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gecko-dev/layout/base/PresShell.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=2 sw=2 et tw=78:
* 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/.
*
* This Original Code has been modified by IBM Corporation.
* Modifications made by IBM described herein are
* Copyright (c) International Business Machines
* Corporation, 2000
*
* Modifications to Mozilla code or documentation
* identified per MPL Section 3.3
*
* Date Modified by Description of modification
* 05/03/2000 IBM Corp. Observer events for reflow states
*/
/* a presentation of a document, part 2 */
#ifndef mozilla_PresShell_h
#define mozilla_PresShell_h
#include "MobileViewportManager.h"
#include "mozilla/Attributes.h"
#include "mozilla/EventForwards.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/StyleSetHandle.h"
#include "mozilla/UniquePtr.h"
#include "nsAutoPtr.h"
#include "nsContentUtils.h" // For AddScriptBlocker().
#include "nsCRT.h"
#include "nsIObserver.h"
#include "nsIPresShell.h"
#include "nsISelectionController.h"
#include "nsIWidget.h"
#include "nsPresContext.h"
#include "nsRefreshDriver.h"
#include "nsStubDocumentObserver.h"
#include "nsThreadUtils.h"
#include "nsWeakReference.h"
#include "TouchManager.h"
#include "ZoomConstraintsClient.h"
class nsIDocShell;
class nsRange;
struct RangePaintInfo;
struct nsCallbackEventRequest;
#ifdef MOZ_REFLOW_PERF
class ReflowCountMgr;
#endif
class nsPresShellEventCB;
class nsAutoCauseReflowNotifier;
namespace mozilla {
class EventDispatchingCallback;
// A set type for tracking visible frames, for use by the visibility code in
// PresShell. The set contains nsIFrame* pointers.
typedef nsTHashtable<nsPtrHashKey<nsIFrame>> VisibleFrames;
// A hash table type for tracking visible regions, for use by the visibility
// code in PresShell. The mapping is from view IDs to regions in the
// coordinate system of that view's scrolled frame.
typedef nsClassHashtable<nsUint64HashKey, mozilla::CSSIntRegion> VisibleRegions;
// This is actually pref-controlled, but we use this value if we fail
// to get the pref for any reason.
#ifdef MOZ_WIDGET_ANDROID
#define PAINTLOCK_EVENT_DELAY 250
#else
#define PAINTLOCK_EVENT_DELAY 5
#endif
class PresShell final : public nsIPresShell,
public nsStubDocumentObserver,
public nsISelectionController,
public nsIObserver,
public nsSupportsWeakReference
{
public:
PresShell();
// nsISupports
NS_DECL_ISUPPORTS
static bool AccessibleCaretEnabled(nsIDocShell* aDocShell);
void Init(nsIDocument* aDocument, nsPresContext* aPresContext,
nsViewManager* aViewManager, mozilla::StyleSetHandle aStyleSet);
virtual void Destroy() override;
virtual void UpdatePreferenceStyles() override;
NS_IMETHOD GetSelection(RawSelectionType aRawSelectionType,
nsISelection** aSelection) override;
virtual mozilla::dom::Selection*
GetCurrentSelection(SelectionType aSelectionType) override;
virtual already_AddRefed<nsISelectionController>
GetSelectionControllerForFocusedContent(
nsIContent** aFocusedContent = nullptr) override;
NS_IMETHOD SetDisplaySelection(int16_t aToggle) override;
NS_IMETHOD GetDisplaySelection(int16_t *aToggle) override;
NS_IMETHOD ScrollSelectionIntoView(RawSelectionType aRawSelectionType,
SelectionRegion aRegion,
int16_t aFlags) override;
NS_IMETHOD RepaintSelection(RawSelectionType aRawSelectionType) override;
virtual void BeginObservingDocument() override;
virtual void EndObservingDocument() override;
virtual nsresult Initialize(nscoord aWidth, nscoord aHeight) override;
virtual nsresult ResizeReflow(nscoord aWidth, nscoord aHeight, nscoord aOldWidth = 0, nscoord aOldHeight = 0) override;
virtual nsresult ResizeReflowIgnoreOverride(nscoord aWidth, nscoord aHeight, nscoord aOldWidth, nscoord aOldHeight) override;
virtual nsIPageSequenceFrame* GetPageSequenceFrame() const override;
virtual nsCanvasFrame* GetCanvasFrame() const override;
virtual nsIFrame* GetPlaceholderFrameFor(nsIFrame* aFrame) const override;
virtual void FrameNeedsReflow(nsIFrame *aFrame, IntrinsicDirty aIntrinsicDirty,
nsFrameState aBitToAdd,
ReflowRootHandling aRootHandling =
eInferFromBitToAdd) override;
virtual void FrameNeedsToContinueReflow(nsIFrame *aFrame) override;
virtual void CancelAllPendingReflows() override;
virtual bool IsSafeToFlush() const override;
virtual void DoFlushPendingNotifications(mozilla::FlushType aType) override;
virtual void DoFlushPendingNotifications(mozilla::ChangesToFlush aType) override;
virtual void DestroyFramesFor(nsIContent* aContent,
nsIContent** aDestroyedFramesFor) override;
virtual void CreateFramesFor(nsIContent* aContent) override;
/**
* Recreates the frames for a node
*/
virtual nsresult RecreateFramesFor(nsIContent* aContent) override;
/**
* Post a callback that should be handled after reflow has finished.
*/
virtual nsresult PostReflowCallback(nsIReflowCallback* aCallback) override;
virtual void CancelReflowCallback(nsIReflowCallback* aCallback) override;
virtual void ClearFrameRefs(nsIFrame* aFrame) override;
virtual already_AddRefed<gfxContext> CreateReferenceRenderingContext() override;
virtual nsresult GoToAnchor(const nsAString& aAnchorName, bool aScroll,
uint32_t aAdditionalScrollFlags = 0) override;
virtual nsresult ScrollToAnchor() override;
virtual nsresult ScrollContentIntoView(nsIContent* aContent,
ScrollAxis aVertical,
ScrollAxis aHorizontal,
uint32_t aFlags) override;
virtual bool ScrollFrameRectIntoView(nsIFrame* aFrame,
const nsRect& aRect,
ScrollAxis aVertical,
ScrollAxis aHorizontal,
uint32_t aFlags) override;
virtual nsRectVisibility GetRectVisibility(nsIFrame *aFrame,
const nsRect &aRect,
nscoord aMinTwips) const override;
virtual void SetIgnoreFrameDestruction(bool aIgnore) override;
virtual void NotifyDestroyingFrame(nsIFrame* aFrame) override;
virtual nsresult CaptureHistoryState(nsILayoutHistoryState** aLayoutHistoryState) override;
virtual void UnsuppressPainting() override;
virtual nsresult GetAgentStyleSheets(
nsTArray<RefPtr<mozilla::StyleSheet>>& aSheets) override;
virtual nsresult SetAgentStyleSheets(
const nsTArray<RefPtr<mozilla::StyleSheet>>& aSheets) override;
virtual nsresult AddOverrideStyleSheet(mozilla::StyleSheet* aSheet) override;
virtual nsresult RemoveOverrideStyleSheet(mozilla::StyleSheet* aSheet) override;
virtual nsresult HandleEventWithTarget(
mozilla::WidgetEvent* aEvent,
nsIFrame* aFrame,
nsIContent* aContent,
nsEventStatus* aStatus) override;
virtual nsIFrame* GetEventTargetFrame() override;
virtual already_AddRefed<nsIContent> GetEventTargetContent(
mozilla::WidgetEvent* aEvent) override;
virtual void NotifyCounterStylesAreDirty() override;
virtual nsresult ReconstructFrames(void) override;
virtual void Freeze() override;
virtual void Thaw() override;
virtual void FireOrClearDelayedEvents(bool aFireEvents) override;
virtual nsresult RenderDocument(const nsRect& aRect, uint32_t aFlags,
nscolor aBackgroundColor,
gfxContext* aThebesContext) override;
virtual already_AddRefed<SourceSurface>
RenderNode(nsIDOMNode* aNode,
nsIntRegion* aRegion,
const mozilla::LayoutDeviceIntPoint aPoint,
mozilla::LayoutDeviceIntRect* aScreenRect,
uint32_t aFlags) override;
virtual already_AddRefed<SourceSurface>
RenderSelection(nsISelection* aSelection,
const mozilla::LayoutDeviceIntPoint aPoint,
mozilla::LayoutDeviceIntRect* aScreenRect,
uint32_t aFlags) override;
virtual already_AddRefed<nsPIDOMWindowOuter> GetRootWindow() override;
virtual LayerManager* GetLayerManager() override;
virtual bool AsyncPanZoomEnabled() override;
virtual void SetIgnoreViewportScrolling(bool aIgnore) override;
virtual nsresult SetResolution(float aResolution) override {
return SetResolutionImpl(aResolution, /* aScaleToResolution = */ false);
}
virtual nsresult SetResolutionAndScaleTo(float aResolution) override {
return SetResolutionImpl(aResolution, /* aScaleToResolution = */ true);
}
virtual bool ScaleToResolution() const override;
virtual float GetCumulativeResolution() override;
virtual float GetCumulativeNonRootScaleResolution() override;
virtual void SetRestoreResolution(float aResolution,
mozilla::LayoutDeviceIntSize aDisplaySize) override;
//nsIViewObserver interface
virtual void Paint(nsView* aViewToPaint, const nsRegion& aDirtyRegion,
uint32_t aFlags) override;
virtual nsresult HandleEvent(nsIFrame* aFrame,
mozilla::WidgetGUIEvent* aEvent,
bool aDontRetargetEvents,
nsEventStatus* aEventStatus,
nsIContent** aTargetContent) override;
virtual nsresult HandleDOMEventWithTarget(
nsIContent* aTargetContent,
mozilla::WidgetEvent* aEvent,
nsEventStatus* aStatus) override;
virtual nsresult HandleDOMEventWithTarget(nsIContent* aTargetContent,
nsIDOMEvent* aEvent,
nsEventStatus* aStatus) override;
virtual bool ShouldIgnoreInvalidation() override;
virtual void WillPaint() override;
virtual void WillPaintWindow() override;
virtual void DidPaintWindow() override;
virtual void ScheduleViewManagerFlush(PaintType aType = PAINT_DEFAULT) override;
virtual void DispatchSynthMouseMove(mozilla::WidgetGUIEvent* aEvent,
bool aFlushOnHoverChange) override;
virtual void ClearMouseCaptureOnView(nsView* aView) override;
virtual bool IsVisible() override;
virtual already_AddRefed<mozilla::AccessibleCaretEventHub> GetAccessibleCaretEventHub() const override;
// caret handling
virtual already_AddRefed<nsCaret> GetCaret() const override;
NS_IMETHOD SetCaretEnabled(bool aInEnable) override;
NS_IMETHOD SetCaretReadOnly(bool aReadOnly) override;
NS_IMETHOD GetCaretEnabled(bool *aOutEnabled) override;
NS_IMETHOD SetCaretVisibilityDuringSelection(bool aVisibility) override;
NS_IMETHOD GetCaretVisible(bool *_retval) override;
virtual void SetCaret(nsCaret *aNewCaret) override;
virtual void RestoreCaret() override;
NS_IMETHOD SetSelectionFlags(int16_t aInEnable) override;
NS_IMETHOD GetSelectionFlags(int16_t *aOutEnable) override;
// nsISelectionController
NS_IMETHOD PhysicalMove(int16_t aDirection, int16_t aAmount, bool aExtend) override;
NS_IMETHOD CharacterMove(bool aForward, bool aExtend) override;
NS_IMETHOD CharacterExtendForDelete() override;
NS_IMETHOD CharacterExtendForBackspace() override;
NS_IMETHOD WordMove(bool aForward, bool aExtend) override;
NS_IMETHOD WordExtendForDelete(bool aForward) override;
NS_IMETHOD LineMove(bool aForward, bool aExtend) override;
NS_IMETHOD IntraLineMove(bool aForward, bool aExtend) override;
NS_IMETHOD PageMove(bool aForward, bool aExtend) override;
NS_IMETHOD ScrollPage(bool aForward) override;
NS_IMETHOD ScrollLine(bool aForward) override;
NS_IMETHOD ScrollCharacter(bool aRight) override;
NS_IMETHOD CompleteScroll(bool aForward) override;
NS_IMETHOD CompleteMove(bool aForward, bool aExtend) override;
NS_IMETHOD SelectAll() override;
NS_IMETHOD CheckVisibility(nsIDOMNode *node, int16_t startOffset, int16_t EndOffset, bool *_retval) override;
virtual nsresult CheckVisibilityContent(nsIContent* aNode, int16_t aStartOffset,
int16_t aEndOffset, bool* aRetval) override;
// nsIDocumentObserver
NS_DECL_NSIDOCUMENTOBSERVER_BEGINUPDATE
NS_DECL_NSIDOCUMENTOBSERVER_ENDUPDATE
NS_DECL_NSIDOCUMENTOBSERVER_BEGINLOAD
NS_DECL_NSIDOCUMENTOBSERVER_ENDLOAD
NS_DECL_NSIDOCUMENTOBSERVER_CONTENTSTATECHANGED
NS_DECL_NSIDOCUMENTOBSERVER_DOCUMENTSTATESCHANGED
NS_DECL_NSIDOCUMENTOBSERVER_STYLESHEETADDED
NS_DECL_NSIDOCUMENTOBSERVER_STYLESHEETREMOVED
NS_DECL_NSIDOCUMENTOBSERVER_STYLESHEETAPPLICABLESTATECHANGED
NS_DECL_NSIDOCUMENTOBSERVER_STYLERULECHANGED
NS_DECL_NSIDOCUMENTOBSERVER_STYLERULEADDED
NS_DECL_NSIDOCUMENTOBSERVER_STYLERULEREMOVED
// nsIMutationObserver
NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED
NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTEWILLCHANGE
NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
NS_DECL_NSIOBSERVER
#ifdef MOZ_REFLOW_PERF
virtual void DumpReflows() override;
virtual void CountReflows(const char * aName, nsIFrame * aFrame) override;
virtual void PaintCount(const char * aName,
nsRenderingContext* aRenderingContext,
nsPresContext* aPresContext,
nsIFrame * aFrame,
const nsPoint& aOffset,
uint32_t aColor) override;
virtual void SetPaintFrameCount(bool aOn) override;
virtual bool IsPaintingFrameCounts() override;
#endif
#ifdef DEBUG
virtual void ListStyleContexts(FILE *out, int32_t aIndent = 0) override;
virtual void ListStyleSheets(FILE *out, int32_t aIndent = 0) override;
virtual void VerifyStyleTree() override;
#endif
static mozilla::LazyLogModule gLog;
virtual void DisableNonTestMouseEvents(bool aDisable) override;
virtual void UpdateCanvasBackground() override;
virtual void AddCanvasBackgroundColorItem(nsDisplayListBuilder& aBuilder,
nsDisplayList& aList,
nsIFrame* aFrame,
const nsRect& aBounds,
nscolor aBackstopColor,
uint32_t aFlags) override;
virtual void AddPrintPreviewBackgroundItem(nsDisplayListBuilder& aBuilder,
nsDisplayList& aList,
nsIFrame* aFrame,
const nsRect& aBounds) override;
virtual nscolor ComputeBackstopColor(nsView* aDisplayRoot) override;
virtual nsresult SetIsActive(bool aIsActive) override;
virtual bool GetIsViewportOverridden() override {
return (mMobileViewportManager != nullptr);
}
virtual bool IsLayoutFlushObserver() override
{
return GetPresContext()->RefreshDriver()->
IsLayoutFlushObserver(this);
}
virtual void LoadComplete() override;
void AddSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf,
nsArenaMemoryStats *aArenaObjectsSize,
size_t *aPresShellSize,
size_t *aStyleSetsSize,
size_t *aTextRunsSize,
size_t *aPresContextSize) override;
size_t SizeOfTextRuns(mozilla::MallocSizeOf aMallocSizeOf) const;
// This data is stored as a content property (nsGkAtoms::scrolling) on
// mContentToScrollTo when we have a pending ScrollIntoView.
struct ScrollIntoViewData {
ScrollAxis mContentScrollVAxis;
ScrollAxis mContentScrollHAxis;
uint32_t mContentToScrollToFlags;
};
//////////////////////////////////////////////////////////////////////////////
// Approximate frame visibility tracking public API.
//////////////////////////////////////////////////////////////////////////////
void ScheduleApproximateFrameVisibilityUpdateSoon() override;
void ScheduleApproximateFrameVisibilityUpdateNow() override;
void RebuildApproximateFrameVisibilityDisplayList(const nsDisplayList& aList) override;
void RebuildApproximateFrameVisibility(nsRect* aRect = nullptr,
bool aRemoveOnly = false) override;
void EnsureFrameInApproximatelyVisibleList(nsIFrame* aFrame) override;
void RemoveFrameFromApproximatelyVisibleList(nsIFrame* aFrame) override;
bool AssumeAllFramesVisible() override;
virtual void RecordShadowStyleChange(mozilla::dom::ShadowRoot* aShadowRoot) override;
virtual bool CanDispatchEvent(
const mozilla::WidgetGUIEvent* aEvent = nullptr) const override;
void SetNextPaintCompressed() { mNextPaintCompressed = true; }
void NotifyStyleSheetServiceSheetAdded(mozilla::StyleSheet* aSheet,
uint32_t aSheetType) override;
void NotifyStyleSheetServiceSheetRemoved(mozilla::StyleSheet* aSheet,
uint32_t aSheetType) override;
protected:
virtual ~PresShell();
void HandlePostedReflowCallbacks(bool aInterruptible);
void CancelPostedReflowCallbacks();
void ScheduleBeforeFirstPaint();
void UnsuppressAndInvalidate();
void WillCauseReflow() {
nsContentUtils::AddScriptBlocker();
++mChangeNestCount;
}
nsresult DidCauseReflow();
friend class ::nsAutoCauseReflowNotifier;
nsresult DispatchEventToDOM(mozilla::WidgetEvent* aEvent,
nsEventStatus* aStatus,
nsPresShellEventCB* aEventCB);
void DispatchTouchEventToDOM(mozilla::WidgetEvent* aEvent,
nsEventStatus* aStatus,
nsPresShellEventCB* aEventCB,
bool aTouchIsNew);
void WillDoReflow();
/**
* Callback handler for whether reflow happened.
*
* @param aInterruptible Whether or not reflow interruption is allowed.
*/
void DidDoReflow(bool aInterruptible);
// ProcessReflowCommands returns whether we processed all our dirty roots
// without interruptions.
bool ProcessReflowCommands(bool aInterruptible);
// MaybeScheduleReflow checks if posting a reflow is needed, then checks if
// the last reflow was interrupted. In the interrupted case ScheduleReflow is
// called off a timer, otherwise it is called directly.
void MaybeScheduleReflow();
// Actually schedules a reflow. This should only be called by
// MaybeScheduleReflow and the reflow timer ScheduleReflowOffTimer
// sets up.
void ScheduleReflow();
// DoReflow returns whether the reflow finished without interruption
bool DoReflow(nsIFrame* aFrame, bool aInterruptible);
#ifdef DEBUG
void DoVerifyReflow();
void VerifyHasDirtyRootAncestor(nsIFrame* aFrame);
#endif
// Helper for ScrollContentIntoView
void DoScrollContentIntoView();
/**
* Initialize cached font inflation preference values and do an initial
* computation to determine if font inflation is enabled.
*
* @see nsLayoutUtils::sFontSizeInflationEmPerLine
* @see nsLayoutUtils::sFontSizeInflationMinTwips
* @see nsLayoutUtils::sFontSizeInflationLineThreshold
*/
void SetupFontInflation();
struct RenderingState {
explicit RenderingState(PresShell* aPresShell)
: mResolution(aPresShell->mResolution)
, mRenderFlags(aPresShell->mRenderFlags)
{ }
Maybe<float> mResolution;
RenderFlags mRenderFlags;
};
struct AutoSaveRestoreRenderingState {
explicit AutoSaveRestoreRenderingState(PresShell* aPresShell)
: mPresShell(aPresShell)
, mOldState(aPresShell)
{}
~AutoSaveRestoreRenderingState()
{
mPresShell->mRenderFlags = mOldState.mRenderFlags;
mPresShell->mResolution = mOldState.mResolution;
}
PresShell* mPresShell;
RenderingState mOldState;
};
static RenderFlags ChangeFlag(RenderFlags aFlags, bool aOnOff,
eRenderFlag aFlag)
{
return aOnOff ? (aFlags | aFlag) : (aFlag & ~aFlag);
}
void SetRenderingState(const RenderingState& aState);
friend class ::nsPresShellEventCB;
bool mCaretEnabled;
#ifdef DEBUG
nsStyleSet* CloneStyleSet(nsStyleSet* aSet);
bool VerifyIncrementalReflow();
bool mInVerifyReflow;
void ShowEventTargetDebug();
#endif
void RecordStyleSheetChange(mozilla::StyleSheet* aStyleSheet);
void RemovePreferenceStyles();
// methods for painting a range to an offscreen buffer
// given a display list, clip the items within the list to
// the range
nsRect ClipListToRange(nsDisplayListBuilder *aBuilder,
nsDisplayList* aList,
nsRange* aRange);
// create a RangePaintInfo for the range aRange containing the
// display list needed to paint the range to a surface
mozilla::UniquePtr<RangePaintInfo>
CreateRangePaintInfo(nsIDOMRange* aRange,
nsRect& aSurfaceRect,
bool aForPrimarySelection);
/*
* Paint the items to a new surface and return it.
*
* aSelection - selection being painted, if any
* aRegion - clip region, if any
* aArea - area that the surface occupies, relative to the root frame
* aPoint - reference point, typically the mouse position
* aScreenRect - [out] set to the area of the screen the painted area should
* be displayed at
* aFlags - set RENDER_AUTO_SCALE to scale down large images, but it must not
* be set if a custom image was specified
*/
already_AddRefed<SourceSurface>
PaintRangePaintInfo(const nsTArray<mozilla::UniquePtr<RangePaintInfo>>& aItems,
nsISelection* aSelection,
nsIntRegion* aRegion,
nsRect aArea,
const mozilla::LayoutDeviceIntPoint aPoint,
mozilla::LayoutDeviceIntRect* aScreenRect,
uint32_t aFlags);
/**
* Methods to handle changes to user and UA sheet lists that we get
* notified about.
*/
void AddUserSheet(StyleSheet* aSheet);
void AddAgentSheet(StyleSheet* aSheet);
void AddAuthorSheet(StyleSheet* aSheet);
void RemoveSheet(mozilla::SheetType aType, StyleSheet* aSheet);
// Hide a view if it is a popup
void HideViewIfPopup(nsView* aView);
// Utility method to restore the root scrollframe state
void RestoreRootScrollPosition();
void MaybeReleaseCapturingContent();
nsresult HandleRetargetedEvent(mozilla::WidgetEvent* aEvent,
nsEventStatus* aStatus,
nsIContent* aTarget)
{
PushCurrentEventInfo(nullptr, nullptr);
mCurrentEventContent = aTarget;
nsresult rv = NS_OK;
if (GetCurrentEventFrame()) {
rv = HandleEventInternal(aEvent, aStatus, true);
}
PopCurrentEventInfo();
return rv;
}
class DelayedEvent
{
public:
virtual ~DelayedEvent() { }
virtual void Dispatch() { }
virtual bool IsKeyPressEvent() { return false; }
};
class DelayedInputEvent : public DelayedEvent
{
public:
virtual void Dispatch() override;
protected:
DelayedInputEvent();
virtual ~DelayedInputEvent();
mozilla::WidgetInputEvent* mEvent;
};
class DelayedMouseEvent : public DelayedInputEvent
{
public:
explicit DelayedMouseEvent(mozilla::WidgetMouseEvent* aEvent);
};
class DelayedKeyEvent : public DelayedInputEvent
{
public:
explicit DelayedKeyEvent(mozilla::WidgetKeyboardEvent* aEvent);
virtual bool IsKeyPressEvent() override;
};
// Check if aEvent is a mouse event and record the mouse location for later
// synth mouse moves.
void RecordMouseLocation(mozilla::WidgetGUIEvent* aEvent);
class nsSynthMouseMoveEvent final : public nsARefreshObserver {
public:
nsSynthMouseMoveEvent(PresShell* aPresShell, bool aFromScroll)
: mPresShell(aPresShell), mFromScroll(aFromScroll) {
NS_ASSERTION(mPresShell, "null parameter");
}
private:
// Private destructor, to discourage deletion outside of Release():
~nsSynthMouseMoveEvent() {
Revoke();
}
public:
NS_INLINE_DECL_REFCOUNTING(nsSynthMouseMoveEvent, override)
void Revoke() {
if (mPresShell) {
mPresShell->GetPresContext()->RefreshDriver()->
RemoveRefreshObserver(this, FlushType::Display);
mPresShell = nullptr;
}
}
virtual void WillRefresh(mozilla::TimeStamp aTime) override {
if (mPresShell) {
RefPtr<PresShell> shell = mPresShell;
shell->ProcessSynthMouseMoveEvent(mFromScroll);
}
}
private:
PresShell* mPresShell;
bool mFromScroll;
};
void ProcessSynthMouseMoveEvent(bool aFromScroll);
void QueryIsActive();
nsresult UpdateImageLockingState();
bool InZombieDocument(nsIContent *aContent);
already_AddRefed<nsIPresShell> GetParentPresShellForEventHandling();
nsIContent* GetCurrentEventContent();
nsIFrame* GetCurrentEventFrame();
nsresult RetargetEventToParent(mozilla::WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus);
void PushCurrentEventInfo(nsIFrame* aFrame, nsIContent* aContent);
void PopCurrentEventInfo();
/**
* @param aIsHandlingNativeEvent true when the caller (perhaps) handles
* an event which is caused by native
* event. Otherwise, false.
*/
nsresult HandleEventInternal(mozilla::WidgetEvent* aEvent,
nsEventStatus* aStatus,
bool aIsHandlingNativeEvent);
nsresult HandlePositionedEvent(nsIFrame* aTargetFrame,
mozilla::WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus);
// This returns the focused DOM window under our top level window.
// I.e., when we are deactive, this returns the *last* focused DOM window.
already_AddRefed<nsPIDOMWindowOuter> GetFocusedDOMWindowInOurWindow();
/*
* This and the next two helper methods are used to target and position the
* context menu when the keyboard shortcut is used to open it.
*
* If another menu is open, the context menu is opened relative to the
* active menuitem within the menu, or the menu itself if no item is active.
* Otherwise, if the caret is visible, the menu is opened near the caret.
* Otherwise, if a selectable list such as a listbox is focused, the
* current item within the menu is opened relative to this item.
* Otherwise, the context menu is opened at the topleft corner of the
* view.
*
* Returns true if the context menu event should fire and false if it should
* not.
*/
bool AdjustContextMenuKeyEvent(mozilla::WidgetMouseEvent* aEvent);
//
bool PrepareToUseCaretPosition(nsIWidget* aEventWidget,
mozilla::LayoutDeviceIntPoint& aTargetPt);
// Get the selected item and coordinates in device pixels relative to root
// document's root view for element, first ensuring the element is onscreen
void GetCurrentItemAndPositionForElement(nsIDOMElement *aCurrentEl,
nsIContent **aTargetToUse,
mozilla::LayoutDeviceIntPoint& aTargetPt,
nsIWidget *aRootWidget);
void FireResizeEvent();
static void AsyncResizeEventCallback(nsITimer* aTimer, void* aPresShell);
virtual void SynthesizeMouseMove(bool aFromScroll) override;
PresShell* GetRootPresShell();
nscolor GetDefaultBackgroundColorToDraw();
DOMHighResTimeStamp GetPerformanceNow();
// The callback for the mPaintSuppressionTimer timer.
static void sPaintSuppressionCallback(nsITimer* aTimer, void* aPresShell);
// The callback for the mReflowContinueTimer timer.
static void sReflowContinueCallback(nsITimer* aTimer, void* aPresShell);
bool ScheduleReflowOffTimer();
// Widget notificiations
virtual void WindowSizeMoveDone() override;
virtual void SysColorChanged() override { mPresContext->SysColorChanged(); }
virtual void ThemeChanged() override { mPresContext->ThemeChanged(); }
virtual void BackingScaleFactorChanged() override { mPresContext->UIResolutionChanged(); }
virtual nsIDocument* GetPrimaryContentDocument() override;
virtual void PausePainting() override;
virtual void ResumePainting() override;
void UpdateActivePointerState(mozilla::WidgetGUIEvent* aEvent);
//////////////////////////////////////////////////////////////////////////////
// Approximate frame visibility tracking implementation.
//////////////////////////////////////////////////////////////////////////////
void UpdateApproximateFrameVisibility();
void DoUpdateApproximateFrameVisibility(bool aRemoveOnly);
void ClearApproximatelyVisibleFramesList(const Maybe<mozilla::OnNonvisible>& aNonvisibleAction
= Nothing());
static void ClearApproximateFrameVisibilityVisited(nsView* aView, bool aClear);
static void MarkFramesInListApproximatelyVisible(const nsDisplayList& aList,
Maybe<VisibleRegions>& aVisibleRegions);
void MarkFramesInSubtreeApproximatelyVisible(nsIFrame* aFrame,
const nsRect& aRect,
Maybe<VisibleRegions>& aVisibleRegions,
bool aRemoveOnly = false);
void DecApproximateVisibleCount(VisibleFrames& aFrames,
const Maybe<OnNonvisible>& aNonvisibleAction = Nothing());
nsRevocableEventPtr<nsRunnableMethod<PresShell>> mUpdateApproximateFrameVisibilityEvent;
// A set of frames that were visible or could be visible soon at the time
// that we last did an approximate frame visibility update.
VisibleFrames mApproximatelyVisibleFrames;
nsresult SetResolutionImpl(float aResolution, bool aScaleToResolution);
#ifdef DEBUG
// The reflow root under which we're currently reflowing. Null when
// not in reflow.
nsIFrame* mCurrentReflowRoot;
uint32_t mUpdateCount;
#endif
#ifdef MOZ_REFLOW_PERF
ReflowCountMgr* mReflowCountMgr;
#endif
// This is used for synthetic mouse events that are sent when what is under
// the mouse pointer may have changed without the mouse moving (eg scrolling,
// change to the document contents).
// It is set only on a presshell for a root document, this value represents
// the last observed location of the mouse relative to that root document. It
// is set to (NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE) if the mouse isn't
// over our window or there is no last observed mouse location for some
// reason.
nsPoint mMouseLocation;
// This is an APZ state variable that tracks the target guid for the last
// mouse event that was processed (corresponding to mMouseLocation). This is
// needed for the synthetic mouse events.
mozilla::layers::ScrollableLayerGuid mMouseEventTargetGuid;
// mStyleSet owns it but we maintain a ref, may be null
RefPtr<mozilla::StyleSheet> mPrefStyleSheet;
// Set of frames that we should mark with NS_FRAME_HAS_DIRTY_CHILDREN after
// we finish reflowing mCurrentReflowRoot.
nsTHashtable<nsPtrHashKey<nsIFrame> > mFramesToDirty;
// Reflow roots that need to be reflowed.
nsTArray<nsIFrame*> mDirtyRoots;
nsTArray<nsAutoPtr<DelayedEvent> > mDelayedEvents;
nsRevocableEventPtr<nsRunnableMethod<PresShell> > mResizeEvent;
nsCOMPtr<nsITimer> mAsyncResizeEventTimer;
private:
nsIFrame* mCurrentEventFrame;
nsCOMPtr<nsIContent> mCurrentEventContent;
nsTArray<nsIFrame*> mCurrentEventFrameStack;
nsCOMArray<nsIContent> mCurrentEventContentStack;
protected:
nsRevocableEventPtr<nsSynthMouseMoveEvent> mSynthMouseMoveEvent;
nsCOMPtr<nsIContent> mLastAnchorScrolledTo;
RefPtr<nsCaret> mCaret;
RefPtr<nsCaret> mOriginalCaret;
nsCallbackEventRequest* mFirstCallbackEventRequest;
nsCallbackEventRequest* mLastCallbackEventRequest;
mozilla::TouchManager mTouchManager;
RefPtr<ZoomConstraintsClient> mZoomConstraintsClient;
RefPtr<MobileViewportManager> mMobileViewportManager;
RefPtr<mozilla::AccessibleCaretEventHub> mAccessibleCaretEventHub;
// This timer controls painting suppression. Until it fires
// or all frames are constructed, we won't paint anything but
// our <body> background and scrollbars.
nsCOMPtr<nsITimer> mPaintSuppressionTimer;
nsCOMPtr<nsITimer> mDelayedPaintTimer;
// The `performance.now()` value when we last started to process reflows.
DOMHighResTimeStamp mLastReflowStart;
mozilla::TimeStamp mLoadBegin; // used to time loads
// Information needed to properly handle scrolling content into view if the
// pre-scroll reflow flush can be interrupted. mContentToScrollTo is
// non-null between the initial scroll attempt and the first time we finish
// processing all our dirty roots. mContentToScrollTo has a content property
// storing the details for the scroll operation, see ScrollIntoViewData above.
nsCOMPtr<nsIContent> mContentToScrollTo;
nscoord mLastAnchorScrollPositionY;
// Information about live content (which still stay in DOM tree).
// Used in case we need re-dispatch event after sending pointer event,
// when target of pointer event was deleted during executing user handlers.
nsCOMPtr<nsIContent> mPointerEventTarget;
// This is used to protect ourselves from triggering reflow while in the
// middle of frame construction and the like... it really shouldn't be
// needed, one hopes, but it is for now.
uint16_t mChangeNestCount;
bool mDocumentLoading : 1;
bool mIgnoreFrameDestruction : 1;
bool mHaveShutDown : 1;
bool mLastRootReflowHadUnconstrainedBSize : 1;
bool mNoDelayedMouseEvents : 1;
bool mNoDelayedKeyEvents : 1;
// We've been disconnected from the document. We will refuse to paint the
// document until either our timer fires or all frames are constructed.
bool mIsDocumentGone : 1;
// Indicates that it is safe to unlock painting once all pending reflows
// have been processed.
bool mShouldUnsuppressPainting : 1;
bool mAsyncResizeTimerIsActive : 1;
bool mInResize : 1;
bool mApproximateFrameVisibilityVisited : 1;
bool mNextPaintCompressed : 1;
bool mHasCSSBackgroundColor : 1;
// Whether content should be scaled by the resolution amount. If this is
// not set, a transform that scales by the inverse of the resolution is
// applied to rendered layers.
bool mScaleToResolution : 1;
// Whether the last chrome-only escape key event is consumed.
bool mIsLastChromeOnlyEscapeKeyConsumed : 1;
// Whether the widget has received a paint message yet.
bool mHasReceivedPaintMessage : 1;
bool mIsLastKeyDownCanceled : 1;
static bool sDisableNonTestMouseEvents;
};
} // namespace mozilla
#endif // mozilla_PresShell_h
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