor->GetDocElementContainingBlock();
return do_QueryFrame(frame);
}
void
PresShell::RestoreRootScrollPosition()
{
nsIScrollableFrame* scrollableFrame = GetRootScrollFrameAsScrollable();
if (scrollableFrame) {
scrollableFrame->ScrollToRestoredPosition();
}
}
void
PresShell::MaybeReleaseCapturingContent()
{
RefPtr<nsFrameSelection> frameSelection = FrameSelection();
if (frameSelection) {
frameSelection->SetDragState(false);
}
if (gCaptureInfo.mContent &&
gCaptureInfo.mContent->OwnerDoc() == mDocument) {
SetCapturingContent(nullptr, 0);
}
}
void
PresShell::BeginLoad(nsIDocument *aDocument)
{
mDocumentLoading = true;
gfxTextPerfMetrics *tp = nullptr;
if (mPresContext) {
tp = mPresContext->GetTextPerfMetrics();
}
bool shouldLog = MOZ_LOG_TEST(gLog, LogLevel::Debug);
if (shouldLog || tp) {
mLoadBegin = TimeStamp::Now();
}
if (shouldLog) {
nsIURI* uri = mDocument->GetDocumentURI();
MOZ_LOG(gLog, LogLevel::Debug,
("(presshell) %p load begin [%s]\n",
this, uri ? uri->GetSpecOrDefault().get() : ""));
}
}
void
PresShell::EndLoad(nsIDocument *aDocument)
{
MOZ_ASSERT(aDocument == mDocument, "Wrong document");
RestoreRootScrollPosition();
mDocumentLoading = false;
}
void
PresShell::LoadComplete()
{
gfxTextPerfMetrics *tp = nullptr;
if (mPresContext) {
tp = mPresContext->GetTextPerfMetrics();
}
// log load
bool shouldLog = MOZ_LOG_TEST(gLog, LogLevel::Debug);
if (shouldLog || tp) {
TimeDuration loadTime = TimeStamp::Now() - mLoadBegin;
nsIURI* uri = mDocument->GetDocumentURI();
nsAutoCString spec;
if (uri) {
spec = uri->GetSpecOrDefault();
}
if (shouldLog) {
MOZ_LOG(gLog, LogLevel::Debug,
("(presshell) %p load done time-ms: %9.2f [%s]\n",
this, loadTime.ToMilliseconds(), spec.get()));
}
if (tp) {
tp->Accumulate();
if (tp->cumulative.numChars > 0) {
LogTextPerfStats(tp, this, tp->cumulative, loadTime.ToMilliseconds(),
eLog_loaddone, spec.get());
}
}
}
}
#ifdef DEBUG
void
PresShell::VerifyHasDirtyRootAncestor(nsIFrame* aFrame)
{
// XXXbz due to bug 372769, can't actually assert anything here...
return;
// XXXbz shouldn't need this part; remove it once FrameNeedsReflow
// handles the root frame correctly.
if (!aFrame->GetParent()) {
return;
}
// Make sure that there is a reflow root ancestor of |aFrame| that's
// in mDirtyRoots already.
while (aFrame && (aFrame->GetStateBits() & NS_FRAME_HAS_DIRTY_CHILDREN)) {
if (((aFrame->GetStateBits() & NS_FRAME_REFLOW_ROOT) ||
!aFrame->GetParent()) &&
mDirtyRoots.Contains(aFrame)) {
return;
}
aFrame = aFrame->GetParent();
}
MOZ_ASSERT_UNREACHABLE("Frame has dirty bits set but isn't scheduled to be "
"reflowed?");
}
#endif
void
PresShell::FrameNeedsReflow(nsIFrame *aFrame, IntrinsicDirty aIntrinsicDirty,
nsFrameState aBitToAdd,
ReflowRootHandling aRootHandling)
{
MOZ_ASSERT(aBitToAdd == NS_FRAME_IS_DIRTY ||
aBitToAdd == NS_FRAME_HAS_DIRTY_CHILDREN ||
!aBitToAdd,
"Unexpected bits being added");
// FIXME bug 478135
NS_ASSERTION(!(aIntrinsicDirty == eStyleChange &&
aBitToAdd == NS_FRAME_HAS_DIRTY_CHILDREN),
"bits don't correspond to style change reason");
// FIXME bug 457400
NS_ASSERTION(!mIsReflowing, "can't mark frame dirty during reflow");
// If we've not yet done the initial reflow, then don't bother
// enqueuing a reflow command yet.
if (! mDidInitialize)
return;
// If we're already destroying, don't bother with this either.
if (mIsDestroying)
return;
#ifdef DEBUG
//printf("gShellCounter: %d\n", gShellCounter++);
if (mInVerifyReflow)
return;
if (VERIFY_REFLOW_NOISY_RC & gVerifyReflowFlags) {
printf("\nPresShell@%p: frame %p needs reflow\n", (void*)this, (void*)aFrame);
if (VERIFY_REFLOW_REALLY_NOISY_RC & gVerifyReflowFlags) {
printf("Current content model:\n");
Element *rootElement = mDocument->GetRootElement();
if (rootElement) {
rootElement->List(stdout, 0);
}
}
}
#endif
AutoTArray<nsIFrame*, 4> subtrees;
subtrees.AppendElement(aFrame);
do {
nsIFrame *subtreeRoot = subtrees.PopLastElement();
// Grab |wasDirty| now so we can go ahead and update the bits on
// subtreeRoot.
bool wasDirty = NS_SUBTREE_DIRTY(subtreeRoot);
subtreeRoot->AddStateBits(aBitToAdd);
// Determine whether we need to keep looking for the next ancestor
// reflow root if subtreeRoot itself is a reflow root.
bool targetNeedsReflowFromParent;
switch (aRootHandling) {
case ePositionOrSizeChange:
targetNeedsReflowFromParent = true;
break;
case eNoPositionOrSizeChange:
targetNeedsReflowFromParent = false;
break;
case eInferFromBitToAdd:
targetNeedsReflowFromParent = (aBitToAdd == NS_FRAME_IS_DIRTY);
break;
}
#define FRAME_IS_REFLOW_ROOT(_f) \
((_f->GetStateBits() & NS_FRAME_REFLOW_ROOT) && \
(_f != subtreeRoot || !targetNeedsReflowFromParent))
// Mark the intrinsic widths as dirty on the frame, all of its ancestors,
// and all of its descendants, if needed:
if (aIntrinsicDirty != nsIPresShell::eResize) {
// Mark argument and all ancestors dirty. (Unless we hit a reflow
// root that should contain the reflow. That root could be
// subtreeRoot itself if it's not dirty, or it could be some
// ancestor of subtreeRoot.)
for (nsIFrame *a = subtreeRoot;
a && !FRAME_IS_REFLOW_ROOT(a);
a = a->GetParent())
a->MarkIntrinsicISizesDirty();
}
if (aIntrinsicDirty == eStyleChange) {
// Mark all descendants dirty (using an nsTArray stack rather than
// recursion).
// Note that ReflowInput::InitResizeFlags has some similar
// code; see comments there for how and why it differs.
AutoTArray<nsIFrame*, 32> stack;
stack.AppendElement(subtreeRoot);
do {
nsIFrame *f = stack.PopLastElement();
if (f->IsPlaceholderFrame()) {
nsIFrame *oof = nsPlaceholderFrame::GetRealFrameForPlaceholder(f);
if (!nsLayoutUtils::IsProperAncestorFrame(subtreeRoot, oof)) {
// We have another distinct subtree we need to mark.
subtrees.AppendElement(oof);
}
}
nsIFrame::ChildListIterator lists(f);
for (; !lists.IsDone(); lists.Next()) {
for (nsIFrame* kid : lists.CurrentList()) {
kid->MarkIntrinsicISizesDirty();
stack.AppendElement(kid);
}
}
} while (stack.Length() != 0);
}
// Skip setting dirty bits up the tree if we weren't given a bit to add.
if (!aBitToAdd) {
continue;
}
// Set NS_FRAME_HAS_DIRTY_CHILDREN bits (via nsIFrame::ChildIsDirty)
// up the tree until we reach either a frame that's already dirty or
// a reflow root.
nsIFrame *f = subtreeRoot;
for (;;) {
if (FRAME_IS_REFLOW_ROOT(f) || !f->GetParent()) {
// we've hit a reflow root or the root frame
if (!wasDirty) {
mDirtyRoots.AppendElement(f);
SetNeedLayoutFlush();
}
#ifdef DEBUG
else {
VerifyHasDirtyRootAncestor(f);
}
#endif
break;
}
nsIFrame *child = f;
f = f->GetParent();
wasDirty = NS_SUBTREE_DIRTY(f);
f->ChildIsDirty(child);
NS_ASSERTION(f->GetStateBits() & NS_FRAME_HAS_DIRTY_CHILDREN,
"ChildIsDirty didn't do its job");
if (wasDirty) {
// This frame was already marked dirty.
#ifdef DEBUG
VerifyHasDirtyRootAncestor(f);
#endif
break;
}
}
} while (subtrees.Length() != 0);
MaybeScheduleReflow();
}
void
PresShell::FrameNeedsToContinueReflow(nsIFrame *aFrame)
{
NS_ASSERTION(mIsReflowing, "Must be in reflow when marking path dirty.");
MOZ_ASSERT(mCurrentReflowRoot, "Must have a current reflow root here");
NS_ASSERTION(aFrame == mCurrentReflowRoot ||
nsLayoutUtils::IsProperAncestorFrame(mCurrentReflowRoot, aFrame),
"Frame passed in is not the descendant of mCurrentReflowRoot");
NS_ASSERTION(aFrame->GetStateBits() & NS_FRAME_IN_REFLOW,
"Frame passed in not in reflow?");
mFramesToDirty.PutEntry(aFrame);
}
already_AddRefed<nsIContent>
nsIPresShell::GetContentForScrolling() const
{
if (nsCOMPtr<nsIContent> focused = GetFocusedContentInOurWindow()) {
return focused.forget();
}
return GetSelectedContentForScrolling();
}
already_AddRefed<nsIContent>
nsIPresShell::GetSelectedContentForScrolling() const
{
nsCOMPtr<nsIContent> selectedContent;
if (mSelection) {
Selection* domSelection =
mSelection->GetSelection(SelectionType::eNormal);
if (domSelection) {
selectedContent = nsIContent::FromNodeOrNull(domSelection->GetFocusNode());
}
}
return selectedContent.forget();
}
nsIScrollableFrame*
nsIPresShell::GetNearestScrollableFrame(
nsIFrame* aFrame,
nsIPresShell::ScrollDirection aDirection)
{
if (aDirection == nsIPresShell::eEither) {
return nsLayoutUtils::GetNearestScrollableFrame(aFrame);
}
return nsLayoutUtils::GetNearestScrollableFrameForDirection(aFrame,
aDirection == eVertical ? nsLayoutUtils::eVertical :
nsLayoutUtils::eHorizontal);
}
nsIScrollableFrame*
nsIPresShell::GetScrollableFrameToScrollForContent(
nsIContent* aContent,
nsIPresShell::ScrollDirection aDirection)
{
nsIScrollableFrame* scrollFrame = nullptr;
if (aContent) {
nsIFrame* startFrame = aContent->GetPrimaryFrame();
if (startFrame) {
scrollFrame = startFrame->GetScrollTargetFrame();
if (scrollFrame) {
startFrame = scrollFrame->GetScrolledFrame();
}
scrollFrame = GetNearestScrollableFrame(startFrame, aDirection);
}
}
if (!scrollFrame) {
scrollFrame = GetRootScrollFrameAsScrollable();
if (!scrollFrame || !scrollFrame->GetScrolledFrame()) {
return nullptr;
}
scrollFrame = GetNearestScrollableFrame(scrollFrame->GetScrolledFrame(),
aDirection);
}
return scrollFrame;
}
nsIScrollableFrame*
nsIPresShell::GetScrollableFrameToScroll(nsIPresShell::ScrollDirection aDirection)
{
nsCOMPtr<nsIContent> content = GetContentForScrolling();
return GetScrollableFrameToScrollForContent(content.get(), aDirection);
}
void
PresShell::CancelAllPendingReflows()
{
mDirtyRoots.Clear();
if (mObservingLayoutFlushes) {
GetPresContext()->RefreshDriver()->RemoveLayoutFlushObserver(this);
mObservingLayoutFlushes = false;
}
ASSERT_REFLOW_SCHEDULED_STATE();
}
static bool
DestroyFramesAndStyleDataFor(Element* aElement,
nsPresContext& aPresContext,
RestyleManager::IncludeRoot aIncludeRoot)
{
bool didReconstruct =
aPresContext.FrameConstructor()->DestroyFramesFor(aElement);
RestyleManager::ClearServoDataFromSubtree(aElement, aIncludeRoot);
return didReconstruct;
}
void
nsIPresShell::SlotAssignmentWillChange(Element& aElement,
HTMLSlotElement* aOldSlot,
HTMLSlotElement* aNewSlot)
{
MOZ_ASSERT(aOldSlot != aNewSlot);
if (MOZ_UNLIKELY(!mDidInitialize)) {
return;
}
// If the old slot is about to become empty, let layout know that it needs to
// do work.
if (aOldSlot && aOldSlot->AssignedNodes().Length() == 1) {
DestroyFramesForAndRestyle(aOldSlot);
}
// Ensure the new element starts off clean.
DestroyFramesAndStyleDataFor(&aElement,
*mPresContext,
RestyleManager::IncludeRoot::Yes);
if (aNewSlot) {
// If the new slot will stop showing fallback content, we need to reframe it
// altogether.
if (aNewSlot->AssignedNodes().IsEmpty()) {
DestroyFramesForAndRestyle(aNewSlot);
// Otherwise we just care about the element, but we need to ensure that
// something takes care of traversing to the relevant slot, if needed.
} else if (aNewSlot->HasServoData() &&
!Servo_Element_IsDisplayNone(aNewSlot)) {
// Set the reframe bits...
aNewSlot->NoteDescendantsNeedFramesForServo();
aElement.SetFlags(NODE_NEEDS_FRAME);
// Now the style dirty bits. Note that we can't just do
// aElement.NoteDirtyForServo(), because the new slot is not setup yet.
aNewSlot->SetHasDirtyDescendantsForServo();
aNewSlot->NoteDirtySubtreeForServo();
}
}
}
#ifdef DEBUG
static void
AssertNoFramesInSubtree(nsIContent* aContent)
{
for (nsIContent* c = aContent; c; c = c->GetNextNode(aContent)) {
MOZ_ASSERT(!c->GetPrimaryFrame());
if (auto* shadowRoot = c->GetShadowRoot()) {
AssertNoFramesInSubtree(shadowRoot);
}
if (auto* binding = c->GetXBLBinding()) {
if (auto* bindingWithContent = binding->GetBindingWithContent()) {
nsIContent* anonContent = bindingWithContent->GetAnonymousContent();
MOZ_ASSERT(!anonContent->GetPrimaryFrame());
// Need to do this instead of just AssertNoFramesInSubtree(anonContent),
// because the parent of the children of the <content> element isn't the
// <content> element, but the bound element, and that confuses
// GetNextNode a lot.
for (nsIContent* child = anonContent->GetFirstChild();
child;
child = child->GetNextSibling()) {
AssertNoFramesInSubtree(child);
}
}
}
}
}
#endif
void
nsIPresShell::DestroyFramesForAndRestyle(Element* aElement)
{
#ifdef DEBUG
auto postCondition = mozilla::MakeScopeExit([&]() {
AssertNoFramesInSubtree(aElement);
});
#endif
MOZ_ASSERT(aElement);
if (MOZ_UNLIKELY(!mDidInitialize)) {
return;
}
if (!aElement->GetFlattenedTreeParentNode()) {
// Nothing to do here, the element already is out of the frame tree.
return;
}
nsAutoScriptBlocker scriptBlocker;
// Mark ourselves as not safe to flush while we're doing frame destruction.
++mChangeNestCount;
const bool didReconstruct = FrameConstructor()->DestroyFramesFor(aElement);
// Clear the style data from all the flattened tree descendants, but _not_
// from us, since otherwise we wouldn't see the reframe.
RestyleManager::ClearServoDataFromSubtree(
aElement, RestyleManager::IncludeRoot::No);
auto changeHint = didReconstruct
? nsChangeHint(0)
: nsChangeHint_ReconstructFrame;
// NOTE(emilio): eRestyle_Subtree is needed to force also a full subtree
// restyle for the content (in Stylo, where the existence of frames != the
// existence of styles).
mPresContext->RestyleManager()->PostRestyleEvent(
aElement, eRestyle_Subtree, changeHint);
--mChangeNestCount;
}
void
nsIPresShell::PostRecreateFramesFor(Element* aElement)
{
if (MOZ_UNLIKELY(!mDidInitialize)) {
// Nothing to do here. In fact, if we proceed and aElement is the root, we
// will crash.
return;
}
mPresContext->RestyleManager()->PostRestyleEvent(aElement, nsRestyleHint(0),
nsChangeHint_ReconstructFrame);
}
void
nsIPresShell::RestyleForAnimation(Element* aElement, nsRestyleHint aHint)
{
// Now that we no longer have separate non-animation and animation
// restyles, this method having a distinct identity is less important,
// but it still seems useful to offer as a "more public" API and as a
// chokepoint for these restyles to go through.
mPresContext->RestyleManager()->PostRestyleEvent(aElement, aHint,
nsChangeHint(0));
}
void
nsIPresShell::SetForwardingContainer(const WeakPtr<nsDocShell> &aContainer)
{
mForwardingContainer = aContainer;
}
void
PresShell::ClearFrameRefs(nsIFrame* aFrame)
{
mPresContext->EventStateManager()->ClearFrameRefs(aFrame);
AutoWeakFrame* weakFrame = mAutoWeakFrames;
while (weakFrame) {
AutoWeakFrame* prev = weakFrame->GetPreviousWeakFrame();
if (weakFrame->GetFrame() == aFrame) {
// This removes weakFrame from mAutoWeakFrames.
weakFrame->Clear(this);
}
weakFrame = prev;
}
AutoTArray<WeakFrame*, 4> toRemove;
for (auto iter = mWeakFrames.Iter(); !iter.Done(); iter.Next()) {
WeakFrame* weakFrame = iter.Get()->GetKey();
if (weakFrame->GetFrame() == aFrame) {
toRemove.AppendElement(weakFrame);
}
}
for (WeakFrame* weakFrame : toRemove) {
weakFrame->Clear(this);
}
}
already_AddRefed<gfxContext>
PresShell::CreateReferenceRenderingContext()
{
nsDeviceContext* devCtx = mPresContext->DeviceContext();
RefPtr<gfxContext> rc;
if (mPresContext->IsScreen()) {
rc = gfxContext::CreateOrNull(
gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget().get());
} else {
// We assume the devCtx has positive width and height for this call.
// However, width and height, may be outside of the reasonable range
// so rc may still be null.
rc = devCtx->CreateReferenceRenderingContext();
}
return rc ? rc.forget() : nullptr;
}
nsresult
PresShell::GoToAnchor(const nsAString& aAnchorName, bool aScroll,
uint32_t aAdditionalScrollFlags)
{
if (!mDocument) {
return NS_ERROR_FAILURE;
}
const Element *root = mDocument->GetRootElement();
if (root && root->IsSVGElement(nsGkAtoms::svg)) {
// We need to execute this even if there is an empty anchor name
// so that any existing SVG fragment identifier effect is removed
if (SVGFragmentIdentifier::ProcessFragmentIdentifier(mDocument, aAnchorName)) {
return NS_OK;
}
}
// Hold a reference to the ESM in case event dispatch tears us down.
RefPtr<EventStateManager> esm = mPresContext->EventStateManager();
if (aAnchorName.IsEmpty()) {
NS_ASSERTION(!aScroll, "can't scroll to empty anchor name");
esm->SetContentState(nullptr, NS_EVENT_STATE_URLTARGET);
return NS_OK;
}
nsresult rv = NS_OK;
nsCOMPtr<nsIContent> content;
// Search for an element with a matching "id" attribute
if (mDocument) {
content = mDocument->GetElementById(aAnchorName);
}
// Search for an anchor element with a matching "name" attribute
if (!content && mDocument->IsHTMLDocument()) {
// Find a matching list of named nodes
nsCOMPtr<nsINodeList> list = mDocument->GetElementsByName(aAnchorName);
if (list) {
// Loop through the named nodes looking for the first anchor
uint32_t length = list->Length();
for (uint32_t i = 0; i < length; i++) {
nsIContent* node = list->Item(i);
if (node->IsHTMLElement(nsGkAtoms::a)) {
content = node;
break;
}
}
}
}
// Search for anchor in the HTML namespace with a matching name
if (!content && !mDocument->IsHTMLDocument())
{
NS_NAMED_LITERAL_STRING(nameSpace, "http://www.w3.org/1999/xhtml");
// Get the list of anchor elements
nsCOMPtr<nsINodeList> list =
mDocument->GetElementsByTagNameNS(nameSpace, NS_LITERAL_STRING("a"));
// Loop through the anchors looking for the first one with the given name.
for (uint32_t i = 0; true; i++) {
nsIContent* node = list->Item(i);
if (!node) { // End of list
break;
}
// Compare the name attribute
if (node->IsElement() &&
node->AsElement()->AttrValueIs(kNameSpaceID_None,
nsGkAtoms::name,
aAnchorName,
eCaseMatters)) {
content = node;
break;
}
}
}
esm->SetContentState(content, NS_EVENT_STATE_URLTARGET);
#ifdef ACCESSIBILITY
nsIContent *anchorTarget = content;
#endif
nsIScrollableFrame* rootScroll = GetRootScrollFrameAsScrollable();
if (rootScroll && rootScroll->DidHistoryRestore()) {
// Scroll position restored from history trumps scrolling to anchor.
aScroll = false;
rootScroll->ClearDidHistoryRestore();
}
if (content) {
if (aScroll) {
rv = ScrollContentIntoView(content,
ScrollAxis(SCROLL_TOP, SCROLL_ALWAYS),
ScrollAxis(),
ANCHOR_SCROLL_FLAGS | aAdditionalScrollFlags);
NS_ENSURE_SUCCESS(rv, rv);
nsIScrollableFrame* rootScroll = GetRootScrollFrameAsScrollable();
if (rootScroll) {
mLastAnchorScrolledTo = content;
mLastAnchorScrollPositionY = rootScroll->GetScrollPosition().y;
}
}
// Should we select the target? This action is controlled by a
// preference: the default is to not select.
bool selectAnchor = Preferences::GetBool("layout.selectanchor");
// Even if select anchor pref is false, we must still move the
// caret there. That way tabbing will start from the new
// location
RefPtr<nsRange> jumpToRange = new nsRange(mDocument);
while (content && content->GetFirstChild()) {
content = content->GetFirstChild();
}
jumpToRange->SelectNodeContents(*content, IgnoreErrors());
// Select the anchor
RefPtr<Selection> sel = mSelection->GetSelection(SelectionType::eNormal);
if (sel) {
sel->RemoveAllRanges(IgnoreErrors());
sel->AddRange(*jumpToRange, IgnoreErrors());
if (!selectAnchor) {
// Use a caret (collapsed selection) at the start of the anchor
sel->CollapseToStart(IgnoreErrors());
}
}
// Selection is at anchor.
// Now focus the document itself if focus is on an element within it.
nsPIDOMWindowOuter *win = mDocument->GetWindow();
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm && win) {
nsCOMPtr<mozIDOMWindowProxy> focusedWindow;
fm->GetFocusedWindow(getter_AddRefs(focusedWindow));
if (SameCOMIdentity(win, focusedWindow)) {
fm->ClearFocus(focusedWindow);
}
}
// If the target is an animation element, activate the animation
if (content->IsNodeOfType(nsINode::eANIMATION)) {
SVGContentUtils::ActivateByHyperlink(content.get());
}
} else {
rv = NS_ERROR_FAILURE;
NS_NAMED_LITERAL_STRING(top, "top");
if (nsContentUtils::EqualsIgnoreASCIICase(aAnchorName, top)) {
// Scroll to the top/left if aAnchorName is "top" and there is no element
// with such a name or id.
rv = NS_OK;
nsIScrollableFrame* sf = GetRootScrollFrameAsScrollable();
// Check |aScroll| after setting |rv| so we set |rv| to the same
// thing whether or not |aScroll| is true.
if (aScroll && sf) {
// Scroll to the top of the page
sf->ScrollTo(nsPoint(0, 0), nsIScrollableFrame::INSTANT);
}
}
}
#ifdef ACCESSIBILITY
if (anchorTarget) {
nsAccessibilityService* accService = AccService();
if (accService)
accService->NotifyOfAnchorJumpTo(anchorTarget);
}
#endif
return rv;
}
nsresult
PresShell::ScrollToAnchor()
{
if (!mLastAnchorScrolledTo) {
return NS_OK;
}
NS_ASSERTION(mDidInitialize, "should have done initial reflow by now");
nsIScrollableFrame* rootScroll = GetRootScrollFrameAsScrollable();
if (!rootScroll ||
mLastAnchorScrollPositionY != rootScroll->GetScrollPosition().y) {
return NS_OK;
}
nsresult rv = ScrollContentIntoView(mLastAnchorScrolledTo,
ScrollAxis(SCROLL_TOP, SCROLL_ALWAYS),
ScrollAxis(),
ANCHOR_SCROLL_FLAGS);
mLastAnchorScrolledTo = nullptr;
return rv;
}
/*
* Helper (per-continuation) for ScrollContentIntoView.
*
* @param aContainerFrame [in] the frame which aRect is relative to
* @param aFrame [in] Frame whose bounds should be unioned
* @param aUseWholeLineHeightForInlines [in] if true, then for inline frames
* we should include the top of the line in the added rectangle
* @param aRect [inout] rect into which its bounds should be unioned
* @param aHaveRect [inout] whether aRect contains data yet
* @param aPrevBlock [inout] the block aLines is a line iterator for
* @param aLines [inout] the line iterator we're using
* @param aCurLine [inout] the line to start looking from in this iterator
*/
static void
AccumulateFrameBounds(nsIFrame* aContainerFrame,
nsIFrame* aFrame,
bool aUseWholeLineHeightForInlines,
nsRect& aRect,
bool& aHaveRect,
nsIFrame*& aPrevBlock,
nsAutoLineIterator& aLines,
int32_t& aCurLine)
{
nsIFrame* frame = aFrame;
nsRect frameBounds = nsRect(nsPoint(0, 0), aFrame->GetSize());
// If this is an inline frame and either the bounds height is 0 (quirks
// layout model) or aUseWholeLineHeightForInlines is set, we need to
// change the top of the bounds to include the whole line.
if (frameBounds.height == 0 || aUseWholeLineHeightForInlines) {
nsIFrame *prevFrame = aFrame;
nsIFrame *f = aFrame;
while (f && f->IsFrameOfType(nsIFrame::eLineParticipant) &&
!f->IsTransformed() && !f->IsAbsPosContainingBlock()) {
prevFrame = f;
f = prevFrame->GetParent();
}
if (f != aFrame && f && f->IsBlockFrame()) {
// find the line containing aFrame and increase the top of |offset|.
if (f != aPrevBlock) {
aLines = f->GetLineIterator();
aPrevBlock = f;
aCurLine = 0;
}
if (aLines) {
int32_t index = aLines->FindLineContaining(prevFrame, aCurLine);
if (index >= 0) {
aCurLine = index;
nsIFrame *trash1;
int32_t trash2;
nsRect lineBounds;
if (NS_SUCCEEDED(aLines->GetLine(index, &trash1, &trash2,
lineBounds))) {
frameBounds += frame->GetOffsetTo(f);
frame = f;
if (lineBounds.y < frameBounds.y) {
frameBounds.height = frameBounds.YMost() - lineBounds.y;
frameBounds.y = lineBounds.y;
}
}
}
}
}
}
nsRect transformedBounds = nsLayoutUtils::TransformFrameRectToAncestor(frame,
frameBounds, aContainerFrame);
if (aHaveRect) {
// We can't use nsRect::UnionRect since it drops empty rects on
// the floor, and we need to include them. (Thus we need
// aHaveRect to know when to drop the initial value on the floor.)
aRect.UnionRectEdges(aRect, transformedBounds);
} else {
aHaveRect = true;
aRect = transformedBounds;
}
}
static bool
ComputeNeedToScroll(nsIPresShell::WhenToScroll aWhenToScroll,
nscoord aLineSize,
nscoord aRectMin,
nscoord aRectMax,
nscoord aViewMin,
nscoord aViewMax) {
// See how the rect should be positioned vertically
if (nsIPresShell::SCROLL_ALWAYS == aWhenToScroll) {
// The caller wants the frame as visible as possible
return true;
} else if (nsIPresShell::SCROLL_IF_NOT_VISIBLE == aWhenToScroll) {
// Scroll only if no part of the frame is visible in this view
return aRectMax - aLineSize <= aViewMin ||
aRectMin + aLineSize >= aViewMax;
} else if (nsIPresShell::SCROLL_IF_NOT_FULLY_VISIBLE == aWhenToScroll) {
// Scroll only if part of the frame is hidden and more can fit in view
return !(aRectMin >= aViewMin && aRectMax <= aViewMax) &&
std::min(aViewMax, aRectMax) - std::max(aRectMin, aViewMin) < aViewMax - aViewMin;
}
return false;
}
static nscoord
ComputeWhereToScroll(int16_t aWhereToScroll,
nscoord aOriginalCoord,
nscoord aRectMin,
nscoord aRectMax,
nscoord aViewMin,
nscoord aViewMax,
nscoord* aRangeMin,
nscoord* aRangeMax) {
nscoord resultCoord = aOriginalCoord;
nscoord scrollPortLength = aViewMax - aViewMin;
if (nsIPresShell::SCROLL_MINIMUM == aWhereToScroll) {
// Scroll the minimum amount necessary to show as much as possible of the frame.
// If the frame is too large, don't hide any initially visible part of it.
nscoord min = std::min(aRectMin, aRectMax - scrollPortLength);
nscoord max = std::max(aRectMin, aRectMax - scrollPortLength);
resultCoord = std::min(std::max(aOriginalCoord, min), max);
} else {
nscoord frameAlignCoord =
NSToCoordRound(aRectMin + (aRectMax - aRectMin) * (aWhereToScroll / 100.0f));
resultCoord = NSToCoordRound(frameAlignCoord - scrollPortLength * (
aWhereToScroll / 100.0f));
}
// Force the scroll range to extend to include resultCoord.
*aRangeMin = std::min(resultCoord, aRectMax - scrollPortLength);
*aRangeMax = std::max(resultCoord, aRectMin);
return resultCoord;
}
/**
* This function takes a scrollable frame, a rect in the coordinate system
* of the scrolled frame, and a desired percentage-based scroll
* position and attempts to scroll the rect to that position in the
* scrollport.
*
* This needs to work even if aRect has a width or height of zero.
*/
static void ScrollToShowRect(nsIScrollableFrame* aFrameAsScrollable,
const nsRect& aRect,
nsIPresShell::ScrollAxis aVertical,
nsIPresShell::ScrollAxis aHorizontal,
uint32_t aFlags)
{
nsPoint scrollPt = aFrameAsScrollable->GetScrollPosition();
nsRect visibleRect(scrollPt,
aFrameAsScrollable->GetVisualViewportSize());
nsSize lineSize;
// Don't call GetLineScrollAmount unless we actually need it. Not only
// does this save time, but it's not safe to call GetLineScrollAmount
// during reflow (because it depends on font size inflation and doesn't
// use the in-reflow-safe font-size inflation path). If we did call it,
// it would assert and possible give the wrong result.
if (aVertical.mWhenToScroll == nsIPresShell::SCROLL_IF_NOT_VISIBLE ||
aHorizontal.mWhenToScroll == nsIPresShell::SCROLL_IF_NOT_VISIBLE) {
lineSize = aFrameAsScrollable->GetLineScrollAmount();
}
ScrollStyles ss = aFrameAsScrollable->GetScrollStyles();
nsRect allowedRange(scrollPt, nsSize(0, 0));
bool needToScroll = false;
uint32_t directions = aFrameAsScrollable->GetPerceivedScrollingDirections();
if (((aFlags & nsIPresShell::SCROLL_OVERFLOW_HIDDEN) ||
ss.mVertical != NS_STYLE_OVERFLOW_HIDDEN) &&
(!aVertical.mOnlyIfPerceivedScrollableDirection ||
(directions & nsIScrollableFrame::VERTICAL))) {
if (ComputeNeedToScroll(aVertical.mWhenToScroll,
lineSize.height,
aRect.y,
aRect.YMost(),
visibleRect.y,
visibleRect.YMost())) {
nscoord maxHeight;
scrollPt.y = ComputeWhereToScroll(aVertical.mWhereToScroll,
scrollPt.y,
aRect.y,
aRect.YMost(),
visibleRect.y,
visibleRect.YMost(),
&allowedRange.y, &maxHeight);
allowedRange.height = maxHeight - allowedRange.y;
needToScroll = true;
}
}
if (((aFlags & nsIPresShell::SCROLL_OVERFLOW_HIDDEN) ||
ss.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN) &&
(!aHorizontal.mOnlyIfPerceivedScrollableDirection ||
(directions & nsIScrollableFrame::HORIZONTAL))) {
if (ComputeNeedToScroll(aHorizontal.mWhenToScroll,
lineSize.width,
aRect.x,
aRect.XMost(),
visibleRect.x,
visibleRect.XMost())) {
nscoord maxWidth;
scrollPt.x = ComputeWhereToScroll(aHorizontal.mWhereToScroll,
scrollPt.x,
aRect.x,
aRect.XMost(),
visibleRect.x,
visibleRect.XMost(),
&allowedRange.x, &maxWidth);
allowedRange.width = maxWidth - allowedRange.x;
needToScroll = true;
}
}
// If we don't need to scroll, then don't try since it might cancel
// a current smooth scroll operation.
if (needToScroll) {
nsIScrollableFrame::ScrollMode scrollMode = nsIScrollableFrame::INSTANT;
bool autoBehaviorIsSmooth = (aFrameAsScrollable->GetScrollStyles().mScrollBehavior
== NS_STYLE_SCROLL_BEHAVIOR_SMOOTH);
bool smoothScroll = (aFlags & nsIPresShell::SCROLL_SMOOTH) ||
((aFlags & nsIPresShell::SCROLL_SMOOTH_AUTO) && autoBehaviorIsSmooth);
if (gfxPrefs::ScrollBehaviorEnabled() && smoothScroll) {
scrollMode = nsIScrollableFrame::SMOOTH_MSD;
}
aFrameAsScrollable->ScrollTo(scrollPt, scrollMode, &allowedRange);
}
}
nsresult
PresShell::ScrollContentIntoView(nsIContent* aContent,
nsIPresShell::ScrollAxis aVertical,
nsIPresShell::ScrollAxis aHorizontal,
uint32_t aFlags)
{
NS_ENSURE_TRUE(aContent, NS_ERROR_NULL_POINTER);
nsCOMPtr<nsIDocument> composedDoc = aContent->GetComposedDoc();
NS_ENSURE_STATE(composedDoc);
NS_ASSERTION(mDidInitialize, "should have done initial reflow by now");
if (mContentToScrollTo) {
mContentToScrollTo->DeleteProperty(nsGkAtoms::scrolling);
}
mContentToScrollTo = aContent;
ScrollIntoViewData* data = new ScrollIntoViewData();
data->mContentScrollVAxis = aVertical;
data->mContentScrollHAxis = aHorizontal;
data->mContentToScrollToFlags = aFlags;
if (NS_FAILED(mContentToScrollTo->SetProperty(nsGkAtoms::scrolling, data,
nsINode::DeleteProperty<PresShell::ScrollIntoViewData>))) {
mContentToScrollTo = nullptr;
}
// Flush layout and attempt to scroll in the process.
if (nsIPresShell* shell = composedDoc->GetShell()) {
shell->SetNeedLayoutFlush();
}
composedDoc->FlushPendingNotifications(FlushType::InterruptibleLayout);
// If mContentToScrollTo is non-null, that means we interrupted the reflow
// (or suppressed it altogether because we're suppressing interruptible
// flushes right now) and won't necessarily get the position correct, but do
// a best-effort scroll here. The other option would be to do this inside
// FlushPendingNotifications, but I'm not sure the repeated scrolling that
// could trigger if reflows keep getting interrupted would be more desirable
// than a single best-effort scroll followed by one final scroll on the first
// completed reflow.
if (mContentToScrollTo) {
DoScrollContentIntoView();
}
return NS_OK;
}
void
PresShell::DoScrollContentIntoView()
{
NS_ASSERTION(mDidInitialize, "should have done initial reflow by now");
nsIFrame* frame = mContentToScrollTo->GetPrimaryFrame();
if (!frame) {
mContentToScrollTo->DeleteProperty(nsGkAtoms::scrolling);
mContentToScrollTo = nullptr;
return;
}
if (frame->GetStateBits() & NS_FRAME_FIRST_REFLOW) {
// The reflow flush before this scroll got interrupted, and this frame's
// coords and size are all zero, and it has no content showing anyway.
// Don't bother scrolling to it. We'll try again when we finish up layout.
return;
}
// Make sure we skip 'frame' ... if it's scrollable, we should use its
// scrollable ancestor as the container.
nsIFrame* container = nsLayoutUtils::GetClosestFrameOfType(
frame->GetParent(), LayoutFrameType::Scroll);
if (!container) {
// nothing can be scrolled
return;
}
ScrollIntoViewData* data = static_cast<ScrollIntoViewData*>(
mContentToScrollTo->GetProperty(nsGkAtoms::scrolling));
if (MOZ_UNLIKELY(!data)) {
mContentToScrollTo = nullptr;
return;
}
// This is a two-step process.
// Step 1: Find the bounds of the rect we want to scroll into view. For
// example, for an inline frame we may want to scroll in the whole
// line, or we may want to scroll multiple lines into view.
// Step 2: Walk container frame and its ancestors and scroll them
// appropriately.
// frameBounds is relative to container. We're assuming
// that scrollframes don't split so every continuation of frame will
// be a descendant of container. (Things would still mostly work
// even if that assumption was false.)
nsRect frameBounds;
bool haveRect = false;
bool useWholeLineHeightForInlines =
data->mContentScrollVAxis.mWhenToScroll != nsIPresShell::SCROLL_IF_NOT_FULLY_VISIBLE;
// Reuse the same line iterator across calls to AccumulateFrameBounds. We set
// it every time we detect a new block (stored in prevBlock).
nsIFrame* prevBlock = nullptr;
nsAutoLineIterator lines;
// The last line we found a continuation on in |lines|. We assume that later
// continuations cannot come on earlier lines.
int32_t curLine = 0;
do {
AccumulateFrameBounds(container, frame, useWholeLineHeightForInlines,
frameBounds, haveRect, prevBlock, lines, curLine);
} while ((frame = frame->GetNextContinuation()));
ScrollFrameRectIntoView(container, frameBounds, data->mContentScrollVAxis,
data->mContentScrollHAxis,
data->mContentToScrollToFlags);
}
bool
PresShell::ScrollFrameRectIntoView(nsIFrame* aFrame,
const nsRect& aRect,
nsIPresShell::ScrollAxis aVertical,
nsIPresShell::ScrollAxis aHorizontal,
uint32_t aFlags)
{
bool didScroll = false;
// This function needs to work even if rect has a width or height of 0.
nsRect rect = aRect;
nsIFrame* container = aFrame;
// Walk up the frame hierarchy scrolling the rect into view and
// keeping rect relative to container
do {
nsIScrollableFrame* sf = do_QueryFrame(container);
if (sf) {
nsPoint oldPosition = sf->GetScrollPosition();
nsRect targetRect = rect;
// Inflate the scrolled rect by the container's padding in each dimension,
// unless we have 'overflow-clip-box-*: content-box' in that dimension.
auto* disp = container->StyleDisplay();
if (disp->mOverflowClipBoxBlock ==
NS_STYLE_OVERFLOW_CLIP_BOX_CONTENT_BOX ||
disp->mOverflowClipBoxInline ==
NS_STYLE_OVERFLOW_CLIP_BOX_CONTENT_BOX) {
WritingMode wm = container->GetWritingMode();
bool cbH = (wm.IsVertical() ? disp->mOverflowClipBoxBlock
: disp->mOverflowClipBoxInline) ==
NS_STYLE_OVERFLOW_CLIP_BOX_CONTENT_BOX;
bool cbV = (wm.IsVertical() ? disp->mOverflowClipBoxInline
: disp->mOverflowClipBoxBlock) ==
NS_STYLE_OVERFLOW_CLIP_BOX_CONTENT_BOX;
nsMargin padding = container->GetUsedPadding();
if (!cbH) {
padding.left = padding.right = nscoord(0);
}
if (!cbV) {
padding.top = padding.bottom = nscoord(0);
}
targetRect.Inflate(padding);
}
ScrollToShowRect(sf, targetRect - sf->GetScrolledFrame()->GetPosition(),
aVertical, aHorizontal, aFlags);
nsPoint newPosition = sf->LastScrollDestination();
// If the scroll position increased, that means our content moved up,
// so our rect's offset should decrease
rect += oldPosition - newPosition;
if (oldPosition != newPosition) {
didScroll = true;
}
// only scroll one container when this flag is set
if (aFlags & nsIPresShell::SCROLL_FIRST_ANCESTOR_ONLY) {
break;
}
}
nsIFrame* parent;
if (container->IsTransformed()) {
container->GetTransformMatrix(nullptr, &parent);
rect = nsLayoutUtils::TransformFrameRectToAncestor(container, rect, parent);
} else {
rect += container->GetPosition();
parent = container->GetParent();
}
if (!parent && !(aFlags & nsIPresShell::SCROLL_NO_PARENT_FRAMES)) {
nsPoint extraOffset(0,0);
parent = nsLayoutUtils::GetCrossDocParentFrame(container, &extraOffset);
if (parent) {
int32_t APD = container->PresContext()->AppUnitsPerDevPixel();
int32_t parentAPD = parent->PresContext()->AppUnitsPerDevPixel();
rect = rect.ScaleToOtherAppUnitsRoundOut(APD, parentAPD);
rect += extraOffset;
}
}
container = parent;
} while (container);
return didScroll;
}
nsRectVisibility
PresShell::GetRectVisibility(nsIFrame* aFrame,
const nsRect &aRect,
nscoord aMinTwips) const
{
NS_ASSERTION(aFrame->PresContext() == GetPresContext(),
"prescontext mismatch?");
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
NS_ASSERTION(rootFrame,
"How can someone have a frame for this presshell when there's no root?");
nsIScrollableFrame* sf = GetRootScrollFrameAsScrollable();
nsRect scrollPortRect;
if (sf) {
scrollPortRect = sf->GetScrollPortRect();
nsIFrame* f = do_QueryFrame(sf);
scrollPortRect += f->GetOffsetTo(rootFrame);
} else {
scrollPortRect = nsRect(nsPoint(0,0), rootFrame->GetSize());
}
// scrollPortRect has the viewport visible area relative to rootFrame.
nsRect visibleAreaRect(scrollPortRect);
// Find the intersection of this and the frame's ancestor scrollable
// frames. We walk the whole ancestor chain to find all the scrollable
// frames.
nsIScrollableFrame* scrollAncestorFrame =
nsLayoutUtils::GetNearestScrollableFrame(aFrame,
nsLayoutUtils::SCROLLABLE_INCLUDE_HIDDEN);
while (scrollAncestorFrame) {
nsRect scrollAncestorRect = scrollAncestorFrame->GetScrollPortRect();
nsIFrame* f = do_QueryFrame(scrollAncestorFrame);
scrollAncestorRect += f->GetOffsetTo(rootFrame);
visibleAreaRect = visibleAreaRect.Intersect(scrollAncestorRect);
// Continue up the chain.
scrollAncestorFrame =
nsLayoutUtils::GetNearestScrollableFrame(f->GetParent(),
nsLayoutUtils::SCROLLABLE_INCLUDE_HIDDEN);
}
// aRect is in the aFrame coordinate space, so bring it into rootFrame
// coordinate space.
nsRect r = aRect + aFrame->GetOffsetTo(rootFrame);
// If aRect is entirely visible then we don't need to ensure that
// at least aMinTwips of it is visible
if (visibleAreaRect.Contains(r)) {
return nsRectVisibility_kVisible;
}
nsRect insetRect = visibleAreaRect;
insetRect.Deflate(aMinTwips, aMinTwips);
if (r.YMost() <= insetRect.y)
return nsRectVisibility_kAboveViewport;
if (r.y >= insetRect.YMost())
return nsRectVisibility_kBelowViewport;
if (r.XMost() <= insetRect.x)
return nsRectVisibility_kLeftOfViewport;
if (r.x >= insetRect.XMost())
return nsRectVisibility_kRightOfViewport;
return nsRectVisibility_kVisible;
}
void
PresShell::ScheduleViewManagerFlush(PaintType aType)
{
if (MOZ_UNLIKELY(mIsDestroying)) {
return;
}
if (aType == PAINT_DELAYED_COMPRESS) {
// Delay paint for 1 second.
static const uint32_t kPaintDelayPeriod = 1000;
if (!mDelayedPaintTimer) {
nsTimerCallbackFunc
PaintTimerCallBack = [](nsITimer* aTimer, void* aClosure) {
// The passed-in PresShell is always alive here. Because if PresShell
// died, mDelayedPaintTimer->Cancel() would be called during the
// destruction and this callback would never be invoked.
auto self = static_cast<PresShell*>(aClosure);
self->SetNextPaintCompressed();
self->ScheduleViewManagerFlush();
};
NS_NewTimerWithFuncCallback(getter_AddRefs(mDelayedPaintTimer),
PaintTimerCallBack,
this,
kPaintDelayPeriod,
nsITimer::TYPE_ONE_SHOT,
"PaintTimerCallBack",
mDocument->EventTargetFor(TaskCategory::Other));
}
return;
}
nsPresContext* presContext = GetPresContext();
if (presContext) {
presContext->RefreshDriver()->ScheduleViewManagerFlush();
}
SetNeedLayoutFlush();
}
void
nsIPresShell::DispatchSynthMouseMove(WidgetGUIEvent* aEvent)
{
AUTO_PROFILER_TRACING("Paint", "DispatchSynthMouseMove");
nsEventStatus status = nsEventStatus_eIgnore;
nsView* targetView = nsView::GetViewFor(aEvent->mWidget);
if (!targetView)
return;
targetView->GetViewManager()->DispatchEvent(aEvent, targetView, &status);
}
void
PresShell::ClearMouseCaptureOnView(nsView* aView)
{
if (gCaptureInfo.mContent) {
if (aView) {
// if a view was specified, ensure that the captured content is within
// this view.
nsIFrame* frame = gCaptureInfo.mContent->GetPrimaryFrame();
if (frame) {
nsView* view = frame->GetClosestView();
// if there is no view, capturing won't be handled any more, so
// just release the capture.
if (view) {
do {
if (view == aView) {
gCaptureInfo.mContent = nullptr;
// the view containing the captured content likely disappeared so
// disable capture for now.
gCaptureInfo.mAllowed = false;
break;
}
view = view->GetParent();
} while (view);
// return if the view wasn't found
return;
}
}
}
gCaptureInfo.mContent = nullptr;
}
// disable mouse capture until the next mousedown as a dialog has opened
// or a drag has started. Otherwise, someone could start capture during
// the modal dialog or drag.
gCaptureInfo.mAllowed = false;
}
void
nsIPresShell::ClearMouseCapture(nsIFrame* aFrame)
{
if (!gCaptureInfo.mContent) {
gCaptureInfo.mAllowed = false;
return;
}
// null frame argument means clear the capture
if (!aFrame) {
gCaptureInfo.mContent = nullptr;
gCaptureInfo.mAllowed = false;
return;
}
nsIFrame* capturingFrame = gCaptureInfo.mContent->GetPrimaryFrame();
if (!capturingFrame) {
gCaptureInfo.mContent = nullptr;
gCaptureInfo.mAllowed = false;
return;
}
if (nsLayoutUtils::IsAncestorFrameCrossDoc(aFrame, capturingFrame)) {
gCaptureInfo.mContent = nullptr;
gCaptureInfo.mAllowed = false;
}
}
nsresult
PresShell::CaptureHistoryState(nsILayoutHistoryState** aState)
{
MOZ_ASSERT(nullptr != aState, "null state pointer");
// We actually have to mess with the docshell here, since we want to
// store the state back in it.
// XXXbz this isn't really right, since this is being called in the
// content viewer's Hide() method... by that point the docshell's
// state could be wrong. We should sort out a better ownership
// model for the layout history state.
nsCOMPtr<nsIDocShell> docShell(mPresContext->GetDocShell());
if (!docShell)
return NS_ERROR_FAILURE;
nsCOMPtr<nsILayoutHistoryState> historyState;
docShell->GetLayoutHistoryState(getter_AddRefs(historyState));
if (!historyState) {
// Create the document state object
historyState = NS_NewLayoutHistoryState();
docShell->SetLayoutHistoryState(historyState);
}
*aState = historyState;
NS_IF_ADDREF(*aState);
// Capture frame state for the entire frame hierarchy
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (!rootFrame) return NS_OK;
mFrameConstructor->CaptureFrameState(rootFrame, historyState);
return NS_OK;
}
void
PresShell::ScheduleBeforeFirstPaint()
{
if (!mDocument->IsResourceDoc()) {
// Notify observers that a new page is about to be drawn. Execute this
// as soon as it is safe to run JS, which is guaranteed to be before we
// go back to the event loop and actually draw the page.
MOZ_LOG(gLog, LogLevel::Debug,
("PresShell::ScheduleBeforeFirstPaint this=%p", this));
nsContentUtils::AddScriptRunner(new nsBeforeFirstPaintDispatcher(mDocument));
}
}
void
PresShell::UnsuppressAndInvalidate()
{
// Note: We ignore the EnsureVisible check for resource documents, because
// they won't have a docshell, so they'll always fail EnsureVisible.
if ((!mDocument->IsResourceDoc() && !mPresContext->EnsureVisible()) ||
mHaveShutDown) {
// No point; we're about to be torn down anyway.
return;
}
ScheduleBeforeFirstPaint();
mPaintingSuppressed = false;
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (rootFrame) {
// let's assume that outline on a root frame is not supported
rootFrame->InvalidateFrame();
}
// now that painting is unsuppressed, focus may be set on the document
if (nsPIDOMWindowOuter* win = mDocument->GetWindow())
win->SetReadyForFocus();
if (!mHaveShutDown) {
SynthesizeMouseMove(false);
ScheduleApproximateFrameVisibilityUpdateNow();
}
}
void
PresShell::UnsuppressPainting()
{
if (mPaintSuppressionTimer) {
mPaintSuppressionTimer->Cancel();
mPaintSuppressionTimer = nullptr;
}
if (mIsDocumentGone || !mPaintingSuppressed)
return;
// If we have reflows pending, just wait until we process
// the reflows and get all the frames where we want them
// before actually unlocking the painting. Otherwise
// go ahead and unlock now.
if (!mDirtyRoots.IsEmpty())
mShouldUnsuppressPainting = true;
else
UnsuppressAndInvalidate();
}
// Post a request to handle an arbitrary callback after reflow has finished.
nsresult
PresShell::PostReflowCallback(nsIReflowCallback* aCallback)
{
void* result = AllocateByObjectID(eArenaObjectID_nsCallbackEventRequest,
sizeof(nsCallbackEventRequest));
nsCallbackEventRequest* request = (nsCallbackEventRequest*)result;
request->callback = aCallback;
request->next = nullptr;
if (mLastCallbackEventRequest) {
mLastCallbackEventRequest = mLastCallbackEventRequest->next = request;
} else {
mFirstCallbackEventRequest = request;
mLastCallbackEventRequest = request;
}
return NS_OK;
}
void
PresShell::CancelReflowCallback(nsIReflowCallback* aCallback)
{
nsCallbackEventRequest* before = nullptr;
nsCallbackEventRequest* node = mFirstCallbackEventRequest;
while(node)
{
nsIReflowCallback* callback = node->callback;
if (callback == aCallback)
{
nsCallbackEventRequest* toFree = node;
if (node == mFirstCallbackEventRequest) {
node = node->next;
mFirstCallbackEventRequest = node;
NS_ASSERTION(before == nullptr, "impossible");
} else {
node = node->next;
before->next = node;
}
if (toFree == mLastCallbackEventRequest) {
mLastCallbackEventRequest = before;
}
FreeByObjectID(eArenaObjectID_nsCallbackEventRequest, toFree);
} else {
before = node;
node = node->next;
}
}
}
void
PresShell::CancelPostedReflowCallbacks()
{
while (mFirstCallbackEventRequest) {
nsCallbackEventRequest* node = mFirstCallbackEventRequest;
mFirstCallbackEventRequest = node->next;
if (!mFirstCallbackEventRequest) {
mLastCallbackEventRequest = nullptr;
}
nsIReflowCallback* callback = node->callback;
FreeByObjectID(eArenaObjectID_nsCallbackEventRequest, node);
if (callback) {
callback->ReflowCallbackCanceled();
}
}
}
void
PresShell::HandlePostedReflowCallbacks(bool aInterruptible)
{
bool shouldFlush = false;
while (mFirstCallbackEventRequest) {
nsCallbackEventRequest* node = mFirstCallbackEventRequest;
mFirstCallbackEventRequest = node->next;
if (!mFirstCallbackEventRequest) {
mLastCallbackEventRequest = nullptr;
}
nsIReflowCallback* callback = node->callback;
FreeByObjectID(eArenaObjectID_nsCallbackEventRequest, node);
if (callback) {
if (callback->ReflowFinished()) {
shouldFlush = true;
}
}
}
FlushType flushType =
aInterruptible ? FlushType::InterruptibleLayout : FlushType::Layout;
if (shouldFlush && !mIsDestroying) {
FlushPendingNotifications(flushType);
}
}
bool
nsIPresShell::IsSafeToFlush() const
{
// Not safe if we are getting torn down, reflowing, or in the middle of frame
// construction.
if (mIsReflowing || mChangeNestCount || mIsDestroying) {
return false;
}
// Not safe if we are painting
if (nsViewManager* viewManager = GetViewManager()) {
bool isPainting = false;
viewManager->IsPainting(isPainting);
if (isPainting) {
return false;
}
}
return true;
}
void
nsIPresShell::NotifyFontFaceSetOnRefresh()
{
if (FontFaceSet* set = mDocument->GetFonts()) {
set->DidRefresh();
}
}
void
PresShell::DoFlushPendingNotifications(FlushType aType)
{
// by default, flush animations if aType >= FlushType::Style
mozilla::ChangesToFlush flush(aType, aType >= FlushType::Style);
FlushPendingNotifications(flush);
}
#ifdef DEBUG
static void
AssertFrameSubtreeIsSane(const nsIFrame& aRoot)
{
if (const nsIContent* content = aRoot.GetContent()) {
MOZ_ASSERT(content->GetFlattenedTreeParentNodeForStyle(),
"Node not in the flattened tree still has a frame?");
}
nsIFrame::ChildListIterator childLists(&aRoot);
for (; !childLists.IsDone(); childLists.Next()) {
for (const nsIFrame* child : childLists.CurrentList()) {
AssertFrameSubtreeIsSane(*child);
}
}
}
#endif
static inline void
AssertFrameTreeIsSane(const nsIPresShell& aShell)
{
#ifdef DEBUG
if (const nsIFrame* root = aShell.GetRootFrame()) {
AssertFrameSubtreeIsSane(*root);
}
#endif
}
void
PresShell::DoFlushPendingNotifications(mozilla::ChangesToFlush aFlush)
{
// Per our API contract, hold a strong ref to ourselves until we return.
nsCOMPtr<nsIPresShell> kungFuDeathGrip = this;
/**
* VERY IMPORTANT: If you add some sort of new flushing to this
* method, make sure to add the relevant SetNeedLayoutFlush or
* SetNeedStyleFlush calls on the shell.
*/
FlushType flushType = aFlush.mFlushType;
MOZ_ASSERT(NeedFlush(flushType), "Why did we get called?");
#ifdef MOZ_GECKO_PROFILER
static const EnumeratedArray<FlushType,
FlushType::Count,
const char*> flushTypeNames = {
"",
"Event",
"Content",
"ContentAndNotify",
// As far as the profiler is concerned, EnsurePresShellInitAndFrames and
// Frames are the same
"Style",
"Style",
"InterruptibleLayout",
"Layout",
"Display"
};
AUTO_PROFILER_LABEL_DYNAMIC_CSTR("PresShell::DoFlushPendingNotifications",
LAYOUT, flushTypeNames[flushType]);
#endif
#ifdef ACCESSIBILITY
#ifdef DEBUG
if (nsAccessibilityService* accService = GetAccService()) {
NS_ASSERTION(!accService->IsProcessingRefreshDriverNotification(),
"Flush during accessible tree update!");
}
#endif
#endif
NS_ASSERTION(flushType >= FlushType::Frames, "Why did we get called?");
mNeedStyleFlush = false;
mNeedThrottledAnimationFlush =
mNeedThrottledAnimationFlush && !aFlush.mFlushAnimations;
mNeedLayoutFlush =
mNeedLayoutFlush && (flushType < FlushType::InterruptibleLayout);
bool isSafeToFlush = IsSafeToFlush();
// If layout could possibly trigger scripts, then it's only safe to flush if
// it's safe to run script.
bool hasHadScriptObject;
if (mDocument->GetScriptHandlingObject(hasHadScriptObject) ||
hasHadScriptObject) {
isSafeToFlush = isSafeToFlush && nsContentUtils::IsSafeToRunScript();
}
MOZ_DIAGNOSTIC_ASSERT(!mIsDestroying || !isSafeToFlush);
MOZ_DIAGNOSTIC_ASSERT(mIsDestroying || mViewManager);
MOZ_DIAGNOSTIC_ASSERT(mIsDestroying || mDocument->HasShellOrBFCacheEntry());
MOZ_DIAGNOSTIC_ASSERT(mIsDestroying || mDocument->GetShell() == this);
// Make sure the view manager stays alive.
RefPtr<nsViewManager> viewManager = mViewManager;
bool didStyleFlush = false;
bool didLayoutFlush = false;
if (isSafeToFlush) {
// Record that we are in a flush, so that our optimization in
// nsDocument::FlushPendingNotifications doesn't skip any re-entrant
// calls to us. Otherwise, we might miss some needed flushes, since
// we clear mNeedStyleFlush / mNeedLayoutFlush here at the top of
// the function but we might not have done the work yet.
AutoRestore<bool> guard(mInFlush);
mInFlush = true;
// We need to make sure external resource documents are flushed too (for
// example, svg filters that reference a filter in an external document
// need the frames in the external document to be constructed for the
// filter to work). We only need external resources to be flushed when the
// main document is flushing >= FlushType::Frames, so we flush external
// resources here instead of nsDocument::FlushPendingNotifications.
mDocument->FlushExternalResources(flushType);
// Force flushing of any pending content notifications that might have
// queued up while our event was pending. That will ensure that we don't
// construct frames for content right now that's still waiting to be
// notified on,
mDocument->FlushPendingNotifications(FlushType::ContentAndNotify);
mDocument->UpdateSVGUseElementShadowTrees();
// Process pending restyles, since any flush of the presshell wants
// up-to-date style data.
if (MOZ_LIKELY(!mIsDestroying)) {
viewManager->FlushDelayedResize(false);
mPresContext->FlushPendingMediaFeatureValuesChanged();
}
if (MOZ_LIKELY(!mIsDestroying)) {
// Now that we have flushed media queries, update the rules before looking
// up @font-face / @counter-style / @font-feature-values rules.
mStyleSet->UpdateStylistIfNeeded();
// Flush any pending update of the user font set, since that could
// cause style changes (for updating ex/ch units, and to cause a
// reflow).
mDocument->FlushUserFontSet();
mPresContext->FlushCounterStyles();
mPresContext->FlushFontFeatureValues();
// Flush any requested SMIL samples.
if (mDocument->HasAnimationController()) {
mDocument->GetAnimationController()->FlushResampleRequests();
}
if (aFlush.mFlushAnimations && mPresContext->EffectCompositor()) {
mPresContext->EffectCompositor()->PostRestyleForThrottledAnimations();
}
}
// The FlushResampleRequests() above flushed style changes.
if (MOZ_LIKELY(!mIsDestroying)) {
nsAutoScriptBlocker scriptBlocker;
#ifdef MOZ_GECKO_PROFILER
AutoProfilerStyleMarker tracingStyleFlush(std::move(mStyleCause));
#endif
mPresContext->RestyleManager()->ProcessPendingRestyles();
}
// Process whatever XBL constructors those restyles queued up. This
// ensures that onload doesn't fire too early and that we won't do extra
// reflows after those constructors run.
if (MOZ_LIKELY(!mIsDestroying)) {
mDocument->BindingManager()->ProcessAttachedQueue();
}
// Now those constructors or events might have posted restyle
// events. At the same time, we still need up-to-date style data.
// In particular, reflow depends on style being completely up to
// date. If it's not, then style reparenting, which can
// happen during reflow, might suddenly pick up the new rules and
// we'll end up with frames whose style doesn't match the frame
// type.
if (MOZ_LIKELY(!mIsDestroying)) {
nsAutoScriptBlocker scriptBlocker;
#ifdef MOZ_GECKO_PROFILER
AutoProfilerStyleMarker tracingStyleFlush(std::move(mStyleCause));
#endif
mPresContext->RestyleManager()->ProcessPendingRestyles();
// Clear mNeedStyleFlush here agagin to make this flag work properly for
// optimization since the flag might have set in ProcessPendingRestyles().
mNeedStyleFlush = false;
}
AssertFrameTreeIsSane(*this);
didStyleFlush = true;
// There might be more pending constructors now, but we're not going to
// worry about them. They can't be triggered during reflow, so we should
// be good.
if (flushType >= (SuppressInterruptibleReflows()
? FlushType::Layout
: FlushType::InterruptibleLayout) &&
!mIsDestroying) {
didLayoutFlush = true;
mFrameConstructor->RecalcQuotesAndCounters();
viewManager->FlushDelayedResize(true);
if (ProcessReflowCommands(flushType < FlushType::Layout) &&
mContentToScrollTo) {
// We didn't get interrupted. Go ahead and scroll to our content
DoScrollContentIntoView();
if (mContentToScrollTo) {
mContentToScrollTo->DeleteProperty(nsGkAtoms::scrolling);
mContentToScrollTo = nullptr;
}
}
}
if (flushType >= FlushType::Layout) {
if (!mIsDestroying) {
viewManager->UpdateWidgetGeometry();
}
}
}
if (!didStyleFlush && flushType >= FlushType::Style && !mIsDestroying) {
SetNeedStyleFlush();
if (aFlush.mFlushAnimations) {
SetNeedThrottledAnimationFlush();
}
}
if (!didLayoutFlush && flushType >= FlushType::InterruptibleLayout &&
!mIsDestroying) {
// We suppressed this flush either due to it not being safe to flush,
// or due to SuppressInterruptibleReflows(). Either way, the
// mNeedLayoutFlush flag needs to be re-set.
SetNeedLayoutFlush();
}
}
void
PresShell::CharacterDataChanged(nsIContent* aContent,
const CharacterDataChangeInfo& aInfo)
{
MOZ_ASSERT(!mIsDocumentGone, "Unexpected CharacterDataChanged");
MOZ_ASSERT(aContent->OwnerDoc() == mDocument, "Unexpected document");
nsAutoCauseReflowNotifier crNotifier(this);
mPresContext->RestyleManager()->CharacterDataChanged(aContent, aInfo);
mFrameConstructor->CharacterDataChanged(aContent, aInfo);
}
void
PresShell::ContentStateChanged(nsIDocument* aDocument,
nsIContent* aContent,
EventStates aStateMask)
{
MOZ_ASSERT(!mIsDocumentGone, "Unexpected ContentStateChanged");
MOZ_ASSERT(aDocument == mDocument, "Unexpected aDocument");
if (mDidInitialize) {
nsAutoCauseReflowNotifier crNotifier(this);
mPresContext->RestyleManager()->ContentStateChanged(aContent, aStateMask);
}
}
void
PresShell::DocumentStatesChanged(nsIDocument* aDocument, EventStates aStateMask)
{
MOZ_ASSERT(!mIsDocumentGone, "Unexpected DocumentStatesChanged");
MOZ_ASSERT(aDocument == mDocument, "Unexpected aDocument");
MOZ_ASSERT(!aStateMask.IsEmpty());
if (mDidInitialize) {
mStyleSet->InvalidateStyleForDocumentStateChanges(aStateMask);
}
if (aStateMask.HasState(NS_DOCUMENT_STATE_WINDOW_INACTIVE)) {
if (nsIFrame* root = mFrameConstructor->GetRootFrame()) {
root->SchedulePaint();
}
}
}
void
PresShell::AttributeWillChange(Element* aElement,
int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aNewValue)
{
MOZ_ASSERT(!mIsDocumentGone, "Unexpected AttributeWillChange");
MOZ_ASSERT(aElement->OwnerDoc() == mDocument, "Unexpected document");
// XXXwaterson it might be more elegant to wait until after the
// initial reflow to begin observing the document. That would
// squelch any other inappropriate notifications as well.
if (mDidInitialize) {
nsAutoCauseReflowNotifier crNotifier(this);
mPresContext->RestyleManager()->AttributeWillChange(aElement, aNameSpaceID,
aAttribute, aModType,
aNewValue);
}
}
void
PresShell::AttributeChanged(Element* aElement,
int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aOldValue)
{
MOZ_ASSERT(!mIsDocumentGone, "Unexpected AttributeChanged");
MOZ_ASSERT(aElement->OwnerDoc() == mDocument, "Unexpected document");
// XXXwaterson it might be more elegant to wait until after the
// initial reflow to begin observing the document. That would
// squelch any other inappropriate notifications as well.
if (mDidInitialize) {
nsAutoCauseReflowNotifier crNotifier(this);
mPresContext->RestyleManager()->AttributeChanged(aElement, aNameSpaceID,
aAttribute, aModType,
aOldValue);
}
}
void
PresShell::ContentAppended(nsIContent* aFirstNewContent)
{
MOZ_ASSERT(!mIsDocumentGone, "Unexpected ContentAppended");
MOZ_ASSERT(aFirstNewContent->OwnerDoc() == mDocument,
"Unexpected document");
// We never call ContentAppended with a document as the container, so we can
// assert that we have an nsIContent parent.
MOZ_ASSERT(aFirstNewContent->GetParent());
MOZ_ASSERT(aFirstNewContent->GetParent()->IsElement() ||
aFirstNewContent->GetParent()->IsShadowRoot());
if (!mDidInitialize) {
return;
}
nsAutoCauseReflowNotifier crNotifier(this);
// Call this here so it only happens for real content mutations and
// not cases when the frame constructor calls its own methods to force
// frame reconstruction.
mPresContext->RestyleManager()->ContentAppended(aFirstNewContent);
mFrameConstructor->ContentAppended(
aFirstNewContent,
nsCSSFrameConstructor::InsertionKind::Async);
}
void
PresShell::ContentInserted(nsIContent* aChild)
{
MOZ_ASSERT(!mIsDocumentGone, "Unexpected ContentInserted");
MOZ_ASSERT(aChild->OwnerDoc() == mDocument, "Unexpected document");
if (!mDidInitialize) {
return;
}
nsAutoCauseReflowNotifier crNotifier(this);
// Call this here so it only happens for real content mutations and
// not cases when the frame constructor calls its own methods to force
// frame reconstruction.
mPresContext->RestyleManager()->ContentInserted(aChild);
mFrameConstructor->ContentInserted(
aChild,
nullptr,
nsCSSFrameConstructor::InsertionKind::Async);
}
void
PresShell::ContentRemoved(nsIContent* aChild, nsIContent* aPreviousSibling)
{
MOZ_ASSERT(!mIsDocumentGone, "Unexpected ContentRemoved");
MOZ_ASSERT(aChild->OwnerDoc() == mDocument, "Unexpected document");
nsINode* container = aChild->GetParentNode();
// Notify the ESM that the content has been removed, so that
// it can clean up any state related to the content.
mPresContext->EventStateManager()->ContentRemoved(mDocument, aChild);
nsAutoCauseReflowNotifier crNotifier(this);
// Call this here so it only happens for real content mutations and
// not cases when the frame constructor calls its own methods to force
// frame reconstruction.
nsIContent* oldNextSibling = nullptr;
// Editor calls into here with NAC via HTMLEditor::DeleteRefToAnonymousNode.
// This could be asserted if that caller is fixed.
if (MOZ_LIKELY(!aChild->IsRootOfAnonymousSubtree())) {
oldNextSibling = aPreviousSibling
? aPreviousSibling->GetNextSibling()
: container->GetFirstChild();
}
// After removing aChild from tree we should save information about live ancestor
if (mPointerEventTarget &&
nsContentUtils::ContentIsDescendantOf(mPointerEventTarget, aChild)) {
mPointerEventTarget = aChild->GetParent();
}
mFrameConstructor->ContentRemoved(aChild,
oldNextSibling,
nsCSSFrameConstructor::REMOVE_CONTENT);
// NOTE(emilio): It's important that this goes after the frame constructor
// stuff, otherwise the frame constructor can't see elements which are
// display: contents / display: none, because we'd have cleared all the style
// data from there.
mPresContext->RestyleManager()->ContentRemoved(aChild, oldNextSibling);
}
void
PresShell::NotifyCounterStylesAreDirty()
{
nsAutoCauseReflowNotifier reflowNotifier(this);
mFrameConstructor->NotifyCounterStylesAreDirty();
}
bool
nsIPresShell::FrameIsAncestorOfDirtyRoot(nsIFrame* aFrame) const
{
MOZ_ASSERT(aFrame);
// Look for a path from any dirty roots to aFrame, following GetParent().
// This check mirrors what FrameNeedsReflow() would have done if the reflow
// root didn't get in the way.
for (nsIFrame* dirtyFrame : mDirtyRoots) {
while (dirtyFrame) {
if (dirtyFrame == aFrame) {
return true;
}
dirtyFrame = dirtyFrame->GetParent();
}
}
return false;
}
void
PresShell::ReconstructFrames()
{
MOZ_ASSERT(!mFrameConstructor->GetRootFrame() || mDidInitialize,
"Must not have root frame before initial reflow");
if (!mDidInitialize || mIsDestroying) {
// Nothing to do here
return;
}
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
// Have to make sure that the content notifications are flushed before we
// start messing with the frame model; otherwise we can get content doubling.
//
// Also make sure that styles are flushed before calling into the frame
// constructor, since that's what it expects.
mDocument->FlushPendingNotifications(FlushType::Style);
if (mIsDestroying) {
return;
}
nsAutoCauseReflowNotifier crNotifier(this);
mFrameConstructor->ReconstructDocElementHierarchy(nsCSSFrameConstructor::InsertionKind::Sync);
}
void
nsIPresShell::ApplicableStylesChanged()
{
if (mIsDestroying) {
// We don't want to mess with restyles at this point
return;
}
EnsureStyleFlush();
mDocument->MarkUserFontSetDirty();
if (mPresContext) {
mPresContext->MarkCounterStylesDirty();
mPresContext->MarkFontFeatureValuesDirty();
mPresContext->RestyleManager()->NextRestyleIsForCSSRuleChanges();
}
}
nsresult
PresShell::RenderDocument(const nsRect& aRect, uint32_t aFlags,
nscolor aBackgroundColor,
gfxContext* aThebesContext)
{
NS_ENSURE_TRUE(!(aFlags & RENDER_IS_UNTRUSTED), NS_ERROR_NOT_IMPLEMENTED);
nsRootPresContext* rootPresContext = mPresContext->GetRootPresContext();
if (rootPresContext) {
rootPresContext->FlushWillPaintObservers();
if (mIsDestroying)
return NS_OK;
}
nsAutoScriptBlocker blockScripts;
// Set up the rectangle as the path in aThebesContext
gfxRect r(0, 0,
nsPresContext::AppUnitsToFloatCSSPixels(aRect.width),
nsPresContext::AppUnitsToFloatCSSPixels(aRect.height));
aThebesContext->NewPath();
#ifdef MOZ_GFX_OPTIMIZE_MOBILE
aThebesContext->Rectangle(r, true);
#else
aThebesContext->Rectangle(r);
#endif
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (!rootFrame) {
// Nothing to paint, just fill the rect
aThebesContext->SetColor(Color::FromABGR(aBackgroundColor));
aThebesContext->Fill();
return NS_OK;
}
gfxContextAutoSaveRestore save(aThebesContext);
MOZ_ASSERT(aThebesContext->CurrentOp() == CompositionOp::OP_OVER);
aThebesContext->Clip();
nsDeviceContext* devCtx = mPresContext->DeviceContext();
gfxPoint offset(-nsPresContext::AppUnitsToFloatCSSPixels(aRect.x),
-nsPresContext::AppUnitsToFloatCSSPixels(aRect.y));
gfxFloat scale = gfxFloat(devCtx->AppUnitsPerDevPixel())/AppUnitsPerCSSPixel();
// Since canvas APIs use floats to set up their matrices, we may have some
// slight rounding errors here. We use NudgeToIntegers() here to adjust
// matrix components that are integers up to the accuracy of floats to be
// those integers.
gfxMatrix newTM = aThebesContext->CurrentMatrixDouble().PreTranslate(offset).
PreScale(scale, scale).
NudgeToIntegers();
aThebesContext->SetMatrixDouble(newTM);
AutoSaveRestoreRenderingState _(this);
bool wouldFlushRetainedLayers = false;
PaintFrameFlags flags = PaintFrameFlags::PAINT_IGNORE_SUPPRESSION;
if (aThebesContext->CurrentMatrix().HasNonIntegerTranslation()) {
flags |= PaintFrameFlags::PAINT_IN_TRANSFORM;
}
if (!(aFlags & RENDER_ASYNC_DECODE_IMAGES)) {
flags |= PaintFrameFlags::PAINT_SYNC_DECODE_IMAGES;
}
if (aFlags & RENDER_USE_WIDGET_LAYERS) {
// We only support using widget layers on display root's with widgets.
nsView* view = rootFrame->GetView();
if (view && view->GetWidget() &&
nsLayoutUtils::GetDisplayRootFrame(rootFrame) == rootFrame) {
LayerManager* layerManager = view->GetWidget()->GetLayerManager();
// ClientLayerManagers or WebRenderLayerManagers in content processes
// don't support taking snapshots.
if (layerManager &&
(!layerManager->AsKnowsCompositor() ||
XRE_IsParentProcess())) {
flags |= PaintFrameFlags::PAINT_WIDGET_LAYERS;
}
}
}
if (!(aFlags & RENDER_CARET)) {
wouldFlushRetainedLayers = true;
flags |= PaintFrameFlags::PAINT_HIDE_CARET;
}
if (aFlags & RENDER_IGNORE_VIEWPORT_SCROLLING) {
wouldFlushRetainedLayers = !IgnoringViewportScrolling();
mRenderFlags = ChangeFlag(mRenderFlags, true, STATE_IGNORING_VIEWPORT_SCROLLING);
}
if (aFlags & RENDER_DRAWWINDOW_NOT_FLUSHING) {
mRenderFlags = ChangeFlag(mRenderFlags, true, STATE_DRAWWINDOW_NOT_FLUSHING);
}
if (aFlags & RENDER_DOCUMENT_RELATIVE) {
// XXX be smarter about this ... drawWindow might want a rect
// that's "pretty close" to what our retained layer tree covers.
// In that case, it wouldn't disturb normal rendering too much,
// and we should allow it.
wouldFlushRetainedLayers = true;
flags |= PaintFrameFlags::PAINT_DOCUMENT_RELATIVE;
}
// Don't let drawWindow blow away our retained layer tree
if ((flags & PaintFrameFlags::PAINT_WIDGET_LAYERS) && wouldFlushRetainedLayers) {
flags &= ~PaintFrameFlags::PAINT_WIDGET_LAYERS;
}
nsLayoutUtils::PaintFrame(aThebesContext, rootFrame, nsRegion(aRect),
aBackgroundColor,
nsDisplayListBuilderMode::PAINTING,
flags);
return NS_OK;
}
/*
* Clip the display list aList to a range. Returns the clipped
* rectangle surrounding the range.
*/
nsRect
PresShell::ClipListToRange(nsDisplayListBuilder *aBuilder,
nsDisplayList* aList,
nsRange* aRange)
{
// iterate though the display items and add up the bounding boxes of each.
// This will allow the total area of the frames within the range to be
// determined. To do this, remove an item from the bottom of the list, check
// whether it should be part of the range, and if so, append it to the top
// of the temporary list tmpList. If the item is a text frame at the end of
// the selection range, clip it to the portion of the text frame that is
// part of the selection. Then, append the wrapper to the top of the list.
// Otherwise, just delete the item and don't append it.
nsRect surfaceRect;
nsDisplayList tmpList;
nsDisplayItem* i;
while ((i = aList->RemoveBottom())) {
// itemToInsert indiciates the item that should be inserted into the
// temporary list. If null, no item should be inserted.
nsDisplayItem* itemToInsert = nullptr;
nsIFrame* frame = i->Frame();
nsIContent* content = frame->GetContent();
if (content) {
bool atStart = (content == aRange->GetStartContainer());
bool atEnd = (content == aRange->GetEndContainer());
if ((atStart || atEnd) && frame->IsTextFrame()) {
int32_t frameStartOffset, frameEndOffset;
frame->GetOffsets(frameStartOffset, frameEndOffset);
int32_t hilightStart =
atStart ? std::max(static_cast<int32_t>(aRange->StartOffset()),
frameStartOffset) : frameStartOffset;
int32_t hilightEnd =
atEnd ? std::min(static_cast<int32_t>(aRange->EndOffset()),
frameEndOffset) : frameEndOffset;
if (hilightStart < hilightEnd) {
// determine the location of the start and end edges of the range.
nsPoint startPoint, endPoint;
frame->GetPointFromOffset(hilightStart, &startPoint);
frame->GetPointFromOffset(hilightEnd, &endPoint);
// The clip rectangle is determined by taking the the start and
// end points of the range, offset from the reference frame.
// Because of rtl, the end point may be to the left of (or above,
// in vertical mode) the start point, so x (or y) is set to the
// lower of the values.
nsRect textRect(aBuilder->ToReferenceFrame(frame), frame->GetSize());
if (frame->GetWritingMode().IsVertical()) {
nscoord y = std::min(startPoint.y, endPoint.y);
textRect.y += y;
textRect.height = std::max(startPoint.y, endPoint.y) - y;
} else {
nscoord x = std::min(startPoint.x, endPoint.x);
textRect.x += x;
textRect.width = std::max(startPoint.x, endPoint.x) - x;
}
surfaceRect.UnionRect(surfaceRect, textRect);
const ActiveScrolledRoot* asr = i->GetActiveScrolledRoot();
DisplayItemClip newClip;
newClip.SetTo(textRect);
const DisplayItemClipChain* newClipChain =
aBuilder->AllocateDisplayItemClipChain(newClip, asr, nullptr);
i->IntersectClip(aBuilder, newClipChain, true);
itemToInsert = i;
}
}
// Don't try to descend into subdocuments.
// If this ever changes we'd need to add handling for subdocuments with
// different zoom levels.
else if (content->GetUncomposedDoc() ==
aRange->GetStartContainer()->GetUncomposedDoc()) {
// if the node is within the range, append it to the temporary list
bool before, after;
nsresult rv =
nsRange::CompareNodeToRange(content, aRange, &before, &after);
if (NS_SUCCEEDED(rv) && !before && !after) {
itemToInsert = i;
bool snap;
surfaceRect.UnionRect(surfaceRect, i->GetBounds(aBuilder, &snap));
}
}
}
// insert the item into the list if necessary. If the item has a child
// list, insert that as well
nsDisplayList* sublist = i->GetSameCoordinateSystemChildren();
if (itemToInsert || sublist) {
tmpList.AppendToTop(itemToInsert ? itemToInsert : i);
// if the item is a list, iterate over it as well
if (sublist)
surfaceRect.UnionRect(surfaceRect,
ClipListToRange(aBuilder, sublist, aRange));
}
else {
// otherwise, just delete the item and don't readd it to the list
i->Destroy(aBuilder);
}
}
// now add all the items back onto the original list again
aList->AppendToTop(&tmpList);
return surfaceRect;
}
#ifdef DEBUG
#include <stdio.h>
static bool gDumpRangePaintList = false;
#endif
UniquePtr<RangePaintInfo>
PresShell::CreateRangePaintInfo(nsRange* aRange,
nsRect& aSurfaceRect,
bool aForPrimarySelection)
{
nsIFrame* ancestorFrame;
nsIFrame* rootFrame = GetRootFrame();
// If the start or end of the range is the document, just use the root
// frame, otherwise get the common ancestor of the two endpoints of the
// range.
nsINode* startContainer = aRange->GetStartContainer();
nsINode* endContainer = aRange->GetEndContainer();
nsIDocument* doc = startContainer->GetComposedDoc();
if (startContainer == doc || endContainer == doc) {
ancestorFrame = rootFrame;
} else {
nsINode* ancestor =
nsContentUtils::GetCommonAncestor(startContainer, endContainer);
NS_ASSERTION(!ancestor || ancestor->IsContent(),
"common ancestor is not content");
if (!ancestor || !ancestor->IsContent())
return nullptr;
ancestorFrame = ancestor->AsContent()->GetPrimaryFrame();
// XXX deal with ancestorFrame being null due to display:contents
// use the nearest ancestor frame that includes all continuations as the
// root for building the display list
while (ancestorFrame &&
nsLayoutUtils::GetNextContinuationOrIBSplitSibling(ancestorFrame))
ancestorFrame = ancestorFrame->GetParent();
}
if (!ancestorFrame) {
return nullptr;
}
// get a display list containing the range
auto info = MakeUnique<RangePaintInfo>(aRange, ancestorFrame);
info->mBuilder.SetIncludeAllOutOfFlows();
if (aForPrimarySelection) {
info->mBuilder.SetSelectedFramesOnly();
}
info->mBuilder.EnterPresShell(ancestorFrame);
nsCOMPtr<nsIContentIterator> iter = NS_NewContentSubtreeIterator();
nsresult rv = iter->Init(aRange);
if (NS_FAILED(rv)) {
return nullptr;
}
auto BuildDisplayListForNode = [&] (nsINode* aNode) {
if (MOZ_UNLIKELY(!aNode->IsContent())) {
return;
}
nsIFrame* frame = aNode->AsContent()->GetPrimaryFrame();
// XXX deal with frame being null due to display:contents
for (; frame; frame = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(frame)) {
info->mBuilder.SetVisibleRect(frame->GetVisualOverflowRect());
info->mBuilder.SetDirtyRect(frame->GetVisualOverflowRect());
frame->BuildDisplayListForStackingContext(&info->mBuilder, &info->mList);
}
};
if (startContainer->NodeType() == nsINode::TEXT_NODE) {
BuildDisplayListForNode(startContainer);
}
for (; !iter->IsDone(); iter->Next()) {
nsCOMPtr<nsINode> node = iter->GetCurrentNode();
BuildDisplayListForNode(node);
}
if (endContainer != startContainer &&
endContainer->NodeType() == nsINode::TEXT_NODE) {
BuildDisplayListForNode(endContainer);
}
#ifdef DEBUG
if (gDumpRangePaintList) {
fprintf(stderr, "CreateRangePaintInfo --- before ClipListToRange:\n");
nsFrame::PrintDisplayList(&(info->mBuilder), info->mList);
}
#endif
nsRect rangeRect = ClipListToRange(&info->mBuilder, &info->mList, aRange);
info->mBuilder.LeavePresShell(ancestorFrame, &info->mList);
#ifdef DEBUG
if (gDumpRangePaintList) {
fprintf(stderr, "CreateRangePaintInfo --- after ClipListToRange:\n");
nsFrame::PrintDisplayList(&(info->mBuilder), info->mList);
}
#endif
// determine the offset of the reference frame for the display list
// to the root frame. This will allow the coordinates used when painting
// to all be offset from the same point
info->mRootOffset = ancestorFrame->GetOffsetTo(rootFrame);
rangeRect.MoveBy(info->mRootOffset);
aSurfaceRect.UnionRect(aSurfaceRect, rangeRect);
return info;
}
already_AddRefed<SourceSurface>
PresShell::PaintRangePaintInfo(const nsTArray<UniquePtr<RangePaintInfo>>& aItems,
Selection* aSelection,
const Maybe<CSSIntRegion>& aRegion,
nsRect aArea,
const LayoutDeviceIntPoint aPoint,
LayoutDeviceIntRect* aScreenRect,
uint32_t aFlags)
{
nsPresContext* pc = GetPresContext();
if (!pc || aArea.width == 0 || aArea.height == 0)
return nullptr;
// use the rectangle to create the surface
nsIntRect pixelArea = aArea.ToOutsidePixels(pc->AppUnitsPerDevPixel());
// if the image should not be resized, scale must be 1
float scale = 1.0;
nsIntRect rootScreenRect =
GetRootFrame()->GetScreenRectInAppUnits().ToNearestPixels(
pc->AppUnitsPerDevPixel());
nsRect maxSize;
pc->DeviceContext()->GetClientRect(maxSize);
// check if the image should be resized
bool resize = aFlags & RENDER_AUTO_SCALE;
if (resize) {
// check if image-resizing-algorithm should be used
if (aFlags & RENDER_IS_IMAGE) {
// get max screensize
nscoord maxWidth = pc->AppUnitsToDevPixels(maxSize.width);
nscoord maxHeight = pc->AppUnitsToDevPixels(maxSize.height);
// resize image relative to the screensize
// get best height/width relative to screensize
float bestHeight = float(maxHeight)*RELATIVE_SCALEFACTOR;
float bestWidth = float(maxWidth)*RELATIVE_SCALEFACTOR;
// calculate scale for bestWidth
float adjustedScale = bestWidth / float(pixelArea.width);
// get the worst height (height when width is perfect)
float worstHeight = float(pixelArea.height)*adjustedScale;
// get the difference of best and worst height
float difference = bestHeight - worstHeight;
// halve the difference and add it to worstHeight to get
// the best compromise between bestHeight and bestWidth,
// then calculate the corresponding scale factor
adjustedScale = (worstHeight + difference / 2) / float(pixelArea.height);
// prevent upscaling
scale = std::min(scale, adjustedScale);
} else {
// get half of max screensize
nscoord maxWidth = pc->AppUnitsToDevPixels(maxSize.width >> 1);
nscoord maxHeight = pc->AppUnitsToDevPixels(maxSize.height >> 1);
if (pixelArea.width > maxWidth || pixelArea.height > maxHeight) {
// divide the maximum size by the image size in both directions. Whichever
// direction produces the smallest result determines how much should be
// scaled.
if (pixelArea.width > maxWidth)
scale = std::min(scale, float(maxWidth) / pixelArea.width);
if (pixelArea.height > maxHeight)
scale = std::min(scale, float(maxHeight) / pixelArea.height);
}
}
pixelArea.width = NSToIntFloor(float(pixelArea.width) * scale);
pixelArea.height = NSToIntFloor(float(pixelArea.height) * scale);
if (!pixelArea.width || !pixelArea.height)
return nullptr;
// adjust the screen position based on the rescaled size
nscoord left = rootScreenRect.x + pixelArea.x;
nscoord top = rootScreenRect.y + pixelArea.y;
aScreenRect->x = NSToIntFloor(aPoint.x - float(aPoint.x - left) * scale);
aScreenRect->y = NSToIntFloor(aPoint.y - float(aPoint.y - top) * scale);
}
else {
// move aScreenRect to the position of the surface in screen coordinates
aScreenRect->MoveTo(rootScreenRect.x + pixelArea.x, rootScreenRect.y + pixelArea.y);
}
aScreenRect->width = pixelArea.width;
aScreenRect->height = pixelArea.height;
RefPtr<DrawTarget> dt =
gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
IntSize(pixelArea.width, pixelArea.height),
SurfaceFormat::B8G8R8A8);
if (!dt || !dt->IsValid()) {
return nullptr;
}
RefPtr<gfxContext> ctx = gfxContext::CreateOrNull(dt);
MOZ_ASSERT(ctx); // already checked the draw target above
if (aRegion) {
RefPtr<PathBuilder> builder = dt->CreatePathBuilder(FillRule::FILL_WINDING);
// Convert aRegion from CSS pixels to dev pixels
nsIntRegion region =
aRegion->ToAppUnits(AppUnitsPerCSSPixel())
.ToOutsidePixels(pc->AppUnitsPerDevPixel());
for (auto iter = region.RectIter(); !iter.Done(); iter.Next()) {
const IntRect& rect = iter.Get();
builder->MoveTo(rect.TopLeft());
builder->LineTo(rect.TopRight());
builder->LineTo(rect.BottomRight());
builder->LineTo(rect.BottomLeft());
builder->LineTo(rect.TopLeft());
}
RefPtr<Path> path = builder->Finish();
ctx->Clip(path);
}
gfxMatrix initialTM = ctx->CurrentMatrixDouble();
if (resize)
initialTM.PreScale(scale, scale);
// translate so that points are relative to the surface area
gfxPoint surfaceOffset =
nsLayoutUtils::PointToGfxPoint(-aArea.TopLeft(), pc->AppUnitsPerDevPixel());
initialTM.PreTranslate(surfaceOffset);
// temporarily hide the selection so that text is drawn normally. If a
// selection is being rendered, use that, otherwise use the presshell's
// selection.
RefPtr<nsFrameSelection> frameSelection;
if (aSelection) {
frameSelection = aSelection->GetFrameSelection();
}
else {
frameSelection = FrameSelection();
}
int16_t oldDisplaySelection = frameSelection->GetDisplaySelection();
frameSelection->SetDisplaySelection(nsISelectionController::SELECTION_HIDDEN);
// next, paint each range in the selection
for (const UniquePtr<RangePaintInfo>& rangeInfo : aItems) {
// the display lists paint relative to the offset from the reference
// frame, so account for that translation too:
gfxPoint rootOffset =
nsLayoutUtils::PointToGfxPoint(rangeInfo->mRootOffset,
pc->AppUnitsPerDevPixel());
ctx->SetMatrixDouble(initialTM.PreTranslate(rootOffset));
aArea.MoveBy(-rangeInfo->mRootOffset.x, -rangeInfo->mRootOffset.y);
nsRegion visible(aArea);
RefPtr<LayerManager> layerManager =
rangeInfo->mList.PaintRoot(&rangeInfo->mBuilder, ctx,
nsDisplayList::PAINT_DEFAULT);
aArea.MoveBy(rangeInfo->mRootOffset.x, rangeInfo->mRootOffset.y);
}
// restore the old selection display state
frameSelection->SetDisplaySelection(oldDisplaySelection);
return dt->Snapshot();
}
already_AddRefed<SourceSurface>
PresShell::RenderNode(nsINode* aNode,
const Maybe<CSSIntRegion>& aRegion,
const LayoutDeviceIntPoint aPoint,
LayoutDeviceIntRect* aScreenRect,
uint32_t aFlags)
{
// area will hold the size of the surface needed to draw the node, measured
// from the root frame.
nsRect area;
nsTArray<UniquePtr<RangePaintInfo>> rangeItems;
// nothing to draw if the node isn't in a document
if (!aNode->IsInComposedDoc()) {
return nullptr;
}
RefPtr<nsRange> range = new nsRange(aNode);
IgnoredErrorResult rv;
range->SelectNode(*aNode, rv);
if (rv.Failed()) {
return nullptr;
}
UniquePtr<RangePaintInfo> info = CreateRangePaintInfo(range, area, false);
if (info && !rangeItems.AppendElement(std::move(info))) {
return nullptr;
}
Maybe<CSSIntRegion> region = aRegion;
if (region) {
// combine the area with the supplied region
CSSIntRect rrectPixels = region->GetBounds();
nsRect rrect = ToAppUnits(rrectPixels, AppUnitsPerCSSPixel());
area.IntersectRect(area, rrect);
nsPresContext* pc = GetPresContext();
if (!pc)
return nullptr;
// move the region so that it is offset from the topleft corner of the surface
region->MoveBy(-nsPresContext::AppUnitsToIntCSSPixels(area.x),
-nsPresContext::AppUnitsToIntCSSPixels(area.y));
}
return PaintRangePaintInfo(rangeItems, nullptr, region, area, aPoint,
aScreenRect, aFlags);
}
already_AddRefed<SourceSurface>
PresShell::RenderSelection(Selection* aSelection,
const LayoutDeviceIntPoint aPoint,
LayoutDeviceIntRect* aScreenRect,
uint32_t aFlags)
{
// area will hold the size of the surface needed to draw the selection,
// measured from the root frame.
nsRect area;
nsTArray<UniquePtr<RangePaintInfo>> rangeItems;
// iterate over each range and collect them into the rangeItems array.
// This is done so that the size of selection can be determined so as
// to allocate a surface area
uint32_t numRanges = aSelection->RangeCount();
NS_ASSERTION(numRanges > 0, "RenderSelection called with no selection");
for (uint32_t r = 0; r < numRanges; r++)
{
RefPtr<nsRange> range = aSelection->GetRangeAt(r);
UniquePtr<RangePaintInfo> info = CreateRangePaintInfo(range, area, true);
if (info && !rangeItems.AppendElement(std::move(info))) {
return nullptr;
}
}
return PaintRangePaintInfo(rangeItems, aSelection, Nothing(), area, aPoint,
aScreenRect, aFlags);
}
void
PresShell::AddPrintPreviewBackgroundItem(nsDisplayListBuilder& aBuilder,
nsDisplayList& aList,
nsIFrame* aFrame,
const nsRect& aBounds)
{
aList.AppendToBottom(
MakeDisplayItem<nsDisplaySolidColor>(&aBuilder, aFrame, aBounds, NS_RGB(115, 115, 115)));
}
static bool
AddCanvasBackgroundColor(const nsDisplayList& aList, nsIFrame* aCanvasFrame,
nscolor aColor, bool aCSSBackgroundColor)
{
for (nsDisplayItem* i = aList.GetBottom(); i; i = i->GetAbove()) {
const DisplayItemType type = i->GetType();
if (i->Frame() == aCanvasFrame &&
type == DisplayItemType::TYPE_CANVAS_BACKGROUND_COLOR) {
nsDisplayCanvasBackgroundColor* bg = static_cast<nsDisplayCanvasBackgroundColor*>(i);
bg->SetExtraBackgroundColor(aColor);
return true;
}
const bool isBlendContainer =
type == DisplayItemType::TYPE_BLEND_CONTAINER ||
type == DisplayItemType::TYPE_TABLE_BLEND_CONTAINER;
nsDisplayList* sublist = i->GetSameCoordinateSystemChildren();
if (sublist && !(isBlendContainer && !aCSSBackgroundColor) &&
AddCanvasBackgroundColor(*sublist, aCanvasFrame, aColor, aCSSBackgroundColor))
return true;
}
return false;
}
void
PresShell::AddCanvasBackgroundColorItem(nsDisplayListBuilder& aBuilder,
nsDisplayList& aList,
nsIFrame* aFrame,
const nsRect& aBounds,
nscolor aBackstopColor,
uint32_t aFlags)
{
if (aBounds.IsEmpty()) {
return;
}
// We don't want to add an item for the canvas background color if the frame
// (sub)tree we are painting doesn't include any canvas frames. There isn't
// an easy way to check this directly, but if we check if the root of the
// (sub)tree we are painting is a canvas frame that should cover us in all
// cases (it will usually be a viewport frame when we have a canvas frame in
// the (sub)tree).
if (!(aFlags & nsIPresShell::FORCE_DRAW) &&
!nsCSSRendering::IsCanvasFrame(aFrame)) {
return;
}
nscolor bgcolor = NS_ComposeColors(aBackstopColor, mCanvasBackgroundColor);
if (NS_GET_A(bgcolor) == 0)
return;
// To make layers work better, we want to avoid having a big non-scrolled
// color background behind a scrolled transparent background. Instead,
// we'll try to move the color background into the scrolled content
// by making nsDisplayCanvasBackground paint it.
// If we're only adding an unscrolled item, then pretend that we've
// already done it.
bool addedScrollingBackgroundColor = (aFlags & APPEND_UNSCROLLED_ONLY);
if (!aFrame->GetParent() && !addedScrollingBackgroundColor) {
nsIScrollableFrame* sf =
aFrame->PresShell()->GetRootScrollFrameAsScrollable();
if (sf) {
nsCanvasFrame* canvasFrame = do_QueryFrame(sf->GetScrolledFrame());
if (canvasFrame && canvasFrame->IsVisibleForPainting(&aBuilder)) {
addedScrollingBackgroundColor =
AddCanvasBackgroundColor(aList, canvasFrame, bgcolor, mHasCSSBackgroundColor);
}
}
}
// With async scrolling, we'd like to have two instances of the background
// color: one that scrolls with the content (for the reasons stated above),
// and one underneath which does not scroll with the content, but which can
// be shown during checkerboarding and overscroll.
// We can only do that if the color is opaque.
bool forceUnscrolledItem = nsLayoutUtils::UsesAsyncScrolling(aFrame) &&
NS_GET_A(bgcolor) == 255;
if ((aFlags & ADD_FOR_SUBDOC) && gfxPrefs::LayoutUseContainersForRootFrames()) {
// If we're using ContainerLayers for a subdoc, then any items we add here will
// still be scrolled (since we're inside the container at this point), so don't
// bother and we will do it manually later.
forceUnscrolledItem = false;
}
if (!addedScrollingBackgroundColor || forceUnscrolledItem) {
aList.AppendToBottom(
MakeDisplayItem<nsDisplaySolidColor>(&aBuilder, aFrame, aBounds, bgcolor));
}
}
static bool IsTransparentContainerElement(nsPresContext* aPresContext)
{
nsCOMPtr<nsIDocShell> docShell = aPresContext->GetDocShell();
if (!docShell) {
return false;
}
nsCOMPtr<nsPIDOMWindowOuter> pwin = docShell->GetWindow();
if (!pwin)
return false;
nsCOMPtr<Element> containerElement = pwin->GetFrameElementInternal();
TabChild* tab = TabChild::GetFrom(docShell);
if (tab) {
// Check if presShell is the top PresShell. Only the top can
// influence the canvas background color.
nsCOMPtr<nsIPresShell> presShell = aPresContext->GetPresShell();
nsCOMPtr<nsIPresShell> topPresShell = tab->GetPresShell();
if (presShell != topPresShell) {
tab = nullptr;
}
}
return (containerElement &&
containerElement->HasAttr(kNameSpaceID_None, nsGkAtoms::transparent))
|| (tab && tab->IsTransparent());
}
nscolor PresShell::GetDefaultBackgroundColorToDraw()
{
if (!mPresContext || !mPresContext->GetBackgroundColorDraw()) {
return NS_RGB(255,255,255);
}
return mPresContext->DefaultBackgroundColor();
}
void PresShell::UpdateCanvasBackground()
{
// If we have a frame tree and it has style information that
// specifies the background color of the canvas, update our local
// cache of that color.
nsIFrame* rootStyleFrame = FrameConstructor()->GetRootElementStyleFrame();
if (rootStyleFrame) {
ComputedStyle* bgStyle =
nsCSSRendering::FindRootFrameBackground(rootStyleFrame);
// XXX We should really be passing the canvasframe, not the root element
// style frame but we don't have access to the canvasframe here. It isn't
// a problem because only a few frames can return something other than true
// and none of them would be a canvas frame or root element style frame.
bool drawBackgroundImage;
bool drawBackgroundColor;
mCanvasBackgroundColor =
nsCSSRendering::DetermineBackgroundColor(mPresContext, bgStyle,
rootStyleFrame,
drawBackgroundImage,
drawBackgroundColor);
mHasCSSBackgroundColor = drawBackgroundColor;
if (mPresContext->IsRootContentDocument() &&
!IsTransparentContainerElement(mPresContext)) {
mCanvasBackgroundColor =
NS_ComposeColors(GetDefaultBackgroundColorToDraw(), mCanvasBackgroundColor);
}
}
// If the root element of the document (ie html) has style 'display: none'
// then the document's background color does not get drawn; cache the
// color we actually draw.
if (!FrameConstructor()->GetRootElementFrame()) {
mCanvasBackgroundColor = GetDefaultBackgroundColorToDraw();
}
}
nscolor PresShell::ComputeBackstopColor(nsView* aDisplayRoot)
{
nsIWidget* widget = aDisplayRoot->GetWidget();
if (widget && (widget->GetTransparencyMode() != eTransparencyOpaque ||
widget->WidgetPaintsBackground())) {
// Within a transparent widget, so the backstop color must be
// totally transparent.
return NS_RGBA(0,0,0,0);
}
// Within an opaque widget (or no widget at all), so the backstop
// color must be totally opaque. The user's default background
// as reported by the prescontext is guaranteed to be opaque.
return GetDefaultBackgroundColorToDraw();
}
struct PaintParams {
nscolor mBackgroundColor;
};
LayerManager* PresShell::GetLayerManager()
{
NS_ASSERTION(mViewManager, "Should have view manager");
nsView* rootView = mViewManager->GetRootView();
if (rootView) {
if (nsIWidget* widget = rootView->GetWidget()) {
return widget->GetLayerManager();
}
}
return nullptr;
}
bool PresShell::AsyncPanZoomEnabled()
{
NS_ASSERTION(mViewManager, "Should have view manager");
nsView* rootView = mViewManager->GetRootView();
if (rootView) {
if (nsIWidget* widget = rootView->GetWidget()) {
return widget->AsyncPanZoomEnabled();
}
}
return gfxPlatform::AsyncPanZoomEnabled();
}
void PresShell::SetIgnoreViewportScrolling(bool aIgnore)
{
if (IgnoringViewportScrolling() == aIgnore) {
return;
}
RenderingState state(this);
state.mRenderFlags = ChangeFlag(state.mRenderFlags, aIgnore,
STATE_IGNORING_VIEWPORT_SCROLLING);
SetRenderingState(state);
}
nsresult PresShell::SetResolutionImpl(float aResolution, bool aScaleToResolution)
{
if (!(aResolution > 0.0)) {
return NS_ERROR_ILLEGAL_VALUE;
}
if (aResolution == mResolution.valueOr(0.0)) {
MOZ_ASSERT(mResolution.isSome());
return NS_OK;
}
RenderingState state(this);
state.mResolution = Some(aResolution);
SetRenderingState(state);
mScaleToResolution = aScaleToResolution;
if (mMobileViewportManager) {
mMobileViewportManager->ResolutionUpdated();
}
return NS_OK;
}
bool PresShell::ScaleToResolution() const
{
return mScaleToResolution;
}
float PresShell::GetCumulativeResolution()
{
float resolution = GetResolution();
nsPresContext* parentCtx = GetPresContext()->GetParentPresContext();
if (parentCtx) {
resolution *= parentCtx->PresShell()->GetCumulativeResolution();
}
return resolution;
}
float PresShell::GetCumulativeNonRootScaleResolution()
{
float resolution = 1.0;
nsIPresShell* currentShell = this;
while (currentShell) {
nsPresContext* currentCtx = currentShell->GetPresContext();
if (currentCtx != currentCtx->GetRootPresContext()) {
resolution *= currentShell->ScaleToResolution() ? currentShell->GetResolution() : 1.0f;
}
nsPresContext* parentCtx = currentCtx->GetParentPresContext();
if (parentCtx) {
currentShell = parentCtx->PresShell();
} else {
currentShell = nullptr;
}
}
return resolution;
}
void PresShell::SetRestoreResolution(float aResolution,
LayoutDeviceIntSize aDisplaySize)
{
if (mMobileViewportManager) {
mMobileViewportManager->SetRestoreResolution(aResolution, aDisplaySize);
}
}
void PresShell::SetRenderingState(const RenderingState& aState)
{
if (mRenderFlags != aState.mRenderFlags) {
// Rendering state changed in a way that forces us to flush any
// retained layers we might already have.
LayerManager* manager = GetLayerManager();
if (manager) {
FrameLayerBuilder::InvalidateAllLayers(manager);
}
}
mRenderFlags = aState.mRenderFlags;
mResolution = aState.mResolution;
}
void PresShell::SynthesizeMouseMove(bool aFromScroll)
{
if (!sSynthMouseMove)
return;
if (mPaintingSuppressed || !mIsActive || !mPresContext) {
return;
}
if (!mPresContext->IsRoot()) {
nsIPresShell* rootPresShell = GetRootPresShell();
if (rootPresShell) {
rootPresShell->SynthesizeMouseMove(aFromScroll);
}
return;
}
if (mMouseLocation == nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE))
return;
if (!mSynthMouseMoveEvent.IsPending()) {
RefPtr<nsSynthMouseMoveEvent> ev =
new nsSynthMouseMoveEvent(this, aFromScroll);
if (!GetPresContext()->RefreshDriver()
->AddRefreshObserver(ev, FlushType::Display)) {
NS_WARNING("failed to dispatch nsSynthMouseMoveEvent");
return;
}
mSynthMouseMoveEvent = std::move(ev);
}
}
/**
* Find the first floating view with a widget in a postorder traversal of the
* view tree that contains the point. Thus more deeply nested floating views
* are preferred over their ancestors, and floating views earlier in the
* view hierarchy (i.e., added later) are preferred over their siblings.
* This is adequate for finding the "topmost" floating view under a point,
* given that floating views don't supporting having a specific z-index.
*
* We cannot exit early when aPt is outside the view bounds, because floating
* views aren't necessarily included in their parent's bounds, so this could
* traverse the entire view hierarchy --- use carefully.
*/
static nsView* FindFloatingViewContaining(nsView* aView, nsPoint aPt)
{
if (aView->GetVisibility() == nsViewVisibility_kHide)
// No need to look into descendants.
return nullptr;
nsIFrame* frame = aView->GetFrame();
if (frame) {
if (!frame->IsVisibleConsideringAncestors(nsIFrame::VISIBILITY_CROSS_CHROME_CONTENT_BOUNDARY) ||
!frame->PresShell()->IsActive()) {
return nullptr;
}
}
for (nsView* v = aView->GetFirstChild(); v; v = v->GetNextSibling()) {
nsView* r = FindFloatingViewContaining(v, v->ConvertFromParentCoords(aPt));
if (r)
return r;
}
if (aView->GetFloating() && aView->HasWidget() &&
aView->GetDimensions().Contains(aPt))
return aView;
return nullptr;
}
/*
* This finds the first view containing the given point in a postorder
* traversal of the view tree that contains the point, assuming that the
* point is not in a floating view. It assumes that only floating views
* extend outside the bounds of their parents.
*
* This methods should only be called if FindFloatingViewContaining
* returns null.
*/
static nsView* FindViewContaining(nsView* aView, nsPoint aPt)
{
if (!aView->GetDimensions().Contains(aPt) ||
aView->GetVisibility() == nsViewVisibility_kHide) {
return nullptr;
}
nsIFrame* frame = aView->GetFrame();
if (frame) {
if (!frame->IsVisibleConsideringAncestors(nsIFrame::VISIBILITY_CROSS_CHROME_CONTENT_BOUNDARY) ||
!frame->PresShell()->IsActive()) {
return nullptr;
}
}
for (nsView* v = aView->GetFirstChild(); v; v = v->GetNextSibling()) {
nsView* r = FindViewContaining(v, v->ConvertFromParentCoords(aPt));
if (r)
return r;
}
return aView;
}
void
PresShell::ProcessSynthMouseMoveEvent(bool aFromScroll)
{
// If drag session has started, we shouldn't synthesize mousemove event.
nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
if (dragSession) {
mSynthMouseMoveEvent.Forget();
return;
}
// allow new event to be posted while handling this one only if the
// source of the event is a scroll (to prevent infinite reflow loops)
if (aFromScroll) {
mSynthMouseMoveEvent.Forget();
}
nsView* rootView = mViewManager ? mViewManager->GetRootView() : nullptr;
if (mMouseLocation == nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE) ||
!rootView || !rootView->HasWidget() || !mPresContext) {
mSynthMouseMoveEvent.Forget();
return;
}
NS_ASSERTION(mPresContext->IsRoot(), "Only a root pres shell should be here");
// Hold a ref to ourselves so DispatchEvent won't destroy us (since
// we need to access members after we call DispatchEvent).
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
#ifdef DEBUG_MOUSE_LOCATION
printf("[ps=%p]synthesizing mouse move to (%d,%d)\n",
this, mMouseLocation.x, mMouseLocation.y);
#endif
int32_t APD = mPresContext->AppUnitsPerDevPixel();
// We need a widget to put in the event we are going to dispatch so we look
// for a view that has a widget and the mouse location is over. We first look
// for floating views, if there isn't one we use the root view. |view| holds
// that view.
nsView* view = nullptr;
// The appunits per devpixel ratio of |view|.
int32_t viewAPD;
// mRefPoint will be mMouseLocation relative to the widget of |view|, the
// widget we will put in the event we dispatch, in viewAPD appunits
nsPoint refpoint(0, 0);
// We always dispatch the event to the pres shell that contains the view that
// the mouse is over. pointVM is the VM of that pres shell.
nsViewManager *pointVM = nullptr;
// This could be a bit slow (traverses entire view hierarchy)
// but it's OK to do it once per synthetic mouse event
view = FindFloatingViewContaining(rootView, mMouseLocation);
if (!view) {
view = rootView;
nsView *pointView = FindViewContaining(rootView, mMouseLocation);
// pointView can be null in situations related to mouse capture
pointVM = (pointView ? pointView : view)->GetViewManager();
refpoint = mMouseLocation + rootView->ViewToWidgetOffset();
viewAPD = APD;
} else {
pointVM = view->GetViewManager();
nsIFrame* frame = view->GetFrame();
NS_ASSERTION(frame, "floating views can't be anonymous");
viewAPD = frame->PresContext()->AppUnitsPerDevPixel();
refpoint = mMouseLocation.ScaleToOtherAppUnits(APD, viewAPD);
refpoint -= view->GetOffsetTo(rootView);
refpoint += view->ViewToWidgetOffset();
}
NS_ASSERTION(view->GetWidget(), "view should have a widget here");
WidgetMouseEvent event(true, eMouseMove, view->GetWidget(),
WidgetMouseEvent::eSynthesized);
event.mRefPoint =
LayoutDeviceIntPoint::FromAppUnitsToNearest(refpoint, viewAPD);
event.mTime = PR_IntervalNow();
// XXX set event.mModifiers ?
// XXX mnakano I think that we should get the latest information from widget.
nsCOMPtr<nsIPresShell> shell = pointVM->GetPresShell();
if (shell) {
// Since this gets run in a refresh tick there isn't an InputAPZContext on
// the stack from the nsBaseWidget. We need to simulate one with at least
// the correct target guid, so that the correct callback transform gets
// applied if this event goes to a child process. The input block id is set
// to 0 because this is a synthetic event which doesn't really belong to any
// input block. Same for the APZ response field.
InputAPZContext apzContext(mMouseEventTargetGuid, 0, nsEventStatus_eIgnore);
shell->DispatchSynthMouseMove(&event);
}
if (!aFromScroll) {
mSynthMouseMoveEvent.Forget();
}
}
/* static */ void
PresShell::MarkFramesInListApproximatelyVisible(const nsDisplayList& aList)
{
for (nsDisplayItem* item = aList.GetBottom(); item; item = item->GetAbove()) {
nsDisplayList* sublist = item->GetChildren();
if (sublist) {
MarkFramesInListApproximatelyVisible(*sublist);
continue;
}
nsIFrame* frame = item->Frame();
MOZ_ASSERT(frame);
if (!frame->TrackingVisibility()) {
continue;
}
// Use the presshell containing the frame.
auto* presShell = static_cast<PresShell*>(frame->PresShell());
MOZ_ASSERT(!presShell->AssumeAllFramesVisible());
if (presShell->mApproximatelyVisibleFrames.EnsureInserted(frame)) {
// The frame was added to mApproximatelyVisibleFrames, so increment its visible count.
frame->IncApproximateVisibleCount();
}
}
}
/* static */ void
PresShell::DecApproximateVisibleCount(VisibleFrames& aFrames,
const Maybe<OnNonvisible>& aNonvisibleAction
/* = Nothing() */)
{
for (auto iter = aFrames.Iter(); !iter.Done(); iter.Next()) {
nsIFrame* frame = iter.Get()->GetKey();
// Decrement the frame's visible count if we're still tracking its
// visibility. (We may not be, if the frame disabled visibility tracking
// after we added it to the visible frames list.)
if (frame->TrackingVisibility()) {
frame->DecApproximateVisibleCount(aNonvisibleAction);
}
}
}
void
PresShell::RebuildApproximateFrameVisibilityDisplayList(const nsDisplayList& aList)
{
MOZ_ASSERT(!mApproximateFrameVisibilityVisited, "already visited?");
mApproximateFrameVisibilityVisited = true;
// Remove the entries of the mApproximatelyVisibleFrames hashtable and put
// them in oldApproxVisibleFrames.
VisibleFrames oldApproximatelyVisibleFrames;
mApproximatelyVisibleFrames.SwapElements(oldApproximatelyVisibleFrames);
MarkFramesInListApproximatelyVisible(aList);
DecApproximateVisibleCount(oldApproximatelyVisibleFrames);
}
/* static */ void
PresShell::ClearApproximateFrameVisibilityVisited(nsView* aView, bool aClear)
{
nsViewManager* vm = aView->GetViewManager();
if (aClear) {
PresShell* presShell = static_cast<PresShell*>(vm->GetPresShell());
if (!presShell->mApproximateFrameVisibilityVisited) {
presShell->ClearApproximatelyVisibleFramesList();
}
presShell->mApproximateFrameVisibilityVisited = false;
}
for (nsView* v = aView->GetFirstChild(); v; v = v->GetNextSibling()) {
ClearApproximateFrameVisibilityVisited(v, v->GetViewManager() != vm);
}
}
void
PresShell::ClearApproximatelyVisibleFramesList(const Maybe<OnNonvisible>& aNonvisibleAction
/* = Nothing() */)
{
DecApproximateVisibleCount(mApproximatelyVisibleFrames, aNonvisibleAction);
mApproximatelyVisibleFrames.Clear();
}
void
PresShell::MarkFramesInSubtreeApproximatelyVisible(nsIFrame* aFrame,
const nsRect& aRect,
bool aRemoveOnly /* = false */)
{
MOZ_ASSERT(aFrame->PresShell() == this, "wrong presshell");
if (aFrame->TrackingVisibility() &&
aFrame->StyleVisibility()->IsVisible() &&
(!aRemoveOnly || aFrame->GetVisibility() == Visibility::APPROXIMATELY_VISIBLE)) {
MOZ_ASSERT(!AssumeAllFramesVisible());
if (mApproximatelyVisibleFrames.EnsureInserted(aFrame)) {
// The frame was added to mApproximatelyVisibleFrames, so increment its visible count.
aFrame->IncApproximateVisibleCount();
}
}
nsSubDocumentFrame* subdocFrame = do_QueryFrame(aFrame);
if (subdocFrame) {
nsIPresShell* presShell = subdocFrame->GetSubdocumentPresShellForPainting(
nsSubDocumentFrame::IGNORE_PAINT_SUPPRESSION);
if (presShell && !presShell->AssumeAllFramesVisible()) {
nsRect rect = aRect;
nsIFrame* root = presShell->GetRootFrame();
if (root) {
rect.MoveBy(aFrame->GetOffsetToCrossDoc(root));
} else {
rect.MoveBy(-aFrame->GetContentRectRelativeToSelf().TopLeft());
}
rect = rect.ScaleToOtherAppUnitsRoundOut(
aFrame->PresContext()->AppUnitsPerDevPixel(),
presShell->GetPresContext()->AppUnitsPerDevPixel());
presShell->RebuildApproximateFrameVisibility(&rect);
}
return;
}
nsRect rect = aRect;
nsIScrollableFrame* scrollFrame = do_QueryFrame(aFrame);
if (scrollFrame) {
bool ignoreDisplayPort = false;
if (nsLayoutUtils::IsMissingDisplayPortBaseRect(aFrame->GetContent())) {
// We can properly set the base rect for root scroll frames on top level
// and root content documents. Otherwise the base rect we compute might
// be way too big without the limiting that
// ScrollFrameHelper::DecideScrollableLayer does, so we just ignore the
// displayport in that case.
nsPresContext* pc = aFrame->PresContext();
if (scrollFrame->IsRootScrollFrameOfDocument() &&
(pc->IsRootContentDocument() || !pc->GetParentPresContext())) {
nsRect baseRect =
nsRect(nsPoint(0, 0), nsLayoutUtils::CalculateCompositionSizeForFrame(aFrame));
nsLayoutUtils::SetDisplayPortBase(aFrame->GetContent(), baseRect);
} else {
ignoreDisplayPort = true;
}
}
nsRect displayPort;
bool usingDisplayport = !ignoreDisplayPort &&
nsLayoutUtils::GetDisplayPortForVisibilityTesting(
aFrame->GetContent(), &displayPort, RelativeTo::ScrollFrame);
scrollFrame->NotifyApproximateFrameVisibilityUpdate(!usingDisplayport);
if (usingDisplayport) {
rect = displayPort;
} else {
rect = rect.Intersect(scrollFrame->GetScrollPortRect());
}
rect = scrollFrame->ExpandRectToNearlyVisible(rect);
}
bool preserves3DChildren = aFrame->Extend3DContext();
// We assume all frames in popups are visible, so we skip them here.
const nsIFrame::ChildListIDs skip(nsIFrame::kPopupList |
nsIFrame::kSelectPopupList);
for (nsIFrame::ChildListIterator childLists(aFrame);
!childLists.IsDone(); childLists.Next()) {
if (skip.Contains(childLists.CurrentID())) {
continue;
}
for (nsIFrame* child : childLists.CurrentList()) {
nsRect r = rect - child->GetPosition();
if (!r.IntersectRect(r, child->GetVisualOverflowRect())) {
continue;
}
if (child->IsTransformed()) {
// for children of a preserve3d element we just pass down the same dirty rect
if (!preserves3DChildren || !child->Combines3DTransformWithAncestors()) {
const nsRect overflow = child->GetVisualOverflowRectRelativeToSelf();
nsRect out;
if (nsDisplayTransform::UntransformRect(r, overflow, child, &out)) {
r = out;
} else {
r.SetEmpty();
}
}
}
MarkFramesInSubtreeApproximatelyVisible(child, r);
}
}
}
void
PresShell::RebuildApproximateFrameVisibility(nsRect* aRect,
bool aRemoveOnly /* = false */)
{
MOZ_ASSERT(!mApproximateFrameVisibilityVisited, "already visited?");
mApproximateFrameVisibilityVisited = true;
nsIFrame* rootFrame = GetRootFrame();
if (!rootFrame) {
return;
}
// Remove the entries of the mApproximatelyVisibleFrames hashtable and put
// them in oldApproximatelyVisibleFrames.
VisibleFrames oldApproximatelyVisibleFrames;
mApproximatelyVisibleFrames.SwapElements(oldApproximatelyVisibleFrames);
nsRect vis(nsPoint(0, 0), rootFrame->GetSize());
if (aRect) {
vis = *aRect;
}
MarkFramesInSubtreeApproximatelyVisible(rootFrame, vis, aRemoveOnly);
DecApproximateVisibleCount(oldApproximatelyVisibleFrames);
}
void
PresShell::UpdateApproximateFrameVisibility()
{
DoUpdateApproximateFrameVisibility(/* aRemoveOnly = */ false);
}
void
PresShell::DoUpdateApproximateFrameVisibility(bool aRemoveOnly)
{
MOZ_ASSERT(!mPresContext || mPresContext->IsRootContentDocument(),
"Updating approximate frame visibility on a non-root content document?");
mUpdateApproximateFrameVisibilityEvent.Revoke();
if (mHaveShutDown || mIsDestroying) {
return;
}
// call update on that frame
nsIFrame* rootFrame = GetRootFrame();
if (!rootFrame) {
ClearApproximatelyVisibleFramesList(Some(OnNonvisible::DISCARD_IMAGES));
return;
}
RebuildApproximateFrameVisibility(/* aRect = */ nullptr, aRemoveOnly);
ClearApproximateFrameVisibilityVisited(rootFrame->GetView(), true);
#ifdef DEBUG_FRAME_VISIBILITY_DISPLAY_LIST
// This can be used to debug the frame walker by comparing beforeFrameList
// and mApproximatelyVisibleFrames in RebuildFrameVisibilityDisplayList to see if
// they produce the same results (mApproximatelyVisibleFrames holds the frames the
// display list thinks are visible, beforeFrameList holds the frames the
// frame walker thinks are visible).
nsDisplayListBuilder builder(rootFrame, nsDisplayListBuilderMode::FRAME_VISIBILITY, false);
nsRect updateRect(nsPoint(0, 0), rootFrame->GetSize());
nsIFrame* rootScroll = GetRootScrollFrame();
if (rootScroll) {
nsIContent* content = rootScroll->GetContent();
if (content) {
Unused << nsLayoutUtils::GetDisplayPortForVisibilityTesting(content, &updateRect,
RelativeTo::ScrollFrame);
}
if (IgnoringViewportScrolling()) {
builder.SetIgnoreScrollFrame(rootScroll);
}
}
builder.IgnorePaintSuppression();
builder.EnterPresShell(rootFrame);
nsDisplayList list;
rootFrame->BuildDisplayListForStackingContext(&builder, updateRect, &list);
builder.LeavePresShell(rootFrame, &list);
RebuildApproximateFrameVisibilityDisplayList(list);
ClearApproximateFrameVisibilityVisited(rootFrame->GetView(), true);
list.DeleteAll(&builder);
#endif
}
bool
PresShell::AssumeAllFramesVisible()
{
static bool sFrameVisibilityEnabled = true;
static bool sFrameVisibilityPrefCached = false;
if (!sFrameVisibilityPrefCached) {
Preferences::AddBoolVarCache(&sFrameVisibilityEnabled,
"layout.framevisibility.enabled", true);
sFrameVisibilityPrefCached = true;
}
if (!sFrameVisibilityEnabled || !mPresContext || !mDocument) {
return true;
}
// We assume all frames are visible in print, print preview, chrome, and
// resource docs and don't keep track of them.
if (mPresContext->Type() == nsPresContext::eContext_PrintPreview ||
mPresContext->Type() == nsPresContext::eContext_Print ||
mPresContext->IsChrome() ||
mDocument->IsResourceDoc()) {
return true;
}
// If we're assuming all frames are visible in the top level content
// document, we need to in subdocuments as well. Otherwise we can get in a
// situation where things like animations won't work in subdocuments because
// their frames appear not to be visible, since we won't schedule an image
// visibility update if the top level content document is assuming all
// frames are visible.
//
// Note that it's not safe to call IsRootContentDocument() if we're
// currently being destroyed, so we have to check that first.
if (!mHaveShutDown && !mIsDestroying &&
!mPresContext->IsRootContentDocument()) {
nsPresContext* presContext =
mPresContext->GetToplevelContentDocumentPresContext();
if (presContext && presContext->PresShell()->AssumeAllFramesVisible()) {
return true;
}
}
return false;
}
void
PresShell::ScheduleApproximateFrameVisibilityUpdateSoon()
{
if (AssumeAllFramesVisible()) {
return;
}
if (!mPresContext) {
return;
}
nsRefreshDriver* refreshDriver = mPresContext->RefreshDriver();
if (!refreshDriver) {
return;
}
// Ask the refresh driver to update frame visibility soon.
refreshDriver->ScheduleFrameVisibilityUpdate();
}
void
PresShell::ScheduleApproximateFrameVisibilityUpdateNow()
{
if (AssumeAllFramesVisible()) {
return;
}
if (!mPresContext->IsRootContentDocument()) {
nsPresContext* presContext = mPresContext->GetToplevelContentDocumentPresContext();
if (!presContext)
return;
MOZ_ASSERT(presContext->IsRootContentDocument(),
"Didn't get a root prescontext from GetToplevelContentDocumentPresContext?");
presContext->PresShell()->ScheduleApproximateFrameVisibilityUpdateNow();
return;
}
if (mHaveShutDown || mIsDestroying) {
return;
}
if (mUpdateApproximateFrameVisibilityEvent.IsPending()) {
return;
}
RefPtr<nsRunnableMethod<PresShell>> event =
NewRunnableMethod("PresShell::UpdateApproximateFrameVisibility",
this,
&PresShell::UpdateApproximateFrameVisibility);
nsresult rv =
mDocument->Dispatch(TaskCategory::Other, do_AddRef(event));
if (NS_SUCCEEDED(rv)) {
mUpdateApproximateFrameVisibilityEvent = std::move(event);
}
}
void
PresShell::EnsureFrameInApproximatelyVisibleList(nsIFrame* aFrame)
{
if (!aFrame->TrackingVisibility()) {
return;
}
if (AssumeAllFramesVisible()) {
aFrame->IncApproximateVisibleCount();
return;
}
#ifdef DEBUG
// Make sure it's in this pres shell.
nsCOMPtr<nsIContent> content = aFrame->GetContent();
if (content) {
PresShell* shell = static_cast<PresShell*>(content->OwnerDoc()->GetShell());
MOZ_ASSERT(!shell || shell == this, "wrong shell");
}
#endif
if (mApproximatelyVisibleFrames.EnsureInserted(aFrame)) {
// We inserted a new entry.
aFrame->IncApproximateVisibleCount();
}
}
void
PresShell::RemoveFrameFromApproximatelyVisibleList(nsIFrame* aFrame)
{
#ifdef DEBUG
// Make sure it's in this pres shell.
nsCOMPtr<nsIContent> content = aFrame->GetContent();
if (content) {
PresShell* shell = static_cast<PresShell*>(content->OwnerDoc()->GetShell());
MOZ_ASSERT(!shell || shell == this, "wrong shell");
}
#endif
if (AssumeAllFramesVisible()) {
MOZ_ASSERT(mApproximatelyVisibleFrames.Count() == 0,
"Shouldn't have any frames in the table");
return;
}
if (mApproximatelyVisibleFrames.EnsureRemoved(aFrame) &&
aFrame->TrackingVisibility()) {
// aFrame was in the hashtable, and we're still tracking its visibility,
// so we need to decrement its visible count.
aFrame->DecApproximateVisibleCount();
}
}
class nsAutoNotifyDidPaint
{
public:
nsAutoNotifyDidPaint(PresShell* aShell, uint32_t aFlags)
: mShell(aShell), mFlags(aFlags)
{
}
~nsAutoNotifyDidPaint()
{
if (mFlags & nsIPresShell::PAINT_COMPOSITE) {
mShell->GetPresContext()->NotifyDidPaintForSubtree();
}
}
private:
PresShell* mShell;
uint32_t mFlags;
};
void
nsIPresShell::RecordShadowStyleChange(ShadowRoot& aShadowRoot)
{
mStyleSet->RecordShadowStyleChange(aShadowRoot);
ApplicableStylesChanged();
}
void
PresShell::Paint(nsView* aViewToPaint,
const nsRegion& aDirtyRegion,
uint32_t aFlags)
{
#ifdef MOZ_GECKO_PROFILER
nsIURI* uri = mDocument->GetDocumentURI();
nsIDocument* contentRoot = GetPrimaryContentDocument();
if (contentRoot) {
uri = contentRoot->GetDocumentURI();
}
AUTO_PROFILER_LABEL_DYNAMIC_NSCSTRING(
"PresShell::Paint", GRAPHICS,
uri ? uri->GetSpecOrDefault() : NS_LITERAL_CSTRING("N/A"));
#endif
Maybe<js::AutoAssertNoContentJS> nojs;
// On Android, Flash can call into content JS during painting, so we can't
// assert there. However, we don't rely on this assertion on Android because
// we don't paint while JS is running.
#if !defined(MOZ_WIDGET_ANDROID)
if (!(aFlags & nsIPresShell::PAINT_COMPOSITE)) {
// We need to allow content JS when the flag is set since we may trigger
// MozAfterPaint events in content in those cases.
nojs.emplace(dom::danger::GetJSContext());
}
#endif
NS_ASSERTION(!mIsDestroying, "painting a destroyed PresShell");
NS_ASSERTION(aViewToPaint, "null view");
MOZ_ASSERT(!mApproximateFrameVisibilityVisited, "Should have been cleared");
if (!mIsActive) {
return;
}
if (gfxPrefs::APZKeyboardEnabled()) {
// Update the focus target for async keyboard scrolling. This will be forwarded
// to APZ by nsDisplayList::PaintRoot. We need to to do this before we enter
// the paint phase because dispatching eVoid events can cause layout to happen.
mAPZFocusTarget = FocusTarget(this, mAPZFocusSequenceNumber);
}
nsPresContext* presContext = GetPresContext();
AUTO_LAYOUT_PHASE_ENTRY_POINT(presContext, Paint);
nsIFrame* frame = aViewToPaint->GetFrame();
LayerManager* layerManager =
aViewToPaint->GetWidget()->GetLayerManager();
NS_ASSERTION(layerManager, "Must be in paint event");
bool shouldInvalidate = layerManager->NeedsWidgetInvalidation();
nsAutoNotifyDidPaint notifyDidPaint(this, aFlags);
// Whether or not we should set first paint when painting is suppressed
// is debatable. For now we'll do it because B2G relied on first paint
// to configure the viewport and we only want to do that when we have
// real content to paint. See Bug 798245
if (mIsFirstPaint && !mPaintingSuppressed) {
layerManager->SetIsFirstPaint();
mIsFirstPaint = false;
}
if (!layerManager->BeginTransaction()) {
return;
}
// Send an updated focus target with this transaction. Be sure to do this
// before we paint in the case this is an empty transaction.
layerManager->SetFocusTarget(mAPZFocusTarget);
if (frame) {
// Try to do an empty transaction, if the frame tree does not
// need to be updated. Do not try to do an empty transaction on
// a non-retained layer manager (like the BasicLayerManager that
// draws the window title bar on Mac), because a) it won't work
// and b) below we don't want to clear NS_FRAME_UPDATE_LAYER_TREE,
// that will cause us to forget to update the real layer manager!
if (!(aFlags & PAINT_LAYERS)) {
if (layerManager->EndEmptyTransaction()) {
return;
}
NS_WARNING("Must complete empty transaction when compositing!");
}
if (!(aFlags & PAINT_SYNC_DECODE_IMAGES) &&
!(frame->GetStateBits() & NS_FRAME_UPDATE_LAYER_TREE) &&
!mNextPaintCompressed) {
NotifySubDocInvalidationFunc computeInvalidFunc =
presContext->MayHavePaintEventListenerInSubDocument() ? nsPresContext::NotifySubDocInvalidation : 0;
bool computeInvalidRect = computeInvalidFunc ||
(layerManager->GetBackendType() == LayersBackend::LAYERS_BASIC);
UniquePtr<LayerProperties> props;
// For WR, the layermanager has no root layer. We want to avoid
// calling ComputeDifferences in that case because it assumes non-null
// and crashes.
if (computeInvalidRect && layerManager->GetRoot()) {
props = LayerProperties::CloneFrom(layerManager->GetRoot());
}
MaybeSetupTransactionIdAllocator(layerManager, presContext);
if (layerManager->EndEmptyTransaction((aFlags & PAINT_COMPOSITE) ?
LayerManager::END_DEFAULT : LayerManager::END_NO_COMPOSITE)) {
nsIntRegion invalid;
bool areaOverflowed = false;
if (props) {
if (!props->ComputeDifferences(layerManager->GetRoot(), invalid, computeInvalidFunc)) {
areaOverflowed = true;
}
} else {
LayerProperties::ClearInvalidations(layerManager->GetRoot());
}
if (props && !areaOverflowed) {
if (!invalid.IsEmpty()) {
nsIntRect bounds = invalid.GetBounds();
nsRect rect(presContext->DevPixelsToAppUnits(bounds.x),
presContext->DevPixelsToAppUnits(bounds.y),
presContext->DevPixelsToAppUnits(bounds.width),
presContext->DevPixelsToAppUnits(bounds.height));
if (shouldInvalidate) {
aViewToPaint->GetViewManager()->InvalidateViewNoSuppression(aViewToPaint, rect);
}
presContext->NotifyInvalidation(layerManager->GetLastTransactionId(), bounds);
}
} else if (shouldInvalidate) {
aViewToPaint->GetViewManager()->InvalidateView(aViewToPaint);
}
frame->UpdatePaintCountForPaintedPresShells();
return;
}
}
frame->RemoveStateBits(NS_FRAME_UPDATE_LAYER_TREE);
}
if (frame) {
frame->ClearPresShellsFromLastPaint();
}
nscolor bgcolor = ComputeBackstopColor(aViewToPaint);
PaintFrameFlags flags = PaintFrameFlags::PAINT_WIDGET_LAYERS |
PaintFrameFlags::PAINT_EXISTING_TRANSACTION;
if (!(aFlags & PAINT_COMPOSITE)) {
flags |= PaintFrameFlags::PAINT_NO_COMPOSITE;
}
if (aFlags & PAINT_SYNC_DECODE_IMAGES) {
flags |= PaintFrameFlags::PAINT_SYNC_DECODE_IMAGES;
}
if (mNextPaintCompressed) {
flags |= PaintFrameFlags::PAINT_COMPRESSED;
mNextPaintCompressed = false;
}
if (frame) {
// We can paint directly into the widget using its layer manager.
nsLayoutUtils::PaintFrame(nullptr, frame, aDirtyRegion, bgcolor,
nsDisplayListBuilderMode::PAINTING, flags);
return;
}
if (layerManager->GetBackendType() == layers::LayersBackend::LAYERS_WR) {
nsPresContext* pc = GetPresContext();
LayoutDeviceRect bounds =
LayoutDeviceRect::FromAppUnits(pc->GetVisibleArea(), pc->AppUnitsPerDevPixel());
bgcolor = NS_ComposeColors(bgcolor, mCanvasBackgroundColor);
WebRenderBackgroundData data(wr::ToLayoutRect(bounds), wr::ToColorF(ToDeviceColor(bgcolor)));
nsTArray<wr::WrFilterOp> wrFilters;
MaybeSetupTransactionIdAllocator(layerManager, presContext);
layerManager->AsWebRenderLayerManager()->EndTransactionWithoutLayer(nullptr, nullptr, wrFilters, &data);
return;
}
RefPtr<ColorLayer> root = layerManager->CreateColorLayer();
if (root) {
nsPresContext* pc = GetPresContext();
nsIntRect bounds =
pc->GetVisibleArea().ToOutsidePixels(pc->AppUnitsPerDevPixel());
bgcolor = NS_ComposeColors(bgcolor, mCanvasBackgroundColor);
root->SetColor(Color::FromABGR(bgcolor));
root->SetVisibleRegion(LayerIntRegion::FromUnknownRegion(bounds));
layerManager->SetRoot(root);
}
MaybeSetupTransactionIdAllocator(layerManager, presContext);
layerManager->EndTransaction(nullptr, nullptr, (aFlags & PAINT_COMPOSITE) ?
LayerManager::END_DEFAULT : LayerManager::END_NO_COMPOSITE);
}
// static
void
nsIPresShell::SetCapturingContent(nsIContent* aContent, uint8_t aFlags)
{
// If capture was set for pointer lock, don't unlock unless we are coming
// out of pointer lock explicitly.
if (!aContent && gCaptureInfo.mPointerLock &&
!(aFlags & CAPTURE_POINTERLOCK)) {
return;
}
gCaptureInfo.mContent = nullptr;
// only set capturing content if allowed or the CAPTURE_IGNOREALLOWED or
// CAPTURE_POINTERLOCK flags are used.
if ((aFlags & CAPTURE_IGNOREALLOWED) || gCaptureInfo.mAllowed ||
(aFlags & CAPTURE_POINTERLOCK)) {
if (aContent) {
gCaptureInfo.mContent = aContent;
}
// CAPTURE_POINTERLOCK is the same as CAPTURE_RETARGETTOELEMENT & CAPTURE_IGNOREALLOWED
gCaptureInfo.mRetargetToElement = ((aFlags & CAPTURE_RETARGETTOELEMENT) != 0) ||
((aFlags & CAPTURE_POINTERLOCK) != 0);
gCaptureInfo.mPreventDrag = (aFlags & CAPTURE_PREVENTDRAG) != 0;
gCaptureInfo.mPointerLock = (aFlags & CAPTURE_POINTERLOCK) != 0;
}
}
nsIContent*
PresShell::GetCurrentEventContent()
{
if (mCurrentEventContent &&
mCurrentEventContent->GetComposedDoc() != mDocument) {
mCurrentEventContent = nullptr;
mCurrentEventFrame = nullptr;
}
return mCurrentEventContent;
}
nsIFrame*
PresShell::GetCurrentEventFrame()
{
if (MOZ_UNLIKELY(mIsDestroying)) {
return nullptr;
}
// GetCurrentEventContent() makes sure the content is still in the
// same document that this pres shell belongs to. If not, then the
// frame shouldn't get an event, nor should we even assume its safe
// to try and find the frame.
nsIContent* content = GetCurrentEventContent();
if (!mCurrentEventFrame && content) {
mCurrentEventFrame = content->GetPrimaryFrame();
MOZ_ASSERT(!mCurrentEventFrame ||
mCurrentEventFrame->PresContext()->GetPresShell() == this);
}
return mCurrentEventFrame;
}
already_AddRefed<nsIContent>
PresShell::GetEventTargetContent(WidgetEvent* aEvent)
{
nsCOMPtr<nsIContent> content = GetCurrentEventContent();
if (!content) {
nsIFrame* currentEventFrame = GetCurrentEventFrame();
if (currentEventFrame) {
currentEventFrame->GetContentForEvent(aEvent, getter_AddRefs(content));
NS_ASSERTION(!content || content->GetComposedDoc() == mDocument,
"handing out content from a different doc");
}
}
return content.forget();
}
void
PresShell::PushCurrentEventInfo(nsIFrame* aFrame, nsIContent* aContent)
{
if (mCurrentEventFrame || mCurrentEventContent) {
mCurrentEventFrameStack.InsertElementAt(0, mCurrentEventFrame);
mCurrentEventContentStack.InsertObjectAt(mCurrentEventContent, 0);
}
mCurrentEventFrame = aFrame;
mCurrentEventContent = aContent;
}
void
PresShell::PopCurrentEventInfo()
{
mCurrentEventFrame = nullptr;
mCurrentEventContent = nullptr;
if (0 != mCurrentEventFrameStack.Length()) {
mCurrentEventFrame = mCurrentEventFrameStack.ElementAt(0);
mCurrentEventFrameStack.RemoveElementAt(0);
mCurrentEventContent = mCurrentEventContentStack.ObjectAt(0);
mCurrentEventContentStack.RemoveObjectAt(0);
// Don't use it if it has moved to a different document.
if (mCurrentEventContent &&
mCurrentEventContent->GetComposedDoc() != mDocument) {
mCurrentEventContent = nullptr;
mCurrentEventFrame = nullptr;
}
}
}
bool PresShell::InZombieDocument(nsIContent *aContent)
{
// If a content node points to a null document, or the document is not
// attached to a window, then it is possibly in a zombie document,
// about to be replaced by a newly loading document.
// Such documents cannot handle DOM events.
// It might actually be in a node not attached to any document,
// in which case there is not parent presshell to retarget it to.
nsIDocument* doc = aContent->GetComposedDoc();
return !doc || !doc->GetWindow();
}
already_AddRefed<nsPIDOMWindowOuter>
PresShell::GetRootWindow()
{
nsCOMPtr<nsPIDOMWindowOuter> window = mDocument->GetWindow();
if (window) {
nsCOMPtr<nsPIDOMWindowOuter> rootWindow = window->GetPrivateRoot();
NS_ASSERTION(rootWindow, "nsPIDOMWindow::GetPrivateRoot() returns NULL");
return rootWindow.forget();
}
// If we don't have DOM window, we're zombie, we should find the root window
// with our parent shell.
nsCOMPtr<nsIPresShell> parent = GetParentPresShellForEventHandling();
NS_ENSURE_TRUE(parent, nullptr);
return parent->GetRootWindow();
}
already_AddRefed<nsPIDOMWindowOuter>
PresShell::GetFocusedDOMWindowInOurWindow()
{
nsCOMPtr<nsPIDOMWindowOuter> rootWindow = GetRootWindow();
NS_ENSURE_TRUE(rootWindow, nullptr);
nsCOMPtr<nsPIDOMWindowOuter> focusedWindow;
nsFocusManager::GetFocusedDescendant(rootWindow,
nsFocusManager::eIncludeAllDescendants,
getter_AddRefs(focusedWindow));
return focusedWindow.forget();
}
already_AddRefed<nsIContent>
nsIPresShell::GetFocusedContentInOurWindow() const
{
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm && mDocument) {
RefPtr<Element> focusedElement;
fm->GetFocusedElementForWindow(mDocument->GetWindow(), false, nullptr,
getter_AddRefs(focusedElement));
return focusedElement.forget();
}
return nullptr;
}
already_AddRefed<nsIPresShell>
PresShell::GetParentPresShellForEventHandling()
{
NS_ENSURE_TRUE(mPresContext, nullptr);
// Now, find the parent pres shell and send the event there
nsCOMPtr<nsIDocShellTreeItem> treeItem = mPresContext->GetDocShell();
if (!treeItem) {
treeItem = mForwardingContainer.get();
}
// Might have gone away, or never been around to start with
NS_ENSURE_TRUE(treeItem, nullptr);
nsCOMPtr<nsIDocShellTreeItem> parentTreeItem;
treeItem->GetParent(getter_AddRefs(parentTreeItem));
nsCOMPtr<nsIDocShell> parentDocShell = do_QueryInterface(parentTreeItem);
NS_ENSURE_TRUE(parentDocShell && treeItem != parentTreeItem, nullptr);
nsCOMPtr<nsIPresShell> parentPresShell = parentDocShell->GetPresShell();
return parentPresShell.forget();
}
nsresult
PresShell::RetargetEventToParent(WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus)
{
// Send this events straight up to the parent pres shell.
// We do this for keystroke events in zombie documents or if either a frame
// or a root content is not present.
// That way at least the UI key bindings can work.
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
nsCOMPtr<nsIPresShell> parentPresShell = GetParentPresShellForEventHandling();
NS_ENSURE_TRUE(parentPresShell, NS_ERROR_FAILURE);
// Fake the event as though it's from the parent pres shell's root frame.
return parentPresShell->HandleEvent(parentPresShell->GetRootFrame(), aEvent, true, aEventStatus);
}
void
PresShell::DisableNonTestMouseEvents(bool aDisable)
{
sDisableNonTestMouseEvents = aDisable;
}
void
PresShell::RecordMouseLocation(WidgetGUIEvent* aEvent)
{
if (!mPresContext)
return;
if (!mPresContext->IsRoot()) {
PresShell* rootPresShell = GetRootPresShell();
if (rootPresShell) {
rootPresShell->RecordMouseLocation(aEvent);
}
return;
}
if ((aEvent->mMessage == eMouseMove &&
aEvent->AsMouseEvent()->mReason == WidgetMouseEvent::eReal) ||
aEvent->mMessage == eMouseEnterIntoWidget ||
aEvent->mMessage == eMouseDown ||
aEvent->mMessage == eMouseUp) {
nsIFrame* rootFrame = GetRootFrame();
if (!rootFrame) {
nsView* rootView = mViewManager->GetRootView();
mMouseLocation = nsLayoutUtils::TranslateWidgetToView(mPresContext,
aEvent->mWidget, aEvent->mRefPoint, rootView);
mMouseEventTargetGuid = InputAPZContext::GetTargetLayerGuid();
} else {
mMouseLocation =
nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent, rootFrame);
mMouseEventTargetGuid = InputAPZContext::GetTargetLayerGuid();
}
#ifdef DEBUG_MOUSE_LOCATION
if (aEvent->mMessage == eMouseEnterIntoWidget) {
printf("[ps=%p]got mouse enter for %p\n",
this, aEvent->mWidget);
}
printf("[ps=%p]setting mouse location to (%d,%d)\n",
this, mMouseLocation.x, mMouseLocation.y);
#endif
if (aEvent->mMessage == eMouseEnterIntoWidget) {
SynthesizeMouseMove(false);
}
} else if (aEvent->mMessage == eMouseExitFromWidget) {
// Although we only care about the mouse moving into an area for which this
// pres shell doesn't receive mouse move events, we don't check which widget
// the mouse exit was for since this seems to vary by platform. Hopefully
// this won't matter at all since we'll get the mouse move or enter after
// the mouse exit when the mouse moves from one of our widgets into another.
mMouseLocation = nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
mMouseEventTargetGuid = InputAPZContext::GetTargetLayerGuid();
#ifdef DEBUG_MOUSE_LOCATION
printf("[ps=%p]got mouse exit for %p\n",
this, aEvent->mWidget);
printf("[ps=%p]clearing mouse location\n",
this);
#endif
}
}
static nsIFrame*
GetNearestFrameContainingPresShell(nsIPresShell* aPresShell)
{
nsView* view = aPresShell->GetViewManager()->GetRootView();
while (view && !view->GetFrame()) {
view = view->GetParent();
}
nsIFrame* frame = nullptr;
if (view) {
frame = view->GetFrame();
}
return frame;
}
static bool
FlushThrottledStyles(nsIDocument* aDocument, void *aData)
{
nsIPresShell* shell = aDocument->GetShell();
if (shell && shell->IsVisible()) {
nsPresContext* presContext = shell->GetPresContext();
if (presContext) {
presContext->RestyleManager()->UpdateOnlyAnimationStyles();
}
}
aDocument->EnumerateSubDocuments(FlushThrottledStyles, nullptr);
return true;
}
bool
PresShell::CanDispatchEvent(const WidgetGUIEvent* aEvent) const
{
bool rv =
mPresContext && !mHaveShutDown && nsContentUtils::IsSafeToRunScript();
if (aEvent) {
rv &= (aEvent && aEvent->mWidget && !aEvent->mWidget->Destroyed());
}
return rv;
}
/* static */ PresShell*
PresShell::GetShellForEventTarget(nsIFrame* aFrame, nsIContent* aContent)
{
if (aFrame) {
return static_cast<PresShell*>(aFrame->PresShell());
}
if (aContent) {
nsIDocument* doc = aContent->GetComposedDoc();
if (!doc) {
return nullptr;
}
return static_cast<PresShell*>(doc->GetShell());
}
return nullptr;
}
/* static */ PresShell*
PresShell::GetShellForTouchEvent(WidgetGUIEvent* aEvent)
{
PresShell* shell = nullptr;
switch (aEvent->mMessage) {
case eTouchMove:
case eTouchCancel:
case eTouchEnd: {
// get the correct shell to dispatch to
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
for (dom::Touch* touch : touchEvent->mTouches) {
if (!touch) {
break;
}
RefPtr<dom::Touch> oldTouch =
TouchManager::GetCapturedTouch(touch->Identifier());
if (!oldTouch) {
break;
}
nsCOMPtr<nsIContent> content = do_QueryInterface(oldTouch->GetTarget());
if (!content) {
break;
}
nsIFrame* contentFrame = content->GetPrimaryFrame();
if (!contentFrame) {
break;
}
shell = static_cast<PresShell*>(contentFrame->PresContext()->PresShell());
if (shell) {
break;
}
}
break;
}
default:
break;
}
return shell;
}
nsresult
PresShell::HandleEvent(nsIFrame* aFrame,
WidgetGUIEvent* aEvent,
bool aDontRetargetEvents,
nsEventStatus* aEventStatus)
{
#ifdef MOZ_TASK_TRACER
Maybe<AutoSourceEvent> taskTracerEvent;
if (MOZ_UNLIKELY(IsStartLogging())) {
// Make touch events, mouse events and hardware key events to be
// the source events of TaskTracer, and originate the rest
// correlation tasks from here.
SourceEventType type = SourceEventType::Unknown;
if (aEvent->AsTouchEvent()) {
type = SourceEventType::Touch;
} else if (aEvent->AsMouseEvent()) {
type = SourceEventType::Mouse;
} else if (aEvent->AsKeyboardEvent()) {
type = SourceEventType::Key;
}
taskTracerEvent.emplace(type);
}
#endif
NS_ASSERTION(aFrame, "aFrame should be not null");
// Update the latest focus sequence number with this new sequence number;
// the next transasction that gets sent to the compositor will carry this over
if (mAPZFocusSequenceNumber < aEvent->mFocusSequenceNumber) {
mAPZFocusSequenceNumber = aEvent->mFocusSequenceNumber;
}
if (mIsDestroying ||
(sDisableNonTestMouseEvents && !aEvent->mFlags.mIsSynthesizedForTests &&
aEvent->HasMouseEventMessage())) {
return NS_OK;
}
RecordMouseLocation(aEvent);
if (AccessibleCaretEnabled(mDocument->GetDocShell())) {
// We have to target the focus window because regardless of where the
// touch goes, we want to access the copy paste manager.
nsCOMPtr<nsPIDOMWindowOuter> window = GetFocusedDOMWindowInOurWindow();
nsCOMPtr<nsIDocument> retargetEventDoc =
window ? window->GetExtantDoc() : nullptr;
nsCOMPtr<nsIPresShell> presShell =
retargetEventDoc ? retargetEventDoc->GetShell() : nullptr;
RefPtr<AccessibleCaretEventHub> eventHub =
presShell ? presShell->GetAccessibleCaretEventHub() : nullptr;
if (eventHub && *aEventStatus != nsEventStatus_eConsumeNoDefault) {
// Don't dispatch event to AccessibleCaretEventHub when the event status
// is nsEventStatus_eConsumeNoDefault. This might be happened when content
// preventDefault on the pointer events. In such case, we also call
// preventDefault on mouse events to stop default behaviors.
*aEventStatus = eventHub->HandleEvent(aEvent);
if (*aEventStatus == nsEventStatus_eConsumeNoDefault) {
// If the event is consumed, cancel APZC panning by setting
// mMultipleActionsPrevented.
aEvent->mFlags.mMultipleActionsPrevented = true;
return NS_OK;
}
}
}
if (!nsContentUtils::IsSafeToRunScript() &&
aEvent->IsAllowedToDispatchDOMEvent()) {
if (aEvent->mClass == eCompositionEventClass) {
IMEStateManager::OnCompositionEventDiscarded(
aEvent->AsCompositionEvent());
}
#ifdef DEBUG
if (aEvent->IsIMERelatedEvent()) {
nsPrintfCString warning("%d event is discarded", aEvent->mMessage);
NS_WARNING(warning.get());
}
#endif
nsContentUtils::WarnScriptWasIgnored(GetDocument());
return NS_OK;
}
nsIContent* capturingContent = ((aEvent->mClass == ePointerEventClass ||
aEvent->mClass == eWheelEventClass ||
aEvent->HasMouseEventMessage())
? GetCapturingContent()
: nullptr);
nsCOMPtr<nsIDocument> retargetEventDoc;
if (!aDontRetargetEvents) {
// key and IME related events should not cross top level window boundary.
// Basically, such input events should be fired only on focused widget.
// However, some IMEs might need to clean up composition after focused
// window is deactivated. And also some tests on MozMill want to test key
// handling on deactivated window because MozMill window can be activated
// during tests. So, there is no merit the events should be redirected to
// active window. So, the events should be handled on the last focused
// content in the last focused DOM window in same top level window.
// Note, if no DOM window has been focused yet, we can discard the events.
if (aEvent->IsTargetedAtFocusedWindow()) {
nsCOMPtr<nsPIDOMWindowOuter> window = GetFocusedDOMWindowInOurWindow();
// No DOM window in same top level window has not been focused yet,
// discard the events.
if (!window) {
return NS_OK;
}
retargetEventDoc = window->GetExtantDoc();
if (!retargetEventDoc)
return NS_OK;
} else if (capturingContent) {
// if the mouse is being captured then retarget the mouse event at the
// document that is being captured.
retargetEventDoc = capturingContent->GetComposedDoc();
#ifdef ANDROID
} else if ((aEvent->mClass == eTouchEventClass) ||
(aEvent->mClass == eMouseEventClass) ||
(aEvent->mClass == eWheelEventClass)) {
retargetEventDoc = GetPrimaryContentDocument();
#endif
}
if (retargetEventDoc) {
nsCOMPtr<nsIPresShell> presShell = retargetEventDoc->GetShell();
// Even if the document doesn't have PresShell, i.e., it's invisible, we
// need to dispatch only KeyboardEvent in its nearest visible document
// because key focus shouldn't be caught by invisible document.
if (!presShell) {
if (!aEvent->HasKeyEventMessage()) {
return NS_OK;
}
while (!presShell) {
retargetEventDoc = retargetEventDoc->GetParentDocument();
if (!retargetEventDoc) {
return NS_OK;
}
presShell = retargetEventDoc->GetShell();
}
}
if (presShell != this) {
nsIFrame* frame = presShell->GetRootFrame();
if (!frame) {
if (aEvent->mMessage == eQueryTextContent ||
aEvent->IsContentCommandEvent()) {
return NS_OK;
}
frame = GetNearestFrameContainingPresShell(presShell);
}
if (!frame)
return NS_OK;
nsCOMPtr<nsIPresShell> shell = frame->PresContext()->GetPresShell();
return shell->HandleEvent(frame, aEvent, true, aEventStatus);
}
}
}
if (aEvent->mClass == eKeyboardEventClass &&
mDocument && mDocument->EventHandlingSuppressed()) {
if (aEvent->mMessage == eKeyDown) {
mNoDelayedKeyEvents = true;
} else if (!mNoDelayedKeyEvents) {
DelayedEvent* event = new DelayedKeyEvent(aEvent->AsKeyboardEvent());
if (!mDelayedEvents.AppendElement(event)) {
delete event;
}
}
aEvent->mFlags.mIsSuppressedOrDelayed = true;
return NS_OK;
}
nsIFrame* frame = aFrame;
if (aEvent->IsUsingCoordinates()) {
if (mDocument) {
if (aEvent->mClass == eTouchEventClass) {
nsIDocument::UnlockPointer();
}
AutoWeakFrame weakFrame(frame);
{ // scope for scriptBlocker.
nsAutoScriptBlocker scriptBlocker;
FlushThrottledStyles(GetRootPresShell()->GetDocument(), nullptr);
}
if (!weakFrame.IsAlive()) {
frame = GetNearestFrameContainingPresShell(this);
}
}
if (!frame) {
NS_WARNING("Nothing to handle this event!");
return NS_OK;
}
nsPresContext* framePresContext = frame->PresContext();
nsPresContext* rootPresContext = framePresContext->GetRootPresContext();
NS_ASSERTION(rootPresContext == mPresContext->GetRootPresContext(),
"How did we end up outside the connected prescontext/viewmanager hierarchy?");
nsIFrame* popupFrame =
nsLayoutUtils::GetPopupFrameForEventCoordinates(rootPresContext, aEvent);
// If a remote browser is currently capturing input break out if we
// detect a chrome generated popup.
if (popupFrame && capturingContent &&
EventStateManager::IsRemoteTarget(capturingContent)) {
capturingContent = nullptr;
}
// If the popupFrame is an ancestor of the 'frame', the frame should
// handle the event, otherwise, the popup should handle it.
if (popupFrame &&
!nsContentUtils::ContentIsCrossDocDescendantOf(
framePresContext->GetPresShell()->GetDocument(),
popupFrame->GetContent())) {
// If we aren't starting our event dispatch from the root frame of the
// root prescontext, then someone must be capturing the mouse. In that
// case we only want to use the popup list if the capture is
// inside the popup.
if (framePresContext == rootPresContext &&
frame == mFrameConstructor->GetRootFrame()) {
frame = popupFrame;
} else if (capturingContent &&
nsContentUtils::ContentIsDescendantOf(
capturingContent, popupFrame->GetContent())) {
frame = popupFrame;
}
}
bool captureRetarget = false;
if (capturingContent) {
// If a capture is active, determine if the docshell is visible. If not,
// clear the capture and target the mouse event normally instead. This
// would occur if the mouse button is held down while a tab change occurs.
// If the docshell is visible, look for a scrolling container.
bool vis;
nsCOMPtr<nsIBaseWindow> baseWin =
do_QueryInterface(mPresContext->GetContainerWeak());
if (baseWin && NS_SUCCEEDED(baseWin->GetVisibility(&vis)) && vis) {
captureRetarget = gCaptureInfo.mRetargetToElement;
if (!captureRetarget) {
// A check was already done above to ensure that capturingContent is
// in this presshell.
NS_ASSERTION(capturingContent->GetComposedDoc() == GetDocument(),
"Unexpected document");
nsIFrame* captureFrame = capturingContent->GetPrimaryFrame();
if (captureFrame) {
if (capturingContent->IsHTMLElement(nsGkAtoms::select)) {
// a dropdown <select> has a child in its selectPopupList and we should
// capture on that instead.
nsIFrame* childFrame = captureFrame->GetChildList(nsIFrame::kSelectPopupList).FirstChild();
if (childFrame) {
captureFrame = childFrame;
}
}
// scrollable frames should use the scrolling container as
// the root instead of the document
nsIScrollableFrame* scrollFrame = do_QueryFrame(captureFrame);
if (scrollFrame) {
frame = scrollFrame->GetScrolledFrame();
}
}
}
}
else {
ClearMouseCapture(nullptr);
capturingContent = nullptr;
}
}
// The order to generate pointer event is
// 1. check pending pointer capture.
// 2. check if there is a capturing content.
// 3. hit test
// 4. dispatch pointer events
// 5. check whether the targets of all Touch instances are in the same
// document and suppress invalid instances.
// 6. dispatch mouse or touch events.
// Try to keep frame for following check, because frame can be damaged
// during MaybeProcessPointerCapture.
{
AutoWeakFrame frameKeeper(frame);
PointerEventHandler::MaybeProcessPointerCapture(aEvent);
// Prevent application crashes, in case damaged frame.
if (!frameKeeper.IsAlive()) {
NS_WARNING("Nothing to handle this event!");
return NS_OK;
}
}
// Only capture mouse events and pointer events.
nsCOMPtr<nsIContent> pointerCapturingContent =
PointerEventHandler::GetPointerCapturingContent(aEvent);
if (pointerCapturingContent) {
frame = pointerCapturingContent->GetPrimaryFrame();
if (!frame) {
RefPtr<PresShell> shell =
GetShellForEventTarget(nullptr, pointerCapturingContent);
if (!shell) {
// If we can't process event for the capturing content, release
// the capture.
PointerEventHandler::ReleaseIfCaptureByDescendant(
pointerCapturingContent);
return NS_OK;
}
nsCOMPtr<nsIContent> overrideClickTarget =
GetOverrideClickTarget(aEvent, aFrame);
// Dispatch events to the capturing content even it's frame is
// destroyed.
PointerEventHandler::DispatchPointerFromMouseOrTouch(
shell, nullptr, pointerCapturingContent, aEvent, false,
aEventStatus, nullptr);
return shell->HandleEventWithTarget(aEvent, nullptr,
pointerCapturingContent,
aEventStatus, true, nullptr,
overrideClickTarget);
}
}
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
bool isWindowLevelMouseExit = (aEvent->mMessage == eMouseExitFromWidget) &&
(mouseEvent && mouseEvent->mExitFrom == WidgetMouseEvent::eTopLevel);
// Get the frame at the event point. However, don't do this if we're
// capturing and retargeting the event because the captured frame will
// be used instead below. Also keep using the root frame if we're dealing
// with a window-level mouse exit event since we want to start sending
// mouse out events at the root EventStateManager.
if (!captureRetarget && !isWindowLevelMouseExit &&
!pointerCapturingContent) {
if (aEvent->mClass == eTouchEventClass) {
frame = TouchManager::SetupTarget(aEvent->AsTouchEvent(), frame);
} else {
uint32_t flags = 0;
nsPoint eventPoint =
nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent, frame);
if (mouseEvent && mouseEvent->mClass == eMouseEventClass &&
mouseEvent->mIgnoreRootScrollFrame) {
flags |= INPUT_IGNORE_ROOT_SCROLL_FRAME;
}
nsIFrame* target =
FindFrameTargetedByInputEvent(aEvent, frame, eventPoint, flags);
if (target) {
frame = target;
}
}
}
// if a node is capturing the mouse, check if the event needs to be
// retargeted at the capturing content instead. This will be the case when
// capture retargeting is being used, no frame was found or the frame's
// content is not a descendant of the capturing content.
if (capturingContent && !pointerCapturingContent &&
(gCaptureInfo.mRetargetToElement || !frame->GetContent() ||
!nsContentUtils::ContentIsCrossDocDescendantOf(frame->GetContent(),
capturingContent))) {
// A check was already done above to ensure that capturingContent is
// in this presshell.
NS_ASSERTION(capturingContent->GetComposedDoc() == GetDocument(),
"Unexpected document");
nsIFrame* capturingFrame = capturingContent->GetPrimaryFrame();
if (capturingFrame) {
frame = capturingFrame;
}
}
// Suppress mouse event if it's being targeted at an element inside
// a document which needs events suppressed
if (aEvent->mClass == eMouseEventClass &&
frame->PresContext()->Document()->EventHandlingSuppressed()) {
if (aEvent->mMessage == eMouseDown) {
mNoDelayedMouseEvents = true;
} else if (!mNoDelayedMouseEvents && (aEvent->mMessage == eMouseUp ||
// contextmenu is triggered after right mouseup on Windows and right
// mousedown on other platforms.
aEvent->mMessage == eContextMenu)) {
DelayedEvent* event = new DelayedMouseEvent(aEvent->AsMouseEvent());
if (!mDelayedEvents.AppendElement(event)) {
delete event;
}
}
return NS_OK;
}
if (!frame) {
NS_WARNING("Nothing to handle this event!");
return NS_OK;
}
RefPtr<PresShell> shell = static_cast<PresShell*>(frame->PresShell());
// Check if we have an active EventStateManager which isn't the
// EventStateManager of the current PresContext.
// If that is the case, and mouse is over some ancestor document,
// forward event handling to the active document.
// This way content can get mouse events even when
// mouse is over the chrome or outside the window.
//
// Note, currently for backwards compatibility we don't forward mouse events
// to the active document when mouse is over some subdocument.
if (EventStateManager* activeESM = EventStateManager::GetActiveEventStateManager()) {
if (aEvent->mClass == ePointerEventClass || aEvent->HasMouseEventMessage()) {
if (activeESM != shell->GetPresContext()->EventStateManager()) {
if (nsPresContext* activeContext = activeESM->GetPresContext()) {
if (nsIPresShell* activeShell = activeContext->GetPresShell()) {
if (nsContentUtils::ContentIsCrossDocDescendantOf(activeShell->GetDocument(),
shell->GetDocument())) {
shell = static_cast<PresShell*>(activeShell);
frame = shell->GetRootFrame();
}
}
}
}
}
}
if (!frame) {
NS_WARNING("Nothing to handle this event!");
return NS_OK;
}
nsCOMPtr<nsIContent> targetElement;
frame->GetContentForEvent(aEvent, getter_AddRefs(targetElement));
// If there is no content for this frame, target it anyway. Some
// frames can be targeted but do not have content, particularly
// windows with scrolling off.
if (targetElement) {
// Bug 103055, bug 185889: mouse events apply to *elements*, not all
// nodes. Thus we get the nearest element parent here.
// XXX we leave the frame the same even if we find an element
// parent, so that the text frame will receive the event (selection
// and friends are the ones who care about that anyway)
//
// We use weak pointers because during this tight loop, the node
// will *not* go away. And this happens on every mousemove.
while (targetElement && !targetElement->IsElement()) {
targetElement = targetElement->GetFlattenedTreeParent();
}
// If we found an element, target it. Otherwise, target *nothing*.
if (!targetElement) {
return NS_OK;
}
}
nsCOMPtr<nsIContent> overrideClickTarget;
if (PointerEventHandler::IsPointerEventEnabled()) {
// Dispatch pointer events from the mouse or touch events. Regarding
// pointer events from mouse, we should dispatch those pointer events to
// the same target as the source mouse events. We pass the frame found
// in hit test to PointerEventHandler and dispatch pointer events to it.
//
// Regarding pointer events from touch, the behavior is different. Touch
// events are dispatched to the same target as the target of touchstart.
// Multiple touch points must be dispatched to the same document. Pointer
// events from touch can be dispatched to different documents. We Pass the
// original frame to PointerEventHandler, reentry PresShell::HandleEvent,
// and do hit test for each point.
nsIFrame* targetFrame =
aEvent->mClass == eTouchEventClass ? aFrame : frame;
if (pointerCapturingContent) {
overrideClickTarget = GetOverrideClickTarget(aEvent, aFrame);
shell = GetShellForEventTarget(nullptr, pointerCapturingContent);
if (!shell) {
// If we can't process event for the capturing content, release
// the capture.
PointerEventHandler::ReleaseIfCaptureByDescendant(
pointerCapturingContent);
return NS_OK;
}
targetFrame = pointerCapturingContent->GetPrimaryFrame();
frame = targetFrame;
}
AutoWeakFrame weakTargetFrame(targetFrame);
AutoWeakFrame weakFrame(frame);
nsCOMPtr<nsIContent> targetContent;
PointerEventHandler::DispatchPointerFromMouseOrTouch(
shell, targetFrame, targetElement, aEvent,
aDontRetargetEvents, aEventStatus,
getter_AddRefs(targetContent));
if (!weakTargetFrame.IsAlive() && aEvent->mClass == eMouseEventClass) {
// Spec only defines that mouse events must be dispatched to the same
// target as the pointer event. If the target is no longer participating
// in its ownerDocument's tree, fire the event at the original target's
// nearest ancestor node
if (!targetContent) {
return NS_OK;
}
frame = targetContent->GetPrimaryFrame();
shell = GetShellForEventTarget(frame, targetContent);
if (!shell) {
return NS_OK;
}
} else if (!weakFrame.IsAlive()) {
return NS_OK;
}
}
// frame could be null after dispatching pointer events.
if (aEvent->mClass == eTouchEventClass) {
if (aEvent->mMessage == eTouchStart) {
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
if (nsIFrame* newFrame =
TouchManager::SuppressInvalidPointsAndGetTargetedFrame(
touchEvent)) {
frame = newFrame;
frame->GetContentForEvent(aEvent, getter_AddRefs(targetElement));
shell = static_cast<PresShell*>(frame->PresShell());
}
} else if (PresShell* newShell = GetShellForTouchEvent(aEvent)) {
// Touch events (except touchstart) are dispatching to the captured
// element. Get correct shell from it.
shell = newShell;
}
}
nsresult rv;
// Handle the event in the correct shell.
// We pass the subshell's root frame as the frame to start from. This is
// the only correct alternative; if the event was captured then it
// must have been captured by us or some ancestor shell and we
// now ask the subshell to dispatch it normally.
shell->PushCurrentEventInfo(frame, targetElement);
rv = shell->HandleEventInternal(aEvent, aEventStatus, true,
overrideClickTarget);
#ifdef DEBUG
shell->ShowEventTargetDebug();
#endif
shell->PopCurrentEventInfo();
return rv;
}
nsresult rv = NS_OK;
if (frame) {
PushCurrentEventInfo(nullptr, nullptr);
// key and IME related events go to the focused frame in this DOM window.
if (aEvent->IsTargetedAtFocusedContent()) {
mCurrentEventContent = nullptr;
nsCOMPtr<nsPIDOMWindowOuter> window = mDocument->GetWindow();
nsCOMPtr<nsPIDOMWindowOuter> focusedWindow;
nsCOMPtr<nsIContent> eventTarget =
nsFocusManager::GetFocusedDescendant(window,
nsFocusManager::eOnlyCurrentWindow,
getter_AddRefs(focusedWindow));
// otherwise, if there is no focused content or the focused content has
// no frame, just use the root content. This ensures that key events
// still get sent to the window properly if nothing is focused or if a
// frame goes away while it is focused.
if (!eventTarget || !eventTarget->GetPrimaryFrame()) {
eventTarget = mDocument->GetUnfocusedKeyEventTarget();
}
if (aEvent->mMessage == eKeyDown) {
NS_IF_RELEASE(gKeyDownTarget);
NS_IF_ADDREF(gKeyDownTarget = eventTarget);
}
else if ((aEvent->mMessage == eKeyPress ||
aEvent->mMessage == eKeyUp) &&
gKeyDownTarget) {
// If a different element is now focused for the keypress/keyup event
// than what was focused during the keydown event, check if the new
// focused element is not in a chrome document any more, and if so,
// retarget the event back at the keydown target. This prevents a
// content area from grabbing the focus from chrome in-between key
// events.
if (eventTarget) {
bool keyDownIsChrome = nsContentUtils::IsChromeDoc(gKeyDownTarget->GetComposedDoc());
if (keyDownIsChrome != nsContentUtils::IsChromeDoc(eventTarget->GetComposedDoc()) ||
(keyDownIsChrome && TabParent::GetFrom(eventTarget))) {
eventTarget = gKeyDownTarget;
}
}
if (aEvent->mMessage == eKeyUp) {
NS_RELEASE(gKeyDownTarget);
}
}
mCurrentEventFrame = nullptr;
nsIDocument* targetDoc = eventTarget ? eventTarget->OwnerDoc() : nullptr;
if (targetDoc && targetDoc != mDocument) {
PopCurrentEventInfo();
nsCOMPtr<nsIPresShell> shell = targetDoc->GetShell();
if (shell) {
rv = static_cast<PresShell*>(shell.get())->
HandleRetargetedEvent(aEvent, aEventStatus, eventTarget);
}
return rv;
} else {
mCurrentEventContent = eventTarget;
}
if (!GetCurrentEventContent() || !GetCurrentEventFrame() ||
InZombieDocument(mCurrentEventContent)) {
rv = RetargetEventToParent(aEvent, aEventStatus);
PopCurrentEventInfo();
return rv;
}
} else {
mCurrentEventFrame = frame;
}
if (GetCurrentEventFrame()) {
rv = HandleEventInternal(aEvent, aEventStatus, true);
}
#ifdef DEBUG
ShowEventTargetDebug();
#endif
PopCurrentEventInfo();
} else {
// Activation events need to be dispatched even if no frame was found, since
// we don't want the focus to be out of sync.
if (!NS_EVENT_NEEDS_FRAME(aEvent)) {
mCurrentEventFrame = nullptr;
return HandleEventInternal(aEvent, aEventStatus, true);
}
else if (aEvent->HasKeyEventMessage()) {
// Keypress events in new blank tabs should not be completely thrown away.
// Retarget them -- the parent chrome shell might make use of them.
return RetargetEventToParent(aEvent, aEventStatus);
}
}
return rv;
}
nsIDocument*
PresShell::GetPrimaryContentDocument()
{
nsPresContext* context = GetPresContext();
if (!context || !context->IsRoot()) {
return nullptr;
}
nsCOMPtr<nsIDocShellTreeItem> shellAsTreeItem = context->GetDocShell();
if (!shellAsTreeItem) {
return nullptr;
}
nsCOMPtr<nsIDocShellTreeOwner> owner;
shellAsTreeItem->GetTreeOwner(getter_AddRefs(owner));
if (!owner) {
return nullptr;
}
// now get the primary content shell (active tab)
nsCOMPtr<nsIDocShellTreeItem> item;
owner->GetPrimaryContentShell(getter_AddRefs(item));
nsCOMPtr<nsIDocShell> childDocShell = do_QueryInterface(item);
if (!childDocShell) {
return nullptr;
}
return childDocShell->GetDocument();
}
#ifdef DEBUG
void
PresShell::ShowEventTargetDebug()
{
if (nsFrame::GetShowEventTargetFrameBorder() &&
GetCurrentEventFrame()) {
if (mDrawEventTargetFrame) {
mDrawEventTargetFrame->InvalidateFrame();
}
mDrawEventTargetFrame = mCurrentEventFrame;
mDrawEventTargetFrame->InvalidateFrame();
}
}
#endif
nsresult
PresShell::HandleEventWithTarget(WidgetEvent* aEvent, nsIFrame* aFrame,
nsIContent* aContent, nsEventStatus* aStatus,
bool aIsHandlingNativeEvent,
nsIContent** aTargetContent,
nsIContent* aOverrideClickTarget)
{
#if DEBUG
MOZ_ASSERT(!aFrame || aFrame->PresContext()->GetPresShell() == this,
"wrong shell");
if (aContent) {
nsIDocument* doc = aContent->GetComposedDoc();
NS_ASSERTION(doc, "event for content that isn't in a document");
// NOTE: We don't require that the document still have a PresShell.
// See bug 1375940.
}
#endif
NS_ENSURE_STATE(!aContent || aContent->GetComposedDoc() == mDocument);
AutoPointerEventTargetUpdater updater(this, aEvent, aFrame, aTargetContent);
PushCurrentEventInfo(aFrame, aContent);
nsresult rv =
HandleEventInternal(aEvent, aStatus, false, aOverrideClickTarget);
PopCurrentEventInfo();
return rv;
}
nsresult
PresShell::HandleEventInternal(WidgetEvent* aEvent,
nsEventStatus* aStatus,
bool aIsHandlingNativeEvent,
nsIContent* aOverrideClickTarget)
{
RefPtr<EventStateManager> manager = mPresContext->EventStateManager();
nsresult rv = NS_OK;
if (!NS_EVENT_NEEDS_FRAME(aEvent) || GetCurrentEventFrame() || GetCurrentEventContent()) {
bool touchIsNew = false;
bool isHandlingUserInput = false;
if (mCurrentEventContent && aEvent->IsTargetedAtFocusedWindow()) {
nsFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm) {
fm->FlushBeforeEventHandlingIfNeeded(mCurrentEventContent);
}
}
// XXX How about IME events and input events for plugins?
if (aEvent->IsTrusted()) {
if (aEvent->IsUserAction()) {
mHasHandledUserInput = true;
}
switch (aEvent->mMessage) {
case eKeyPress:
case eKeyDown:
case eKeyUp: {
nsIDocument* doc = GetCurrentEventContent() ?
mCurrentEventContent->OwnerDoc() : nullptr;
auto keyCode = aEvent->AsKeyboardEvent()->mKeyCode;
if (keyCode == NS_VK_ESCAPE) {
nsIDocument* root = nsContentUtils::GetRootDocument(doc);
if (root && root->GetFullscreenElement()) {
// Prevent default action on ESC key press when exiting
// DOM fullscreen mode. This prevents the browser ESC key
// handler from stopping all loads in the document, which
// would cause <video> loads to stop.
// XXX We need to claim the Escape key event which will be
// dispatched only into chrome is already consumed by
// content because we need to prevent its default here
// for some reasons (not sure) but we need to detect
// if a chrome event handler will call PreventDefault()
// again and check it later.
aEvent->PreventDefaultBeforeDispatch(CrossProcessForwarding::eStop);
aEvent->mFlags.mOnlyChromeDispatch = true;
// The event listeners in chrome can prevent this ESC behavior by
// calling prevent default on the preceding keydown/press events.
if (!mIsLastChromeOnlyEscapeKeyConsumed &&
aEvent->mMessage == eKeyUp) {
// ESC key released while in DOM fullscreen mode.
// Fully exit all browser windows and documents from
// fullscreen mode.
nsIDocument::AsyncExitFullscreen(nullptr);
}
}
nsCOMPtr<nsIDocument> pointerLockedDoc =
do_QueryReferent(EventStateManager::sPointerLockedDoc);
if (!mIsLastChromeOnlyEscapeKeyConsumed && pointerLockedDoc) {
// XXX See above comment to understand the reason why this needs
// to claim that the Escape key event is consumed by content
// even though it will be dispatched only into chrome.
aEvent->PreventDefaultBeforeDispatch(CrossProcessForwarding::eStop);
aEvent->mFlags.mOnlyChromeDispatch = true;
if (aEvent->mMessage == eKeyUp) {
nsIDocument::UnlockPointer();
}
}
}
if (keyCode != NS_VK_ESCAPE && keyCode != NS_VK_SHIFT &&
keyCode != NS_VK_CONTROL && keyCode != NS_VK_ALT &&
keyCode != NS_VK_WIN && keyCode != NS_VK_META) {
// Allow keys other than ESC and modifiers be marked as a
// valid user input for triggering popup, fullscreen, and
// pointer lock.
isHandlingUserInput = true;
mPresContext->RecordInteractionTime(
nsPresContext::InteractionType::eKeyInteraction,
aEvent->mTimeStamp);
}
Telemetry::AccumulateTimeDelta(Telemetry::INPUT_EVENT_QUEUED_KEYBOARD_MS, aEvent->mTimeStamp);
break;
}
case eMouseDown:
case eMouseUp:
Telemetry::AccumulateTimeDelta(Telemetry::INPUT_EVENT_QUEUED_CLICK_MS, aEvent->mTimeStamp);
MOZ_FALLTHROUGH;
case ePointerDown:
case ePointerUp:
isHandlingUserInput = true;
mPresContext->RecordInteractionTime(
nsPresContext::InteractionType::eClickInteraction,
aEvent->mTimeStamp);
break;
case eMouseMove:
if (aEvent->mFlags.mHandledByAPZ) {
Telemetry::AccumulateTimeDelta(Telemetry::INPUT_EVENT_QUEUED_APZ_MOUSE_MOVE_MS, aEvent->mTimeStamp);
}
break;
case eDrop: {
nsCOMPtr<nsIDragSession> session = nsContentUtils::GetDragSession();
if (session) {
bool onlyChromeDrop = false;
session->GetOnlyChromeDrop(&onlyChromeDrop);
if (onlyChromeDrop) {
aEvent->mFlags.mOnlyChromeDispatch = true;
}
}
break;
}
case eWheel:
if (aEvent->mFlags.mHandledByAPZ) {
Telemetry::AccumulateTimeDelta(Telemetry::INPUT_EVENT_QUEUED_APZ_WHEEL_MS, aEvent->mTimeStamp);
}
break;
case eTouchMove:
if (aEvent->mFlags.mHandledByAPZ) {
Telemetry::AccumulateTimeDelta(Telemetry::INPUT_EVENT_QUEUED_APZ_TOUCH_MOVE_MS, aEvent->mTimeStamp);
}
break;
default:
break;
}
if (!mTouchManager.PreHandleEvent(aEvent, aStatus,
touchIsNew, isHandlingUserInput,
mCurrentEventContent)) {
return NS_OK;
}
}
if (aEvent->mMessage == eContextMenu) {
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
if (mouseEvent->IsContextMenuKeyEvent() &&
!AdjustContextMenuKeyEvent(mouseEvent)) {
return NS_OK;
}
if (mouseEvent->IsShift()) {
aEvent->mFlags.mOnlyChromeDispatch = true;
aEvent->mFlags.mRetargetToNonNativeAnonymous = true;
}
}
AutoHandlingUserInputStatePusher userInpStatePusher(isHandlingUserInput,
aEvent, mDocument);
if (aEvent->IsTrusted() && aEvent->mMessage == eMouseMove) {
nsIPresShell::AllowMouseCapture(
EventStateManager::GetActiveEventStateManager() == manager);
mPresContext->RecordInteractionTime(
nsPresContext::InteractionType::eMouseMoveInteraction,
aEvent->mTimeStamp);
}
nsAutoPopupStatePusher popupStatePusher(
Event::GetEventPopupControlState(aEvent));
// FIXME. If the event was reused, we need to clear the old target,
// bug 329430
aEvent->mTarget = nullptr;
TimeStamp handlerStartTime = TimeStamp::Now();
// 1. Give event to event manager for pre event state changes and
// generation of synthetic events.
rv = manager->PreHandleEvent(mPresContext, aEvent, mCurrentEventFrame,
mCurrentEventContent, aStatus,
aOverrideClickTarget);
// 2. Give event to the DOM for third party and JS use.
if (NS_SUCCEEDED(rv)) {
bool wasHandlingKeyBoardEvent =
nsContentUtils::IsHandlingKeyBoardEvent();
if (aEvent->mClass == eKeyboardEventClass) {
nsContentUtils::SetIsHandlingKeyBoardEvent(true);
}
// If EventStateManager or something wants reply from remote process and
// needs to win any other event listeners in chrome, the event is both
// stopped its propagation and marked as "waiting reply from remote
// process". In this case, PresShell shouldn't dispatch the event into
// the DOM tree because they don't have a chance to stop propagation in
// the system event group. On the other hand, if its propagation is not
// stopped, that means that the event may be reserved by chrome. If it's
// reserved by chrome, the event shouldn't be sent to any remote
// processes. In this case, PresShell needs to dispatch the event to
// the DOM tree for checking if it's reserved.
if (aEvent->IsAllowedToDispatchDOMEvent() &&
!(aEvent->PropagationStopped() &&
aEvent->IsWaitingReplyFromRemoteProcess())) {
MOZ_ASSERT(nsContentUtils::IsSafeToRunScript(),
"Somebody changed aEvent to cause a DOM event!");
nsPresShellEventCB eventCB(this);
if (nsIFrame* target = GetCurrentEventFrame()) {
if (target->OnlySystemGroupDispatch(aEvent->mMessage)) {
aEvent->StopPropagation();
}
}
if (aEvent->mClass == eTouchEventClass) {
DispatchTouchEventToDOM(aEvent, aStatus, &eventCB, touchIsNew);
} else {
DispatchEventToDOM(aEvent, aStatus, &eventCB);
}
}
nsContentUtils::SetIsHandlingKeyBoardEvent(wasHandlingKeyBoardEvent);
if (aEvent->mMessage == ePointerUp ||
aEvent->mMessage == ePointerCancel) {
// Implicitly releasing capture for given pointer.
// ePointerLostCapture should be send after ePointerUp or
// ePointerCancel.
WidgetPointerEvent* pointerEvent = aEvent->AsPointerEvent();
MOZ_ASSERT(pointerEvent);
PointerEventHandler::ReleasePointerCaptureById(pointerEvent->pointerId);
PointerEventHandler::CheckPointerCaptureState(pointerEvent);
}
// 3. Give event to event manager for post event state changes and
// generation of synthetic events.
if (!mIsDestroying && NS_SUCCEEDED(rv)) {
rv = manager->PostHandleEvent(mPresContext, aEvent,
GetCurrentEventFrame(), aStatus,
aOverrideClickTarget);
}
}
if (!mIsDestroying && aIsHandlingNativeEvent) {
// Ensure that notifications to IME should be sent before getting next
// native event from the event queue.
// XXX Should we check the event message or event class instead of
// using aIsHandlingNativeEvent?
manager->TryToFlushPendingNotificationsToIME();
}
switch (aEvent->mMessage) {
case eKeyPress:
case eKeyDown:
case eKeyUp: {
if (aEvent->AsKeyboardEvent()->mKeyCode == NS_VK_ESCAPE) {
if (aEvent->mMessage == eKeyUp) {
// Reset this flag after key up is handled.
mIsLastChromeOnlyEscapeKeyConsumed = false;
} else {
if (aEvent->mFlags.mOnlyChromeDispatch &&
aEvent->mFlags.mDefaultPreventedByChrome) {
mIsLastChromeOnlyEscapeKeyConsumed = true;
}
}
}
if (aEvent->mMessage == eKeyDown) {
mIsLastKeyDownCanceled = aEvent->mFlags.mDefaultPrevented;
}
break;
}
case eMouseUp:
// reset the capturing content now that the mouse button is up
SetCapturingContent(nullptr, 0);
break;
case eMouseMove:
nsIPresShell::AllowMouseCapture(false);
break;
case eDrag:
case eDragEnd:
case eDragEnter:
case eDragExit:
case eDragLeave:
case eDragOver:
case eDrop: {
// After any drag event other than dragstart (which is handled separately,
// as we need to collect the data first), the DataTransfer needs to be
// made protected, and then disconnected.
DataTransfer* dataTransfer = aEvent->AsDragEvent()->mDataTransfer;
if (dataTransfer) {
dataTransfer->Disconnect();
}
break;
}
default:
break;
}
if (aEvent->IsTrusted() && aEvent->mTimeStamp > mLastOSWake) {
switch (aEvent->mMessage) {
case eKeyPress:
case eKeyDown:
case eKeyUp:
Telemetry::AccumulateTimeDelta(Telemetry::INPUT_EVENT_HANDLED_KEYBOARD_MS, handlerStartTime);
break;
case eMouseDown:
Telemetry::AccumulateTimeDelta(Telemetry::INPUT_EVENT_HANDLED_MOUSE_DOWN_MS, handlerStartTime);
break;
case eMouseUp:
Telemetry::AccumulateTimeDelta(Telemetry::INPUT_EVENT_HANDLED_MOUSE_UP_MS, handlerStartTime);
break;
case eMouseMove:
if (aEvent->mFlags.mHandledByAPZ) {
Telemetry::AccumulateTimeDelta(Telemetry::INPUT_EVENT_HANDLED_APZ_MOUSE_MOVE_MS, handlerStartTime);
}
break;
case eWheel:
if (aEvent->mFlags.mHandledByAPZ) {
Telemetry::AccumulateTimeDelta(Telemetry::INPUT_EVENT_HANDLED_APZ_WHEEL_MS, handlerStartTime);
}
break;
case eTouchMove:
if (aEvent->mFlags.mHandledByAPZ) {
Telemetry::AccumulateTimeDelta(Telemetry::INPUT_EVENT_HANDLED_APZ_TOUCH_MOVE_MS, handlerStartTime);
}
break;
default:
break;
}
}
}
if (Telemetry::CanRecordBase() &&
!aEvent->mTimeStamp.IsNull() &&
aEvent->mTimeStamp > mLastOSWake &&
aEvent->AsInputEvent()) {
TimeStamp now = TimeStamp::Now();
double millis = (now - aEvent->mTimeStamp).ToMilliseconds();
Telemetry::Accumulate(Telemetry::INPUT_EVENT_RESPONSE_MS, millis);
if (mDocument && mDocument->GetReadyStateEnum() != nsIDocument::READYSTATE_COMPLETE) {
Telemetry::Accumulate(Telemetry::LOAD_INPUT_EVENT_RESPONSE_MS, millis);
}
if (!sLastInputProcessed || sLastInputProcessed < aEvent->mTimeStamp) {
if (sLastInputProcessed) {
// This input event was created after we handled the last one.
// Accumulate the previous events' coalesced duration.
double lastMillis = (sLastInputProcessed - sLastInputCreated).ToMilliseconds();
Telemetry::Accumulate(Telemetry::INPUT_EVENT_RESPONSE_COALESCED_MS,
lastMillis);
if (MOZ_UNLIKELY(!sProcessInteractable)) {
// For content process, we use the ready state of
// top-level-content-document to know if the process has finished the
// start-up.
// For parent process, see the topic
// 'sessionstore-one-or-no-tab-restored' in PresShell::Observe.
if (XRE_IsContentProcess() &&
mDocument && mDocument->IsTopLevelContentDocument()) {
switch (mDocument->GetReadyStateEnum()) {
case nsIDocument::READYSTATE_INTERACTIVE:
case nsIDocument::READYSTATE_COMPLETE:
sProcessInteractable = true;
break;
default:
break;
}
}
}
if (MOZ_LIKELY(sProcessInteractable)) {
Telemetry::Accumulate(Telemetry::INPUT_EVENT_RESPONSE_POST_STARTUP_MS,
lastMillis);
} else {
Telemetry::Accumulate(Telemetry::INPUT_EVENT_RESPONSE_STARTUP_MS,
lastMillis);
}
}
sLastInputCreated = aEvent->mTimeStamp;
} else if (aEvent->mTimeStamp < sLastInputCreated) {
// This event was created before the last input. May be processing out
// of order, so coalesce backwards, too.
sLastInputCreated = aEvent->mTimeStamp;
}
sLastInputProcessed = now;
}
return rv;
}
#ifdef NIGHTLY_BUILD
static already_AddRefed<nsIURI>
GetDocumentURIToCompareWithBlacklist(PresShell& aPresShell)
{
nsPresContext* presContext = aPresShell.GetPresContext();
if (NS_WARN_IF(!presContext)) {
return nullptr;
}
// If the document is sandboxed document or data: document, we should
// get URI of the parent document.
for (nsIDocument* document = presContext->Document();
document && document->IsContentDocument();
document = document->GetParentDocument()) {
// The document URI may be about:blank even if it comes from actual web
// site. Therefore, we need to check the URI of its principal.
nsIPrincipal* principal = document->NodePrincipal();
if (principal->GetIsNullPrincipal()) {
continue;
}
nsCOMPtr<nsIURI> uri;
principal->GetURI(getter_AddRefs(uri));
return uri.forget();
}
return nullptr;
}
static bool
DispatchKeyPressEventsEvenForNonPrintableKeys(nsIURI* aURI)
{
if (!aURI) {
return false;
}
nsAutoCString scheme;
aURI->GetScheme(scheme);
if (!scheme.EqualsLiteral("http") &&
!scheme.EqualsLiteral("https")) {
return false;
}
nsAutoCString host;
aURI->GetHost(host);
if (host.IsEmpty()) {
return false;
}
// The black list is comma separated domain list. Each item may start with
// "*.". If starts with "*.", it matches any sub-domains.
static const char* kPrefNameOfBlackList =
"dom.keyboardevent.keypress.hack.dispatch_non_printable_keys";
nsAutoCString blackList;
Preferences::GetCString(kPrefNameOfBlackList, blackList);
if (blackList.IsEmpty()) {
return false;
}
for (;;) {
int32_t index = blackList.Find(host, false);
if (index >= 0 &&
static_cast<uint32_t>(index) + host.Length() <= blackList.Length() &&
// If start of the black list or next to ","?
(!index || blackList[index - 1] == ',')) {
// If end of the black list or immediately before ","?
size_t indexAfterHost = index + host.Length();
if (indexAfterHost == blackList.Length() ||
blackList[indexAfterHost] == ',') {
return true;
}
// If next character is '/', we need to check the path too.
// We assume the path in blacklist means "/foo" + "*".
if (blackList[indexAfterHost] == '/') {
int32_t endOfPath = blackList.Find(",", false, indexAfterHost);
nsDependentCSubstring::size_type length =
endOfPath < 0 ? static_cast<nsDependentCSubstring::size_type>(-1) :
endOfPath - indexAfterHost;
nsDependentCSubstring pathInBlackList(blackList,
indexAfterHost, length);
nsAutoCString filePath;
aURI->GetFilePath(filePath);
if (StringBeginsWith(filePath, pathInBlackList)) {
return true;
}
}
}
int32_t startIndexOfCurrentLevel = host[0] == '*' ? 1 : 0;
int32_t startIndexOfNextLevel =
host.Find(".", false, startIndexOfCurrentLevel + 1);
if (startIndexOfNextLevel <= 0) {
return false;
}
host = NS_LITERAL_CSTRING("*") +
nsDependentCSubstring(host, startIndexOfNextLevel);
}
}
#endif // #ifdef NIGHTLY_BUILD
nsresult
PresShell::DispatchEventToDOM(WidgetEvent* aEvent,
nsEventStatus* aStatus,
nsPresShellEventCB* aEventCB)
{
nsresult rv = NS_OK;
nsCOMPtr<nsINode> eventTarget = mCurrentEventContent.get();
nsPresShellEventCB* eventCBPtr = aEventCB;
if (!eventTarget) {
nsCOMPtr<nsIContent> targetContent;
if (mCurrentEventFrame) {
rv = mCurrentEventFrame->
GetContentForEvent(aEvent, getter_AddRefs(targetContent));
}
if (NS_SUCCEEDED(rv) && targetContent) {
eventTarget = do_QueryInterface(targetContent);
} else if (mDocument) {
eventTarget = do_QueryInterface(mDocument);
// If we don't have any content, the callback wouldn't probably
// do nothing.
eventCBPtr = nullptr;
}
}
if (eventTarget) {
if (aEvent->IsBlockedForFingerprintingResistance()) {
aEvent->mFlags.mOnlySystemGroupDispatchInContent = true;
#ifdef NIGHTLY_BUILD
} else if (aEvent->mMessage == eKeyPress &&
aEvent->mFlags.mOnlySystemGroupDispatchInContent) {
// If eKeyPress event is marked as not dispatched in the default event
// group in web content, it's caused by non-printable key or key
// combination. In this case, UI Events declares that browsers
// shouldn't dispatch keypress event. However, some web apps may be
// broken with this strict behavior due to historical issue.
// Therefore, we need to keep dispatching keypress event for such keys
// even with breaking the standard.
if (!mInitializedForceDispatchKeyPressEventsForNonPrintableKeys) {
mInitializedForceDispatchKeyPressEventsForNonPrintableKeys = true;
nsCOMPtr<nsIURI> uri = GetDocumentURIToCompareWithBlacklist(*this);
mForceDispatchKeyPressEventsForNonPrintableKeys =
DispatchKeyPressEventsEvenForNonPrintableKeys(uri);
}
if (mForceDispatchKeyPressEventsForNonPrintableKeys) {
aEvent->mFlags.mOnlySystemGroupDispatchInContent = false;
}
#endif // #ifdef NIGHTLY_BUILD
}
if (aEvent->mClass == eCompositionEventClass) {
IMEStateManager::DispatchCompositionEvent(eventTarget, mPresContext,
aEvent->AsCompositionEvent(),
aStatus, eventCBPtr);
} else {
EventDispatcher::Dispatch(eventTarget, mPresContext,
aEvent, nullptr, aStatus, eventCBPtr);
}
}
return rv;
}
void
PresShell::DispatchTouchEventToDOM(WidgetEvent* aEvent,
nsEventStatus* aStatus,
nsPresShellEventCB* aEventCB,
bool aTouchIsNew)
{
// calling preventDefault on touchstart or the first touchmove for a
// point prevents mouse events. calling it on the touchend should
// prevent click dispatching.
bool canPrevent = (aEvent->mMessage == eTouchStart) ||
(aEvent->mMessage == eTouchMove && aTouchIsNew) ||
(aEvent->mMessage == eTouchEnd);
bool preventDefault = false;
nsEventStatus tmpStatus = nsEventStatus_eIgnore;
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
// loop over all touches and dispatch events on any that have changed
for (dom::Touch* touch : touchEvent->mTouches) {
// We should remove all suppressed touch instances in
// TouchManager::PreHandleEvent.
MOZ_ASSERT(!touch->mIsTouchEventSuppressed);
if (!touch || !touch->mChanged) {
continue;
}
nsCOMPtr<EventTarget> targetPtr = touch->mTarget;
nsCOMPtr<nsIContent> content = do_QueryInterface(targetPtr);
if (!content) {
continue;
}
nsIDocument* doc = content->OwnerDoc();
nsIContent* capturingContent = GetCapturingContent();
if (capturingContent) {
if (capturingContent->OwnerDoc() != doc) {
// Wrong document, don't dispatch anything.
continue;
}
content = capturingContent;
}
// copy the event
WidgetTouchEvent newEvent(touchEvent->IsTrusted(),
touchEvent->mMessage, touchEvent->mWidget);
newEvent.AssignTouchEventData(*touchEvent, false);
newEvent.mTarget = targetPtr;
newEvent.mFlags.mHandledByAPZ = touchEvent->mFlags.mHandledByAPZ;
RefPtr<PresShell> contentPresShell;
if (doc == mDocument) {
contentPresShell = static_cast<PresShell*>(doc->GetShell());
if (contentPresShell) {
//XXXsmaug huge hack. Pushing possibly capturing content,
// even though event target is something else.
contentPresShell->PushCurrentEventInfo(
content->GetPrimaryFrame(), content);
}
}
nsPresContext *context = doc->GetPresContext();
if (!context) {
continue;
}
tmpStatus = nsEventStatus_eIgnore;
EventDispatcher::Dispatch(targetPtr, context,
&newEvent, nullptr, &tmpStatus, aEventCB);
if (nsEventStatus_eConsumeNoDefault == tmpStatus ||
newEvent.mFlags.mMultipleActionsPrevented) {
preventDefault = true;
}
if (newEvent.mFlags.mMultipleActionsPrevented) {
touchEvent->mFlags.mMultipleActionsPrevented = true;
}
if (contentPresShell) {
contentPresShell->PopCurrentEventInfo();
}
}
if (preventDefault && canPrevent) {
*aStatus = nsEventStatus_eConsumeNoDefault;
} else {
*aStatus = nsEventStatus_eIgnore;
}
}
// Dispatch event to content only (NOT full processing)
// See also HandleEventWithTarget which does full event processing.
nsresult
PresShell::HandleDOMEventWithTarget(nsIContent* aTargetContent,
WidgetEvent* aEvent,
nsEventStatus* aStatus)
{
nsresult rv = NS_OK;
PushCurrentEventInfo(nullptr, aTargetContent);
// Bug 41013: Check if the event should be dispatched to content.
// It's possible that we are in the middle of destroying the window
// and the js context is out of date. This check detects the case
// that caused a crash in bug 41013, but there may be a better way
// to handle this situation!
nsCOMPtr<nsISupports> container = mPresContext->GetContainerWeak();
if (container) {
// Dispatch event to content
rv = EventDispatcher::Dispatch(aTargetContent, mPresContext, aEvent,
nullptr, aStatus);
}
PopCurrentEventInfo();
return rv;
}
// See the method above.
nsresult
PresShell::HandleDOMEventWithTarget(nsIContent* aTargetContent,
Event* aEvent,
nsEventStatus* aStatus)
{
nsresult rv = NS_OK;
PushCurrentEventInfo(nullptr, aTargetContent);
nsCOMPtr<nsISupports> container = mPresContext->GetContainerWeak();
if (container) {
rv = EventDispatcher::DispatchDOMEvent(aTargetContent, nullptr, aEvent,
mPresContext, aStatus);
}
PopCurrentEventInfo();
return rv;
}
bool
PresShell::AdjustContextMenuKeyEvent(WidgetMouseEvent* aEvent)
{
#ifdef MOZ_XUL
// if a menu is open, open the context menu relative to the active item on the menu.
nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
if (pm) {
nsIFrame* popupFrame = pm->GetTopPopup(ePopupTypeMenu);
if (popupFrame) {
nsIFrame* itemFrame =
(static_cast<nsMenuPopupFrame *>(popupFrame))->GetCurrentMenuItem();
if (!itemFrame)
itemFrame = popupFrame;
nsCOMPtr<nsIWidget> widget = popupFrame->GetNearestWidget();
aEvent->mWidget = widget;
LayoutDeviceIntPoint widgetPoint = widget->WidgetToScreenOffset();
aEvent->mRefPoint = LayoutDeviceIntPoint::FromAppUnitsToNearest(
itemFrame->GetScreenRectInAppUnits().BottomLeft(),
itemFrame->PresContext()->AppUnitsPerDevPixel()) - widgetPoint;
mCurrentEventContent = itemFrame->GetContent();
mCurrentEventFrame = itemFrame;
return true;
}
}
#endif
// If we're here because of the key-equiv for showing context menus, we
// have to twiddle with the NS event to make sure the context menu comes
// up in the upper left of the relevant content area before we create
// the DOM event. Since we never call InitMouseEvent() on the event,
// the client X/Y will be 0,0. We can make use of that if the widget is null.
// Use the root view manager's widget since it's most likely to have one,
// and the coordinates returned by GetCurrentItemAndPositionForElement
// are relative to the widget of the root of the root view manager.
nsRootPresContext* rootPC = mPresContext->GetRootPresContext();
aEvent->mRefPoint = LayoutDeviceIntPoint(0, 0);
if (rootPC) {
rootPC->PresShell()->GetViewManager()->
GetRootWidget(getter_AddRefs(aEvent->mWidget));
if (aEvent->mWidget) {
// default the refpoint to the topleft of our document
nsPoint offset(0, 0);
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (rootFrame) {
nsView* view = rootFrame->GetClosestView(&offset);
offset += view->GetOffsetToWidget(aEvent->mWidget);
aEvent->mRefPoint =
LayoutDeviceIntPoint::FromAppUnitsToNearest(offset, mPresContext->AppUnitsPerDevPixel());
}
}
} else {
aEvent->mWidget = nullptr;
}
// see if we should use the caret position for the popup
LayoutDeviceIntPoint caretPoint;
// Beware! This may flush notifications via synchronous
// ScrollSelectionIntoView.
if (PrepareToUseCaretPosition(aEvent->mWidget, caretPoint)) {
// caret position is good
aEvent->mRefPoint = caretPoint;
return true;
}
// If we're here because of the key-equiv for showing context menus, we
// have to reset the event target to the currently focused element. Get it
// from the focus controller.
RefPtr<Element> currentFocus;
nsFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm) {
currentFocus = fm->GetFocusedElement();
}
// Reset event coordinates relative to focused frame in view
if (currentFocus) {
nsCOMPtr<nsIContent> currentPointElement;
GetCurrentItemAndPositionForElement(currentFocus,
getter_AddRefs(currentPointElement),
aEvent->mRefPoint,
aEvent->mWidget);
if (currentPointElement) {
mCurrentEventContent = currentPointElement;
mCurrentEventFrame = nullptr;
GetCurrentEventFrame();
}
}
return true;
}
// PresShell::PrepareToUseCaretPosition
//
// This checks to see if we should use the caret position for popup context
// menus. Returns true if the caret position should be used, and the
// coordinates of that position is returned in aTargetPt. This function
// will also scroll the window as needed to make the caret visible.
//
// The event widget should be the widget that generated the event, and
// whose coordinate system the resulting event's mRefPoint should be
// relative to. The returned point is in device pixels realtive to the
// widget passed in.
bool
PresShell::PrepareToUseCaretPosition(nsIWidget* aEventWidget,
LayoutDeviceIntPoint& aTargetPt)
{
nsresult rv;
// check caret visibility
RefPtr<nsCaret> caret = GetCaret();
NS_ENSURE_TRUE(caret, false);
bool caretVisible = caret->IsVisible();
if (!caretVisible)
return false;
// caret selection, this is a temporary weak reference, so no refcounting is
// needed
Selection* domSelection = caret->GetSelection();
NS_ENSURE_TRUE(domSelection, false);
// since the match could be an anonymous textnode inside a
// <textarea> or text <input>, we need to get the outer frame
// note: frames are not refcounted
nsIFrame* frame = nullptr; // may be nullptr
nsINode* node = domSelection->GetFocusNode();
NS_ENSURE_TRUE(node, false);
nsCOMPtr<nsIContent> content = nsIContent::FromNode(node);
if (content) {
nsIContent* nonNative = content->FindFirstNonChromeOnlyAccessContent();
content = nonNative;
}
if (content) {
// It seems like ScrollSelectionIntoView should be enough, but it's
// not. The problem is that scrolling the selection into view when it is
// below the current viewport will align the top line of the frame exactly
// with the bottom of the window. This is fine, BUT, the popup event causes
// the control to be re-focused which does this exact call to
// ScrollContentIntoView, which has a one-pixel disagreement of whether the
// frame is actually in view. The result is that the frame is aligned with
// the top of the window, but the menu is still at the bottom.
//
// Doing this call first forces the frame to be in view, eliminating the
// problem. The only difference in the result is that if your cursor is in
// an edit box below the current view, you'll get the edit box aligned with
// the top of the window. This is arguably better behavior anyway.
rv = ScrollContentIntoView(content,
nsIPresShell::ScrollAxis(
nsIPresShell::SCROLL_MINIMUM,
nsIPresShell::SCROLL_IF_NOT_VISIBLE),
nsIPresShell::ScrollAxis(
nsIPresShell::SCROLL_MINIMUM,
nsIPresShell::SCROLL_IF_NOT_VISIBLE),
nsIPresShell::SCROLL_OVERFLOW_HIDDEN);
NS_ENSURE_SUCCESS(rv, false);
frame = content->GetPrimaryFrame();
NS_WARNING_ASSERTION(frame, "No frame for focused content?");
}
// Actually scroll the selection (ie caret) into view. Note that this must
// be synchronous since we will be checking the caret position on the screen.
//
// Be easy about errors, and just don't scroll in those cases. Better to have
// the correct menu at a weird place than the wrong menu.
// After ScrollSelectionIntoView(), the pending notifications might be
// flushed and PresShell/PresContext/Frames may be dead. See bug 418470.
nsCOMPtr<nsISelectionController> selCon;
if (frame)
frame->GetSelectionController(GetPresContext(), getter_AddRefs(selCon));
else
selCon = static_cast<nsISelectionController *>(this);
if (selCon) {
rv = selCon->ScrollSelectionIntoView(nsISelectionController::SELECTION_NORMAL,
nsISelectionController::SELECTION_FOCUS_REGION,
nsISelectionController::SCROLL_SYNCHRONOUS);
NS_ENSURE_SUCCESS(rv, false);
}
nsPresContext* presContext = GetPresContext();
// get caret position relative to the closest view
nsRect caretCoords;
nsIFrame* caretFrame = caret->GetGeometry(&caretCoords);
if (!caretFrame)
return false;
nsPoint viewOffset;
nsView* view = caretFrame->GetClosestView(&viewOffset);
if (!view)
return false;
// and then get the caret coords relative to the event widget
if (aEventWidget) {
viewOffset += view->GetOffsetToWidget(aEventWidget);
}
caretCoords.MoveBy(viewOffset);
// caret coordinates are in app units, convert to pixels
aTargetPt.x =
presContext->AppUnitsToDevPixels(caretCoords.x + caretCoords.width);
aTargetPt.y =
presContext->AppUnitsToDevPixels(caretCoords.y + caretCoords.height);
// make sure rounding doesn't return a pixel which is outside the caret
// (e.g. one line lower)
aTargetPt.y -= 1;
return true;
}
void
PresShell::GetCurrentItemAndPositionForElement(Element* aFocusedElement,
nsIContent** aTargetToUse,
LayoutDeviceIntPoint& aTargetPt,
nsIWidget *aRootWidget)
{
nsCOMPtr<nsIContent> focusedContent = aFocusedElement;
ScrollContentIntoView(focusedContent,
ScrollAxis(),
ScrollAxis(),
nsIPresShell::SCROLL_OVERFLOW_HIDDEN);
nsPresContext* presContext = GetPresContext();
bool istree = false, checkLineHeight = true;
nscoord extraTreeY = 0;
#ifdef MOZ_XUL
// Set the position to just underneath the current item for multi-select
// lists or just underneath the selected item for single-select lists. If
// the element is not a list, or there is no selection, leave the position
// as is.
nsCOMPtr<nsIDOMXULSelectControlItemElement> item;
nsCOMPtr<nsIDOMXULMultiSelectControlElement> multiSelect =
do_QueryInterface(aFocusedElement);
if (multiSelect) {
checkLineHeight = false;
int32_t currentIndex;
multiSelect->GetCurrentIndex(&currentIndex);
if (currentIndex >= 0) {
RefPtr<nsXULElement> xulElement = nsXULElement::FromNode(focusedContent);
if (xulElement) {
nsCOMPtr<nsIBoxObject> box = xulElement->GetBoxObject(IgnoreErrors());
nsCOMPtr<nsITreeBoxObject> treeBox(do_QueryInterface(box));
// Tree view special case (tree items have no frames)
// Get the focused row and add its coordinates, which are already in pixels
// XXX Boris, should we create a new interface so that this doesn't
// need to know about trees? Something like nsINodelessChildCreator which
// could provide the current focus coordinates?
if (treeBox) {
treeBox->EnsureRowIsVisible(currentIndex);
int32_t firstVisibleRow, rowHeight;
treeBox->GetFirstVisibleRow(&firstVisibleRow);
treeBox->GetRowHeight(&rowHeight);
extraTreeY += nsPresContext::CSSPixelsToAppUnits(
(currentIndex - firstVisibleRow + 1) * rowHeight);
istree = true;
RefPtr<nsTreeColumns> cols;
treeBox->GetColumns(getter_AddRefs(cols));
if (cols) {
nsTreeColumn* col = cols->GetFirstColumn();
if (col) {
RefPtr<Element> colElement = col->Element();
nsIFrame* frame = colElement->GetPrimaryFrame();
if (frame) {
extraTreeY += frame->GetSize().height;
}
}
}
}
else {
multiSelect->GetCurrentItem(getter_AddRefs(item));
}
}
}
}
else {
// don't check menulists as the selected item will be inside a popup.
nsCOMPtr<nsIDOMXULMenuListElement> menulist = do_QueryInterface(aFocusedElement);
if (!menulist) {
nsCOMPtr<nsIDOMXULSelectControlElement> select =
do_QueryInterface(aFocusedElement);
if (select) {
checkLineHeight = false;
select->GetSelectedItem(getter_AddRefs(item));
}
}
}
if (item)
focusedContent = do_QueryInterface(item);
#endif
nsIFrame *frame = focusedContent->GetPrimaryFrame();
if (frame) {
NS_ASSERTION(frame->PresContext() == GetPresContext(),
"handling event for focused content that is not in our document?");
nsPoint frameOrigin(0, 0);
// Get the frame's origin within its view
nsView *view = frame->GetClosestView(&frameOrigin);
NS_ASSERTION(view, "No view for frame");
// View's origin relative the widget
if (aRootWidget) {
frameOrigin += view->GetOffsetToWidget(aRootWidget);
}
// Start context menu down and to the right from top left of frame
// use the lineheight. This is a good distance to move the context
// menu away from the top left corner of the frame. If we always
// used the frame height, the context menu could end up far away,
// for example when we're focused on linked images.
// On the other hand, we want to use the frame height if it's less
// than the current line height, so that the context menu appears
// associated with the correct frame.
nscoord extra = 0;
if (!istree) {
extra = frame->GetSize().height;
if (checkLineHeight) {
nsIScrollableFrame *scrollFrame =
nsLayoutUtils::GetNearestScrollableFrame(frame);
if (scrollFrame) {
nsSize scrollAmount = scrollFrame->GetLineScrollAmount();
nsIFrame* f = do_QueryFrame(scrollFrame);
int32_t APD = presContext->AppUnitsPerDevPixel();
int32_t scrollAPD = f->PresContext()->AppUnitsPerDevPixel();
scrollAmount = scrollAmount.ScaleToOtherAppUnits(scrollAPD, APD);
if (extra > scrollAmount.height) {
extra = scrollAmount.height;
}
}
}
}
aTargetPt.x = presContext->AppUnitsToDevPixels(frameOrigin.x);
aTargetPt.y = presContext->AppUnitsToDevPixels(
frameOrigin.y + extra + extraTreeY);
}
NS_IF_ADDREF(*aTargetToUse = focusedContent);
}
bool
PresShell::ShouldIgnoreInvalidation()
{
return mPaintingSuppressed || !mIsActive || mIsNeverPainting;
}
void
PresShell::WillPaint()
{
// Check the simplest things first. In particular, it's important to
// check mIsActive before making any of the more expensive calls such
// as GetRootPresContext, for the case of a browser with a large
// number of tabs.
// Don't bother doing anything if some viewmanager in our tree is painting
// while we still have painting suppressed or we are not active.
if (!mIsActive || mPaintingSuppressed || !IsVisible()) {
return;
}
nsRootPresContext* rootPresContext = mPresContext->GetRootPresContext();
if (!rootPresContext) {
// In some edge cases, such as when we don't have a root frame yet,
// we can't find the root prescontext. There's nothing to do in that
// case.
return;
}
rootPresContext->FlushWillPaintObservers();
if (mIsDestroying)
return;
// Process reflows, if we have them, to reduce flicker due to invalidates and
// reflow being interspersed. Note that we _do_ allow this to be
// interruptible; if we can't do all the reflows it's better to flicker a bit
// than to freeze up.
FlushPendingNotifications(ChangesToFlush(FlushType::InterruptibleLayout, false));
}
void
PresShell::WillPaintWindow()
{
nsRootPresContext* rootPresContext = mPresContext->GetRootPresContext();
if (rootPresContext != mPresContext) {
// This could be a popup's presshell. We don't allow plugins in popups
// so there's nothing to do here.
return;
}
#ifndef XP_MACOSX
rootPresContext->ApplyPluginGeometryUpdates();
#endif
}
void
PresShell::DidPaintWindow()
{
nsRootPresContext* rootPresContext = mPresContext->GetRootPresContext();
if (rootPresContext != mPresContext) {
// This could be a popup's presshell. No point in notifying XPConnect
// about compositing of popups.
return;
}
if (!mHasReceivedPaintMessage) {
mHasReceivedPaintMessage = true;
nsCOMPtr<nsIObserverService> obsvc = services::GetObserverService();
if (obsvc && mDocument) {
nsPIDOMWindowOuter* window = mDocument->GetWindow();
nsCOMPtr<nsIDOMChromeWindow> chromeWin(do_QueryInterface(window));
if (chromeWin) {
obsvc->NotifyObservers(chromeWin, "widget-first-paint", nullptr);
}
}
}
}
bool
PresShell::IsVisible()
{
if (!mIsActive || !mViewManager)
return false;
nsView* view = mViewManager->GetRootView();
if (!view)
return true;
// inner view of subdoc frame
view = view->GetParent();
if (!view)
return true;
// subdoc view
view = view->GetParent();
if (!view)
return true;
nsIFrame* frame = view->GetFrame();
if (!frame)
return true;
return frame->IsVisibleConsideringAncestors(nsIFrame::VISIBILITY_CROSS_CHROME_CONTENT_BOUNDARY);
}
void
PresShell::SuppressDisplayport(bool aEnabled)
{
if (aEnabled) {
mActiveSuppressDisplayport++;
} else if (mActiveSuppressDisplayport > 0) {
bool isSuppressed = IsDisplayportSuppressed();
mActiveSuppressDisplayport--;
if (isSuppressed && !IsDisplayportSuppressed()) {
// We unsuppressed the displayport, trigger a paint
if (nsIFrame* rootFrame = mFrameConstructor->GetRootFrame()) {
rootFrame->SchedulePaint();
}
}
}
}
static bool sDisplayPortSuppressionRespected = true;
void
PresShell::RespectDisplayportSuppression(bool aEnabled)
{
bool isSuppressed = IsDisplayportSuppressed();
sDisplayPortSuppressionRespected = aEnabled;
if (isSuppressed && !IsDisplayportSuppressed()) {
// We unsuppressed the displayport, trigger a paint
if (nsIFrame* rootFrame = mFrameConstructor->GetRootFrame()) {
rootFrame->SchedulePaint();
}
}
}
bool
PresShell::IsDisplayportSuppressed()
{
return sDisplayPortSuppressionRespected &&
mActiveSuppressDisplayport > 0;
}
nsresult
PresShell::GetAgentStyleSheets(nsTArray<RefPtr<StyleSheet>>& aSheets)
{
aSheets.Clear();
int32_t sheetCount = mStyleSet->SheetCount(SheetType::Agent);
if (!aSheets.SetCapacity(sheetCount, fallible)) {
return NS_ERROR_OUT_OF_MEMORY;
}
for (int32_t i = 0; i < sheetCount; ++i) {
StyleSheet* sheet = mStyleSet->StyleSheetAt(SheetType::Agent, i);
aSheets.AppendElement(sheet);
}
return NS_OK;
}
nsresult
PresShell::SetAgentStyleSheets(const nsTArray<RefPtr<StyleSheet>>& aSheets)
{
return mStyleSet->ReplaceSheets(SheetType::Agent, aSheets);
}
nsresult
PresShell::AddOverrideStyleSheet(StyleSheet* aSheet)
{
return mStyleSet->PrependStyleSheet(SheetType::Override, aSheet);
}
nsresult
PresShell::RemoveOverrideStyleSheet(StyleSheet* aSheet)
{
return mStyleSet->RemoveStyleSheet(SheetType::Override, aSheet);
}
static void
FreezeElement(nsISupports *aSupports, void * /* unused */)
{
nsCOMPtr<nsIObjectLoadingContent> olc(do_QueryInterface(aSupports));
if (olc) {
olc->StopPluginInstance();
}
}
static bool
FreezeSubDocument(nsIDocument *aDocument, void *aData)
{
nsIPresShell *shell = aDocument->GetShell();
if (shell)
shell->Freeze();
return true;
}
void
PresShell::Freeze()
{
mUpdateApproximateFrameVisibilityEvent.Revoke();
MaybeReleaseCapturingContent();
mDocument->EnumerateActivityObservers(FreezeElement, nullptr);
if (mCaret) {
SetCaretEnabled(false);
}
mPaintingSuppressed = true;
if (mDocument) {
mDocument->EnumerateSubDocuments(FreezeSubDocument, nullptr);
}
nsPresContext* presContext = GetPresContext();
if (presContext) {
presContext->DisableInteractionTimeRecording();
if (presContext->RefreshDriver()->GetPresContext() == presContext) {
presContext->RefreshDriver()->Freeze();
}
}
mFrozen = true;
if (mDocument) {
UpdateImageLockingState();
}
}
void
PresShell::FireOrClearDelayedEvents(bool aFireEvents)
{
mNoDelayedMouseEvents = false;
mNoDelayedKeyEvents = false;
if (!aFireEvents) {
mDelayedEvents.Clear();
return;
}
if (mDocument) {
nsCOMPtr<nsIDocument> doc = mDocument;
while (!mIsDestroying && mDelayedEvents.Length() &&
!doc->EventHandlingSuppressed()) {
nsAutoPtr<DelayedEvent> ev(mDelayedEvents[0].forget());
mDelayedEvents.RemoveElementAt(0);
if (ev->IsKeyPressEvent() && mIsLastKeyDownCanceled) {
continue;
}
ev->Dispatch();
}
if (!doc->EventHandlingSuppressed()) {
mDelayedEvents.Clear();
}
}
}
static void
ThawElement(nsISupports *aSupports, void *aShell)
{
nsCOMPtr<nsIObjectLoadingContent> olc(do_QueryInterface(aSupports));
if (olc) {
olc->AsyncStartPluginInstance();
}
}
static bool
ThawSubDocument(nsIDocument *aDocument, void *aData)
{
nsIPresShell *shell = aDocument->GetShell();
if (shell)
shell->Thaw();
return true;
}
void
PresShell::Thaw()
{
nsPresContext* presContext = GetPresContext();
if (presContext &&
presContext->RefreshDriver()->GetPresContext() == presContext) {
presContext->RefreshDriver()->Thaw();
}
mDocument->EnumerateActivityObservers(ThawElement, this);
if (mDocument)
mDocument->EnumerateSubDocuments(ThawSubDocument, nullptr);
// Get the activeness of our presshell, as this might have changed
// while we were in the bfcache
QueryIsActive();
// We're now unfrozen
mFrozen = false;
UpdateImageLockingState();
UnsuppressPainting();
}
//--------------------------------------------------------
// Start of protected and private methods on the PresShell
//--------------------------------------------------------
void
PresShell::MaybeScheduleReflow()
{
ASSERT_REFLOW_SCHEDULED_STATE();
if (mObservingLayoutFlushes || mIsDestroying || mIsReflowing ||
mDirtyRoots.IsEmpty())
return;
if (!mPresContext->HasPendingInterrupt() || !ScheduleReflowOffTimer()) {
ScheduleReflow();
}
ASSERT_REFLOW_SCHEDULED_STATE();
}
void
PresShell::ScheduleReflow()
{
ASSERT_REFLOW_SCHEDULED_STATE();
DoObserveLayoutFlushes();
ASSERT_REFLOW_SCHEDULED_STATE();
}
nsresult
PresShell::DidCauseReflow()
{
NS_ASSERTION(mChangeNestCount != 0, "Unexpected call to DidCauseReflow()");
--mChangeNestCount;
nsContentUtils::RemoveScriptBlocker();
return NS_OK;
}
void
PresShell::WillDoReflow()
{
mDocument->FlushUserFontSet();
mPresContext->FlushCounterStyles();
mPresContext->FlushFontFeatureValues();
mLastReflowStart = GetPerformanceNowUnclamped();
}
void
PresShell::DidDoReflow(bool aInterruptible)
{
HandlePostedReflowCallbacks(aInterruptible);
nsCOMPtr<nsIDocShell> docShell = mPresContext->GetDocShell();
if (docShell) {
DOMHighResTimeStamp now = GetPerformanceNowUnclamped();
docShell->NotifyReflowObservers(aInterruptible, mLastReflowStart, now);
}
if (sSynthMouseMove) {
SynthesizeMouseMove(false);
}
mPresContext->NotifyMissingFonts();
}
DOMHighResTimeStamp
PresShell::GetPerformanceNowUnclamped()
{
DOMHighResTimeStamp now = 0;
if (nsPIDOMWindowInner* window = mDocument->GetInnerWindow()) {
Performance* perf = window->GetPerformance();
if (perf) {
now = perf->NowUnclamped();
}
}
return now;
}
void
PresShell::sReflowContinueCallback(nsITimer* aTimer, void* aPresShell)
{
RefPtr<PresShell> self = static_cast<PresShell*>(aPresShell);
MOZ_ASSERT(aTimer == self->mReflowContinueTimer, "Unexpected timer");
self->mReflowContinueTimer = nullptr;
self->ScheduleReflow();
}
bool
PresShell::ScheduleReflowOffTimer()
{
MOZ_ASSERT(!mObservingLayoutFlushes, "Shouldn't get here");
ASSERT_REFLOW_SCHEDULED_STATE();
if (!mReflowContinueTimer) {
nsresult rv = NS_NewTimerWithFuncCallback(
getter_AddRefs(mReflowContinueTimer),
sReflowContinueCallback, this, 30,
nsITimer::TYPE_ONE_SHOT,
"sReflowContinueCallback",
mDocument->EventTargetFor(TaskCategory::Other));
return NS_SUCCEEDED(rv);
}
return true;
}
bool
PresShell::DoReflow(nsIFrame* target, bool aInterruptible)
{
#ifdef MOZ_GECKO_PROFILER
nsIURI* uri = mDocument->GetDocumentURI();
AUTO_PROFILER_LABEL_DYNAMIC_NSCSTRING(
"PresShell::DoReflow", LAYOUT,
uri ? uri->GetSpecOrDefault() : NS_LITERAL_CSTRING("N/A"));
#endif
gfxTextPerfMetrics* tp = mPresContext->GetTextPerfMetrics();
TimeStamp timeStart;
if (tp) {
tp->Accumulate();
tp->reflowCount++;
timeStart = TimeStamp::Now();
}
// Schedule a paint, but don't actually mark this frame as changed for
// retained DL building purposes. If any child frames get moved, then
// they will schedule paint again. We could probaby skip this, and just
// schedule a similar paint when a frame is deleted.
target->SchedulePaint(nsIFrame::PAINT_DEFAULT, false);
nsDocShell* docShell = static_cast<nsDocShell*>(GetPresContext()->GetDocShell());
RefPtr<TimelineConsumers> timelines = TimelineConsumers::Get();
bool isTimelineRecording = timelines && timelines->HasConsumer(docShell);
if (isTimelineRecording) {
timelines->AddMarkerForDocShell(docShell, "Reflow", MarkerTracingType::START);
}
#ifdef MOZ_GECKO_PROFILER
AutoProfilerTracing tracingLayoutFlush("Paint", "Reflow",
std::move(mReflowCause));
mReflowCause = nullptr;
#endif
if (mReflowContinueTimer) {
mReflowContinueTimer->Cancel();
mReflowContinueTimer = nullptr;
}
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
// CreateReferenceRenderingContext can return nullptr
RefPtr<gfxContext> rcx(CreateReferenceRenderingContext());
#ifdef DEBUG
mCurrentReflowRoot = target;
#endif
// If the target frame is the root of the frame hierarchy, then
// use all the available space. If it's simply a `reflow root',
// then use the target frame's size as the available space.
WritingMode wm = target->GetWritingMode();
LogicalSize size(wm);
if (target == rootFrame) {
size = LogicalSize(wm, mPresContext->GetVisibleArea().Size());
} else {
size = target->GetLogicalSize();
}
NS_ASSERTION(!target->GetNextInFlow() && !target->GetPrevInFlow(),
"reflow roots should never split");
// Don't pass size directly to the reflow state, since a
// constrained height implies page/column breaking.
LogicalSize reflowSize(wm, size.ISize(wm), NS_UNCONSTRAINEDSIZE);
ReflowInput reflowInput(mPresContext, target, rcx, reflowSize,
ReflowInput::CALLER_WILL_INIT);
reflowInput.mOrthogonalLimit = size.BSize(wm);
if (rootFrame == target) {
reflowInput.Init(mPresContext);
// When the root frame is being reflowed with unconstrained block-size
// (which happens when we're called from
// nsDocumentViewer::SizeToContent), we're effectively doing a
// resize in the block direction, since it changes the meaning of
// percentage block-sizes even if no block-sizes actually changed.
// The same applies when we reflow again after that computation. This is
// an unusual case, and isn't caught by ReflowInput::InitResizeFlags.
bool hasUnconstrainedBSize = size.BSize(wm) == NS_UNCONSTRAINEDSIZE;
if (hasUnconstrainedBSize || mLastRootReflowHadUnconstrainedBSize) {
reflowInput.SetBResize(true);
}
mLastRootReflowHadUnconstrainedBSize = hasUnconstrainedBSize;
} else {
// Initialize reflow state with current used border and padding,
// in case this was set specially by the parent frame when the reflow root
// was reflowed by its parent.
nsMargin currentBorder = target->GetUsedBorder();
nsMargin currentPadding = target->GetUsedPadding();
reflowInput.Init(mPresContext, nullptr, &currentBorder, &currentPadding);
}
// fix the computed height
NS_ASSERTION(reflowInput.ComputedPhysicalMargin() == nsMargin(0, 0, 0, 0),
"reflow state should not set margin for reflow roots");
if (size.BSize(wm) != NS_UNCONSTRAINEDSIZE) {
nscoord computedBSize =
size.BSize(wm) - reflowInput.ComputedLogicalBorderPadding().BStartEnd(wm);
computedBSize = std::max(computedBSize, 0);
reflowInput.SetComputedBSize(computedBSize);
}
NS_ASSERTION(reflowInput.ComputedISize() ==
size.ISize(wm) -
reflowInput.ComputedLogicalBorderPadding().IStartEnd(wm),
"reflow state computed incorrect inline size");
mPresContext->ReflowStarted(aInterruptible);
mIsReflowing = true;
nsReflowStatus status;
ReflowOutput desiredSize(reflowInput);
target->Reflow(mPresContext, desiredSize, reflowInput, status);
// If an incremental reflow is initiated at a frame other than the
// root frame, then its desired size had better not change! If it's
// initiated at the root, then the size better not change unless its
// height was unconstrained to start with.
nsRect boundsRelativeToTarget = nsRect(0, 0, desiredSize.Width(), desiredSize.Height());
NS_ASSERTION((target == rootFrame &&
size.BSize(wm) == NS_UNCONSTRAINEDSIZE) ||
(desiredSize.ISize(wm) == size.ISize(wm) &&
desiredSize.BSize(wm) == size.BSize(wm)),
"non-root frame's desired size changed during an "
"incremental reflow");
NS_ASSERTION(target == rootFrame ||
desiredSize.VisualOverflow().IsEqualInterior(boundsRelativeToTarget),
"non-root reflow roots must not have visible overflow");
NS_ASSERTION(target == rootFrame ||
desiredSize.ScrollableOverflow().IsEqualEdges(boundsRelativeToTarget),
"non-root reflow roots must not have scrollable overflow");
NS_ASSERTION(status.IsEmpty(),
"reflow roots should never split");
target->SetSize(boundsRelativeToTarget.Size());
// Always use boundsRelativeToTarget here, not desiredSize.GetVisualOverflowArea(),
// because for root frames (where they could be different, since root frames
// are allowed to have overflow) the root view bounds need to match the
// viewport bounds; the view manager "window dimensions" code depends on it.
nsContainerFrame::SyncFrameViewAfterReflow(mPresContext, target,
target->GetView(),
boundsRelativeToTarget);
nsContainerFrame::SyncWindowProperties(mPresContext, target,
target->GetView(), rcx,
nsContainerFrame::SET_ASYNC);
target->DidReflow(mPresContext, nullptr);
if (target == rootFrame && size.BSize(wm) == NS_UNCONSTRAINEDSIZE) {
mPresContext->SetVisibleArea(boundsRelativeToTarget);
}
#ifdef DEBUG
mCurrentReflowRoot = nullptr;
#endif
NS_ASSERTION(mPresContext->HasPendingInterrupt() ||
mFramesToDirty.Count() == 0,
"Why do we need to dirty anything if not interrupted?");
mIsReflowing = false;
bool interrupted = mPresContext->HasPendingInterrupt();
if (interrupted) {
// Make sure target gets reflowed again.
for (auto iter = mFramesToDirty.Iter(); !iter.Done(); iter.Next()) {
// Mark frames dirty until target frame.
nsPtrHashKey<nsIFrame>* p = iter.Get();
for (nsIFrame* f = p->GetKey();
f && !NS_SUBTREE_DIRTY(f);
f = f->GetParent()) {
f->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
if (f == target) {
break;
}
}
}
NS_ASSERTION(NS_SUBTREE_DIRTY(target), "Why is the target not dirty?");
mDirtyRoots.AppendElement(target);
SetNeedLayoutFlush();
// Clear mFramesToDirty after we've done the NS_SUBTREE_DIRTY(target)
// assertion so that if it fails it's easier to see what's going on.
#ifdef NOISY_INTERRUPTIBLE_REFLOW
printf("mFramesToDirty.Count() == %u\n", mFramesToDirty.Count());
#endif /* NOISY_INTERRUPTIBLE_REFLOW */
mFramesToDirty.Clear();
// Any FlushPendingNotifications with interruptible reflows
// should be suppressed now. We don't want to do extra reflow work
// before our reflow event happens.
mWasLastReflowInterrupted = true;
MaybeScheduleReflow();
}
// dump text perf metrics for reflows with significant text processing
if (tp) {
if (tp->current.numChars > 100) {
TimeDuration reflowTime = TimeStamp::Now() - timeStart;
LogTextPerfStats(tp, this, tp->current,
reflowTime.ToMilliseconds(), eLog_reflow, nullptr);
}
tp->Accumulate();
}
if (isTimelineRecording) {
timelines->AddMarkerForDocShell(docShell, "Reflow", MarkerTracingType::END);
}
return !interrupted;
}
#ifdef DEBUG
void
PresShell::DoVerifyReflow()
{
if (GetVerifyReflowEnable()) {
// First synchronously render what we have so far so that we can
// see it.
nsView* rootView = mViewManager->GetRootView();
mViewManager->InvalidateView(rootView);
FlushPendingNotifications(FlushType::Layout);
mInVerifyReflow = true;
bool ok = VerifyIncrementalReflow();
mInVerifyReflow = false;
if (VERIFY_REFLOW_ALL & gVerifyReflowFlags) {
printf("ProcessReflowCommands: finished (%s)\n",
ok ? "ok" : "failed");
}
if (!mDirtyRoots.IsEmpty()) {
printf("XXX yikes! reflow commands queued during verify-reflow\n");
}
}
}
#endif
// used with Telemetry metrics
#define NS_LONG_REFLOW_TIME_MS 5000
bool
PresShell::ProcessReflowCommands(bool aInterruptible)
{
if (mDirtyRoots.IsEmpty() && !mShouldUnsuppressPainting) {
// Nothing to do; bail out
return true;
}
mozilla::TimeStamp timerStart = mozilla::TimeStamp::Now();
bool interrupted = false;
if (!mDirtyRoots.IsEmpty()) {
#ifdef DEBUG
if (VERIFY_REFLOW_DUMP_COMMANDS & gVerifyReflowFlags) {
printf("ProcessReflowCommands: begin incremental reflow\n");
}
#endif
// If reflow is interruptible, then make a note of our deadline.
const PRIntervalTime deadline = aInterruptible
? PR_IntervalNow() + PR_MicrosecondsToInterval(gMaxRCProcessingTime)
: (PRIntervalTime)0;
// Scope for the reflow entry point
{
nsAutoScriptBlocker scriptBlocker;
WillDoReflow();
AUTO_LAYOUT_PHASE_ENTRY_POINT(GetPresContext(), Reflow);
nsViewManager::AutoDisableRefresh refreshBlocker(mViewManager);
do {
// Send an incremental reflow notification to the target frame.
int32_t idx = mDirtyRoots.Length() - 1;
nsIFrame *target = mDirtyRoots[idx];
mDirtyRoots.RemoveElementAt(idx);
if (!NS_SUBTREE_DIRTY(target)) {
// It's not dirty anymore, which probably means the notification
// was posted in the middle of a reflow (perhaps with a reflow
// root in the middle). Don't do anything.
continue;
}
interrupted = !DoReflow(target, aInterruptible);
// Keep going until we're out of reflow commands, or we've run
// past our deadline, or we're interrupted.
} while (!interrupted && !mDirtyRoots.IsEmpty() &&
(!aInterruptible || PR_IntervalNow() < deadline));
interrupted = !mDirtyRoots.IsEmpty();
}
// Exiting the scriptblocker might have killed us
if (!mIsDestroying) {
DidDoReflow(aInterruptible);
}
// DidDoReflow might have killed us
if (!mIsDestroying) {
#ifdef DEBUG
if (VERIFY_REFLOW_DUMP_COMMANDS & gVerifyReflowFlags) {
printf("\nPresShell::ProcessReflowCommands() finished: this=%p\n",
(void*)this);
}
DoVerifyReflow();
#endif
// If any new reflow commands were enqueued during the reflow, schedule
// another reflow event to process them. Note that we want to do this
// after DidDoReflow(), since that method can change whether there are
// dirty roots around by flushing, and there's no point in posting a
// reflow event just to have the flush revoke it.
if (!mDirtyRoots.IsEmpty()) {
MaybeScheduleReflow();
// And record that we might need flushing
SetNeedLayoutFlush();
}
}
}
if (!mIsDestroying && mShouldUnsuppressPainting &&
mDirtyRoots.IsEmpty()) {
// We only unlock if we're out of reflows. It's pointless
// to unlock if reflows are still pending, since reflows
// are just going to thrash the frames around some more. By
// waiting we avoid an overeager "jitter" effect.
mShouldUnsuppressPainting = false;
UnsuppressAndInvalidate();
}
if (mDocument->GetRootElement()) {
TimeDuration elapsed = TimeStamp::Now() - timerStart;
int32_t intElapsed = int32_t(elapsed.ToMilliseconds());
if (intElapsed > NS_LONG_REFLOW_TIME_MS) {
Telemetry::Accumulate(Telemetry::LONG_REFLOW_INTERRUPTIBLE,
aInterruptible ? 1 : 0);
}
}
return !interrupted;
}
void
PresShell::WindowSizeMoveDone()
{
if (mPresContext) {
EventStateManager::ClearGlobalActiveContent(nullptr);
ClearMouseCapture(nullptr);
}
}
#ifdef MOZ_XUL
/*
* It's better to add stuff to the |DidSetComputedStyle| method of the
* relevant frames than adding it here. These methods should (ideally,
* anyway) go away.
*/
// Return value says whether to walk children.
typedef bool (*frameWalkerFn)(nsIFrame* aFrame);
static bool
ReResolveMenusAndTrees(nsIFrame* aFrame)
{
// Trees have a special style cache that needs to be flushed when
// the theme changes.
nsTreeBodyFrame* treeBody = do_QueryFrame(aFrame);
if (treeBody)
treeBody->ClearStyleAndImageCaches();
// We deliberately don't re-resolve style on a menu's popup
// sub-content, since doing so slows menus to a crawl. That means we
// have to special-case them on a skin switch, and ensure that the
// popup frames just get destroyed completely.
nsMenuFrame* menu = do_QueryFrame(aFrame);
if (menu)
menu->CloseMenu(true);
return true;
}
static bool
ReframeImageBoxes(nsIFrame* aFrame)
{
if (aFrame->IsImageBoxFrame()) {
aFrame->PresContext()->RestyleManager()->PostRestyleEvent(
aFrame->GetContent()->AsElement(),
nsRestyleHint(0),
nsChangeHint_ReconstructFrame);
return false; // don't walk descendants
}
return true; // walk descendants
}
static void
WalkFramesThroughPlaceholders(nsPresContext* aPresContext,
nsIFrame* aFrame,
frameWalkerFn aFunc)
{
bool walkChildren = (*aFunc)(aFrame);
if (!walkChildren)
return;
nsIFrame::ChildListIterator lists(aFrame);
for (; !lists.IsDone(); lists.Next()) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsIFrame* child = childFrames.get();
if (!(child->GetStateBits() & NS_FRAME_OUT_OF_FLOW)) {
// only do frames that are in flow, and recur through the
// out-of-flows of placeholders.
WalkFramesThroughPlaceholders(aPresContext,
nsPlaceholderFrame::GetRealFrameFor(child),
aFunc);
}
}
}
}
#endif
NS_IMETHODIMP
PresShell::Observe(nsISupports* aSubject,
const char* aTopic,
const char16_t* aData)
{
if (mIsDestroying) {
NS_WARNING("our observers should have been unregistered by now");
return NS_OK;
}
#ifdef MOZ_XUL
if (!nsCRT::strcmp(aTopic, "chrome-flush-skin-caches")) {
// Need to null-check because "chrome-flush-skin-caches" can happen
// at interesting times during startup.
if (nsIFrame* rootFrame = mFrameConstructor->GetRootFrame()) {
NS_ASSERTION(mViewManager, "View manager must exist");
WalkFramesThroughPlaceholders(
mPresContext, rootFrame, ReResolveMenusAndTrees);
// Because "chrome:" URL equality is messy, reframe image box
// frames (hack!).
WalkFramesThroughPlaceholders(
mPresContext, rootFrame, ReframeImageBoxes);
}
return NS_OK;
}
#endif
if (!nsCRT::strcmp(aTopic, "memory-pressure")) {
if (!AssumeAllFramesVisible() && mPresContext->IsRootContentDocument()) {
DoUpdateApproximateFrameVisibility(/* aRemoveOnly = */ true);
}
return NS_OK;
}
if (!nsCRT::strcmp(aTopic, NS_WIDGET_WAKE_OBSERVER_TOPIC)) {
mLastOSWake = TimeStamp::Now();
return NS_OK;
}
// For parent process, user may expect the UI is interactable after a
// tab (previously opened page or home page) has restored.
if (!nsCRT::strcmp(aTopic, "sessionstore-one-or-no-tab-restored")) {
MOZ_ASSERT(XRE_IsParentProcess());
sProcessInteractable = true;
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os) {
os->RemoveObserver(this, "sessionstore-one-or-no-tab-restored");
}
return NS_OK;
}
if (!nsCRT::strcmp(aTopic, "font-info-updated")) {
mPresContext->ForceReflowForFontInfoUpdate();
return NS_OK;
}
NS_WARNING("unrecognized topic in PresShell::Observe");
return NS_ERROR_FAILURE;
}
bool
nsIPresShell::AddRefreshObserver(nsARefreshObserver* aObserver,
FlushType aFlushType)
{
nsPresContext* presContext = GetPresContext();
return presContext &&
presContext->RefreshDriver()->AddRefreshObserver(aObserver, aFlushType);
}
bool
nsIPresShell::RemoveRefreshObserver(nsARefreshObserver* aObserver,
FlushType aFlushType)
{
nsPresContext* presContext = GetPresContext();
return presContext &&
presContext->RefreshDriver()->RemoveRefreshObserver(aObserver, aFlushType);
}
/* virtual */ bool
nsIPresShell::AddPostRefreshObserver(nsAPostRefreshObserver* aObserver)
{
nsPresContext* presContext = GetPresContext();
if (!presContext) {
return false;
}
presContext->RefreshDriver()->AddPostRefreshObserver(aObserver);
return true;
}
/* virtual */ bool
nsIPresShell::RemovePostRefreshObserver(nsAPostRefreshObserver* aObserver)
{
nsPresContext* presContext = GetPresContext();
if (!presContext) {
return false;
}
presContext->RefreshDriver()->RemovePostRefreshObserver(aObserver);
return true;
}
void
nsIPresShell::DoObserveStyleFlushes()
{
MOZ_ASSERT(!ObservingStyleFlushes());
mObservingStyleFlushes = true;
if (MOZ_LIKELY(!mDocument->GetBFCacheEntry())) {
mPresContext->RefreshDriver()->AddStyleFlushObserver(this);
}
}
void
nsIPresShell::DoObserveLayoutFlushes()
{
MOZ_ASSERT(!ObservingLayoutFlushes());
mObservingLayoutFlushes = true;
if (MOZ_LIKELY(!mDocument->GetBFCacheEntry())) {
mPresContext->RefreshDriver()->AddLayoutFlushObserver(this);
}
}
//------------------------------------------------------
// End of protected and private methods on the PresShell
//------------------------------------------------------
//------------------------------------------------------------------
//-- Delayed event Classes Impls
//------------------------------------------------------------------
PresShell::DelayedInputEvent::DelayedInputEvent() :
DelayedEvent(),
mEvent(nullptr)
{
}
PresShell::DelayedInputEvent::~DelayedInputEvent()
{
delete mEvent;
}
void
PresShell::DelayedInputEvent::Dispatch()
{
if (!mEvent || !mEvent->mWidget) {
return;
}
nsCOMPtr<nsIWidget> widget = mEvent->mWidget;
nsEventStatus status;
widget->DispatchEvent(mEvent, status);
}
PresShell::DelayedMouseEvent::DelayedMouseEvent(WidgetMouseEvent* aEvent) :
DelayedInputEvent()
{
WidgetMouseEvent* mouseEvent =
new WidgetMouseEvent(aEvent->IsTrusted(),
aEvent->mMessage,
aEvent->mWidget,
aEvent->mReason,
aEvent->mContextMenuTrigger);
mouseEvent->AssignMouseEventData(*aEvent, false);
mEvent = mouseEvent;
}
PresShell::DelayedKeyEvent::DelayedKeyEvent(WidgetKeyboardEvent* aEvent) :
DelayedInputEvent()
{
WidgetKeyboardEvent* keyEvent =
new WidgetKeyboardEvent(aEvent->IsTrusted(),
aEvent->mMessage,
aEvent->mWidget);
keyEvent->AssignKeyEventData(*aEvent, false);
keyEvent->mFlags.mIsSynthesizedForTests = aEvent->mFlags.mIsSynthesizedForTests;
keyEvent->mFlags.mIsSuppressedOrDelayed = true;
mEvent = keyEvent;
}
bool
PresShell::DelayedKeyEvent::IsKeyPressEvent()
{
return mEvent->mMessage == eKeyPress;
}
// Start of DEBUG only code
#ifdef DEBUG
static void
LogVerifyMessage(nsIFrame* k1, nsIFrame* k2, const char* aMsg)
{
nsAutoString n1, n2;
if (k1) {
k1->GetFrameName(n1);
} else {
n1.AssignLiteral(u"(null)");
}
if (k2) {
k2->GetFrameName(n2);
} else {
n2.AssignLiteral(u"(null)");
}
printf("verifyreflow: %s %p != %s %p %s\n",
NS_LossyConvertUTF16toASCII(n1).get(), (void*)k1,
NS_LossyConvertUTF16toASCII(n2).get(), (void*)k2, aMsg);
}
static void
LogVerifyMessage(nsIFrame* k1, nsIFrame* k2, const char* aMsg,
const nsRect& r1, const nsRect& r2)
{
printf("VerifyReflow Error:\n");
nsAutoString name;
if (k1) {
k1->GetFrameName(name);
printf(" %s %p ", NS_LossyConvertUTF16toASCII(name).get(), (void*)k1);
}
printf("{%d, %d, %d, %d} != \n", r1.x, r1.y, r1.width, r1.height);
if (k2) {
k2->GetFrameName(name);
printf(" %s %p ", NS_LossyConvertUTF16toASCII(name).get(), (void*)k2);
}
printf("{%d, %d, %d, %d}\n %s\n",
r2.x, r2.y, r2.width, r2.height, aMsg);
}
static void
LogVerifyMessage(nsIFrame* k1, nsIFrame* k2, const char* aMsg,
const nsIntRect& r1, const nsIntRect& r2)
{
printf("VerifyReflow Error:\n");
nsAutoString name;
if (k1) {
k1->GetFrameName(name);
printf(" %s %p ", NS_LossyConvertUTF16toASCII(name).get(), (void*)k1);
}
printf("{%d, %d, %d, %d} != \n", r1.x, r1.y, r1.width, r1.height);
if (k2) {
k2->GetFrameName(name);
printf(" %s %p ", NS_LossyConvertUTF16toASCII(name).get(), (void*)k2);
}
printf("{%d, %d, %d, %d}\n %s\n",
r2.x, r2.y, r2.width, r2.height, aMsg);
}
static bool
CompareTrees(nsPresContext* aFirstPresContext, nsIFrame* aFirstFrame,
nsPresContext* aSecondPresContext, nsIFrame* aSecondFrame)
{
if (!aFirstPresContext || !aFirstFrame || !aSecondPresContext || !aSecondFrame)
return true;
// XXX Evil hack to reduce false positives; I can't seem to figure
// out how to flush scrollbar changes correctly
//if (aFirstFrame->IsScrollbarFrame())
// return true;
bool ok = true;
nsIFrame::ChildListIterator lists1(aFirstFrame);
nsIFrame::ChildListIterator lists2(aSecondFrame);
do {
const nsFrameList& kids1 = !lists1.IsDone() ? lists1.CurrentList() : nsFrameList();
const nsFrameList& kids2 = !lists2.IsDone() ? lists2.CurrentList() : nsFrameList();
int32_t l1 = kids1.GetLength();
int32_t l2 = kids2.GetLength();
if (l1 != l2) {
ok = false;
LogVerifyMessage(kids1.FirstChild(), kids2.FirstChild(),
"child counts don't match: ");
printf("%d != %d\n", l1, l2);
if (0 == (VERIFY_REFLOW_ALL & gVerifyReflowFlags)) {
break;
}
}
LayoutDeviceIntRect r1, r2;
nsView* v1;
nsView* v2;
for (nsFrameList::Enumerator e1(kids1), e2(kids2);
;
e1.Next(), e2.Next()) {
nsIFrame* k1 = e1.get();
nsIFrame* k2 = e2.get();
if (((nullptr == k1) && (nullptr != k2)) ||
((nullptr != k1) && (nullptr == k2))) {
ok = false;
LogVerifyMessage(k1, k2, "child lists are different\n");
break;
}
else if (nullptr != k1) {
// Verify that the frames are the same size
if (!k1->GetRect().IsEqualInterior(k2->GetRect())) {
ok = false;
LogVerifyMessage(k1, k2, "(frame rects)", k1->GetRect(), k2->GetRect());
}
// Make sure either both have views or neither have views; if they
// do have views, make sure the views are the same size. If the
// views have widgets, make sure they both do or neither does. If
// they do, make sure the widgets are the same size.
v1 = k1->GetView();
v2 = k2->GetView();
if (((nullptr == v1) && (nullptr != v2)) ||
((nullptr != v1) && (nullptr == v2))) {
ok = false;
LogVerifyMessage(k1, k2, "child views are not matched\n");
}
else if (nullptr != v1) {
if (!v1->GetBounds().IsEqualInterior(v2->GetBounds())) {
LogVerifyMessage(k1, k2, "(view rects)", v1->GetBounds(), v2->GetBounds());
}
nsIWidget* w1 = v1->GetWidget();
nsIWidget* w2 = v2->GetWidget();
if (((nullptr == w1) && (nullptr != w2)) ||
((nullptr != w1) && (nullptr == w2))) {
ok = false;
LogVerifyMessage(k1, k2, "child widgets are not matched\n");
}
else if (nullptr != w1) {
r1 = w1->GetBounds();
r2 = w2->GetBounds();
if (!r1.IsEqualEdges(r2)) {
LogVerifyMessage(k1, k2, "(widget rects)",
r1.ToUnknownRect(), r2.ToUnknownRect());
}
}
}
if (!ok && (0 == (VERIFY_REFLOW_ALL & gVerifyReflowFlags))) {
break;
}
// XXX Should perhaps compare their float managers.
// Compare the sub-trees too
if (!CompareTrees(aFirstPresContext, k1, aSecondPresContext, k2)) {
ok = false;
if (0 == (VERIFY_REFLOW_ALL & gVerifyReflowFlags)) {
break;
}
}
}
else {
break;
}
}
if (!ok && (0 == (VERIFY_REFLOW_ALL & gVerifyReflowFlags))) {
break;
}
lists1.Next();
lists2.Next();
if (lists1.IsDone() != lists2.IsDone() ||
(!lists1.IsDone() && lists1.CurrentID() != lists2.CurrentID())) {
if (0 == (VERIFY_REFLOW_ALL & gVerifyReflowFlags)) {
ok = false;
}
LogVerifyMessage(kids1.FirstChild(), kids2.FirstChild(),
"child list names are not matched: ");
fprintf(stdout, "%s != %s\n",
!lists1.IsDone() ? mozilla::layout::ChildListName(lists1.CurrentID()) : "(null)",
!lists2.IsDone() ? mozilla::layout::ChildListName(lists2.CurrentID()) : "(null)");
break;
}
} while (ok && !lists1.IsDone());
return ok;
}
#endif
#if 0
static nsIFrame*
FindTopFrame(nsIFrame* aRoot)
{
if (aRoot) {
nsIContent* content = aRoot->GetContent();
if (content) {
nsAtom* tag;
content->GetTag(tag);
if (nullptr != tag) {
NS_RELEASE(tag);
return aRoot;
}
}
// Try one of the children
for (nsIFrame* kid : aRoot->PrincipalChildList()) {
nsIFrame* result = FindTopFrame(kid);
if (nullptr != result) {
return result;
}
}
}
return nullptr;
}
#endif
#ifdef DEBUG
static void
CopySheetsIntoClone(ServoStyleSet* aSet, ServoStyleSet* aClone)
{
int32_t i, n = aSet->SheetCount(SheetType::Override);
for (i = 0; i < n; i++) {
StyleSheet* ss = aSet->StyleSheetAt(SheetType::Override, i);
if (ss)
aClone->AppendStyleSheet(SheetType::Override, ss);
}
// The document expects to insert document stylesheets itself
#if 0
n = aSet->SheetCount(SheetType::Doc);
for (i = 0; i < n; i++) {
StyleSheet* ss = aSet->StyleSheetAt(SheetType::Doc, i);
if (ss)
aClone->AddDocStyleSheet(ss, mDocument);
}
#endif
n = aSet->SheetCount(SheetType::User);
for (i = 0; i < n; i++) {
StyleSheet* ss = aSet->StyleSheetAt(SheetType::User, i);
if (ss)
aClone->AppendStyleSheet(SheetType::User, ss);
}
n = aSet->SheetCount(SheetType::Agent);
for (i = 0; i < n; i++) {
StyleSheet* ss = aSet->StyleSheetAt(SheetType::Agent, i);
if (ss)
aClone->AppendStyleSheet(SheetType::Agent, ss);
}
}
UniquePtr<ServoStyleSet>
PresShell::CloneStyleSet(ServoStyleSet* aSet)
{
auto clone = MakeUnique<ServoStyleSet>();
CopySheetsIntoClone(aSet, clone.get());
return clone;
}
// After an incremental reflow, we verify the correctness by doing a
// full reflow into a fresh frame tree.
bool
PresShell::VerifyIncrementalReflow()
{
if (VERIFY_REFLOW_NOISY & gVerifyReflowFlags) {
printf("Building Verification Tree...\n");
}
// Create a presentation context to view the new frame tree
RefPtr<nsPresContext> cx =
new nsRootPresContext(mDocument, mPresContext->IsPaginated() ?
nsPresContext::eContext_PrintPreview :
nsPresContext::eContext_Galley);
NS_ENSURE_TRUE(cx, false);
nsDeviceContext *dc = mPresContext->DeviceContext();
nsresult rv = cx->Init(dc);
NS_ENSURE_SUCCESS(rv, false);
// Get our scrolling preference
nsView* rootView = mViewManager->GetRootView();
NS_ENSURE_TRUE(rootView->HasWidget(), false);
nsIWidget* parentWidget = rootView->GetWidget();
// Create a new view manager.
RefPtr<nsViewManager> vm = new nsViewManager();
NS_ENSURE_TRUE(vm, false);
rv = vm->Init(dc);
NS_ENSURE_SUCCESS(rv, false);
// Create a child window of the parent that is our "root view/window"
// Create a view
nsRect tbounds = mPresContext->GetVisibleArea();
nsView* view = vm->CreateView(tbounds, nullptr);
NS_ENSURE_TRUE(view, false);
//now create the widget for the view
rv = view->CreateWidgetForParent(parentWidget, nullptr, true);
NS_ENSURE_SUCCESS(rv, false);
// Setup hierarchical relationship in view manager
vm->SetRootView(view);
// Make the new presentation context the same size as our
// presentation context.
cx->SetVisibleArea(mPresContext->GetVisibleArea());
// Create a new presentation shell to view the document. Use the
// exact same style information that this document has.
UniquePtr<ServoStyleSet> newSet = CloneStyleSet(StyleSet());
nsCOMPtr<nsIPresShell> sh = mDocument->CreateShell(cx, vm, std::move(newSet));
NS_ENSURE_TRUE(sh, false);
// Note that after we create the shell, we must make sure to destroy it
sh->SetVerifyReflowEnable(false); // turn off verify reflow while we're reflowing the test frame tree
vm->SetPresShell(sh);
{
nsAutoCauseReflowNotifier crNotifier(this);
sh->Initialize();
}
mDocument->BindingManager()->ProcessAttachedQueue();
sh->FlushPendingNotifications(FlushType::Layout);
sh->SetVerifyReflowEnable(true); // turn on verify reflow again now that we're done reflowing the test frame tree
// Force the non-primary presshell to unsuppress; it doesn't want to normally
// because it thinks it's hidden
((PresShell*)sh.get())->mPaintingSuppressed = false;
if (VERIFY_REFLOW_NOISY & gVerifyReflowFlags) {
printf("Verification Tree built, comparing...\n");
}
// Now that the document has been reflowed, use its frame tree to
// compare against our frame tree.
nsIFrame* root1 = mFrameConstructor->GetRootFrame();
nsIFrame* root2 = sh->GetRootFrame();
bool ok = CompareTrees(mPresContext, root1, cx, root2);
if (!ok && (VERIFY_REFLOW_NOISY & gVerifyReflowFlags)) {
printf("Verify reflow failed, primary tree:\n");
root1->List(stdout, 0);
printf("Verification tree:\n");
root2->List(stdout, 0);
}
#if 0
// Sample code for dumping page to png
// XXX Needs to be made more flexible
if (!ok) {
nsString stra;
static int num = 0;
stra.AppendLiteral("C:\\mozilla\\mozilla\\debug\\filea");
stra.AppendInt(num);
stra.AppendLiteral(".png");
gfxUtils::WriteAsPNG(sh, stra);
nsString strb;
strb.AppendLiteral("C:\\mozilla\\mozilla\\debug\\fileb");
strb.AppendInt(num);
strb.AppendLiteral(".png");
gfxUtils::WriteAsPNG(sh, strb);
++num;
}
#endif
sh->EndObservingDocument();
sh->Destroy();
if (VERIFY_REFLOW_NOISY & gVerifyReflowFlags) {
printf("Finished Verifying Reflow...\n");
}
return ok;
}
// Layout debugging hooks
void
PresShell::ListComputedStyles(FILE *out, int32_t aIndent)
{
nsIFrame* rootFrame = GetRootFrame();
if (rootFrame) {
rootFrame->Style()->List(out, aIndent);
}
// The root element's frame's ComputedStyle is the root of a separate tree.
Element* rootElement = mDocument->GetRootElement();
if (rootElement) {
nsIFrame* rootElementFrame = rootElement->GetPrimaryFrame();
if (rootElementFrame) {
rootElementFrame->Style()->List(out, aIndent);
}
}
}
void
PresShell::ListStyleSheets(FILE *out, int32_t aIndent)
{
int32_t sheetCount = mStyleSet->SheetCount(SheetType::Doc);
for (int32_t i = 0; i < sheetCount; ++i) {
mStyleSet->StyleSheetAt(SheetType::Doc, i)->List(out, aIndent);
fputs("\n", out);
}
}
#endif
//=============================================================
//=============================================================
//-- Debug Reflow Counts
//=============================================================
//=============================================================
#ifdef MOZ_REFLOW_PERF
//-------------------------------------------------------------
void
PresShell::DumpReflows()
{
if (mReflowCountMgr) {
nsAutoCString uriStr;
if (mDocument) {
nsIURI *uri = mDocument->GetDocumentURI();
if (uri) {
uri->GetPathQueryRef(uriStr);
}
}
mReflowCountMgr->DisplayTotals(uriStr.get());
mReflowCountMgr->DisplayHTMLTotals(uriStr.get());
mReflowCountMgr->DisplayDiffsInTotals();
}
}
//-------------------------------------------------------------
void
PresShell::CountReflows(const char * aName, nsIFrame * aFrame)
{
if (mReflowCountMgr) {
mReflowCountMgr->Add(aName, aFrame);
}
}
//-------------------------------------------------------------
void
PresShell::PaintCount(const char * aName,
gfxContext* aRenderingContext,
nsPresContext* aPresContext,
nsIFrame * aFrame,
const nsPoint& aOffset,
uint32_t aColor)
{
if (mReflowCountMgr) {
mReflowCountMgr->PaintCount(aName, aRenderingContext, aPresContext,
aFrame, aOffset, aColor);
}
}
//-------------------------------------------------------------
void
PresShell::SetPaintFrameCount(bool aPaintFrameCounts)
{
if (mReflowCountMgr) {
mReflowCountMgr->SetPaintFrameCounts(aPaintFrameCounts);
}
}
bool
PresShell::IsPaintingFrameCounts()
{
if (mReflowCountMgr)
return mReflowCountMgr->IsPaintingFrameCounts();
return false;
}
//------------------------------------------------------------------
//-- Reflow Counter Classes Impls
//------------------------------------------------------------------
//------------------------------------------------------------------
ReflowCounter::ReflowCounter(ReflowCountMgr * aMgr) :
mMgr(aMgr)
{
ClearTotals();
SetTotalsCache();
}
//------------------------------------------------------------------
ReflowCounter::~ReflowCounter()
{
}
//------------------------------------------------------------------
void ReflowCounter::ClearTotals()
{
mTotal = 0;
}
//------------------------------------------------------------------
void ReflowCounter::SetTotalsCache()
{
mCacheTotal = mTotal;
}
//------------------------------------------------------------------
void ReflowCounter::CalcDiffInTotals()
{
mCacheTotal = mTotal - mCacheTotal;
}
//------------------------------------------------------------------
void ReflowCounter::DisplayTotals(const char * aStr)
{
DisplayTotals(mTotal, aStr?aStr:"Totals");
}
//------------------------------------------------------------------
void ReflowCounter::DisplayDiffTotals(const char * aStr)
{
DisplayTotals(mCacheTotal, aStr?aStr:"Diff Totals");
}
//------------------------------------------------------------------
void ReflowCounter::DisplayHTMLTotals(const char * aStr)
{
DisplayHTMLTotals(mTotal, aStr?aStr:"Totals");
}
//------------------------------------------------------------------
void ReflowCounter::DisplayTotals(uint32_t aTotal, const char * aTitle)
{
// figure total
if (aTotal == 0) {
return;
}
ReflowCounter * gTots = (ReflowCounter *)mMgr->LookUp(kGrandTotalsStr);
printf("%25s\t", aTitle);
printf("%d\t", aTotal);
if (gTots != this && aTotal > 0) {
gTots->Add(aTotal);
}
}
//------------------------------------------------------------------
void ReflowCounter::DisplayHTMLTotals(uint32_t aTotal, const char * aTitle)
{
if (aTotal == 0) {
return;
}
ReflowCounter * gTots = (ReflowCounter *)mMgr->LookUp(kGrandTotalsStr);
FILE * fd = mMgr->GetOutFile();
if (!fd) {
return;
}
fprintf(fd, "<tr><td><center>%s</center></td>", aTitle);
fprintf(fd, "<td><center>%d</center></td></tr>\n", aTotal);
if (gTots != this && aTotal > 0) {
gTots->Add(aTotal);
}
}
//------------------------------------------------------------------
//-- ReflowCountMgr
//------------------------------------------------------------------
#define KEY_BUF_SIZE_FOR_PTR 24 // adequate char[] buffer to sprintf a pointer
ReflowCountMgr::ReflowCountMgr()
: mCounts(10)
, mIndiFrameCounts(10)
{
mCycledOnce = false;
mDumpFrameCounts = false;
mDumpFrameByFrameCounts = false;
mPaintFrameByFrameCounts = false;
}
//------------------------------------------------------------------
ReflowCountMgr::~ReflowCountMgr()
{
}
//------------------------------------------------------------------
ReflowCounter * ReflowCountMgr::LookUp(const char * aName)
{
return mCounts.Get(aName);
}
//------------------------------------------------------------------
void ReflowCountMgr::Add(const char * aName, nsIFrame * aFrame)
{
NS_ASSERTION(aName != nullptr, "Name shouldn't be null!");
if (mDumpFrameCounts) {
ReflowCounter * counter = mCounts.LookupForAdd(aName).OrInsert([this]() {
return new ReflowCounter(this);
});
counter->Add();
}
if ((mDumpFrameByFrameCounts || mPaintFrameByFrameCounts) &&
aFrame != nullptr) {
char key[KEY_BUF_SIZE_FOR_PTR];
SprintfLiteral(key, "%p", (void*)aFrame);
IndiReflowCounter * counter =
mIndiFrameCounts.LookupForAdd(key).OrInsert([&aName, &aFrame, this]() {
auto counter = new IndiReflowCounter(this);
counter->mFrame = aFrame;
counter->mName.AssignASCII(aName);
return counter;
});
// this eliminates extra counts from super classes
if (counter != nullptr && counter->mName.EqualsASCII(aName)) {
counter->mCount++;
counter->mCounter.Add(1);
}
}
}
//------------------------------------------------------------------
void ReflowCountMgr::PaintCount(const char* aName,
gfxContext* aRenderingContext,
nsPresContext* aPresContext,
nsIFrame* aFrame,
const nsPoint& aOffset,
uint32_t aColor)
{
if (mPaintFrameByFrameCounts &&
aFrame != nullptr) {
char key[KEY_BUF_SIZE_FOR_PTR];
SprintfLiteral(key, "%p", (void*)aFrame);
IndiReflowCounter * counter = mIndiFrameCounts.Get(key);
if (counter != nullptr && counter->mName.EqualsASCII(aName)) {
DrawTarget* drawTarget = aRenderingContext->GetDrawTarget();
int32_t appUnitsPerDevPixel = aPresContext->AppUnitsPerDevPixel();
aRenderingContext->Save();
gfxPoint devPixelOffset =
nsLayoutUtils::PointToGfxPoint(aOffset, appUnitsPerDevPixel);
aRenderingContext->SetMatrixDouble(
aRenderingContext->CurrentMatrixDouble().PreTranslate(devPixelOffset));
// We don't care about the document language or user fonts here;
// just get a default Latin font.
nsFont font(eFamily_serif, nsPresContext::CSSPixelsToAppUnits(11));
nsFontMetrics::Params params;
params.language = nsGkAtoms::x_western;
params.textPerf = aPresContext->GetTextPerfMetrics();
RefPtr<nsFontMetrics> fm =
aPresContext->DeviceContext()->GetMetricsFor(font, params);
char buf[16];
int len = SprintfLiteral(buf, "%d", counter->mCount);
nscoord x = 0, y = fm->MaxAscent();
nscoord width, height = fm->MaxHeight();
fm->SetTextRunRTL(false);
width = fm->GetWidth(buf, len, drawTarget);
Color color;
Color color2;
if (aColor != 0) {
color = Color::FromABGR(aColor);
color2 = Color(0.f, 0.f, 0.f);
} else {
gfx::Float rc = 0.f, gc = 0.f, bc = 0.f;
if (counter->mCount < 5) {
rc = 1.f;
gc = 1.f;
} else if (counter->mCount < 11) {
gc = 1.f;
} else {
rc = 1.f;
}
color = Color(rc, gc, bc);
color2 = Color(rc/2, gc/2, bc/2);
}
nsRect rect(0,0, width+15, height+15);
Rect devPxRect =
NSRectToSnappedRect(rect, appUnitsPerDevPixel, *drawTarget);
ColorPattern black(ToDeviceColor(Color(0.f, 0.f, 0.f, 1.f)));
drawTarget->FillRect(devPxRect, black);
aRenderingContext->SetColor(color2);
fm->DrawString(buf, len, x+15, y+15, aRenderingContext);
aRenderingContext->SetColor(color);
fm->DrawString(buf, len, x, y, aRenderingContext);
aRenderingContext->Restore();
}
}
}
//------------------------------------------------------------------
void ReflowCountMgr::DoGrandTotals()
{
auto entry = mCounts.LookupForAdd(kGrandTotalsStr);
if (!entry) {
entry.OrInsert([this]() { return new ReflowCounter(this); });
} else {
entry.Data()->ClearTotals();
}
printf("\t\t\t\tTotal\n");
for (uint32_t i=0;i<78;i++) {
printf("-");
}
printf("\n");
for (auto iter = mCounts.Iter(); !iter.Done(); iter.Next()) {
iter.Data()->DisplayTotals(iter.Key());
}
}
static void RecurseIndiTotals(nsPresContext* aPresContext,
nsClassHashtable<nsCharPtrHashKey,
IndiReflowCounter>& aHT,
nsIFrame * aParentFrame,
int32_t aLevel)
{
if (aParentFrame == nullptr) {
return;
}
char key[KEY_BUF_SIZE_FOR_PTR];
SprintfLiteral(key, "%p", (void*)aParentFrame);
IndiReflowCounter * counter = aHT.Get(key);
if (counter) {
counter->mHasBeenOutput = true;
char * name = ToNewCString(counter->mName);
for (int32_t i=0;i<aLevel;i++) printf(" ");
printf("%s - %p [%d][", name, (void*)aParentFrame, counter->mCount);
printf("%d", counter->mCounter.GetTotal());
printf("]\n");
free(name);
}
for (nsIFrame* child : aParentFrame->PrincipalChildList()) {
RecurseIndiTotals(aPresContext, aHT, child, aLevel+1);
}
}
//------------------------------------------------------------------
void ReflowCountMgr::DoIndiTotalsTree()
{
printf("\n------------------------------------------------\n");
printf("-- Individual Frame Counts\n");
printf("------------------------------------------------\n");
if (mPresShell) {
nsIFrame* rootFrame = mPresShell->GetRootFrame();
RecurseIndiTotals(mPresContext, mIndiFrameCounts, rootFrame, 0);
printf("------------------------------------------------\n");
printf("-- Individual Counts of Frames not in Root Tree\n");
printf("------------------------------------------------\n");
for (auto iter = mIndiFrameCounts.Iter(); !iter.Done(); iter.Next()) {
IndiReflowCounter* counter = iter.Data();
if (!counter->mHasBeenOutput) {
char * name = ToNewCString(counter->mName);
printf("%s - %p [%d][", name, (void*)counter->mFrame, counter->mCount);
printf("%d", counter->mCounter.GetTotal());
printf("]\n");
free(name);
}
}
}
}
//------------------------------------------------------------------
void ReflowCountMgr::DoGrandHTMLTotals()
{
auto entry = mCounts.LookupForAdd(kGrandTotalsStr);
if (!entry) {
entry.OrInsert([this]() { return new ReflowCounter(this); });
} else {
entry.Data()->ClearTotals();
}
static const char * title[] = {"Class", "Reflows"};
fprintf(mFD, "<tr>");
for (uint32_t i=0; i < ArrayLength(title); i++) {
fprintf(mFD, "<td><center><b>%s<b></center></td>", title[i]);
}
fprintf(mFD, "</tr>\n");
for (auto iter = mCounts.Iter(); !iter.Done(); iter.Next()) {
iter.Data()->DisplayHTMLTotals(iter.Key());
}
}
//------------------------------------
void ReflowCountMgr::DisplayTotals(const char * aStr)
{
#ifdef DEBUG_rods
printf("%s\n", aStr?aStr:"No name");
#endif
if (mDumpFrameCounts) {
DoGrandTotals();
}
if (mDumpFrameByFrameCounts) {
DoIndiTotalsTree();
}
}
//------------------------------------
void ReflowCountMgr::DisplayHTMLTotals(const char * aStr)
{
#ifdef WIN32x // XXX NOT XP!
char name[1024];
char * sptr = strrchr(aStr, '/');
if (sptr) {
sptr++;
strcpy(name, sptr);
char * eptr = strrchr(name, '.');
if (eptr) {
*eptr = 0;
}
strcat(name, "_stats.html");
}
mFD = fopen(name, "w");
if (mFD) {
fprintf(mFD, "<html><head><title>Reflow Stats</title></head><body>\n");
const char * title = aStr?aStr:"No name";
fprintf(mFD, "<center><b>%s</b><br><table border=1 style=\"background-color:#e0e0e0\">", title);
DoGrandHTMLTotals();
fprintf(mFD, "</center></table>\n");
fprintf(mFD, "</body></html>\n");
fclose(mFD);
mFD = nullptr;
}
#endif // not XP!
}
//------------------------------------------------------------------
void ReflowCountMgr::ClearTotals()
{
for (auto iter = mCounts.Iter(); !iter.Done(); iter.Next()) {
iter.Data()->ClearTotals();
}
}
//------------------------------------------------------------------
void ReflowCountMgr::ClearGrandTotals()
{
auto entry = mCounts.LookupForAdd(kGrandTotalsStr);
if (!entry) {
entry.OrInsert([this]() { return new ReflowCounter(this); });
} else {
entry.Data()->ClearTotals();
entry.Data()->SetTotalsCache();
}
}
//------------------------------------------------------------------
void ReflowCountMgr::DisplayDiffsInTotals()
{
if (mCycledOnce) {
printf("Differences\n");
for (int32_t i=0;i<78;i++) {
printf("-");
}
printf("\n");
ClearGrandTotals();
}
for (auto iter = mCounts.Iter(); !iter.Done(); iter.Next()) {
if (mCycledOnce) {
iter.Data()->CalcDiffInTotals();
iter.Data()->DisplayDiffTotals(iter.Key());
}
iter.Data()->SetTotalsCache();
}
mCycledOnce = true;
}
#endif // MOZ_REFLOW_PERF
nsIFrame* nsIPresShell::GetAbsoluteContainingBlock(nsIFrame *aFrame)
{
return FrameConstructor()->GetAbsoluteContainingBlock(aFrame,
nsCSSFrameConstructor::ABS_POS);
}
#ifdef ACCESSIBILITY
bool
nsIPresShell::IsAccessibilityActive()
{
return GetAccService() != nullptr;
}
nsAccessibilityService*
nsIPresShell::AccService()
{
return GetAccService();
}
#endif
// Asks our docshell whether we're active.
void PresShell::QueryIsActive()
{
nsCOMPtr<nsISupports> container = mPresContext->GetContainerWeak();
if (mDocument) {
nsIDocument* displayDoc = mDocument->GetDisplayDocument();
if (displayDoc) {
// Ok, we're an external resource document -- we need to use our display
// document's docshell to determine "IsActive" status, since we lack
// a container.
MOZ_ASSERT(!container,
"external resource doc shouldn't have its own container");
nsPresContext* displayPresContext = displayDoc->GetPresContext();
if (displayPresContext) {
container = displayPresContext->GetContainerWeak();
}
}
}
nsCOMPtr<nsIDocShell> docshell(do_QueryInterface(container));
if (docshell) {
bool isActive;
nsresult rv = docshell->GetIsActive(&isActive);
// Even though in theory the docshell here could be "Inactive and
// Foreground", thus implying aIsHidden=false for SetIsActive(),
// this is a newly created PresShell so we'd like to invalidate anyway
// upon being made active to ensure that the contents get painted.
if (NS_SUCCEEDED(rv))
SetIsActive(isActive);
}
}
// Helper for propagating mIsActive changes to external resources
static bool
SetExternalResourceIsActive(nsIDocument* aDocument, void* aClosure)
{
nsIPresShell* shell = aDocument->GetShell();
if (shell) {
shell->SetIsActive(*static_cast<bool*>(aClosure));
}
return true;
}
static void
SetPluginIsActive(nsISupports* aSupports, void* aClosure)
{
nsCOMPtr<nsIContent> content(do_QueryInterface(aSupports));
if (!content) {
return;
}
nsIFrame *frame = content->GetPrimaryFrame();
nsIObjectFrame *objectFrame = do_QueryFrame(frame);
if (objectFrame) {
objectFrame->SetIsDocumentActive(*static_cast<bool*>(aClosure));
}
}
nsresult
PresShell::SetIsActive(bool aIsActive)
{
MOZ_ASSERT(mDocument, "should only be called with a document");
mIsActive = aIsActive;
nsPresContext* presContext = GetPresContext();
if (presContext &&
presContext->RefreshDriver()->GetPresContext() == presContext) {
presContext->RefreshDriver()->SetThrottled(!mIsActive);
}
// Propagate state-change to my resource documents' PresShells
mDocument->EnumerateExternalResources(SetExternalResourceIsActive,
&aIsActive);
mDocument->EnumerateActivityObservers(SetPluginIsActive,
&aIsActive);
nsresult rv = UpdateImageLockingState();
#ifdef ACCESSIBILITY
if (aIsActive) {
nsAccessibilityService* accService = AccService();
if (accService) {
accService->PresShellActivated(this);
}
}
#endif
return rv;
}
/*
* Determines the current image locking state. Called when one of the
* dependent factors changes.
*/
nsresult
PresShell::UpdateImageLockingState()
{
// We're locked if we're both thawed and active.
bool locked = !mFrozen && mIsActive;
nsresult rv = mDocument->ImageTracker()->SetLockingState(locked);
if (locked) {
// Request decodes for visible image frames; we want to start decoding as
// quickly as possible when we get foregrounded to minimize flashing.
for (auto iter = mApproximatelyVisibleFrames.Iter(); !iter.Done(); iter.Next()) {
nsImageFrame* imageFrame = do_QueryFrame(iter.Get()->GetKey());
if (imageFrame) {
imageFrame->MaybeDecodeForPredictedSize();
}
}
}
return rv;
}
PresShell*
PresShell::GetRootPresShell()
{
if (mPresContext) {
nsPresContext* rootPresContext = mPresContext->GetRootPresContext();
if (rootPresContext) {
return static_cast<PresShell*>(rootPresContext->PresShell());
}
}
return nullptr;
}
void
PresShell::AddSizeOfIncludingThis(nsWindowSizes& aSizes) const
{
MallocSizeOf mallocSizeOf = aSizes.mState.mMallocSizeOf;
mFrameArena.AddSizeOfExcludingThis(aSizes);
aSizes.mLayoutPresShellSize += mallocSizeOf(this);
if (mCaret) {
aSizes.mLayoutPresShellSize += mCaret->SizeOfIncludingThis(mallocSizeOf);
}
aSizes.mLayoutPresShellSize +=
mApproximatelyVisibleFrames.ShallowSizeOfExcludingThis(mallocSizeOf) +
mFramesToDirty.ShallowSizeOfExcludingThis(mallocSizeOf);
StyleSet()->AddSizeOfIncludingThis(aSizes);
aSizes.mLayoutTextRunsSize += SizeOfTextRuns(mallocSizeOf);
aSizes.mLayoutPresContextSize +=
mPresContext->SizeOfIncludingThis(mallocSizeOf);
mFrameConstructor->AddSizeOfIncludingThis(aSizes);
}
size_t
PresShell::SizeOfTextRuns(MallocSizeOf aMallocSizeOf) const
{
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (!rootFrame) {
return 0;
}
// clear the TEXT_RUN_MEMORY_ACCOUNTED flags
nsLayoutUtils::SizeOfTextRunsForFrames(rootFrame, nullptr,
/* clear = */true);
// collect the total memory in use for textruns
return nsLayoutUtils::SizeOfTextRunsForFrames(rootFrame, aMallocSizeOf,
/* clear = */false);
}
void
nsIPresShell::MarkFixedFramesForReflow(IntrinsicDirty aIntrinsicDirty)
{
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (rootFrame) {
const nsFrameList& childList = rootFrame->GetChildList(nsIFrame::kFixedList);
for (nsIFrame* childFrame : childList) {
FrameNeedsReflow(childFrame, aIntrinsicDirty, NS_FRAME_IS_DIRTY);
}
}
}
void
nsIPresShell::SetVisualViewportSize(nscoord aWidth, nscoord aHeight)
{
if (!mVisualViewportSizeSet ||
mVisualViewportSize.width != aWidth ||
mVisualViewportSize.height != aHeight) {
mVisualViewportSizeSet = true;
mVisualViewportSize.width = aWidth;
mVisualViewportSize.height = aHeight;
if (nsIScrollableFrame* rootScrollFrame = GetRootScrollFrameAsScrollable()) {
rootScrollFrame->MarkScrollbarsDirtyForReflow();
}
MarkFixedFramesForReflow(nsIPresShell::eResize);
}
}
void
nsIPresShell::RecomputeFontSizeInflationEnabled()
{
mFontSizeInflationEnabled = DetermineFontSizeInflationState();
float fontScale = nsLayoutUtils::SystemFontScale();
if (fontScale == 0.0f) {
return;
}
MOZ_ASSERT(mDocument);
MOZ_ASSERT(mPresContext);
if (mFontSizeInflationEnabled || mDocument->IsSyntheticDocument()) {
mPresContext->SetSystemFontScale(1.0f);
} else {
mPresContext->SetSystemFontScale(fontScale);
}
}
bool
nsIPresShell::DetermineFontSizeInflationState()
{
MOZ_ASSERT(mPresContext, "our pres context should not be null");
if (mPresContext->IsChrome()) {
return false;
}
if (FontSizeInflationEmPerLine() == 0 && FontSizeInflationMinTwips() == 0) {
return false;
}
// Force-enabling font inflation always trumps the heuristics here.
if (!FontSizeInflationForceEnabled()) {
if (TabChild* tab = TabChild::GetFrom(this)) {
// We're in a child process. Cancel inflation if we're not
// async-pan zoomed.
if (!tab->AsyncPanZoomEnabled()) {
return false;
}
} else if (XRE_IsParentProcess()) {
// We're in the master process. Cancel inflation if it's been
// explicitly disabled.
if (FontSizeInflationDisabledInMasterProcess()) {
return false;
}
}
}
// XXXjwir3:
// See bug 706918, comment 23 for more information on this particular section
// of the code. We're using "screen size" in place of the size of the content
// area, because on mobile, these are close or equal. This will work for our
// purposes (bug 706198), but it will need to be changed in the future to be
// more correct when we bring the rest of the viewport code into platform.
// We actually want the size of the content area, in the event that we don't
// have any metadata about the width and/or height. On mobile, the screen size
// and the size of the content area are very close, or the same value.
// In XUL fennec, the content area is the size of the <browser> widget, but
// in native fennec, the content area is the size of the Gecko LayerView
// object.
// TODO:
// Once bug 716575 has been resolved, this code should be changed so that it
// does the right thing on all platforms.
nsresult rv;
nsCOMPtr<nsIScreenManager> screenMgr =
do_GetService("@mozilla.org/gfx/screenmanager;1", &rv);
if (!NS_SUCCEEDED(rv)) {
return false;
}
nsCOMPtr<nsIScreen> screen;
screenMgr->GetPrimaryScreen(getter_AddRefs(screen));
if (screen) {
int32_t screenLeft, screenTop, screenWidth, screenHeight;
screen->GetRect(&screenLeft, &screenTop, &screenWidth, &screenHeight);
nsViewportInfo vInf =
GetDocument()->GetViewportInfo(ScreenIntSize(screenWidth, screenHeight));
if (vInf.GetDefaultZoom() >= CSSToScreenScale(1.0f) || vInf.IsAutoSizeEnabled()) {
return false;
}
}
return true;
}
void
PresShell::PausePainting()
{
if (GetPresContext()->RefreshDriver()->GetPresContext() != GetPresContext())
return;
mPaintingIsFrozen = true;
GetPresContext()->RefreshDriver()->Freeze();
}
void
PresShell::ResumePainting()
{
if (GetPresContext()->RefreshDriver()->GetPresContext() != GetPresContext())
return;
mPaintingIsFrozen = false;
GetPresContext()->RefreshDriver()->Thaw();
}
void
nsIPresShell::SyncWindowProperties(nsView* aView)
{
nsIFrame* frame = aView->GetFrame();
if (frame && mPresContext) {
// CreateReferenceRenderingContext can return nullptr
RefPtr<gfxContext> rcx(CreateReferenceRenderingContext());
nsContainerFrame::SyncWindowProperties(mPresContext, frame, aView, rcx, 0);
}
}
static SheetType
ToSheetType(uint32_t aServiceSheetType)
{
switch (aServiceSheetType) {
case nsIStyleSheetService::AGENT_SHEET:
return SheetType::Agent;
break;
case nsIStyleSheetService::USER_SHEET:
return SheetType::User;
break;
default:
MOZ_FALLTHROUGH_ASSERT("unexpected aSheetType value");
case nsIStyleSheetService::AUTHOR_SHEET:
return SheetType::Doc;
}
}
nsresult
nsIPresShell::HasRuleProcessorUsedByMultipleStyleSets(uint32_t aSheetType,
bool* aRetVal)
{
*aRetVal = false;
return NS_OK;
}
void
PresShell::NotifyStyleSheetServiceSheetAdded(StyleSheet* aSheet,
uint32_t aSheetType)
{
if (!mStyleSet) {
return;
}
switch (aSheetType) {
case nsIStyleSheetService::AGENT_SHEET:
AddAgentSheet(aSheet);
break;
case nsIStyleSheetService::USER_SHEET:
AddUserSheet(aSheet);
break;
case nsIStyleSheetService::AUTHOR_SHEET:
AddAuthorSheet(aSheet);
break;
default:
MOZ_ASSERT_UNREACHABLE("unexpected aSheetType value");
break;
}
}
void
PresShell::NotifyStyleSheetServiceSheetRemoved(StyleSheet* aSheet,
uint32_t aSheetType)
{
if (!mStyleSet) {
return;
}
RemoveSheet(ToSheetType(aSheetType), aSheet);
}
nsIContent*
PresShell::GetOverrideClickTarget(WidgetGUIEvent* aEvent,
nsIFrame* aFrame)
{
if (aEvent->mMessage != eMouseUp) {
return nullptr;
}
MOZ_ASSERT(aEvent->mClass == eMouseEventClass);
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
uint32_t flags = 0;
nsPoint eventPoint =
nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent, aFrame);
if (mouseEvent->mIgnoreRootScrollFrame) {
flags |= INPUT_IGNORE_ROOT_SCROLL_FRAME;
}
nsIFrame* target =
FindFrameTargetedByInputEvent(aEvent, aFrame, eventPoint, flags);
if (!target) {
return nullptr;
}
nsIContent* overrideClickTarget = target->GetContent();
while (overrideClickTarget && !overrideClickTarget->IsElement()) {
overrideClickTarget = overrideClickTarget->GetFlattenedTreeParent();
}
return overrideClickTarget;
}
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