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gecko-dev
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gecko-dev/dom/events/EventStateManager.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/. */
#include "mozilla/Attributes.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/EventStates.h"
#include "mozilla/IMEStateManager.h"
#include "mozilla/MiscEvents.h"
#include "mozilla/MathAlgorithms.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/TextComposition.h"
#include "mozilla/TextEvents.h"
#include "mozilla/TouchEvents.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/TabParent.h"
#include "mozilla/dom/UIEvent.h"
#include "ContentEventHandler.h"
#include "IMEContentObserver.h"
#include "WheelHandlingHelper.h"
#include "nsCOMPtr.h"
#include "nsFocusManager.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsIFrame.h"
#include "nsIWidget.h"
#include "nsPresContext.h"
#include "nsIPresShell.h"
#include "nsGkAtoms.h"
#include "nsIFormControl.h"
#include "nsIComboboxControlFrame.h"
#include "nsIScrollableFrame.h"
#include "nsIDOMHTMLElement.h"
#include "nsIDOMXULControlElement.h"
#include "nsNameSpaceManager.h"
#include "nsIBaseWindow.h"
#include "nsISelection.h"
#include "nsITextControlElement.h"
#include "nsFrameSelection.h"
#include "nsPIDOMWindow.h"
#include "nsPIWindowRoot.h"
#include "nsIWebNavigation.h"
#include "nsIContentViewer.h"
#include "nsFrameManager.h"
#include "nsIDOMXULElement.h"
#include "nsIDOMKeyEvent.h"
#include "nsIObserverService.h"
#include "nsIDocShell.h"
#include "nsIDOMWheelEvent.h"
#include "nsIDOMDragEvent.h"
#include "nsIDOMUIEvent.h"
#include "nsIMozBrowserFrame.h"
#include "nsSubDocumentFrame.h"
#include "nsLayoutUtils.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsUnicharUtils.h"
#include "nsContentUtils.h"
#include "imgIContainer.h"
#include "nsIProperties.h"
#include "nsISupportsPrimitives.h"
#include "nsServiceManagerUtils.h"
#include "nsITimer.h"
#include "nsFontMetrics.h"
#include "nsIDOMXULDocument.h"
#include "nsIDragService.h"
#include "nsIDragSession.h"
#include "mozilla/dom/DataTransfer.h"
#include "nsContentAreaDragDrop.h"
#ifdef MOZ_XUL
#include "nsTreeBodyFrame.h"
#endif
#include "nsIController.h"
#include "nsICommandParams.h"
#include "mozilla/Services.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/HTMLLabelElement.h"
#include "mozilla/Preferences.h"
#include "mozilla/LookAndFeel.h"
#include "GeckoProfiler.h"
#include "Units.h"
#include "mozilla/layers/APZCTreeManager.h"
#ifdef XP_MACOSX
#import <ApplicationServices/ApplicationServices.h>
#endif
namespace mozilla {
using namespace dom;
//#define DEBUG_DOCSHELL_FOCUS
#define NS_USER_INTERACTION_INTERVAL 5000 // ms
static const LayoutDeviceIntPoint kInvalidRefPoint = LayoutDeviceIntPoint(-1,-1);
static uint32_t gMouseOrKeyboardEventCounter = 0;
static nsITimer* gUserInteractionTimer = nullptr;
static nsITimerCallback* gUserInteractionTimerCallback = nullptr;
static inline int32_t
RoundDown(double aDouble)
{
return (aDouble > 0) ? static_cast<int32_t>(floor(aDouble)) :
static_cast<int32_t>(ceil(aDouble));
}
#ifdef DEBUG_DOCSHELL_FOCUS
static void
PrintDocTree(nsIDocShellTreeItem* aParentItem, int aLevel)
{
for (int32_t i=0;i<aLevel;i++) printf(" ");
int32_t childWebshellCount;
aParentItem->GetChildCount(&childWebshellCount);
nsCOMPtr<nsIDocShell> parentAsDocShell(do_QueryInterface(aParentItem));
int32_t type = aParentItem->ItemType();
nsCOMPtr<nsIPresShell> presShell = parentAsDocShell->GetPresShell();
nsRefPtr<nsPresContext> presContext;
parentAsDocShell->GetPresContext(getter_AddRefs(presContext));
nsCOMPtr<nsIContentViewer> cv;
parentAsDocShell->GetContentViewer(getter_AddRefs(cv));
nsCOMPtr<nsIDOMDocument> domDoc;
if (cv)
cv->GetDOMDocument(getter_AddRefs(domDoc));
nsCOMPtr<nsIDocument> doc = do_QueryInterface(domDoc);
nsCOMPtr<nsIDOMWindow> domwin = doc ? doc->GetWindow() : nullptr;
nsIURI* uri = doc ? doc->GetDocumentURI() : nullptr;
printf("DS %p Type %s Cnt %d Doc %p DW %p EM %p%c",
static_cast<void*>(parentAsDocShell.get()),
type==nsIDocShellTreeItem::typeChrome?"Chrome":"Content",
childWebshellCount, static_cast<void*>(doc.get()),
static_cast<void*>(domwin.get()),
static_cast<void*>(presContext ? presContext->EventStateManager() : nullptr),
uri ? ' ' : '\n');
if (uri) {
nsAutoCString spec;
uri->GetSpec(spec);
printf("\"%s\"\n", spec.get());
}
if (childWebshellCount > 0) {
for (int32_t i = 0; i < childWebshellCount; i++) {
nsCOMPtr<nsIDocShellTreeItem> child;
aParentItem->GetChildAt(i, getter_AddRefs(child));
PrintDocTree(child, aLevel + 1);
}
}
}
static void
PrintDocTreeAll(nsIDocShellTreeItem* aItem)
{
nsCOMPtr<nsIDocShellTreeItem> item = aItem;
for(;;) {
nsCOMPtr<nsIDocShellTreeItem> parent;
item->GetParent(getter_AddRefs(parent));
if (!parent)
break;
item = parent;
}
PrintDocTree(item, 0);
}
#endif
// mask values for ui.key.chromeAccess and ui.key.contentAccess
#define NS_MODIFIER_SHIFT 1
#define NS_MODIFIER_CONTROL 2
#define NS_MODIFIER_ALT 4
#define NS_MODIFIER_META 8
#define NS_MODIFIER_OS 16
static nsIDocument *
GetDocumentFromWindow(nsIDOMWindow *aWindow)
{
nsCOMPtr<nsPIDOMWindow> win = do_QueryInterface(aWindow);
return win ? win->GetExtantDoc() : nullptr;
}
/******************************************************************/
/* mozilla::UITimerCallback */
/******************************************************************/
class UITimerCallback final : public nsITimerCallback
{
public:
UITimerCallback() : mPreviousCount(0) {}
NS_DECL_ISUPPORTS
NS_DECL_NSITIMERCALLBACK
private:
~UITimerCallback() {}
uint32_t mPreviousCount;
};
NS_IMPL_ISUPPORTS(UITimerCallback, nsITimerCallback)
// If aTimer is nullptr, this method always sends "user-interaction-inactive"
// notification.
NS_IMETHODIMP
UITimerCallback::Notify(nsITimer* aTimer)
{
nsCOMPtr<nsIObserverService> obs =
mozilla::services::GetObserverService();
if (!obs)
return NS_ERROR_FAILURE;
if ((gMouseOrKeyboardEventCounter == mPreviousCount) || !aTimer) {
gMouseOrKeyboardEventCounter = 0;
obs->NotifyObservers(nullptr, "user-interaction-inactive", nullptr);
if (gUserInteractionTimer) {
gUserInteractionTimer->Cancel();
NS_RELEASE(gUserInteractionTimer);
}
} else {
obs->NotifyObservers(nullptr, "user-interaction-active", nullptr);
EventStateManager::UpdateUserActivityTimer();
}
mPreviousCount = gMouseOrKeyboardEventCounter;
return NS_OK;
}
/******************************************************************/
/* mozilla::OverOutElementsWrapper */
/******************************************************************/
OverOutElementsWrapper::OverOutElementsWrapper()
: mLastOverFrame(nullptr)
{
}
OverOutElementsWrapper::~OverOutElementsWrapper()
{
}
NS_IMPL_CYCLE_COLLECTION(OverOutElementsWrapper,
mLastOverElement,
mFirstOverEventElement,
mFirstOutEventElement)
NS_IMPL_CYCLE_COLLECTING_ADDREF(OverOutElementsWrapper)
NS_IMPL_CYCLE_COLLECTING_RELEASE(OverOutElementsWrapper)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(OverOutElementsWrapper)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
/******************************************************************/
/* mozilla::EventStateManager */
/******************************************************************/
static uint32_t sESMInstanceCount = 0;
static bool sPointerEventEnabled = false;
int32_t EventStateManager::sUserInputEventDepth = 0;
bool EventStateManager::sNormalLMouseEventInProcess = false;
EventStateManager* EventStateManager::sActiveESM = nullptr;
nsIDocument* EventStateManager::sMouseOverDocument = nullptr;
nsWeakFrame EventStateManager::sLastDragOverFrame = nullptr;
LayoutDeviceIntPoint EventStateManager::sLastRefPoint = kInvalidRefPoint;
LayoutDeviceIntPoint EventStateManager::sLastScreenPoint = LayoutDeviceIntPoint(0, 0);
LayoutDeviceIntPoint EventStateManager::sSynthCenteringPoint = kInvalidRefPoint;
CSSIntPoint EventStateManager::sLastClientPoint = CSSIntPoint(0, 0);
bool EventStateManager::sIsPointerLocked = false;
// Reference to the pointer locked element.
nsWeakPtr EventStateManager::sPointerLockedElement;
// Reference to the document which requested pointer lock.
nsWeakPtr EventStateManager::sPointerLockedDoc;
nsCOMPtr<nsIContent> EventStateManager::sDragOverContent = nullptr;
TimeStamp EventStateManager::sHandlingInputStart;
EventStateManager::WheelPrefs*
EventStateManager::WheelPrefs::sInstance = nullptr;
EventStateManager::DeltaAccumulator*
EventStateManager::DeltaAccumulator::sInstance = nullptr;
EventStateManager::EventStateManager()
: mLockCursor(0)
, mPreLockPoint(0,0)
, mCurrentTarget(nullptr)
// init d&d gesture state machine variables
, mGestureDownPoint(0,0)
, mPresContext(nullptr)
, mLClickCount(0)
, mMClickCount(0)
, mRClickCount(0)
, m_haveShutdown(false)
{
if (sESMInstanceCount == 0) {
gUserInteractionTimerCallback = new UITimerCallback();
if (gUserInteractionTimerCallback)
NS_ADDREF(gUserInteractionTimerCallback);
UpdateUserActivityTimer();
}
++sESMInstanceCount;
static bool sAddedPointerEventEnabled = false;
if (!sAddedPointerEventEnabled) {
Preferences::AddBoolVarCache(&sPointerEventEnabled,
"dom.w3c_pointer_events.enabled", false);
sAddedPointerEventEnabled = true;
}
}
nsresult
EventStateManager::UpdateUserActivityTimer()
{
if (!gUserInteractionTimerCallback)
return NS_OK;
if (!gUserInteractionTimer)
CallCreateInstance("@mozilla.org/timer;1", &gUserInteractionTimer);
if (gUserInteractionTimer) {
gUserInteractionTimer->InitWithCallback(gUserInteractionTimerCallback,
NS_USER_INTERACTION_INTERVAL,
nsITimer::TYPE_ONE_SHOT);
}
return NS_OK;
}
nsresult
EventStateManager::Init()
{
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (!observerService)
return NS_ERROR_FAILURE;
observerService->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, true);
if (sESMInstanceCount == 1) {
Prefs::Init();
}
return NS_OK;
}
EventStateManager::~EventStateManager()
{
ReleaseCurrentIMEContentObserver();
if (sActiveESM == this) {
sActiveESM = nullptr;
}
if (Prefs::ClickHoldContextMenu())
KillClickHoldTimer();
if (mDocument == sMouseOverDocument)
sMouseOverDocument = nullptr;
--sESMInstanceCount;
if(sESMInstanceCount == 0) {
WheelTransaction::Shutdown();
if (gUserInteractionTimerCallback) {
gUserInteractionTimerCallback->Notify(nullptr);
NS_RELEASE(gUserInteractionTimerCallback);
}
if (gUserInteractionTimer) {
gUserInteractionTimer->Cancel();
NS_RELEASE(gUserInteractionTimer);
}
Prefs::Shutdown();
WheelPrefs::Shutdown();
DeltaAccumulator::Shutdown();
}
if (sDragOverContent && sDragOverContent->OwnerDoc() == mDocument) {
sDragOverContent = nullptr;
}
if (!m_haveShutdown) {
Shutdown();
// Don't remove from Observer service in Shutdown because Shutdown also
// gets called from xpcom shutdown observer. And we don't want to remove
// from the service in that case.
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
observerService->RemoveObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID);
}
}
}
nsresult
EventStateManager::Shutdown()
{
m_haveShutdown = true;
return NS_OK;
}
NS_IMETHODIMP
EventStateManager::Observe(nsISupports* aSubject,
const char* aTopic,
const char16_t *someData)
{
if (!nsCRT::strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
Shutdown();
}
return NS_OK;
}
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(EventStateManager)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIObserver)
NS_INTERFACE_MAP_ENTRY(nsIObserver)
NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(EventStateManager)
NS_IMPL_CYCLE_COLLECTING_RELEASE(EventStateManager)
NS_IMPL_CYCLE_COLLECTION(EventStateManager,
mCurrentTargetContent,
mGestureDownContent,
mGestureDownFrameOwner,
mLastLeftMouseDownContent,
mLastLeftMouseDownContentParent,
mLastMiddleMouseDownContent,
mLastMiddleMouseDownContentParent,
mLastRightMouseDownContent,
mLastRightMouseDownContentParent,
mActiveContent,
mHoverContent,
mURLTargetContent,
mMouseEnterLeaveHelper,
mPointersEnterLeaveHelper,
mDocument,
mIMEContentObserver,
mAccessKeys)
void
EventStateManager::ReleaseCurrentIMEContentObserver()
{
if (mIMEContentObserver) {
mIMEContentObserver->DisconnectFromEventStateManager();
}
mIMEContentObserver = nullptr;
}
void
EventStateManager::OnStartToObserveContent(
IMEContentObserver* aIMEContentObserver)
{
ReleaseCurrentIMEContentObserver();
mIMEContentObserver = aIMEContentObserver;
}
void
EventStateManager::OnStopObservingContent(
IMEContentObserver* aIMEContentObserver)
{
aIMEContentObserver->DisconnectFromEventStateManager();
NS_ENSURE_TRUE_VOID(mIMEContentObserver == aIMEContentObserver);
mIMEContentObserver = nullptr;
}
nsresult
EventStateManager::PreHandleEvent(nsPresContext* aPresContext,
WidgetEvent* aEvent,
nsIFrame* aTargetFrame,
nsIContent* aTargetContent,
nsEventStatus* aStatus)
{
NS_ENSURE_ARG_POINTER(aStatus);
NS_ENSURE_ARG(aPresContext);
if (!aEvent) {
NS_ERROR("aEvent is null. This should never happen.");
return NS_ERROR_NULL_POINTER;
}
NS_WARN_IF_FALSE(!aTargetFrame ||
!aTargetFrame->GetContent() ||
aTargetFrame->GetContent() == aTargetContent ||
aTargetFrame->GetContent()->GetParent() == aTargetContent,
"aTargetFrame should be related with aTargetContent");
mCurrentTarget = aTargetFrame;
mCurrentTargetContent = nullptr;
// Do not take account NS_MOUSE_ENTER_WIDGET/EXIT_WIDGET so that loading a page
// when user is not active doesn't change the state to active.
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
if (aEvent->mFlags.mIsTrusted &&
((mouseEvent && mouseEvent->IsReal() &&
mouseEvent->message != NS_MOUSE_ENTER_WIDGET &&
mouseEvent->message != NS_MOUSE_EXIT_WIDGET) ||
aEvent->mClass == eWheelEventClass ||
aEvent->mClass == eKeyboardEventClass)) {
if (gMouseOrKeyboardEventCounter == 0) {
nsCOMPtr<nsIObserverService> obs =
mozilla::services::GetObserverService();
if (obs) {
obs->NotifyObservers(nullptr, "user-interaction-active", nullptr);
UpdateUserActivityTimer();
}
}
++gMouseOrKeyboardEventCounter;
}
WheelTransaction::OnEvent(aEvent);
// Focus events don't necessarily need a frame.
if (!mCurrentTarget && !aTargetContent) {
NS_ERROR("mCurrentTarget and aTargetContent are null");
return NS_ERROR_NULL_POINTER;
}
#ifdef DEBUG
if (aEvent->HasDragEventMessage() && sIsPointerLocked) {
NS_ASSERTION(sIsPointerLocked,
"sIsPointerLocked is true. Drag events should be suppressed when "
"the pointer is locked.");
}
#endif
// Store last known screenPoint and clientPoint so pointer lock
// can use these values as constants.
if (aEvent->mFlags.mIsTrusted &&
((mouseEvent && mouseEvent->IsReal()) ||
aEvent->mClass == eWheelEventClass) &&
!sIsPointerLocked) {
sLastScreenPoint =
UIEvent::CalculateScreenPoint(aPresContext, aEvent);
sLastClientPoint =
UIEvent::CalculateClientPoint(aPresContext, aEvent, nullptr);
}
*aStatus = nsEventStatus_eIgnore;
switch (aEvent->message) {
case NS_CONTEXTMENU:
if (sIsPointerLocked) {
return NS_ERROR_DOM_INVALID_STATE_ERR;
}
break;
case NS_MOUSE_BUTTON_DOWN: {
switch (mouseEvent->button) {
case WidgetMouseEvent::eLeftButton:
BeginTrackingDragGesture(aPresContext, mouseEvent, aTargetFrame);
mLClickCount = mouseEvent->clickCount;
SetClickCount(aPresContext, mouseEvent, aStatus);
sNormalLMouseEventInProcess = true;
break;
case WidgetMouseEvent::eMiddleButton:
mMClickCount = mouseEvent->clickCount;
SetClickCount(aPresContext, mouseEvent, aStatus);
break;
case WidgetMouseEvent::eRightButton:
mRClickCount = mouseEvent->clickCount;
SetClickCount(aPresContext, mouseEvent, aStatus);
break;
}
break;
}
case NS_MOUSE_BUTTON_UP: {
switch (mouseEvent->button) {
case WidgetMouseEvent::eLeftButton:
if (Prefs::ClickHoldContextMenu()) {
KillClickHoldTimer();
}
StopTrackingDragGesture();
sNormalLMouseEventInProcess = false;
// then fall through...
case WidgetMouseEvent::eRightButton:
case WidgetMouseEvent::eMiddleButton:
SetClickCount(aPresContext, mouseEvent, aStatus);
break;
}
break;
}
case NS_MOUSE_ENTER_WIDGET:
// In some cases on e10s NS_MOUSE_ENTER_WIDGET
// event was sent twice into child process of content.
// (From specific widget code (sending is not permanent) and
// from ESM::DispatchMouseOrPointerEvent (sending is permanent)).
// Flag mNoCrossProcessBoundaryForwarding helps to
// suppress sending accidental event from widget code.
aEvent->mFlags.mNoCrossProcessBoundaryForwarding = true;
break;
case NS_MOUSE_EXIT_WIDGET:
// If this is a remote frame, we receive NS_MOUSE_EXIT_WIDGET from the parent
// the mouse exits our content. Since the parent may update the cursor
// while the mouse is outside our frame, and since PuppetWidget caches the
// current cursor internally, re-entering our content (say from over a
// window edge) wont update the cursor if the cached value and the current
// cursor match. So when the mouse exits a remote frame, clear the cached
// widget cursor so a proper update will occur when the mouse re-enters.
if (XRE_GetProcessType() == GeckoProcessType_Content) {
ClearCachedWidgetCursor(mCurrentTarget);
}
// Flag helps to suppress double event sending into process of content.
// For more information see comment above, at NS_MOUSE_ENTER_WIDGET case.
aEvent->mFlags.mNoCrossProcessBoundaryForwarding = true;
// If the event is not a top-level window exit, then it's not
// really an exit --- we may have traversed widget boundaries but
// we're still in our toplevel window.
if (mouseEvent->exit != WidgetMouseEvent::eTopLevel) {
// Treat it as a synthetic move so we don't generate spurious
// "exit" or "move" events. Any necessary "out" or "over" events
// will be generated by GenerateMouseEnterExit
mouseEvent->message = NS_MOUSE_MOVE;
mouseEvent->reason = WidgetMouseEvent::eSynthesized;
// then fall through...
} else {
if (sPointerEventEnabled) {
// We should synthetize corresponding pointer events
GeneratePointerEnterExit(NS_POINTER_LEAVE, mouseEvent);
}
GenerateMouseEnterExit(mouseEvent);
//This is a window level mouse exit event and should stop here
aEvent->message = 0;
break;
}
case NS_MOUSE_MOVE:
case NS_POINTER_DOWN:
case NS_POINTER_MOVE: {
// on the Mac, GenerateDragGesture() may not return until the drag
// has completed and so |aTargetFrame| may have been deleted (moving
// a bookmark, for example). If this is the case, however, we know
// that ClearFrameRefs() has been called and it cleared out
// |mCurrentTarget|. As a result, we should pass |mCurrentTarget|
// into UpdateCursor().
GenerateDragGesture(aPresContext, mouseEvent);
UpdateCursor(aPresContext, aEvent, mCurrentTarget, aStatus);
GenerateMouseEnterExit(mouseEvent);
// Flush pending layout changes, so that later mouse move events
// will go to the right nodes.
FlushPendingEvents(aPresContext);
break;
}
case NS_DRAGDROP_GESTURE:
if (Prefs::ClickHoldContextMenu()) {
// an external drag gesture event came in, not generated internally
// by Gecko. Make sure we get rid of the click-hold timer.
KillClickHoldTimer();
}
break;
case NS_DRAGDROP_OVER:
// NS_DRAGDROP_DROP is fired before NS_DRAGDROP_DRAGDROP so send
// the enter/exit events before NS_DRAGDROP_DROP.
GenerateDragDropEnterExit(aPresContext, aEvent->AsDragEvent());
break;
case NS_KEY_PRESS:
{
WidgetKeyboardEvent* keyEvent = aEvent->AsKeyboardEvent();
int32_t modifierMask = 0;
if (keyEvent->IsShift())
modifierMask |= NS_MODIFIER_SHIFT;
if (keyEvent->IsControl())
modifierMask |= NS_MODIFIER_CONTROL;
if (keyEvent->IsAlt())
modifierMask |= NS_MODIFIER_ALT;
if (keyEvent->IsMeta())
modifierMask |= NS_MODIFIER_META;
if (keyEvent->IsOS())
modifierMask |= NS_MODIFIER_OS;
// Prevent keyboard scrolling while an accesskey modifier is in use.
if (modifierMask &&
(modifierMask == Prefs::ChromeAccessModifierMask() ||
modifierMask == Prefs::ContentAccessModifierMask())) {
HandleAccessKey(aPresContext, keyEvent, aStatus, nullptr,
eAccessKeyProcessingNormal, modifierMask);
}
}
// then fall through...
case NS_KEY_BEFORE_DOWN:
case NS_KEY_DOWN:
case NS_KEY_AFTER_DOWN:
case NS_KEY_BEFORE_UP:
case NS_KEY_UP:
case NS_KEY_AFTER_UP:
{
nsIContent* content = GetFocusedContent();
if (content)
mCurrentTargetContent = content;
// NOTE: Don't refer TextComposition::IsComposing() since DOM Level 3
// Events defines that KeyboardEvent.isComposing is true when it's
// dispatched after compositionstart and compositionend.
// TextComposition::IsComposing() is false even before
// compositionend if there is no composing string.
WidgetKeyboardEvent* keyEvent = aEvent->AsKeyboardEvent();
nsRefPtr<TextComposition> composition =
IMEStateManager::GetTextCompositionFor(keyEvent);
keyEvent->mIsComposing = !!composition;
}
break;
case NS_WHEEL_WHEEL:
case NS_WHEEL_START:
case NS_WHEEL_STOP:
{
NS_ASSERTION(aEvent->mFlags.mIsTrusted,
"Untrusted wheel event shouldn't be here");
nsIContent* content = GetFocusedContent();
if (content) {
mCurrentTargetContent = content;
}
if (aEvent->message != NS_WHEEL_WHEEL) {
break;
}
WidgetWheelEvent* wheelEvent = aEvent->AsWheelEvent();
WheelPrefs::GetInstance()->ApplyUserPrefsToDelta(wheelEvent);
// If we won't dispatch a DOM event for this event, nothing to do anymore.
if (!wheelEvent->IsAllowedToDispatchDOMEvent()) {
break;
}
// Init lineOrPageDelta values for line scroll events for some devices
// on some platforms which might dispatch wheel events which don't have
// lineOrPageDelta values. And also, if delta values are customized by
// prefs, this recomputes them.
DeltaAccumulator::GetInstance()->
InitLineOrPageDelta(aTargetFrame, this, wheelEvent);
}
break;
case NS_QUERY_SELECTED_TEXT:
DoQuerySelectedText(aEvent->AsQueryContentEvent());
break;
case NS_QUERY_TEXT_CONTENT:
{
if (RemoteQueryContentEvent(aEvent)) {
break;
}
ContentEventHandler handler(mPresContext);
handler.OnQueryTextContent(aEvent->AsQueryContentEvent());
}
break;
case NS_QUERY_CARET_RECT:
{
if (RemoteQueryContentEvent(aEvent)) {
break;
}
ContentEventHandler handler(mPresContext);
handler.OnQueryCaretRect(aEvent->AsQueryContentEvent());
}
break;
case NS_QUERY_TEXT_RECT:
{
if (RemoteQueryContentEvent(aEvent)) {
break;
}
ContentEventHandler handler(mPresContext);
handler.OnQueryTextRect(aEvent->AsQueryContentEvent());
}
break;
case NS_QUERY_EDITOR_RECT:
{
if (RemoteQueryContentEvent(aEvent)) {
break;
}
ContentEventHandler handler(mPresContext);
handler.OnQueryEditorRect(aEvent->AsQueryContentEvent());
}
break;
case NS_QUERY_CONTENT_STATE:
{
// XXX remote event
ContentEventHandler handler(mPresContext);
handler.OnQueryContentState(aEvent->AsQueryContentEvent());
}
break;
case NS_QUERY_SELECTION_AS_TRANSFERABLE:
{
// XXX remote event
ContentEventHandler handler(mPresContext);
handler.OnQuerySelectionAsTransferable(aEvent->AsQueryContentEvent());
}
break;
case NS_QUERY_CHARACTER_AT_POINT:
{
// XXX remote event
ContentEventHandler handler(mPresContext);
handler.OnQueryCharacterAtPoint(aEvent->AsQueryContentEvent());
}
break;
case NS_QUERY_DOM_WIDGET_HITTEST:
{
// XXX remote event
ContentEventHandler handler(mPresContext);
handler.OnQueryDOMWidgetHittest(aEvent->AsQueryContentEvent());
}
break;
case NS_SELECTION_SET:
{
WidgetSelectionEvent* selectionEvent = aEvent->AsSelectionEvent();
if (IsTargetCrossProcess(selectionEvent)) {
// Will not be handled locally, remote the event
if (GetCrossProcessTarget()->SendSelectionEvent(*selectionEvent)) {
selectionEvent->mSucceeded = true;
}
break;
}
ContentEventHandler handler(mPresContext);
handler.OnSelectionEvent(selectionEvent);
}
break;
case NS_CONTENT_COMMAND_CUT:
case NS_CONTENT_COMMAND_COPY:
case NS_CONTENT_COMMAND_PASTE:
case NS_CONTENT_COMMAND_DELETE:
case NS_CONTENT_COMMAND_UNDO:
case NS_CONTENT_COMMAND_REDO:
case NS_CONTENT_COMMAND_PASTE_TRANSFERABLE:
{
DoContentCommandEvent(aEvent->AsContentCommandEvent());
}
break;
case NS_CONTENT_COMMAND_SCROLL:
{
DoContentCommandScrollEvent(aEvent->AsContentCommandEvent());
}
break;
case NS_COMPOSITION_START:
if (aEvent->mFlags.mIsTrusted) {
// If the event is trusted event, set the selected text to data of
// composition event.
WidgetCompositionEvent* compositionEvent = aEvent->AsCompositionEvent();
WidgetQueryContentEvent selectedText(true, NS_QUERY_SELECTED_TEXT,
compositionEvent->widget);
DoQuerySelectedText(&selectedText);
NS_ASSERTION(selectedText.mSucceeded, "Failed to get selected text");
compositionEvent->mData = selectedText.mReply.mString;
}
// through to compositionend handling
case NS_COMPOSITION_END:
case NS_COMPOSITION_CHANGE:
case NS_COMPOSITION_COMMIT_AS_IS:
case NS_COMPOSITION_COMMIT:
{
WidgetCompositionEvent* compositionEvent = aEvent->AsCompositionEvent();
if (IsTargetCrossProcess(compositionEvent)) {
// Will not be handled locally, remote the event
if (GetCrossProcessTarget()->SendCompositionEvent(*compositionEvent)) {
// Cancel local dispatching
aEvent->mFlags.mPropagationStopped = true;
}
}
}
break;
}
return NS_OK;
}
// static
int32_t
EventStateManager::GetAccessModifierMaskFor(nsISupports* aDocShell)
{
nsCOMPtr<nsIDocShellTreeItem> treeItem(do_QueryInterface(aDocShell));
if (!treeItem)
return -1; // invalid modifier
switch (treeItem->ItemType()) {
case nsIDocShellTreeItem::typeChrome:
return Prefs::ChromeAccessModifierMask();
case nsIDocShellTreeItem::typeContent:
return Prefs::ContentAccessModifierMask();
default:
return -1; // invalid modifier
}
}
static bool
IsAccessKeyTarget(nsIContent* aContent, nsIFrame* aFrame, nsAString& aKey)
{
// Use GetAttr because we want Unicode case=insensitive matching
// XXXbz shouldn't this be case-sensitive, per spec?
nsString contentKey;
if (!aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::accesskey, contentKey) ||
!contentKey.Equals(aKey, nsCaseInsensitiveStringComparator()))
return false;
nsCOMPtr<nsIDOMXULDocument> xulDoc =
do_QueryInterface(aContent->OwnerDoc());
if (!xulDoc && !aContent->IsXULElement())
return true;
// For XUL we do visibility checks.
if (!aFrame)
return false;
if (aFrame->IsFocusable())
return true;
if (!aFrame->IsVisibleConsideringAncestors())
return false;
// XUL controls can be activated.
nsCOMPtr<nsIDOMXULControlElement> control(do_QueryInterface(aContent));
if (control)
return true;
// HTML area, label and legend elements are never focusable, so
// we need to check for them explicitly before giving up.
if (aContent->IsAnyOfHTMLElements(nsGkAtoms::area,
nsGkAtoms::label,
nsGkAtoms::legend)) {
return true;
}
// XUL label elements are never focusable, so we need to check for them
// explicitly before giving up.
if (aContent->IsXULElement(nsGkAtoms::label)) {
return true;
}
return false;
}
bool
EventStateManager::ExecuteAccessKey(nsTArray<uint32_t>& aAccessCharCodes,
bool aIsTrustedEvent)
{
int32_t count, start = -1;
nsIContent* focusedContent = GetFocusedContent();
if (focusedContent) {
start = mAccessKeys.IndexOf(focusedContent);
if (start == -1 && focusedContent->GetBindingParent())
start = mAccessKeys.IndexOf(focusedContent->GetBindingParent());
}
nsIContent *content;
nsIFrame *frame;
int32_t length = mAccessKeys.Count();
for (uint32_t i = 0; i < aAccessCharCodes.Length(); ++i) {
uint32_t ch = aAccessCharCodes[i];
nsAutoString accessKey;
AppendUCS4ToUTF16(ch, accessKey);
for (count = 1; count <= length; ++count) {
content = mAccessKeys[(start + count) % length];
frame = content->GetPrimaryFrame();
if (IsAccessKeyTarget(content, frame, accessKey)) {
bool shouldActivate = Prefs::KeyCausesActivation();
while (shouldActivate && ++count <= length) {
nsIContent *oc = mAccessKeys[(start + count) % length];
nsIFrame *of = oc->GetPrimaryFrame();
if (IsAccessKeyTarget(oc, of, accessKey))
shouldActivate = false;
}
if (shouldActivate)
content->PerformAccesskey(shouldActivate, aIsTrustedEvent);
else {
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm) {
nsCOMPtr<nsIDOMElement> element = do_QueryInterface(content);
fm->SetFocus(element, nsIFocusManager::FLAG_BYKEY);
}
}
return true;
}
}
}
return false;
}
// static
void
EventStateManager::GetAccessKeyLabelPrefix(Element* aElement, nsAString& aPrefix)
{
aPrefix.Truncate();
nsAutoString separator, modifierText;
nsContentUtils::GetModifierSeparatorText(separator);
nsCOMPtr<nsISupports> container = aElement->OwnerDoc()->GetDocShell();
int32_t modifierMask = GetAccessModifierMaskFor(container);
if (modifierMask == -1) {
return;
}
if (modifierMask & NS_MODIFIER_CONTROL) {
nsContentUtils::GetControlText(modifierText);
aPrefix.Append(modifierText + separator);
}
if (modifierMask & NS_MODIFIER_META) {
nsContentUtils::GetMetaText(modifierText);
aPrefix.Append(modifierText + separator);
}
if (modifierMask & NS_MODIFIER_OS) {
nsContentUtils::GetOSText(modifierText);
aPrefix.Append(modifierText + separator);
}
if (modifierMask & NS_MODIFIER_ALT) {
nsContentUtils::GetAltText(modifierText);
aPrefix.Append(modifierText + separator);
}
if (modifierMask & NS_MODIFIER_SHIFT) {
nsContentUtils::GetShiftText(modifierText);
aPrefix.Append(modifierText + separator);
}
}
void
EventStateManager::HandleAccessKey(nsPresContext* aPresContext,
WidgetKeyboardEvent* aEvent,
nsEventStatus* aStatus,
nsIDocShellTreeItem* aBubbledFrom,
ProcessingAccessKeyState aAccessKeyState,
int32_t aModifierMask)
{
nsCOMPtr<nsIDocShell> docShell = aPresContext->GetDocShell();
// Alt or other accesskey modifier is down, we may need to do an accesskey
if (mAccessKeys.Count() > 0 &&
aModifierMask == GetAccessModifierMaskFor(docShell)) {
// Someone registered an accesskey. Find and activate it.
nsAutoTArray<uint32_t, 10> accessCharCodes;
nsContentUtils::GetAccessKeyCandidates(aEvent, accessCharCodes);
if (ExecuteAccessKey(accessCharCodes, aEvent->mFlags.mIsTrusted)) {
*aStatus = nsEventStatus_eConsumeNoDefault;
return;
}
}
// after the local accesskey handling
if (nsEventStatus_eConsumeNoDefault != *aStatus) {
// checking all sub docshells
if (!docShell) {
NS_WARNING("no docShellTreeNode for presContext");
return;
}
int32_t childCount;
docShell->GetChildCount(&childCount);
for (int32_t counter = 0; counter < childCount; counter++) {
// Not processing the child which bubbles up the handling
nsCOMPtr<nsIDocShellTreeItem> subShellItem;
docShell->GetChildAt(counter, getter_AddRefs(subShellItem));
if (aAccessKeyState == eAccessKeyProcessingUp &&
subShellItem == aBubbledFrom)
continue;
nsCOMPtr<nsIDocShell> subDS = do_QueryInterface(subShellItem);
if (subDS && IsShellVisible(subDS)) {
nsCOMPtr<nsIPresShell> subPS = subDS->GetPresShell();
// Docshells need not have a presshell (eg. display:none
// iframes, docshells in transition between documents, etc).
if (!subPS) {
// Oh, well. Just move on to the next child
continue;
}
nsPresContext *subPC = subPS->GetPresContext();
EventStateManager* esm =
static_cast<EventStateManager*>(subPC->EventStateManager());
if (esm)
esm->HandleAccessKey(subPC, aEvent, aStatus, nullptr,
eAccessKeyProcessingDown, aModifierMask);
if (nsEventStatus_eConsumeNoDefault == *aStatus)
break;
}
}
}// if end . checking all sub docshell ends here.
// bubble up the process to the parent docshell if necessary
if (eAccessKeyProcessingDown != aAccessKeyState && nsEventStatus_eConsumeNoDefault != *aStatus) {
if (!docShell) {
NS_WARNING("no docShellTreeItem for presContext");
return;
}
nsCOMPtr<nsIDocShellTreeItem> parentShellItem;
docShell->GetParent(getter_AddRefs(parentShellItem));
nsCOMPtr<nsIDocShell> parentDS = do_QueryInterface(parentShellItem);
if (parentDS) {
nsCOMPtr<nsIPresShell> parentPS = parentDS->GetPresShell();
NS_ASSERTION(parentPS, "Our PresShell exists but the parent's does not?");
nsPresContext *parentPC = parentPS->GetPresContext();
NS_ASSERTION(parentPC, "PresShell without PresContext");
EventStateManager* esm =
static_cast<EventStateManager*>(parentPC->EventStateManager());
if (esm)
esm->HandleAccessKey(parentPC, aEvent, aStatus, docShell,
eAccessKeyProcessingUp, aModifierMask);
}
}// if end. bubble up process
}// end of HandleAccessKey
bool
EventStateManager::DispatchCrossProcessEvent(WidgetEvent* aEvent,
nsFrameLoader* aFrameLoader,
nsEventStatus *aStatus) {
TabParent* remote = TabParent::GetFrom(aFrameLoader);
if (!remote) {
return false;
}
switch (aEvent->mClass) {
case eMouseEventClass: {
return remote->SendRealMouseEvent(*aEvent->AsMouseEvent());
}
case eKeyboardEventClass: {
return remote->SendRealKeyEvent(*aEvent->AsKeyboardEvent());
}
case eWheelEventClass: {
return remote->SendMouseWheelEvent(*aEvent->AsWheelEvent());
}
case eTouchEventClass: {
// Let the child process synthesize a mouse event if needed, and
// ensure we don't synthesize one in this process.
*aStatus = nsEventStatus_eConsumeNoDefault;
return remote->SendRealTouchEvent(*aEvent->AsTouchEvent());
}
case eDragEventClass: {
if (remote->Manager()->IsContentParent()) {
remote->Manager()->AsContentParent()->MaybeInvokeDragSession(remote);
}
nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
uint32_t dropEffect = nsIDragService::DRAGDROP_ACTION_NONE;
uint32_t action = nsIDragService::DRAGDROP_ACTION_NONE;
if (dragSession) {
dragSession->DragEventDispatchedToChildProcess();
dragSession->GetDragAction(&action);
nsCOMPtr<nsIDOMDataTransfer> initialDataTransfer;
dragSession->GetDataTransfer(getter_AddRefs(initialDataTransfer));
if (initialDataTransfer) {
initialDataTransfer->GetDropEffectInt(&dropEffect);
}
}
bool retval = remote->SendRealDragEvent(*aEvent->AsDragEvent(),
action, dropEffect);
return retval;
}
default: {
MOZ_CRASH("Attempt to send non-whitelisted event?");
}
}
}
bool
EventStateManager::IsRemoteTarget(nsIContent* target) {
if (!target) {
return false;
}
// <browser/iframe remote=true> from XUL
if (target->IsAnyOfXULElements(nsGkAtoms::browser, nsGkAtoms::iframe) &&
target->AttrValueIs(kNameSpaceID_None, nsGkAtoms::Remote,
nsGkAtoms::_true, eIgnoreCase)) {
return true;
}
// <frame/iframe mozbrowser/mozapp>
nsCOMPtr<nsIMozBrowserFrame> browserFrame = do_QueryInterface(target);
if (browserFrame && browserFrame->GetReallyIsBrowserOrApp()) {
return !!TabParent::GetFrom(target);
}
return false;
}
bool
CrossProcessSafeEvent(const WidgetEvent& aEvent)
{
switch (aEvent.mClass) {
case eKeyboardEventClass:
case eWheelEventClass:
return true;
case eMouseEventClass:
switch (aEvent.message) {
case NS_MOUSE_BUTTON_DOWN:
case NS_MOUSE_BUTTON_UP:
case NS_MOUSE_MOVE:
case NS_CONTEXTMENU:
case NS_MOUSE_ENTER_WIDGET:
case NS_MOUSE_EXIT_WIDGET:
return true;
default:
return false;
}
case eTouchEventClass:
switch (aEvent.message) {
case NS_TOUCH_START:
case NS_TOUCH_MOVE:
case NS_TOUCH_END:
case NS_TOUCH_CANCEL:
return true;
default:
return false;
}
case eDragEventClass:
switch (aEvent.message) {
case NS_DRAGDROP_OVER:
case NS_DRAGDROP_EXIT:
case NS_DRAGDROP_DROP:
return true;
}
default:
return false;
}
}
bool
EventStateManager::HandleCrossProcessEvent(WidgetEvent* aEvent,
nsEventStatus *aStatus) {
if (*aStatus == nsEventStatus_eConsumeNoDefault ||
aEvent->mFlags.mNoCrossProcessBoundaryForwarding ||
!CrossProcessSafeEvent(*aEvent)) {
return false;
}
// Collect the remote event targets we're going to forward this
// event to.
//
// NB: the elements of |targets| must be unique, for correctness.
nsAutoTArray<nsCOMPtr<nsIContent>, 1> targets;
if (aEvent->mClass != eTouchEventClass ||
aEvent->message == NS_TOUCH_START) {
// If this event only has one target, and it's remote, add it to
// the array.
nsIFrame* frame = GetEventTarget();
nsIContent* target = frame ? frame->GetContent() : nullptr;
if (IsRemoteTarget(target)) {
targets.AppendElement(target);
}
} else {
// This is a touch event with possibly multiple touch points.
// Each touch point may have its own target. So iterate through
// all of them and collect the unique set of targets for event
// forwarding.
//
// This loop is similar to the one used in
// PresShell::DispatchTouchEvent().
const WidgetTouchEvent::TouchArray& touches =
aEvent->AsTouchEvent()->touches;
for (uint32_t i = 0; i < touches.Length(); ++i) {
Touch* touch = touches[i];
// NB: the |mChanged| check is an optimization, subprocesses can
// compute this for themselves. If the touch hasn't changed, we
// may be able to avoid forwarding the event entirely (which is
// not free).
if (!touch || !touch->mChanged) {
continue;
}
nsCOMPtr<EventTarget> targetPtr = touch->mTarget;
if (!targetPtr) {
continue;
}
nsCOMPtr<nsIContent> target = do_QueryInterface(targetPtr);
if (IsRemoteTarget(target) && !targets.Contains(target)) {
targets.AppendElement(target);
}
}
}
if (targets.Length() == 0) {
return false;
}
// Look up the frame loader for all the remote targets we found, and
// then dispatch the event to the remote content they represent.
bool dispatched = false;
for (uint32_t i = 0; i < targets.Length(); ++i) {
nsIContent* target = targets[i];
nsCOMPtr<nsIFrameLoaderOwner> loaderOwner = do_QueryInterface(target);
if (!loaderOwner) {
continue;
}
nsRefPtr<nsFrameLoader> frameLoader = loaderOwner->GetFrameLoader();
if (!frameLoader) {
continue;
}
uint32_t eventMode;
frameLoader->GetEventMode(&eventMode);
if (eventMode == nsIFrameLoader::EVENT_MODE_DONT_FORWARD_TO_CHILD) {
continue;
}
dispatched |= DispatchCrossProcessEvent(aEvent, frameLoader, aStatus);
}
return dispatched;
}
//
// CreateClickHoldTimer
//
// Fire off a timer for determining if the user wants click-hold. This timer
// is a one-shot that will be cancelled when the user moves enough to fire
// a drag.
//
void
EventStateManager::CreateClickHoldTimer(nsPresContext* inPresContext,
nsIFrame* inDownFrame,
WidgetGUIEvent* inMouseDownEvent)
{
if (!inMouseDownEvent->mFlags.mIsTrusted ||
IsRemoteTarget(mGestureDownContent) ||
sIsPointerLocked) {
return;
}
// just to be anal (er, safe)
if (mClickHoldTimer) {
mClickHoldTimer->Cancel();
mClickHoldTimer = nullptr;
}
// if content clicked on has a popup, don't even start the timer
// since we'll end up conflicting and both will show.
if (mGestureDownContent) {
// check for the |popup| attribute
if (nsContentUtils::HasNonEmptyAttr(mGestureDownContent, kNameSpaceID_None,
nsGkAtoms::popup))
return;
// check for a <menubutton> like bookmarks
if (mGestureDownContent->IsXULElement(nsGkAtoms::menubutton))
return;
}
mClickHoldTimer = do_CreateInstance("@mozilla.org/timer;1");
if (mClickHoldTimer) {
int32_t clickHoldDelay =
Preferences::GetInt("ui.click_hold_context_menus.delay", 500);
mClickHoldTimer->InitWithFuncCallback(sClickHoldCallback, this,
clickHoldDelay,
nsITimer::TYPE_ONE_SHOT);
}
} // CreateClickHoldTimer
//
// KillClickHoldTimer
//
// Stop the timer that would show the context menu dead in its tracks
//
void
EventStateManager::KillClickHoldTimer()
{
if (mClickHoldTimer) {
mClickHoldTimer->Cancel();
mClickHoldTimer = nullptr;
}
}
//
// sClickHoldCallback
//
// This fires after the mouse has been down for a certain length of time.
//
void
EventStateManager::sClickHoldCallback(nsITimer* aTimer, void* aESM)
{
nsRefPtr<EventStateManager> self = static_cast<EventStateManager*>(aESM);
if (self) {
self->FireContextClick();
}
// NOTE: |aTimer| and |self->mAutoHideTimer| are invalid after calling ClosePopup();
} // sAutoHideCallback
//
// FireContextClick
//
// If we're this far, our timer has fired, which means the mouse has been down
// for a certain period of time and has not moved enough to generate a dragGesture.
// We can be certain the user wants a context-click at this stage, so generate
// a dom event and fire it in.
//
// After the event fires, check if PreventDefault() has been set on the event which
// means that someone either ate the event or put up a context menu. This is our cue
// to stop tracking the drag gesture. If we always did this, draggable items w/out
// a context menu wouldn't be draggable after a certain length of time, which is
// _not_ what we want.
//
void
EventStateManager::FireContextClick()
{
if (!mGestureDownContent || !mPresContext || sIsPointerLocked) {
return;
}
#ifdef XP_MACOSX
// Hack to ensure that we don't show a context menu when the user
// let go of the mouse after a long cpu-hogging operation prevented
// us from handling any OS events. See bug 117589.
if (!CGEventSourceButtonState(kCGEventSourceStateCombinedSessionState, kCGMouseButtonLeft))
return;
#endif
nsEventStatus status = nsEventStatus_eIgnore;
// Dispatch to the DOM. We have to fake out the ESM and tell it that the
// current target frame is actually where the mouseDown occurred, otherwise it
// will use the frame the mouse is currently over which may or may not be
// the same. (Note: saari and I have decided that we don't have to reset |mCurrentTarget|
// when we're through because no one else is doing anything more with this
// event and it will get reset on the very next event to the correct frame).
mCurrentTarget = mPresContext->GetPrimaryFrameFor(mGestureDownContent);
// make sure the widget sticks around
nsCOMPtr<nsIWidget> targetWidget;
if (mCurrentTarget && (targetWidget = mCurrentTarget->GetNearestWidget())) {
NS_ASSERTION(mPresContext == mCurrentTarget->PresContext(),
"a prescontext returned a primary frame that didn't belong to it?");
// before dispatching, check that we're not on something that
// doesn't get a context menu
bool allowedToDispatch = true;
if (mGestureDownContent->IsAnyOfXULElements(nsGkAtoms::scrollbar,
nsGkAtoms::scrollbarbutton,
nsGkAtoms::button)) {
allowedToDispatch = false;
} else if (mGestureDownContent->IsXULElement(nsGkAtoms::toolbarbutton)) {
// a <toolbarbutton> that has the container attribute set
// will already have its own dropdown.
if (nsContentUtils::HasNonEmptyAttr(mGestureDownContent,
kNameSpaceID_None, nsGkAtoms::container)) {
allowedToDispatch = false;
} else {
// If the toolbar button has an open menu, don't attempt to open
// a second menu
if (mGestureDownContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::open,
nsGkAtoms::_true, eCaseMatters)) {
allowedToDispatch = false;
}
}
}
else if (mGestureDownContent->IsHTMLElement()) {
nsCOMPtr<nsIFormControl> formCtrl(do_QueryInterface(mGestureDownContent));
if (formCtrl) {
allowedToDispatch = formCtrl->IsTextControl(false) ||
formCtrl->GetType() == NS_FORM_INPUT_FILE;
}
else if (mGestureDownContent->IsAnyOfHTMLElements(nsGkAtoms::applet,
nsGkAtoms::embed,
nsGkAtoms::object)) {
allowedToDispatch = false;
}
}
if (allowedToDispatch) {
// init the event while mCurrentTarget is still good
WidgetMouseEvent event(true, NS_CONTEXTMENU, targetWidget,
WidgetMouseEvent::eReal);
event.clickCount = 1;
FillInEventFromGestureDown(&event);
// stop selection tracking, we're in control now
if (mCurrentTarget)
{
nsRefPtr<nsFrameSelection> frameSel =
mCurrentTarget->GetFrameSelection();
if (frameSel && frameSel->GetDragState()) {
// note that this can cause selection changed events to fire if we're in
// a text field, which will null out mCurrentTarget
frameSel->SetDragState(false);
}
}
nsIDocument* doc = mGestureDownContent->GetCrossShadowCurrentDoc();
AutoHandlingUserInputStatePusher userInpStatePusher(true, &event, doc);
// dispatch to DOM
EventDispatcher::Dispatch(mGestureDownContent, mPresContext, &event,
nullptr, &status);
// We don't need to dispatch to frame handling because no frames
// watch NS_CONTEXTMENU except for nsMenuFrame and that's only for
// dismissal. That's just as well since we don't really know
// which frame to send it to.
}
}
// now check if the event has been handled. If so, stop tracking a drag
if (status == nsEventStatus_eConsumeNoDefault) {
StopTrackingDragGesture();
}
KillClickHoldTimer();
} // FireContextClick
//
// BeginTrackingDragGesture
//
// Record that the mouse has gone down and that we should move to TRACKING state
// of d&d gesture tracker.
//
// We also use this to track click-hold context menus. When the mouse goes down,
// fire off a short timer. If the timer goes off and we have yet to fire the
// drag gesture (ie, the mouse hasn't moved a certain distance), then we can
// assume the user wants a click-hold, so fire a context-click event. We only
// want to cancel the drag gesture if the context-click event is handled.
//
void
EventStateManager::BeginTrackingDragGesture(nsPresContext* aPresContext,
WidgetMouseEvent* inDownEvent,
nsIFrame* inDownFrame)
{
if (!inDownEvent->widget)
return;
// Note that |inDownEvent| could be either a mouse down event or a
// synthesized mouse move event.
mGestureDownPoint = inDownEvent->refPoint + inDownEvent->widget->WidgetToScreenOffset();
if (inDownFrame) {
inDownFrame->GetContentForEvent(inDownEvent,
getter_AddRefs(mGestureDownContent));
mGestureDownFrameOwner = inDownFrame->GetContent();
if (!mGestureDownFrameOwner) {
mGestureDownFrameOwner = mGestureDownContent;
}
}
mGestureModifiers = inDownEvent->modifiers;
mGestureDownButtons = inDownEvent->buttons;
if (Prefs::ClickHoldContextMenu()) {
// fire off a timer to track click-hold
CreateClickHoldTimer(aPresContext, inDownFrame, inDownEvent);
}
}
void
EventStateManager::BeginTrackingRemoteDragGesture(nsIContent* aContent)
{
mGestureDownContent = aContent;
mGestureDownFrameOwner = aContent;
}
//
// StopTrackingDragGesture
//
// Record that the mouse has gone back up so that we should leave the TRACKING
// state of d&d gesture tracker and return to the START state.
//
void
EventStateManager::StopTrackingDragGesture()
{
mGestureDownContent = nullptr;
mGestureDownFrameOwner = nullptr;
}
void
EventStateManager::FillInEventFromGestureDown(WidgetMouseEvent* aEvent)
{
NS_ASSERTION(aEvent->widget == mCurrentTarget->GetNearestWidget(),
"Incorrect widget in event");
// Set the coordinates in the new event to the coordinates of
// the old event, adjusted for the fact that the widget might be
// different
aEvent->refPoint = mGestureDownPoint - aEvent->widget->WidgetToScreenOffset();
aEvent->modifiers = mGestureModifiers;
aEvent->buttons = mGestureDownButtons;
}
//
// GenerateDragGesture
//
// If we're in the TRACKING state of the d&d gesture tracker, check the current position
// of the mouse in relation to the old one. If we've moved a sufficient amount from
// the mouse down, then fire off a drag gesture event.
void
EventStateManager::GenerateDragGesture(nsPresContext* aPresContext,
WidgetMouseEvent* aEvent)
{
NS_ASSERTION(aPresContext, "This shouldn't happen.");
if (IsTrackingDragGesture()) {
mCurrentTarget = mGestureDownFrameOwner->GetPrimaryFrame();
if (!mCurrentTarget) {
StopTrackingDragGesture();
return;
}
// Check if selection is tracking drag gestures, if so
// don't interfere!
if (mCurrentTarget)
{
nsRefPtr<nsFrameSelection> frameSel = mCurrentTarget->GetFrameSelection();
if (frameSel && frameSel->GetDragState()) {
StopTrackingDragGesture();
return;
}
}
// If non-native code is capturing the mouse don't start a drag.
if (nsIPresShell::IsMouseCapturePreventingDrag()) {
StopTrackingDragGesture();
return;
}
static int32_t pixelThresholdX = 0;
static int32_t pixelThresholdY = 0;
if (!pixelThresholdX) {
pixelThresholdX =
LookAndFeel::GetInt(LookAndFeel::eIntID_DragThresholdX, 0);
pixelThresholdY =
LookAndFeel::GetInt(LookAndFeel::eIntID_DragThresholdY, 0);
if (!pixelThresholdX)
pixelThresholdX = 5;
if (!pixelThresholdY)
pixelThresholdY = 5;
}
// fire drag gesture if mouse has moved enough
LayoutDeviceIntPoint pt = aEvent->refPoint + aEvent->widget->WidgetToScreenOffset();
LayoutDeviceIntPoint distance = pt - mGestureDownPoint;
if (Abs(distance.x) > AssertedCast<uint32_t>(pixelThresholdX) ||
Abs(distance.y) > AssertedCast<uint32_t>(pixelThresholdY)) {
if (Prefs::ClickHoldContextMenu()) {
// stop the click-hold before we fire off the drag gesture, in case
// it takes a long time
KillClickHoldTimer();
}
nsCOMPtr<nsISupports> container = aPresContext->GetContainerWeak();
nsCOMPtr<nsPIDOMWindow> window = do_GetInterface(container);
if (!window)
return;
nsRefPtr<DataTransfer> dataTransfer =
new DataTransfer(window, NS_DRAGDROP_START, false, -1);
nsCOMPtr<nsISelection> selection;
nsCOMPtr<nsIContent> eventContent, targetContent;
mCurrentTarget->GetContentForEvent(aEvent, getter_AddRefs(eventContent));
if (eventContent)
DetermineDragTargetAndDefaultData(window, eventContent, dataTransfer,
getter_AddRefs(selection),
getter_AddRefs(targetContent));
// Stop tracking the drag gesture now. This should stop us from
// reentering GenerateDragGesture inside DOM event processing.
StopTrackingDragGesture();
if (!targetContent)
return;
// Use our targetContent, now that we've determined it, as the
// parent object of the DataTransfer.
dataTransfer->SetParentObject(targetContent);
sLastDragOverFrame = nullptr;
nsCOMPtr<nsIWidget> widget = mCurrentTarget->GetNearestWidget();
// get the widget from the target frame
WidgetDragEvent startEvent(aEvent->mFlags.mIsTrusted,
NS_DRAGDROP_START, widget);
FillInEventFromGestureDown(&startEvent);
WidgetDragEvent gestureEvent(aEvent->mFlags.mIsTrusted,
NS_DRAGDROP_GESTURE, widget);
FillInEventFromGestureDown(&gestureEvent);
startEvent.dataTransfer = gestureEvent.dataTransfer = dataTransfer;
startEvent.inputSource = gestureEvent.inputSource = aEvent->inputSource;
// Dispatch to the DOM. By setting mCurrentTarget we are faking
// out the ESM and telling it that the current target frame is
// actually where the mouseDown occurred, otherwise it will use
// the frame the mouse is currently over which may or may not be
// the same. (Note: saari and I have decided that we don't have
// to reset |mCurrentTarget| when we're through because no one
// else is doing anything more with this event and it will get
// reset on the very next event to the correct frame).
// Hold onto old target content through the event and reset after.
nsCOMPtr<nsIContent> targetBeforeEvent = mCurrentTargetContent;
// Set the current target to the content for the mouse down
mCurrentTargetContent = targetContent;
// Dispatch both the dragstart and draggesture events to the DOM. For
// elements in an editor, only fire the draggesture event so that the
// editor code can handle it but content doesn't see a dragstart.
nsEventStatus status = nsEventStatus_eIgnore;
EventDispatcher::Dispatch(targetContent, aPresContext, &startEvent,
nullptr, &status);
WidgetDragEvent* event = &startEvent;
if (status != nsEventStatus_eConsumeNoDefault) {
status = nsEventStatus_eIgnore;
EventDispatcher::Dispatch(targetContent, aPresContext, &gestureEvent,
nullptr, &status);
event = &gestureEvent;
}
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
// Emit observer event to allow addons to modify the DataTransfer object.
if (observerService) {
observerService->NotifyObservers(dataTransfer,
"on-datatransfer-available",
nullptr);
}
// now that the dataTransfer has been updated in the dragstart and
// draggesture events, make it read only so that the data doesn't
// change during the drag.
dataTransfer->SetReadOnly();
if (status != nsEventStatus_eConsumeNoDefault) {
bool dragStarted = DoDefaultDragStart(aPresContext, event, dataTransfer,
targetContent, selection);
if (dragStarted) {
sActiveESM = nullptr;
aEvent->mFlags.mPropagationStopped = true;
}
}
// Note that frame event handling doesn't care about NS_DRAGDROP_GESTURE,
// which is just as well since we don't really know which frame to
// send it to
// Reset mCurretTargetContent to what it was
mCurrentTargetContent = targetBeforeEvent;
}
// Now flush all pending notifications, for better responsiveness
// while dragging.
FlushPendingEvents(aPresContext);
}
} // GenerateDragGesture
void
EventStateManager::DetermineDragTargetAndDefaultData(nsPIDOMWindow* aWindow,
nsIContent* aSelectionTarget,
DataTransfer* aDataTransfer,
nsISelection** aSelection,
nsIContent** aTargetNode)
{
*aTargetNode = nullptr;
// GetDragData determines if a selection, link or image in the content
// should be dragged, and places the data associated with the drag in the
// data transfer.
// mGestureDownContent is the node where the mousedown event for the drag
// occurred, and aSelectionTarget is the node to use when a selection is used
bool canDrag;
nsCOMPtr<nsIContent> dragDataNode;
bool wasAlt = (mGestureModifiers & MODIFIER_ALT) != 0;
nsresult rv = nsContentAreaDragDrop::GetDragData(aWindow, mGestureDownContent,
aSelectionTarget, wasAlt,
aDataTransfer, &canDrag, aSelection,
getter_AddRefs(dragDataNode));
if (NS_FAILED(rv) || !canDrag)
return;
// if GetDragData returned a node, use that as the node being dragged.
// Otherwise, if a selection is being dragged, use the node within the
// selection that was dragged. Otherwise, just use the mousedown target.
nsIContent* dragContent = mGestureDownContent;
if (dragDataNode)
dragContent = dragDataNode;
else if (*aSelection)
dragContent = aSelectionTarget;
nsIContent* originalDragContent = dragContent;
// If a selection isn't being dragged, look for an ancestor with the
// draggable property set. If one is found, use that as the target of the
// drag instead of the node that was clicked on. If a draggable node wasn't
// found, just use the clicked node.
if (!*aSelection) {
while (dragContent) {
nsCOMPtr<nsIDOMHTMLElement> htmlElement = do_QueryInterface(dragContent);
if (htmlElement) {
bool draggable = false;
htmlElement->GetDraggable(&draggable);
if (draggable)
break;
}
else {
nsCOMPtr<nsIDOMXULElement> xulElement = do_QueryInterface(dragContent);
if (xulElement) {
// All XUL elements are draggable, so if a XUL element is
// encountered, stop looking for draggable nodes and just use the
// original clicked node instead.
// XXXndeakin
// In the future, we will want to improve this so that XUL has a
// better way to specify whether something is draggable than just
// on/off.
dragContent = mGestureDownContent;
break;
}
// otherwise, it's not an HTML or XUL element, so just keep looking
}
dragContent = dragContent->GetParent();
}
}
// if no node in the hierarchy was found to drag, but the GetDragData method
// returned a node, use that returned node. Otherwise, nothing is draggable.
if (!dragContent && dragDataNode)
dragContent = dragDataNode;
if (dragContent) {
// if an ancestor node was used instead, clear the drag data
// XXXndeakin rework this a bit. Find a way to just not call GetDragData if we don't need to.
if (dragContent != originalDragContent)
aDataTransfer->ClearAll();
*aTargetNode = dragContent;
NS_ADDREF(*aTargetNode);
}
}
bool
EventStateManager::DoDefaultDragStart(nsPresContext* aPresContext,
WidgetDragEvent* aDragEvent,
DataTransfer* aDataTransfer,
nsIContent* aDragTarget,
nsISelection* aSelection)
{
nsCOMPtr<nsIDragService> dragService =
do_GetService("@mozilla.org/widget/dragservice;1");
if (!dragService)
return false;
// Default handling for the draggesture/dragstart event.
//
// First, check if a drag session already exists. This means that the drag
// service was called directly within a draggesture handler. In this case,
// don't do anything more, as it is assumed that the handler is managing
// drag and drop manually. Make sure to return true to indicate that a drag
// began.
nsCOMPtr<nsIDragSession> dragSession;
dragService->GetCurrentSession(getter_AddRefs(dragSession));
if (dragSession)
return true;
// No drag session is currently active, so check if a handler added
// any items to be dragged. If not, there isn't anything to drag.
uint32_t count = 0;
if (aDataTransfer)
aDataTransfer->GetMozItemCount(&count);
if (!count)
return false;
// Get the target being dragged, which may not be the same as the
// target of the mouse event. If one wasn't set in the
// aDataTransfer during the event handler, just use the original
// target instead.
nsCOMPtr<nsIContent> dragTarget = aDataTransfer->GetDragTarget();
if (!dragTarget) {
dragTarget = aDragTarget;
if (!dragTarget)
return false;
}
// check which drag effect should initially be used. If the effect was not
// set, just use all actions, otherwise Windows won't allow a drop.
uint32_t action;
aDataTransfer->GetEffectAllowedInt(&action);
if (action == nsIDragService::DRAGDROP_ACTION_UNINITIALIZED)
action = nsIDragService::DRAGDROP_ACTION_COPY |
nsIDragService::DRAGDROP_ACTION_MOVE |
nsIDragService::DRAGDROP_ACTION_LINK;
// get any custom drag image that was set
int32_t imageX, imageY;
Element* dragImage = aDataTransfer->GetDragImage(&imageX, &imageY);
nsCOMPtr<nsISupportsArray> transArray =
aDataTransfer->GetTransferables(dragTarget->AsDOMNode());
if (!transArray)
return false;
// XXXndeakin don't really want to create a new drag DOM event
// here, but we need something to pass to the InvokeDragSession
// methods.
nsCOMPtr<nsIDOMEvent> domEvent;
NS_NewDOMDragEvent(getter_AddRefs(domEvent), dragTarget,
aPresContext, aDragEvent);
nsCOMPtr<nsIDOMDragEvent> domDragEvent = do_QueryInterface(domEvent);
// if creating a drag event failed, starting a drag session will
// just fail.
// Use InvokeDragSessionWithSelection if a selection is being dragged,
// such that the image can be generated from the selected text. However,
// use InvokeDragSessionWithImage if a custom image was set or something
// other than a selection is being dragged.
if (!dragImage && aSelection) {
dragService->InvokeDragSessionWithSelection(aSelection, transArray,
action, domDragEvent,
aDataTransfer);
}
else {
// if dragging within a XUL tree and no custom drag image was
// set, the region argument to InvokeDragSessionWithImage needs
// to be set to the area encompassing the selected rows of the
// tree to ensure that the drag feedback gets clipped to those
// rows. For other content, region should be null.
nsCOMPtr<nsIScriptableRegion> region;
#ifdef MOZ_XUL
if (dragTarget && !dragImage) {
if (dragTarget->NodeInfo()->Equals(nsGkAtoms::treechildren,
kNameSpaceID_XUL)) {
nsTreeBodyFrame* treeBody =
do_QueryFrame(dragTarget->GetPrimaryFrame());
if (treeBody) {
treeBody->GetSelectionRegion(getter_AddRefs(region));
}
}
}
#endif
dragService->InvokeDragSessionWithImage(dragTarget->AsDOMNode(), transArray,
region, action,
dragImage ? dragImage->AsDOMNode() :
nullptr,
imageX,
imageY, domDragEvent,
aDataTransfer);
}
return true;
}
nsresult
EventStateManager::GetContentViewer(nsIContentViewer** aCv)
{
*aCv = nullptr;
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if(!fm) return NS_ERROR_FAILURE;
nsCOMPtr<nsIDOMWindow> focusedWindow;
fm->GetFocusedWindow(getter_AddRefs(focusedWindow));
nsCOMPtr<nsPIDOMWindow> ourWindow = do_QueryInterface(focusedWindow);
if(!ourWindow) return NS_ERROR_FAILURE;
nsIDOMWindow *rootWindow = ourWindow->GetPrivateRoot();
if(!rootWindow) return NS_ERROR_FAILURE;
nsCOMPtr<nsIDOMWindow> contentWindow;
rootWindow->GetContent(getter_AddRefs(contentWindow));
if(!contentWindow) return NS_ERROR_FAILURE;
nsIDocument *doc = GetDocumentFromWindow(contentWindow);
if(!doc) return NS_ERROR_FAILURE;
nsIPresShell *presShell = doc->GetShell();
if(!presShell) return NS_ERROR_FAILURE;
nsPresContext *presContext = presShell->GetPresContext();
if(!presContext) return NS_ERROR_FAILURE;
nsCOMPtr<nsIDocShell> docshell(presContext->GetDocShell());
if(!docshell) return NS_ERROR_FAILURE;
docshell->GetContentViewer(aCv);
if(!*aCv) return NS_ERROR_FAILURE;
return NS_OK;
}
nsresult
EventStateManager::ChangeTextSize(int32_t change)
{
nsCOMPtr<nsIContentViewer> cv;
nsresult rv = GetContentViewer(getter_AddRefs(cv));
NS_ENSURE_SUCCESS(rv, rv);
float textzoom;
float zoomMin = ((float)Preferences::GetInt("zoom.minPercent", 50)) / 100;
float zoomMax = ((float)Preferences::GetInt("zoom.maxPercent", 300)) / 100;
cv->GetTextZoom(&textzoom);
textzoom += ((float)change) / 10;
if (textzoom < zoomMin)
textzoom = zoomMin;
else if (textzoom > zoomMax)
textzoom = zoomMax;
cv->SetTextZoom(textzoom);
return NS_OK;
}
nsresult
EventStateManager::ChangeFullZoom(int32_t change)
{
nsCOMPtr<nsIContentViewer> cv;
nsresult rv = GetContentViewer(getter_AddRefs(cv));
NS_ENSURE_SUCCESS(rv, rv);
float fullzoom;
float zoomMin = ((float)Preferences::GetInt("zoom.minPercent", 50)) / 100;
float zoomMax = ((float)Preferences::GetInt("zoom.maxPercent", 300)) / 100;
cv->GetFullZoom(&fullzoom);
fullzoom += ((float)change) / 10;
if (fullzoom < zoomMin)
fullzoom = zoomMin;
else if (fullzoom > zoomMax)
fullzoom = zoomMax;
cv->SetFullZoom(fullzoom);
return NS_OK;
}
void
EventStateManager::DoScrollHistory(int32_t direction)
{
nsCOMPtr<nsISupports> pcContainer(mPresContext->GetContainerWeak());
if (pcContainer) {
nsCOMPtr<nsIWebNavigation> webNav(do_QueryInterface(pcContainer));
if (webNav) {
// positive direction to go back one step, nonpositive to go forward
if (direction > 0)
webNav->GoBack();
else
webNav->GoForward();
}
}
}
void
EventStateManager::DoScrollZoom(nsIFrame* aTargetFrame,
int32_t adjustment)
{
// Exclude form controls and content in chrome docshells.
nsIContent *content = aTargetFrame->GetContent();
if (content &&
!content->IsNodeOfType(nsINode::eHTML_FORM_CONTROL) &&
!nsContentUtils::IsInChromeDocshell(content->OwnerDoc()))
{
// positive adjustment to decrease zoom, negative to increase
int32_t change = (adjustment > 0) ? -1 : 1;
if (Preferences::GetBool("browser.zoom.full") || content->OwnerDoc()->IsSyntheticDocument()) {
ChangeFullZoom(change);
} else {
ChangeTextSize(change);
}
EnsureDocument(mPresContext);
nsContentUtils::DispatchChromeEvent(mDocument, static_cast<nsIDocument*>(mDocument),
NS_LITERAL_STRING("ZoomChangeUsingMouseWheel"),
true, true);
}
}
static nsIFrame*
GetParentFrameToScroll(nsIFrame* aFrame)
{
if (!aFrame)
return nullptr;
if (aFrame->StyleDisplay()->mPosition == NS_STYLE_POSITION_FIXED &&
nsLayoutUtils::IsReallyFixedPos(aFrame))
return aFrame->PresContext()->GetPresShell()->GetRootScrollFrame();
return aFrame->GetParent();
}
/*static*/ bool
EventStateManager::CanVerticallyScrollFrameWithWheel(nsIFrame* aFrame)
{
nsIContent* c = aFrame->GetContent();
if (!c) {
return true;
}
nsCOMPtr<nsITextControlElement> ctrl =
do_QueryInterface(c->IsInAnonymousSubtree() ? c->GetBindingParent() : c);
if (ctrl && ctrl->IsSingleLineTextControl()) {
return false;
}
return true;
}
void
EventStateManager::DispatchLegacyMouseScrollEvents(nsIFrame* aTargetFrame,
WidgetWheelEvent* aEvent,
nsEventStatus* aStatus)
{
MOZ_ASSERT(aEvent);
MOZ_ASSERT(aStatus);
if (!aTargetFrame || *aStatus == nsEventStatus_eConsumeNoDefault) {
return;
}
// Ignore mouse wheel transaction for computing legacy mouse wheel
// events' delta value.
nsIScrollableFrame* scrollTarget =
ComputeScrollTarget(aTargetFrame, aEvent,
COMPUTE_LEGACY_MOUSE_SCROLL_EVENT_TARGET);
nsIFrame* scrollFrame = do_QueryFrame(scrollTarget);
nsPresContext* pc =
scrollFrame ? scrollFrame->PresContext() : aTargetFrame->PresContext();
// DOM event's delta vales are computed from CSS pixels.
nsSize scrollAmount = GetScrollAmount(pc, aEvent, scrollTarget);
nsIntSize scrollAmountInCSSPixels(
nsPresContext::AppUnitsToIntCSSPixels(scrollAmount.width),
nsPresContext::AppUnitsToIntCSSPixels(scrollAmount.height));
// XXX We don't deal with fractional amount in legacy event, though the
// default action handler (DoScrollText()) deals with it.
// If we implemented such strict computation, we would need additional
// accumulated delta values. It would made the code more complicated.
// And also it would computes different delta values from older version.
// It doesn't make sense to implement such code for legacy events and
// rare cases.
int32_t scrollDeltaX, scrollDeltaY, pixelDeltaX, pixelDeltaY;
switch (aEvent->deltaMode) {
case nsIDOMWheelEvent::DOM_DELTA_PAGE:
scrollDeltaX =
!aEvent->lineOrPageDeltaX ? 0 :
(aEvent->lineOrPageDeltaX > 0 ? nsIDOMUIEvent::SCROLL_PAGE_DOWN :
nsIDOMUIEvent::SCROLL_PAGE_UP);
scrollDeltaY =
!aEvent->lineOrPageDeltaY ? 0 :
(aEvent->lineOrPageDeltaY > 0 ? nsIDOMUIEvent::SCROLL_PAGE_DOWN :
nsIDOMUIEvent::SCROLL_PAGE_UP);
pixelDeltaX = RoundDown(aEvent->deltaX * scrollAmountInCSSPixels.width);
pixelDeltaY = RoundDown(aEvent->deltaY * scrollAmountInCSSPixels.height);
break;
case nsIDOMWheelEvent::DOM_DELTA_LINE:
scrollDeltaX = aEvent->lineOrPageDeltaX;
scrollDeltaY = aEvent->lineOrPageDeltaY;
pixelDeltaX = RoundDown(aEvent->deltaX * scrollAmountInCSSPixels.width);
pixelDeltaY = RoundDown(aEvent->deltaY * scrollAmountInCSSPixels.height);
break;
case nsIDOMWheelEvent::DOM_DELTA_PIXEL:
scrollDeltaX = aEvent->lineOrPageDeltaX;
scrollDeltaY = aEvent->lineOrPageDeltaY;
pixelDeltaX = RoundDown(aEvent->deltaX);
pixelDeltaY = RoundDown(aEvent->deltaY);
break;
default:
MOZ_CRASH("Invalid deltaMode value comes");
}
// Send the legacy events in following order:
// 1. Vertical scroll
// 2. Vertical pixel scroll (even if #1 isn't consumed)
// 3. Horizontal scroll (even if #1 and/or #2 are consumed)
// 4. Horizontal pixel scroll (even if #3 isn't consumed)
nsWeakFrame targetFrame(aTargetFrame);
MOZ_ASSERT(*aStatus != nsEventStatus_eConsumeNoDefault &&
!aEvent->mFlags.mDefaultPrevented,
"If you make legacy events dispatched for default prevented wheel "
"event, you need to initialize stateX and stateY");
EventState stateX, stateY;
if (scrollDeltaY) {
SendLineScrollEvent(aTargetFrame, aEvent, stateY,
scrollDeltaY, DELTA_DIRECTION_Y);
if (!targetFrame.IsAlive()) {
*aStatus = nsEventStatus_eConsumeNoDefault;
return;
}
}
if (pixelDeltaY) {
SendPixelScrollEvent(aTargetFrame, aEvent, stateY,
pixelDeltaY, DELTA_DIRECTION_Y);
if (!targetFrame.IsAlive()) {
*aStatus = nsEventStatus_eConsumeNoDefault;
return;
}
}
if (scrollDeltaX) {
SendLineScrollEvent(aTargetFrame, aEvent, stateX,
scrollDeltaX, DELTA_DIRECTION_X);
if (!targetFrame.IsAlive()) {
*aStatus = nsEventStatus_eConsumeNoDefault;
return;
}
}
if (pixelDeltaX) {
SendPixelScrollEvent(aTargetFrame, aEvent, stateX,
pixelDeltaX, DELTA_DIRECTION_X);
if (!targetFrame.IsAlive()) {
*aStatus = nsEventStatus_eConsumeNoDefault;
return;
}
}
if (stateY.mDefaultPrevented || stateX.mDefaultPrevented) {
*aStatus = nsEventStatus_eConsumeNoDefault;
aEvent->mFlags.mDefaultPrevented = true;
aEvent->mFlags.mDefaultPreventedByContent |=
stateY.mDefaultPreventedByContent || stateX.mDefaultPreventedByContent;
}
}
void
EventStateManager::SendLineScrollEvent(nsIFrame* aTargetFrame,
WidgetWheelEvent* aEvent,
EventState& aState,
int32_t aDelta,
DeltaDirection aDeltaDirection)
{
nsCOMPtr<nsIContent> targetContent = aTargetFrame->GetContent();
if (!targetContent)
targetContent = GetFocusedContent();
if (!targetContent)
return;
while (targetContent->IsNodeOfType(nsINode::eTEXT)) {
targetContent = targetContent->GetParent();
}
WidgetMouseScrollEvent event(aEvent->mFlags.mIsTrusted, NS_MOUSE_SCROLL,
aEvent->widget);
event.mFlags.mDefaultPrevented = aState.mDefaultPrevented;
event.mFlags.mDefaultPreventedByContent = aState.mDefaultPreventedByContent;
event.refPoint = aEvent->refPoint;
event.widget = aEvent->widget;
event.time = aEvent->time;
event.timeStamp = aEvent->timeStamp;
event.modifiers = aEvent->modifiers;
event.buttons = aEvent->buttons;
event.isHorizontal = (aDeltaDirection == DELTA_DIRECTION_X);
event.delta = aDelta;
event.inputSource = aEvent->inputSource;
nsEventStatus status = nsEventStatus_eIgnore;
EventDispatcher::Dispatch(targetContent, aTargetFrame->PresContext(),
&event, nullptr, &status);
aState.mDefaultPrevented =
event.mFlags.mDefaultPrevented || status == nsEventStatus_eConsumeNoDefault;
aState.mDefaultPreventedByContent = event.mFlags.mDefaultPreventedByContent;
}
void
EventStateManager::SendPixelScrollEvent(nsIFrame* aTargetFrame,
WidgetWheelEvent* aEvent,
EventState& aState,
int32_t aPixelDelta,
DeltaDirection aDeltaDirection)
{
nsCOMPtr<nsIContent> targetContent = aTargetFrame->GetContent();
if (!targetContent) {
targetContent = GetFocusedContent();
if (!targetContent)
return;
}
while (targetContent->IsNodeOfType(nsINode::eTEXT)) {
targetContent = targetContent->GetParent();
}
WidgetMouseScrollEvent event(aEvent->mFlags.mIsTrusted, NS_MOUSE_PIXEL_SCROLL,
aEvent->widget);
event.mFlags.mDefaultPrevented = aState.mDefaultPrevented;
event.mFlags.mDefaultPreventedByContent = aState.mDefaultPreventedByContent;
event.refPoint = aEvent->refPoint;
event.widget = aEvent->widget;
event.time = aEvent->time;
event.timeStamp = aEvent->timeStamp;
event.modifiers = aEvent->modifiers;
event.buttons = aEvent->buttons;
event.isHorizontal = (aDeltaDirection == DELTA_DIRECTION_X);
event.delta = aPixelDelta;
event.inputSource = aEvent->inputSource;
nsEventStatus status = nsEventStatus_eIgnore;
EventDispatcher::Dispatch(targetContent, aTargetFrame->PresContext(),
&event, nullptr, &status);
aState.mDefaultPrevented =
event.mFlags.mDefaultPrevented || status == nsEventStatus_eConsumeNoDefault;
aState.mDefaultPreventedByContent = event.mFlags.mDefaultPreventedByContent;
}
nsIScrollableFrame*
EventStateManager::ComputeScrollTarget(nsIFrame* aTargetFrame,
WidgetWheelEvent* aEvent,
ComputeScrollTargetOptions aOptions)
{
return ComputeScrollTarget(aTargetFrame, aEvent->deltaX, aEvent->deltaY,
aEvent, aOptions);
}
// Overload ComputeScrollTarget method to allow passing "test" dx and dy when looking
// for which scrollbarmediators to activate when two finger down on trackpad
// and before any actual motion
nsIScrollableFrame*
EventStateManager::ComputeScrollTarget(nsIFrame* aTargetFrame,
double aDirectionX,
double aDirectionY,
WidgetWheelEvent* aEvent,
ComputeScrollTargetOptions aOptions)
{
if (aOptions & PREFER_MOUSE_WHEEL_TRANSACTION) {
// If the user recently scrolled with the mousewheel, then they probably
// want to scroll the same view as before instead of the view under the
// cursor. WheelTransaction tracks the frame currently being
// scrolled with the mousewheel. We consider the transaction ended when the
// mouse moves more than "mousewheel.transaction.ignoremovedelay"
// milliseconds after the last scroll operation, or any time the mouse moves
// out of the frame, or when more than "mousewheel.transaction.timeout"
// milliseconds have passed after the last operation, even if the mouse
// hasn't moved.
nsIFrame* lastScrollFrame = WheelTransaction::GetTargetFrame();
if (lastScrollFrame) {
nsIScrollableFrame* frameToScroll =
lastScrollFrame->GetScrollTargetFrame();
if (frameToScroll) {
return frameToScroll;
}
}
}
// If the event doesn't cause scroll actually, we cannot find scroll target
// because we check if the event can cause scroll actually on each found
// scrollable frame.
if (!aDirectionX && !aDirectionY) {
return nullptr;
}
bool checkIfScrollableX =
aDirectionX && (aOptions & PREFER_ACTUAL_SCROLLABLE_TARGET_ALONG_X_AXIS);
bool checkIfScrollableY =
aDirectionY && (aOptions & PREFER_ACTUAL_SCROLLABLE_TARGET_ALONG_Y_AXIS);
nsIScrollableFrame* frameToScroll = nullptr;
nsIFrame* scrollFrame =
!(aOptions & START_FROM_PARENT) ? aTargetFrame :
GetParentFrameToScroll(aTargetFrame);
for (; scrollFrame; scrollFrame = GetParentFrameToScroll(scrollFrame)) {
// Check whether the frame wants to provide us with a scrollable view.
frameToScroll = scrollFrame->GetScrollTargetFrame();
if (!frameToScroll) {
continue;
}
// Don't scroll vertically by mouse-wheel on a single-line text control.
if (checkIfScrollableY) {
if (!CanVerticallyScrollFrameWithWheel(scrollFrame)) {
continue;
}
}
if (!checkIfScrollableX && !checkIfScrollableY) {
return frameToScroll;
}
ScrollbarStyles ss = frameToScroll->GetScrollbarStyles();
bool hiddenForV = (NS_STYLE_OVERFLOW_HIDDEN == ss.mVertical);
bool hiddenForH = (NS_STYLE_OVERFLOW_HIDDEN == ss.mHorizontal);
if ((hiddenForV && hiddenForH) ||
(checkIfScrollableY && !checkIfScrollableX && hiddenForV) ||
(checkIfScrollableX && !checkIfScrollableY && hiddenForH)) {
continue;
}
// For default action, we should climb up the tree if cannot scroll it
// by the event actually.
bool canScroll =
WheelHandlingUtils::CanScrollOn(frameToScroll, aDirectionX, aDirectionY);
// Comboboxes need special care.
nsIComboboxControlFrame* comboBox = do_QueryFrame(scrollFrame);
if (comboBox) {
if (comboBox->IsDroppedDown()) {
// Don't propagate to parent when drop down menu is active.
return canScroll ? frameToScroll : nullptr;
}
// Always propagate when not dropped down (even if focused).
continue;
}
if (canScroll) {
return frameToScroll;
}
}
nsIFrame* newFrame = nsLayoutUtils::GetCrossDocParentFrame(
aTargetFrame->PresContext()->FrameManager()->GetRootFrame());
aOptions =
static_cast<ComputeScrollTargetOptions>(aOptions & ~START_FROM_PARENT);
return newFrame ? ComputeScrollTarget(newFrame, aEvent, aOptions) : nullptr;
}
nsSize
EventStateManager::GetScrollAmount(nsPresContext* aPresContext,
WidgetWheelEvent* aEvent,
nsIScrollableFrame* aScrollableFrame)
{
MOZ_ASSERT(aPresContext);
MOZ_ASSERT(aEvent);
bool isPage = (aEvent->deltaMode == nsIDOMWheelEvent::DOM_DELTA_PAGE);
if (aScrollableFrame) {
return isPage ? aScrollableFrame->GetPageScrollAmount() :
aScrollableFrame->GetLineScrollAmount();
}
// If there is no scrollable frame and page scrolling, use view port size.
if (isPage) {
return aPresContext->GetVisibleArea().Size();
}
// If there is no scrollable frame, we should use root frame's information.
nsIFrame* rootFrame = aPresContext->PresShell()->GetRootFrame();
if (!rootFrame) {
return nsSize(0, 0);
}
nsRefPtr<nsFontMetrics> fm;
nsLayoutUtils::GetFontMetricsForFrame(rootFrame, getter_AddRefs(fm),
nsLayoutUtils::FontSizeInflationFor(rootFrame));
NS_ENSURE_TRUE(fm, nsSize(0, 0));
return nsSize(fm->AveCharWidth(), fm->MaxHeight());
}
void
EventStateManager::DoScrollText(nsIScrollableFrame* aScrollableFrame,
WidgetWheelEvent* aEvent)
{
MOZ_ASSERT(aScrollableFrame);
MOZ_ASSERT(aEvent);
nsIFrame* scrollFrame = do_QueryFrame(aScrollableFrame);
MOZ_ASSERT(scrollFrame);
nsWeakFrame scrollFrameWeak(scrollFrame);
nsIFrame* lastScrollFrame = WheelTransaction::GetTargetFrame();
if (!lastScrollFrame) {
WheelTransaction::BeginTransaction(scrollFrame, aEvent);
} else if (lastScrollFrame != scrollFrame) {
WheelTransaction::EndTransaction();
WheelTransaction::BeginTransaction(scrollFrame, aEvent);
} else {
WheelTransaction::UpdateTransaction(aEvent);
}
// When the scroll event will not scroll any views, UpdateTransaction
// fired MozMouseScrollFailed event which is for automated testing.
// In the event handler, the target frame might be destroyed. Then,
// we should not try scrolling anything.
if (!scrollFrameWeak.IsAlive()) {
WheelTransaction::EndTransaction();
return;
}
// Default action's actual scroll amount should be computed from device
// pixels.
nsPresContext* pc = scrollFrame->PresContext();
nsSize scrollAmount = GetScrollAmount(pc, aEvent, aScrollableFrame);
nsIntSize scrollAmountInDevPixels(
pc->AppUnitsToDevPixels(scrollAmount.width),
pc->AppUnitsToDevPixels(scrollAmount.height));
nsIntPoint actualDevPixelScrollAmount =
DeltaAccumulator::GetInstance()->
ComputeScrollAmountForDefaultAction(aEvent, scrollAmountInDevPixels);
// Don't scroll around the axis whose overflow style is hidden.
ScrollbarStyles overflowStyle = aScrollableFrame->GetScrollbarStyles();
if (overflowStyle.mHorizontal == NS_STYLE_OVERFLOW_HIDDEN) {
actualDevPixelScrollAmount.x = 0;
}
if (overflowStyle.mVertical == NS_STYLE_OVERFLOW_HIDDEN) {
actualDevPixelScrollAmount.y = 0;
}
nsIScrollbarMediator::ScrollSnapMode snapMode = nsIScrollbarMediator::DISABLE_SNAP;
nsIAtom* origin = nullptr;
switch (aEvent->deltaMode) {
case nsIDOMWheelEvent::DOM_DELTA_LINE:
origin = nsGkAtoms::mouseWheel;
snapMode = nsIScrollableFrame::ENABLE_SNAP;
break;
case nsIDOMWheelEvent::DOM_DELTA_PAGE:
origin = nsGkAtoms::pages;
snapMode = nsIScrollableFrame::ENABLE_SNAP;
break;
case nsIDOMWheelEvent::DOM_DELTA_PIXEL:
origin = nsGkAtoms::pixels;
break;
default:
MOZ_CRASH("Invalid deltaMode value comes");
}
// We shouldn't scroll more one page at once except when over one page scroll
// is allowed for the event.
nsSize pageSize = aScrollableFrame->GetPageScrollAmount();
nsIntSize devPixelPageSize(pc->AppUnitsToDevPixels(pageSize.width),
pc->AppUnitsToDevPixels(pageSize.height));
if (!WheelPrefs::GetInstance()->IsOverOnePageScrollAllowedX(aEvent) &&
DeprecatedAbs(actualDevPixelScrollAmount.x) > devPixelPageSize.width) {
actualDevPixelScrollAmount.x =
(actualDevPixelScrollAmount.x >= 0) ? devPixelPageSize.width :
-devPixelPageSize.width;
}
if (!WheelPrefs::GetInstance()->IsOverOnePageScrollAllowedY(aEvent) &&
DeprecatedAbs(actualDevPixelScrollAmount.y) > devPixelPageSize.height) {
actualDevPixelScrollAmount.y =
(actualDevPixelScrollAmount.y >= 0) ? devPixelPageSize.height :
-devPixelPageSize.height;
}
bool isDeltaModePixel =
(aEvent->deltaMode == nsIDOMWheelEvent::DOM_DELTA_PIXEL);
nsIScrollableFrame::ScrollMode mode;
switch (aEvent->scrollType) {
case WidgetWheelEvent::SCROLL_DEFAULT:
if (isDeltaModePixel) {
mode = nsIScrollableFrame::NORMAL;
} else {
mode = nsIScrollableFrame::SMOOTH;
}
break;
case WidgetWheelEvent::SCROLL_SYNCHRONOUSLY:
mode = nsIScrollableFrame::INSTANT;
break;
case WidgetWheelEvent::SCROLL_ASYNCHRONOUSELY:
mode = nsIScrollableFrame::NORMAL;
break;
case WidgetWheelEvent::SCROLL_SMOOTHLY:
mode = nsIScrollableFrame::SMOOTH;
break;
default:
MOZ_CRASH("Invalid scrollType value comes");
}
nsIScrollableFrame::ScrollMomentum momentum =
aEvent->isMomentum ? nsIScrollableFrame::SYNTHESIZED_MOMENTUM_EVENT
: nsIScrollableFrame::NOT_MOMENTUM;
nsIntPoint overflow;
aScrollableFrame->ScrollBy(actualDevPixelScrollAmount,
nsIScrollableFrame::DEVICE_PIXELS,
mode, &overflow, origin, momentum, snapMode);
if (!scrollFrameWeak.IsAlive()) {
// If the scroll causes changing the layout, we can think that the event
// has been completely consumed by the content. Then, users probably don't
// want additional action.
aEvent->overflowDeltaX = aEvent->overflowDeltaY = 0;
} else if (isDeltaModePixel) {
aEvent->overflowDeltaX = overflow.x;
aEvent->overflowDeltaY = overflow.y;
} else {
aEvent->overflowDeltaX =
static_cast<double>(overflow.x) / scrollAmountInDevPixels.width;
aEvent->overflowDeltaY =
static_cast<double>(overflow.y) / scrollAmountInDevPixels.height;
}
// If CSS overflow properties caused not to scroll, the overflowDelta* values
// should be same as delta* values since they may be used as gesture event by
// widget. However, if there is another scrollable element in the ancestor
// along the axis, probably users don't want the operation to cause
// additional action such as moving history. In such case, overflowDelta
// values should stay zero.
if (scrollFrameWeak.IsAlive()) {
if (aEvent->deltaX &&
overflowStyle.mHorizontal == NS_STYLE_OVERFLOW_HIDDEN &&
!ComputeScrollTarget(scrollFrame, aEvent,
COMPUTE_SCROLLABLE_ANCESTOR_ALONG_X_AXIS)) {
aEvent->overflowDeltaX = aEvent->deltaX;
}
if (aEvent->deltaY &&
overflowStyle.mVertical == NS_STYLE_OVERFLOW_HIDDEN &&
!ComputeScrollTarget(scrollFrame, aEvent,
COMPUTE_SCROLLABLE_ANCESTOR_ALONG_Y_AXIS)) {
aEvent->overflowDeltaY = aEvent->deltaY;
}
}
NS_ASSERTION(aEvent->overflowDeltaX == 0 ||
(aEvent->overflowDeltaX > 0) == (aEvent->deltaX > 0),
"The sign of overflowDeltaX is different from the scroll direction");
NS_ASSERTION(aEvent->overflowDeltaY == 0 ||
(aEvent->overflowDeltaY > 0) == (aEvent->deltaY > 0),
"The sign of overflowDeltaY is different from the scroll direction");
WheelPrefs::GetInstance()->CancelApplyingUserPrefsFromOverflowDelta(aEvent);
}
void
EventStateManager::DecideGestureEvent(WidgetGestureNotifyEvent* aEvent,
nsIFrame* targetFrame)
{
NS_ASSERTION(aEvent->message == NS_GESTURENOTIFY_EVENT_START,
"DecideGestureEvent called with a non-gesture event");
/* Check the ancestor tree to decide if any frame is willing* to receive
* a MozPixelScroll event. If that's the case, the current touch gesture
* will be used as a pan gesture; otherwise it will be a regular
* mousedown/mousemove/click event.
*
* *willing: determine if it makes sense to pan the element using scroll events:
* - For web content: if there are any visible scrollbars on the touch point
* - For XUL: if it's an scrollable element that can currently scroll in some
* direction.
*
* Note: we'll have to one-off various cases to ensure a good usable behavior
*/
WidgetGestureNotifyEvent::ePanDirection panDirection =
WidgetGestureNotifyEvent::ePanNone;
bool displayPanFeedback = false;
for (nsIFrame* current = targetFrame; current;
current = nsLayoutUtils::GetCrossDocParentFrame(current)) {
// e10s - mark remote content as pannable. This is a work around since
// we don't have access to remote frame scroll info here. Apz data may
// assist is solving this.
if (current && IsRemoteTarget(current->GetContent())) {
panDirection = WidgetGestureNotifyEvent::ePanBoth;
// We don't know when we reach bounds, so just disable feedback for now.
displayPanFeedback = false;
break;
}
nsIAtom* currentFrameType = current->GetType();
// Scrollbars should always be draggable
if (currentFrameType == nsGkAtoms::scrollbarFrame) {
panDirection = WidgetGestureNotifyEvent::ePanNone;
break;
}
#ifdef MOZ_XUL
// Special check for trees
nsTreeBodyFrame* treeFrame = do_QueryFrame(current);
if (treeFrame) {
if (treeFrame->GetHorizontalOverflow()) {
panDirection = WidgetGestureNotifyEvent::ePanHorizontal;
}
if (treeFrame->GetVerticalOverflow()) {
panDirection = WidgetGestureNotifyEvent::ePanVertical;
}
break;
}
#endif
nsIScrollableFrame* scrollableFrame = do_QueryFrame(current);
if (scrollableFrame) {
if (current->IsFrameOfType(nsIFrame::eXULBox)) {
displayPanFeedback = true;
nsRect scrollRange = scrollableFrame->GetScrollRange();
bool canScrollHorizontally = scrollRange.width > 0;
if (targetFrame->GetType() == nsGkAtoms::menuFrame) {
// menu frames report horizontal scroll when they have submenus
// and we don't want that
canScrollHorizontally = false;
displayPanFeedback = false;
}
// Vertical panning has priority over horizontal panning, so
// when vertical movement is possible we can just finish the loop.
if (scrollRange.height > 0) {
panDirection = WidgetGestureNotifyEvent::ePanVertical;
break;
}
if (canScrollHorizontally) {
panDirection = WidgetGestureNotifyEvent::ePanHorizontal;
displayPanFeedback = false;
}
} else { //Not a XUL box
uint32_t scrollbarVisibility = scrollableFrame->GetScrollbarVisibility();
//Check if we have visible scrollbars
if (scrollbarVisibility & nsIScrollableFrame::VERTICAL) {
panDirection = WidgetGestureNotifyEvent::ePanVertical;
displayPanFeedback = true;
break;
}
if (scrollbarVisibility & nsIScrollableFrame::HORIZONTAL) {
panDirection = WidgetGestureNotifyEvent::ePanHorizontal;
displayPanFeedback = true;
}
}
} //scrollableFrame
} //ancestor chain
aEvent->displayPanFeedback = displayPanFeedback;
aEvent->panDirection = panDirection;
}
#ifdef XP_MACOSX
static bool
NodeAllowsClickThrough(nsINode* aNode)
{
while (aNode) {
if (aNode->IsXULElement()) {
mozilla::dom::Element* element = aNode->AsElement();
static nsIContent::AttrValuesArray strings[] =
{&nsGkAtoms::always, &nsGkAtoms::never, nullptr};
switch (element->FindAttrValueIn(kNameSpaceID_None, nsGkAtoms::clickthrough,
strings, eCaseMatters)) {
case 0:
return true;
case 1:
return false;
}
}
aNode = nsContentUtils::GetCrossDocParentNode(aNode);
}
return true;
}
#endif
void
EventStateManager::PostHandleKeyboardEvent(WidgetKeyboardEvent* aKeyboardEvent,
nsEventStatus& aStatus,
bool dispatchedToContentProcess)
{
if (aStatus == nsEventStatus_eConsumeNoDefault) {
return;
}
// XXX Currently, our automated tests don't support mKeyNameIndex.
// Therefore, we still need to handle this with keyCode.
switch(aKeyboardEvent->keyCode) {
case NS_VK_TAB:
case NS_VK_F6:
// This is to prevent keyboard scrolling while alt modifier in use.
if (!aKeyboardEvent->IsAlt()) {
aStatus = nsEventStatus_eConsumeNoDefault;
// Handling the tab event after it was sent to content is bad,
// because to the FocusManager the remote-browser looks like one
// element, so we would just move the focus to the next element
// in chrome, instead of handling it in content.
if (dispatchedToContentProcess)
break;
EnsureDocument(mPresContext);
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm && mDocument) {
// Shift focus forward or back depending on shift key
bool isDocMove =
aKeyboardEvent->IsControl() || aKeyboardEvent->keyCode == NS_VK_F6;
uint32_t dir = aKeyboardEvent->IsShift() ?
(isDocMove ? static_cast<uint32_t>(nsIFocusManager::MOVEFOCUS_BACKWARDDOC) :
static_cast<uint32_t>(nsIFocusManager::MOVEFOCUS_BACKWARD)) :
(isDocMove ? static_cast<uint32_t>(nsIFocusManager::MOVEFOCUS_FORWARDDOC) :
static_cast<uint32_t>(nsIFocusManager::MOVEFOCUS_FORWARD));
nsCOMPtr<nsIDOMElement> result;
fm->MoveFocus(mDocument->GetWindow(), nullptr, dir,
nsIFocusManager::FLAG_BYKEY,
getter_AddRefs(result));
}
}
return;
case 0:
// We handle keys with no specific keycode value below.
break;
default:
return;
}
switch(aKeyboardEvent->mKeyNameIndex) {
case KEY_NAME_INDEX_ZoomIn:
case KEY_NAME_INDEX_ZoomOut:
ChangeFullZoom(
aKeyboardEvent->mKeyNameIndex == KEY_NAME_INDEX_ZoomIn ? 1 : -1);
aStatus = nsEventStatus_eConsumeNoDefault;
break;
default:
break;
}
}
nsresult
EventStateManager::PostHandleEvent(nsPresContext* aPresContext,
WidgetEvent* aEvent,
nsIFrame* aTargetFrame,
nsEventStatus* aStatus)
{
NS_ENSURE_ARG(aPresContext);
NS_ENSURE_ARG_POINTER(aStatus);
bool dispatchedToContentProcess = HandleCrossProcessEvent(aEvent,
aStatus);
mCurrentTarget = aTargetFrame;
mCurrentTargetContent = nullptr;
// Most of the events we handle below require a frame.
// Add special cases here.
if (!mCurrentTarget && aEvent->message != NS_MOUSE_BUTTON_UP &&
aEvent->message != NS_MOUSE_BUTTON_DOWN) {
return NS_OK;
}
//Keep the prescontext alive, we might need it after event dispatch
nsRefPtr<nsPresContext> presContext = aPresContext;
nsresult ret = NS_OK;
switch (aEvent->message) {
case NS_MOUSE_BUTTON_DOWN:
{
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
if (mouseEvent->button == WidgetMouseEvent::eLeftButton &&
!sNormalLMouseEventInProcess) {
// We got a mouseup event while a mousedown event was being processed.
// Make sure that the capturing content is cleared.
nsIPresShell::SetCapturingContent(nullptr, 0);
break;
}
// For remote content, capture the event in the parent process at the
// <xul:browser remote> element. This will ensure that subsequent mousemove/mouseup
// events will continue to be dispatched to this element and therefore forwarded
// to the child.
if (dispatchedToContentProcess && !nsIPresShell::GetCapturingContent()) {
nsIContent* content = mCurrentTarget ? mCurrentTarget->GetContent() : nullptr;
nsIPresShell::SetCapturingContent(content, 0);
}
nsCOMPtr<nsIContent> activeContent;
if (nsEventStatus_eConsumeNoDefault != *aStatus) {
nsCOMPtr<nsIContent> newFocus;
bool suppressBlur = false;
if (mCurrentTarget) {
mCurrentTarget->GetContentForEvent(aEvent, getter_AddRefs(newFocus));
const nsStyleUserInterface* ui = mCurrentTarget->StyleUserInterface();
activeContent = mCurrentTarget->GetContent();
// In some cases, we do not want to even blur the current focused
// element. Those cases are:
// 1. -moz-user-focus CSS property is set to 'ignore';
// 2. Element with NS_EVENT_STATE_DISABLED
// (aka :disabled pseudo-class for HTML element);
// 3. XUL control element has the disabled property set to 'true'.
//
// We can't use nsIFrame::IsFocusable() because we want to blur when
// we click on a visibility: none element.
// We can't use nsIContent::IsFocusable() because we want to blur when
// we click on a non-focusable element like a <div>.
// We have to use |aEvent->target| to not make sure we do not check an
// anonymous node of the targeted element.
suppressBlur = (ui->mUserFocus == NS_STYLE_USER_FOCUS_IGNORE);
if (!suppressBlur) {
nsCOMPtr<Element> element = do_QueryInterface(aEvent->target);
suppressBlur = element &&
element->State().HasState(NS_EVENT_STATE_DISABLED);
}
if (!suppressBlur) {
nsCOMPtr<nsIDOMXULControlElement> xulControl =
do_QueryInterface(aEvent->target);
if (xulControl) {
bool disabled;
xulControl->GetDisabled(&disabled);
suppressBlur = disabled;
}
}
}
if (!suppressBlur) {
suppressBlur = nsContentUtils::IsUserFocusIgnored(activeContent);
}
nsIFrame* currFrame = mCurrentTarget;
// When a root content which isn't editable but has an editable HTML
// <body> element is clicked, we should redirect the focus to the
// the <body> element. E.g., when an user click bottom of the editor
// where is outside of the <body> element, the <body> should be focused
// and the user can edit immediately after that.
//
// NOTE: The newFocus isn't editable that also means it's not in
// designMode. In designMode, all contents are not focusable.
if (newFocus && !newFocus->IsEditable()) {
nsIDocument *doc = newFocus->GetCrossShadowCurrentDoc();
if (doc && newFocus == doc->GetRootElement()) {
nsIContent *bodyContent =
nsLayoutUtils::GetEditableRootContentByContentEditable(doc);
if (bodyContent) {
nsIFrame* bodyFrame = bodyContent->GetPrimaryFrame();
if (bodyFrame) {
currFrame = bodyFrame;
newFocus = bodyContent;
}
}
}
}
// When the mouse is pressed, the default action is to focus the
// target. Look for the nearest enclosing focusable frame.
while (currFrame) {
// If the mousedown happened inside a popup, don't
// try to set focus on one of its containing elements
const nsStyleDisplay* display = currFrame->StyleDisplay();
if (display->mDisplay == NS_STYLE_DISPLAY_POPUP) {
newFocus = nullptr;
break;
}
int32_t tabIndexUnused;
if (currFrame->IsFocusable(&tabIndexUnused, true)) {
newFocus = currFrame->GetContent();
nsCOMPtr<nsIDOMElement> domElement(do_QueryInterface(newFocus));
if (domElement)
break;
}
currFrame = currFrame->GetParent();
}
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm) {
// if something was found to focus, focus it. Otherwise, if the
// element that was clicked doesn't have -moz-user-focus: ignore,
// clear the existing focus. For -moz-user-focus: ignore, the focus
// is just left as is.
// Another effect of mouse clicking, handled in nsSelection, is that
// it should update the caret position to where the mouse was
// clicked. Because the focus is cleared when clicking on a
// non-focusable node, the next press of the tab key will cause
// focus to be shifted from the caret position instead of the root.
if (newFocus && currFrame) {
// use the mouse flag and the noscroll flag so that the content
// doesn't unexpectedly scroll when clicking an element that is
// only hald visible
nsCOMPtr<nsIDOMElement> newFocusElement = do_QueryInterface(newFocus);
fm->SetFocus(newFocusElement, nsIFocusManager::FLAG_BYMOUSE |
nsIFocusManager::FLAG_NOSCROLL);
}
else if (!suppressBlur) {
// clear the focus within the frame and then set it as the
// focused frame
EnsureDocument(mPresContext);
if (mDocument) {
#ifdef XP_MACOSX
if (!activeContent || !activeContent->IsXULElement())
#endif
fm->ClearFocus(mDocument->GetWindow());
fm->SetFocusedWindow(mDocument->GetWindow());
}
}
}
// The rest is left button-specific.
if (mouseEvent->button != WidgetMouseEvent::eLeftButton) {
break;
}
if (activeContent) {
// The nearest enclosing element goes into the
// :active state. If we fail the QI to DOMElement,
// then we know we're only a node, and that we need
// to obtain our parent element and put it into :active
// instead.
nsCOMPtr<nsIDOMElement> elt(do_QueryInterface(activeContent));
if (!elt) {
nsIContent* par = activeContent->GetParent();
if (par)
activeContent = par;
}
}
}
else {
// if we're here, the event handler returned false, so stop
// any of our own processing of a drag. Workaround for bug 43258.
StopTrackingDragGesture();
// When the event was cancelled, there is currently a chrome document
// focused and a mousedown just occurred on a content document, ensure
// that the window that was clicked is focused.
EnsureDocument(mPresContext);
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (mDocument && fm) {
nsCOMPtr<nsIDOMWindow> currentWindow;
fm->GetFocusedWindow(getter_AddRefs(currentWindow));
if (currentWindow && mDocument->GetWindow() &&
currentWindow != mDocument->GetWindow() &&
!nsContentUtils::IsChromeDoc(mDocument)) {
nsCOMPtr<nsIDOMWindow> currentTop;
nsCOMPtr<nsIDOMWindow> newTop;
currentWindow->GetTop(getter_AddRefs(currentTop));
mDocument->GetWindow()->GetTop(getter_AddRefs(newTop));
nsCOMPtr<nsPIDOMWindow> win = do_QueryInterface(currentWindow);
nsCOMPtr<nsIDocument> currentDoc = win->GetExtantDoc();
if (nsContentUtils::IsChromeDoc(currentDoc) ||
(currentTop && newTop && currentTop != newTop)) {
fm->SetFocusedWindow(mDocument->GetWindow());
}
}
}
}
SetActiveManager(this, activeContent);
}
break;
case NS_POINTER_CANCEL: {
if(WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent()) {
GenerateMouseEnterExit(mouseEvent);
}
// This break was commented specially
// break;
}
case NS_POINTER_UP: {
WidgetPointerEvent* pointerEvent = aEvent->AsPointerEvent();
// After UP/Cancel Touch pointers become invalid so we can remove relevant helper from Table
// Mouse/Pen pointers are valid all the time (not only between down/up)
if (pointerEvent->inputSource == nsIDOMMouseEvent::MOZ_SOURCE_TOUCH) {
mPointersEnterLeaveHelper.Remove(pointerEvent->pointerId);
GenerateMouseEnterExit(pointerEvent);
}
break;
}
case NS_MOUSE_BUTTON_UP:
{
ClearGlobalActiveContent(this);
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
if (mouseEvent && mouseEvent->IsReal()) {
if (!mCurrentTarget) {
GetEventTarget();
}
// Make sure to dispatch the click even if there is no frame for
// the current target element. This is required for Web compatibility.
ret = CheckForAndDispatchClick(presContext, mouseEvent, aStatus);
}
nsIPresShell *shell = presContext->GetPresShell();
if (shell) {
nsRefPtr<nsFrameSelection> frameSelection = shell->FrameSelection();
frameSelection->SetDragState(false);
}
}
break;
case NS_WHEEL_STOP:
{
MOZ_ASSERT(aEvent->mFlags.mIsTrusted);
ScrollbarsForWheel::MayInactivate();
WidgetWheelEvent* wheelEvent = aEvent->AsWheelEvent();
nsIScrollableFrame* scrollTarget =
ComputeScrollTarget(aTargetFrame, wheelEvent,
COMPUTE_DEFAULT_ACTION_TARGET);
if (scrollTarget) {
scrollTarget->ScrollSnap();
}
}
break;
case NS_WHEEL_WHEEL:
case NS_WHEEL_START:
{
MOZ_ASSERT(aEvent->mFlags.mIsTrusted);
if (*aStatus == nsEventStatus_eConsumeNoDefault) {
ScrollbarsForWheel::Inactivate();
break;
}
WidgetWheelEvent* wheelEvent = aEvent->AsWheelEvent();
// When APZ is enabled, the actual scroll animation might be handled by
// the compositor.
WheelPrefs::Action action;
if (wheelEvent->mFlags.mHandledByAPZ) {
action = WheelPrefs::ACTION_NONE;
} else {
action = WheelPrefs::GetInstance()->ComputeActionFor(wheelEvent);
}
switch (action) {
case WheelPrefs::ACTION_SCROLL: {
// For scrolling of default action, we should honor the mouse wheel
// transaction.
ScrollbarsForWheel::PrepareToScrollText(this, aTargetFrame, wheelEvent);
if (aEvent->message != NS_WHEEL_WHEEL ||
(!wheelEvent->deltaX && !wheelEvent->deltaY)) {
break;
}
nsIScrollableFrame* scrollTarget =
ComputeScrollTarget(aTargetFrame, wheelEvent,
COMPUTE_DEFAULT_ACTION_TARGET);
ScrollbarsForWheel::SetActiveScrollTarget(scrollTarget);
nsIFrame* rootScrollFrame = !aTargetFrame ? nullptr :
aTargetFrame->PresContext()->PresShell()->GetRootScrollFrame();
nsIScrollableFrame* rootScrollableFrame = nullptr;
if (rootScrollFrame) {
rootScrollableFrame = do_QueryFrame(rootScrollFrame);
}
if (!scrollTarget || scrollTarget == rootScrollableFrame) {
wheelEvent->mViewPortIsOverscrolled = true;
}
wheelEvent->overflowDeltaX = wheelEvent->deltaX;
wheelEvent->overflowDeltaY = wheelEvent->deltaY;
WheelPrefs::GetInstance()->
CancelApplyingUserPrefsFromOverflowDelta(wheelEvent);
if (scrollTarget) {
DoScrollText(scrollTarget, wheelEvent);
} else {
WheelTransaction::EndTransaction();
ScrollbarsForWheel::Inactivate();
}
break;
}
case WheelPrefs::ACTION_HISTORY: {
// If this event doesn't cause NS_MOUSE_SCROLL event or the direction
// is oblique, don't perform history back/forward.
int32_t intDelta = wheelEvent->GetPreferredIntDelta();
if (!intDelta) {
break;
}
DoScrollHistory(intDelta);
break;
}
case WheelPrefs::ACTION_ZOOM: {
// If this event doesn't cause NS_MOUSE_SCROLL event or the direction
// is oblique, don't perform zoom in/out.
int32_t intDelta = wheelEvent->GetPreferredIntDelta();
if (!intDelta) {
break;
}
DoScrollZoom(aTargetFrame, intDelta);
break;
}
case WheelPrefs::ACTION_NONE:
default:
// If we don't handle the wheel event, all of the delta values must
// be overflown delta values.
wheelEvent->overflowDeltaX = wheelEvent->deltaX;
wheelEvent->overflowDeltaY = wheelEvent->deltaY;
WheelPrefs::GetInstance()->
CancelApplyingUserPrefsFromOverflowDelta(wheelEvent);
break;
}
*aStatus = nsEventStatus_eConsumeNoDefault;
}
break;
case NS_GESTURENOTIFY_EVENT_START:
{
if (nsEventStatus_eConsumeNoDefault != *aStatus) {
DecideGestureEvent(aEvent->AsGestureNotifyEvent(), mCurrentTarget);
}
}
break;
case NS_DRAGDROP_ENTER:
case NS_DRAGDROP_OVER:
{
NS_ASSERTION(aEvent->mClass == eDragEventClass, "Expected a drag event");
nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
if (!dragSession)
break;
// Reset the flag.
dragSession->SetOnlyChromeDrop(false);
if (mPresContext) {
EnsureDocument(mPresContext);
}
bool isChromeDoc = nsContentUtils::IsChromeDoc(mDocument);
// the initial dataTransfer is the one from the dragstart event that
// was set on the dragSession when the drag began.
nsCOMPtr<nsIDOMDataTransfer> dataTransfer;
nsCOMPtr<nsIDOMDataTransfer> initialDataTransfer;
dragSession->GetDataTransfer(getter_AddRefs(initialDataTransfer));
WidgetDragEvent *dragEvent = aEvent->AsDragEvent();
// collect any changes to moz cursor settings stored in the event's
// data transfer.
UpdateDragDataTransfer(dragEvent);
// cancelling a dragenter or dragover event means that a drop should be
// allowed, so update the dropEffect and the canDrop state to indicate
// that a drag is allowed. If the event isn't cancelled, a drop won't be
// allowed. Essentially, to allow a drop somewhere, specify the effects
// using the effectAllowed and dropEffect properties in a dragenter or
// dragover event and cancel the event. To not allow a drop somewhere,
// don't cancel the event or set the effectAllowed or dropEffect to
// "none". This way, if the event is just ignored, no drop will be
// allowed.
uint32_t dropEffect = nsIDragService::DRAGDROP_ACTION_NONE;
uint32_t action = nsIDragService::DRAGDROP_ACTION_NONE;
if (nsEventStatus_eConsumeNoDefault == *aStatus) {
// if the event has a dataTransfer set, use it.
if (dragEvent->dataTransfer) {
// get the dataTransfer and the dropEffect that was set on it
dataTransfer = do_QueryInterface(dragEvent->dataTransfer);
dataTransfer->GetDropEffectInt(&dropEffect);
}
else {
// if dragEvent->dataTransfer is null, it means that no attempt was
// made to access the dataTransfer during the event, yet the event
// was cancelled. Instead, use the initial data transfer available
// from the drag session. The drop effect would not have been
// initialized (which is done in DragEvent::GetDataTransfer),
// so set it from the drag action. We'll still want to filter it
// based on the effectAllowed below.
dataTransfer = initialDataTransfer;
dragSession->GetDragAction(&action);
// filter the drop effect based on the action. Use UNINITIALIZED as
// any effect is allowed.
dropEffect = nsContentUtils::FilterDropEffect(action,
nsIDragService::DRAGDROP_ACTION_UNINITIALIZED);
}
// At this point, if the dataTransfer is null, it means that the
// drag was originally started by directly calling the drag service.
// Just assume that all effects are allowed.
uint32_t effectAllowed = nsIDragService::DRAGDROP_ACTION_UNINITIALIZED;
if (dataTransfer)
dataTransfer->GetEffectAllowedInt(&effectAllowed);
// set the drag action based on the drop effect and effect allowed.
// The drop effect field on the drag transfer object specifies the
// desired current drop effect. However, it cannot be used if the
// effectAllowed state doesn't include that type of action. If the
// dropEffect is "none", then the action will be 'none' so a drop will
// not be allowed.
if (effectAllowed == nsIDragService::DRAGDROP_ACTION_UNINITIALIZED ||
dropEffect & effectAllowed)
action = dropEffect;
if (action == nsIDragService::DRAGDROP_ACTION_NONE)
dropEffect = nsIDragService::DRAGDROP_ACTION_NONE;
// inform the drag session that a drop is allowed on this node.
dragSession->SetDragAction(action);
dragSession->SetCanDrop(action != nsIDragService::DRAGDROP_ACTION_NONE);
// For now, do this only for dragover.
//XXXsmaug dragenter needs some more work.
if (aEvent->message == NS_DRAGDROP_OVER && !isChromeDoc) {
// Someone has called preventDefault(), check whether is was on
// content or chrome.
dragSession->SetOnlyChromeDrop(
!dragEvent->mDefaultPreventedOnContent);
}
} else if (aEvent->message == NS_DRAGDROP_OVER && !isChromeDoc) {
// No one called preventDefault(), so handle drop only in chrome.
dragSession->SetOnlyChromeDrop(true);
}
if (ContentChild* child = ContentChild::GetSingleton()) {
child->SendUpdateDropEffect(action, dropEffect);
}
if (dispatchedToContentProcess) {
dragSession->SetCanDrop(true);
} else if (initialDataTransfer) {
// Now set the drop effect in the initial dataTransfer. This ensures
// that we can get the desired drop effect in the drop event. For events
// dispatched to content, the content process will take care of setting
// this.
initialDataTransfer->SetDropEffectInt(dropEffect);
}
}
break;
case NS_DRAGDROP_DROP:
{
// now fire the dragdrop event, for compatibility with XUL
if (mCurrentTarget && nsEventStatus_eConsumeNoDefault != *aStatus) {
nsCOMPtr<nsIContent> targetContent;
mCurrentTarget->GetContentForEvent(aEvent,
getter_AddRefs(targetContent));
nsCOMPtr<nsIWidget> widget = mCurrentTarget->GetNearestWidget();
WidgetDragEvent event(aEvent->mFlags.mIsTrusted,
NS_DRAGDROP_DRAGDROP, widget);
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
event.refPoint = mouseEvent->refPoint;
if (mouseEvent->widget) {
event.refPoint += mouseEvent->widget->WidgetToScreenOffset();
}
event.refPoint -= widget->WidgetToScreenOffset();
event.modifiers = mouseEvent->modifiers;
event.buttons = mouseEvent->buttons;
event.inputSource = mouseEvent->inputSource;
nsEventStatus status = nsEventStatus_eIgnore;
nsCOMPtr<nsIPresShell> presShell = mPresContext->GetPresShell();
if (presShell) {
presShell->HandleEventWithTarget(&event, mCurrentTarget,
targetContent, &status);
}
}
sLastDragOverFrame = nullptr;
ClearGlobalActiveContent(this);
break;
}
case NS_DRAGDROP_EXIT:
// make sure to fire the enter and exit_synth events after the
// NS_DRAGDROP_EXIT event, otherwise we'll clean up too early
GenerateDragDropEnterExit(presContext, aEvent->AsDragEvent());
break;
case NS_KEY_BEFORE_UP:
case NS_KEY_UP:
case NS_KEY_AFTER_UP:
break;
case NS_KEY_PRESS:
{
WidgetKeyboardEvent* keyEvent = aEvent->AsKeyboardEvent();
PostHandleKeyboardEvent(keyEvent, *aStatus, dispatchedToContentProcess);
}
break;
case NS_MOUSE_ENTER_WIDGET:
if (mCurrentTarget) {
nsCOMPtr<nsIContent> targetContent;
mCurrentTarget->GetContentForEvent(aEvent, getter_AddRefs(targetContent));
SetContentState(targetContent, NS_EVENT_STATE_HOVER);
}
break;
#ifdef XP_MACOSX
case NS_MOUSE_ACTIVATE:
if (mCurrentTarget) {
nsCOMPtr<nsIContent> targetContent;
mCurrentTarget->GetContentForEvent(aEvent, getter_AddRefs(targetContent));
if (!NodeAllowsClickThrough(targetContent)) {
*aStatus = nsEventStatus_eConsumeNoDefault;
}
}
break;
#endif
}
//Reset target frame to null to avoid mistargeting after reentrant event
mCurrentTarget = nullptr;
mCurrentTargetContent = nullptr;
return ret;
}
bool
EventStateManager::RemoteQueryContentEvent(WidgetEvent* aEvent)
{
WidgetQueryContentEvent* queryEvent = aEvent->AsQueryContentEvent();
if (!IsTargetCrossProcess(queryEvent)) {
return false;
}
// Will not be handled locally, remote the event
GetCrossProcessTarget()->HandleQueryContentEvent(*queryEvent);
return true;
}
TabParent*
EventStateManager::GetCrossProcessTarget()
{
return TabParent::GetIMETabParent();
}
bool
EventStateManager::IsTargetCrossProcess(WidgetGUIEvent* aEvent)
{
// Check to see if there is a focused, editable content in chrome,
// in that case, do not forward IME events to content
nsIContent *focusedContent = GetFocusedContent();
if (focusedContent && focusedContent->IsEditable())
return false;
return TabParent::GetIMETabParent() != nullptr;
}
void
EventStateManager::NotifyDestroyPresContext(nsPresContext* aPresContext)
{
IMEStateManager::OnDestroyPresContext(aPresContext);
if (mHoverContent) {
// Bug 70855: Presentation is going away, possibly for a reframe.
// Reset the hover state so that if we're recreating the presentation,
// we won't have the old hover state still set in the new presentation,
// as if the new presentation is resized, a new element may be hovered.
SetContentState(nullptr, NS_EVENT_STATE_HOVER);
}
mPointersEnterLeaveHelper.Clear();
}
void
EventStateManager::SetPresContext(nsPresContext* aPresContext)
{
mPresContext = aPresContext;
}
void
EventStateManager::ClearFrameRefs(nsIFrame* aFrame)
{
if (aFrame && aFrame == mCurrentTarget) {
mCurrentTargetContent = aFrame->GetContent();
}
}
void
EventStateManager::UpdateCursor(nsPresContext* aPresContext,
WidgetEvent* aEvent,
nsIFrame* aTargetFrame,
nsEventStatus* aStatus)
{
if (aTargetFrame && IsRemoteTarget(aTargetFrame->GetContent())) {
return;
}
int32_t cursor = NS_STYLE_CURSOR_DEFAULT;
imgIContainer* container = nullptr;
bool haveHotspot = false;
float hotspotX = 0.0f, hotspotY = 0.0f;
//If cursor is locked just use the locked one
if (mLockCursor) {
cursor = mLockCursor;
}
//If not locked, look for correct cursor
else if (aTargetFrame) {
nsIFrame::Cursor framecursor;
nsPoint pt = nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent,
aTargetFrame);
if (NS_FAILED(aTargetFrame->GetCursor(pt, framecursor)))
return; // don't update the cursor if we failed to get it from the frame see bug 118877
cursor = framecursor.mCursor;
container = framecursor.mContainer;
haveHotspot = framecursor.mHaveHotspot;
hotspotX = framecursor.mHotspotX;
hotspotY = framecursor.mHotspotY;
}
if (Preferences::GetBool("ui.use_activity_cursor", false)) {
// Check whether or not to show the busy cursor
nsCOMPtr<nsIDocShell> docShell(aPresContext->GetDocShell());
if (!docShell) return;
uint32_t busyFlags = nsIDocShell::BUSY_FLAGS_NONE;
docShell->GetBusyFlags(&busyFlags);
// Show busy cursor everywhere before page loads
// and just replace the arrow cursor after page starts loading
if (busyFlags & nsIDocShell::BUSY_FLAGS_BUSY &&
(cursor == NS_STYLE_CURSOR_AUTO || cursor == NS_STYLE_CURSOR_DEFAULT))
{
cursor = NS_STYLE_CURSOR_SPINNING;
container = nullptr;
}
}
if (aTargetFrame) {
SetCursor(cursor, container, haveHotspot, hotspotX, hotspotY,
aTargetFrame->GetNearestWidget(), false);
}
if (mLockCursor || NS_STYLE_CURSOR_AUTO != cursor) {
*aStatus = nsEventStatus_eConsumeDoDefault;
}
}
void
EventStateManager::ClearCachedWidgetCursor(nsIFrame* aTargetFrame)
{
if (!aTargetFrame) {
return;
}
nsIWidget* aWidget = aTargetFrame->GetNearestWidget();
if (!aWidget) {
return;
}
aWidget->ClearCachedCursor();
}
nsresult
EventStateManager::SetCursor(int32_t aCursor, imgIContainer* aContainer,
bool aHaveHotspot,
float aHotspotX, float aHotspotY,
nsIWidget* aWidget, bool aLockCursor)
{
EnsureDocument(mPresContext);
NS_ENSURE_TRUE(mDocument, NS_ERROR_FAILURE);
sMouseOverDocument = mDocument.get();
nsCursor c;
NS_ENSURE_TRUE(aWidget, NS_ERROR_FAILURE);
if (aLockCursor) {
if (NS_STYLE_CURSOR_AUTO != aCursor) {
mLockCursor = aCursor;
}
else {
//If cursor style is set to auto we unlock the cursor again.
mLockCursor = 0;
}
}
switch (aCursor) {
default:
case NS_STYLE_CURSOR_AUTO:
case NS_STYLE_CURSOR_DEFAULT:
c = eCursor_standard;
break;
case NS_STYLE_CURSOR_POINTER:
c = eCursor_hyperlink;
break;
case NS_STYLE_CURSOR_CROSSHAIR:
c = eCursor_crosshair;
break;
case NS_STYLE_CURSOR_MOVE:
c = eCursor_move;
break;
case NS_STYLE_CURSOR_TEXT:
c = eCursor_select;
break;
case NS_STYLE_CURSOR_WAIT:
c = eCursor_wait;
break;
case NS_STYLE_CURSOR_HELP:
c = eCursor_help;
break;
case NS_STYLE_CURSOR_N_RESIZE:
c = eCursor_n_resize;
break;
case NS_STYLE_CURSOR_S_RESIZE:
c = eCursor_s_resize;
break;
case NS_STYLE_CURSOR_W_RESIZE:
c = eCursor_w_resize;
break;
case NS_STYLE_CURSOR_E_RESIZE:
c = eCursor_e_resize;
break;
case NS_STYLE_CURSOR_NW_RESIZE:
c = eCursor_nw_resize;
break;
case NS_STYLE_CURSOR_SE_RESIZE:
c = eCursor_se_resize;
break;
case NS_STYLE_CURSOR_NE_RESIZE:
c = eCursor_ne_resize;
break;
case NS_STYLE_CURSOR_SW_RESIZE:
c = eCursor_sw_resize;
break;
case NS_STYLE_CURSOR_COPY: // CSS3
c = eCursor_copy;
break;
case NS_STYLE_CURSOR_ALIAS:
c = eCursor_alias;
break;
case NS_STYLE_CURSOR_CONTEXT_MENU:
c = eCursor_context_menu;
break;
case NS_STYLE_CURSOR_CELL:
c = eCursor_cell;
break;
case NS_STYLE_CURSOR_GRAB:
c = eCursor_grab;
break;
case NS_STYLE_CURSOR_GRABBING:
c = eCursor_grabbing;
break;
case NS_STYLE_CURSOR_SPINNING:
c = eCursor_spinning;
break;
case NS_STYLE_CURSOR_ZOOM_IN:
c = eCursor_zoom_in;
break;
case NS_STYLE_CURSOR_ZOOM_OUT:
c = eCursor_zoom_out;
break;
case NS_STYLE_CURSOR_NOT_ALLOWED:
c = eCursor_not_allowed;
break;
case NS_STYLE_CURSOR_COL_RESIZE:
c = eCursor_col_resize;
break;
case NS_STYLE_CURSOR_ROW_RESIZE:
c = eCursor_row_resize;
break;
case NS_STYLE_CURSOR_NO_DROP:
c = eCursor_no_drop;
break;
case NS_STYLE_CURSOR_VERTICAL_TEXT:
c = eCursor_vertical_text;
break;
case NS_STYLE_CURSOR_ALL_SCROLL:
c = eCursor_all_scroll;
break;
case NS_STYLE_CURSOR_NESW_RESIZE:
c = eCursor_nesw_resize;
break;
case NS_STYLE_CURSOR_NWSE_RESIZE:
c = eCursor_nwse_resize;
break;
case NS_STYLE_CURSOR_NS_RESIZE:
c = eCursor_ns_resize;
break;
case NS_STYLE_CURSOR_EW_RESIZE:
c = eCursor_ew_resize;
break;
case NS_STYLE_CURSOR_NONE:
c = eCursor_none;
break;
}
// First, try the imgIContainer, if non-null
nsresult rv = NS_ERROR_FAILURE;
if (aContainer) {
uint32_t hotspotX, hotspotY;
// css3-ui says to use the CSS-specified hotspot if present,
// otherwise use the intrinsic hotspot, otherwise use the top left
// corner.
if (aHaveHotspot) {
int32_t imgWidth, imgHeight;
aContainer->GetWidth(&imgWidth);
aContainer->GetHeight(&imgHeight);
// XXX std::max(NS_lround(x), 0)?
hotspotX = aHotspotX > 0.0f
? uint32_t(aHotspotX + 0.5f) : uint32_t(0);
if (hotspotX >= uint32_t(imgWidth))
hotspotX = imgWidth - 1;
hotspotY = aHotspotY > 0.0f
? uint32_t(aHotspotY + 0.5f) : uint32_t(0);
if (hotspotY >= uint32_t(imgHeight))
hotspotY = imgHeight - 1;
} else {
hotspotX = 0;
hotspotY = 0;
nsCOMPtr<nsIProperties> props(do_QueryInterface(aContainer));
if (props) {
nsCOMPtr<nsISupportsPRUint32> hotspotXWrap, hotspotYWrap;
props->Get("hotspotX", NS_GET_IID(nsISupportsPRUint32), getter_AddRefs(hotspotXWrap));
props->Get("hotspotY", NS_GET_IID(nsISupportsPRUint32), getter_AddRefs(hotspotYWrap));
if (hotspotXWrap)
hotspotXWrap->GetData(&hotspotX);
if (hotspotYWrap)
hotspotYWrap->GetData(&hotspotY);
}
}
rv = aWidget->SetCursor(aContainer, hotspotX, hotspotY);
}
if (NS_FAILED(rv))
aWidget->SetCursor(c);
return NS_OK;
}
class MOZ_STACK_CLASS ESMEventCB : public EventDispatchingCallback
{
public:
explicit ESMEventCB(nsIContent* aTarget) : mTarget(aTarget) {}
virtual void HandleEvent(EventChainPostVisitor& aVisitor)
{
if (aVisitor.mPresContext) {
nsIFrame* frame = aVisitor.mPresContext->GetPrimaryFrameFor(mTarget);
if (frame) {
frame->HandleEvent(aVisitor.mPresContext,
aVisitor.mEvent->AsGUIEvent(),
&aVisitor.mEventStatus);
}
}
}
nsCOMPtr<nsIContent> mTarget;
};
/*static*/ bool
EventStateManager::IsHandlingUserInput()
{
if (sUserInputEventDepth <= 0) {
return false;
}
TimeDuration timeout = nsContentUtils::HandlingUserInputTimeout();
TimeDuration elapsed = TimeStamp::Now() - sHandlingInputStart;
bool inTime = timeout <= TimeDuration(0) || elapsed <= timeout;
if (!inTime) {
#ifdef DEBUG
printf("EventStateManager::IsHandlingUserInput() has timed out "
"(timeout: %f, elapsed: %f)\n",
timeout.ToMilliseconds(), elapsed.ToMilliseconds());
#endif
return false;
}
return true;
}
static void
CreateMouseOrPointerWidgetEvent(WidgetMouseEvent* aMouseEvent,
uint32_t aMessage,
nsIContent* aRelatedContent,
nsAutoPtr<WidgetMouseEvent>& aNewEvent)
{
WidgetPointerEvent* sourcePointer = aMouseEvent->AsPointerEvent();
if (sourcePointer) {
PROFILER_LABEL("Input", "DispatchPointerEvent",
js::ProfileEntry::Category::EVENTS);
nsAutoPtr<WidgetPointerEvent> newPointerEvent;
newPointerEvent =
new WidgetPointerEvent(aMouseEvent->mFlags.mIsTrusted, aMessage,
aMouseEvent->widget);
newPointerEvent->isPrimary = sourcePointer->isPrimary;
newPointerEvent->pointerId = sourcePointer->pointerId;
newPointerEvent->width = sourcePointer->width;
newPointerEvent->height = sourcePointer->height;
newPointerEvent->inputSource = sourcePointer->inputSource;
newPointerEvent->relatedTarget =
nsIPresShell::GetPointerCapturingContent(sourcePointer->pointerId)
? nullptr
: aRelatedContent;
aNewEvent = newPointerEvent.forget();
} else {
aNewEvent =
new WidgetMouseEvent(aMouseEvent->mFlags.mIsTrusted, aMessage,
aMouseEvent->widget, WidgetMouseEvent::eReal);
aNewEvent->relatedTarget = aRelatedContent;
}
aNewEvent->refPoint = aMouseEvent->refPoint;
aNewEvent->modifiers = aMouseEvent->modifiers;
aNewEvent->button = aMouseEvent->button;
aNewEvent->buttons = aMouseEvent->buttons;
aNewEvent->pressure = aMouseEvent->pressure;
aNewEvent->mPluginEvent = aMouseEvent->mPluginEvent;
aNewEvent->inputSource = aMouseEvent->inputSource;
}
nsIFrame*
EventStateManager::DispatchMouseOrPointerEvent(WidgetMouseEvent* aMouseEvent,
uint32_t aMessage,
nsIContent* aTargetContent,
nsIContent* aRelatedContent)
{
// http://dvcs.w3.org/hg/webevents/raw-file/default/mouse-lock.html#methods
// "[When the mouse is locked on an element...e]vents that require the concept
// of a mouse cursor must not be dispatched (for example: mouseover, mouseout).
if (sIsPointerLocked &&
(aMessage == NS_MOUSELEAVE ||
aMessage == NS_MOUSEENTER ||
aMessage == NS_MOUSE_OVER ||
aMessage == NS_MOUSE_OUT)) {
mCurrentTargetContent = nullptr;
nsCOMPtr<Element> pointerLockedElement =
do_QueryReferent(EventStateManager::sPointerLockedElement);
if (!pointerLockedElement) {
NS_WARNING("Should have pointer locked element, but didn't.");
return nullptr;
}
nsCOMPtr<nsIContent> content = do_QueryInterface(pointerLockedElement);
return mPresContext->GetPrimaryFrameFor(content);
}
mCurrentTargetContent = nullptr;
if (!aTargetContent) {
return nullptr;
}
nsAutoPtr<WidgetMouseEvent> dispatchEvent;
CreateMouseOrPointerWidgetEvent(aMouseEvent, aMessage,
aRelatedContent, dispatchEvent);
nsWeakFrame previousTarget = mCurrentTarget;
mCurrentTargetContent = aTargetContent;
nsIFrame* targetFrame = nullptr;
if (aMouseEvent->AsMouseEvent()) {
PROFILER_LABEL("Input", "DispatchMouseEvent",
js::ProfileEntry::Category::EVENTS);
}
nsEventStatus status = nsEventStatus_eIgnore;
ESMEventCB callback(aTargetContent);
EventDispatcher::Dispatch(aTargetContent, mPresContext, dispatchEvent, nullptr,
&status, &callback);
if (mPresContext) {
// Although the primary frame was checked in event callback, it may not be
// the same object after event dispatch and handling, so refetch it.
targetFrame = mPresContext->GetPrimaryFrameFor(aTargetContent);
// If we are entering/leaving remote content, dispatch a mouse enter/exit
// event to the remote frame.
if (IsRemoteTarget(aTargetContent)) {
if (aMessage == NS_MOUSE_OUT) {
// For remote content, send a "top-level" widget mouse exit event.
nsAutoPtr<WidgetMouseEvent> remoteEvent;
CreateMouseOrPointerWidgetEvent(aMouseEvent, NS_MOUSE_EXIT_WIDGET,
aRelatedContent, remoteEvent);
remoteEvent->exit = WidgetMouseEvent::eTopLevel;
// mCurrentTarget is set to the new target, so we must reset it to the
// old target and then dispatch a cross-process event. (mCurrentTarget
// will be set back below.) HandleCrossProcessEvent will query for the
// proper target via GetEventTarget which will return mCurrentTarget.
mCurrentTarget = targetFrame;
HandleCrossProcessEvent(remoteEvent, &status);
} else if (aMessage == NS_MOUSE_OVER) {
nsAutoPtr<WidgetMouseEvent> remoteEvent;
CreateMouseOrPointerWidgetEvent(aMouseEvent, NS_MOUSE_ENTER_WIDGET,
aRelatedContent, remoteEvent);
HandleCrossProcessEvent(remoteEvent, &status);
}
}
}
mCurrentTargetContent = nullptr;
mCurrentTarget = previousTarget;
return targetFrame;
}
class EnterLeaveDispatcher
{
public:
EnterLeaveDispatcher(EventStateManager* aESM,
nsIContent* aTarget, nsIContent* aRelatedTarget,
WidgetMouseEvent* aMouseEvent, uint32_t aType)
: mESM(aESM)
, mMouseEvent(aMouseEvent)
, mType(aType)
{
nsPIDOMWindow* win =
aTarget ? aTarget->OwnerDoc()->GetInnerWindow() : nullptr;
if (aMouseEvent->AsPointerEvent() ? win && win->HasPointerEnterLeaveEventListeners() :
win && win->HasMouseEnterLeaveEventListeners()) {
mRelatedTarget = aRelatedTarget ?
aRelatedTarget->FindFirstNonChromeOnlyAccessContent() : nullptr;
nsINode* commonParent = nullptr;
if (aTarget && aRelatedTarget) {
commonParent =
nsContentUtils::GetCommonAncestor(aTarget, aRelatedTarget);
}
nsIContent* current = aTarget;
// Note, it is ok if commonParent is null!
while (current && current != commonParent) {
if (!current->ChromeOnlyAccess()) {
mTargets.AppendObject(current);
}
// mouseenter/leave is fired only on elements.
current = current->GetParent();
}
}
}
~EnterLeaveDispatcher()
{
if (mType == NS_MOUSEENTER ||
mType == NS_POINTER_ENTER) {
for (int32_t i = mTargets.Count() - 1; i >= 0; --i) {
mESM->DispatchMouseOrPointerEvent(mMouseEvent, mType, mTargets[i],
mRelatedTarget);
}
} else {
for (int32_t i = 0; i < mTargets.Count(); ++i) {
mESM->DispatchMouseOrPointerEvent(mMouseEvent, mType, mTargets[i],
mRelatedTarget);
}
}
}
EventStateManager* mESM;
nsCOMArray<nsIContent> mTargets;
nsCOMPtr<nsIContent> mRelatedTarget;
WidgetMouseEvent* mMouseEvent;
uint32_t mType;
};
void
EventStateManager::NotifyMouseOut(WidgetMouseEvent* aMouseEvent,
nsIContent* aMovingInto)
{
OverOutElementsWrapper* wrapper = GetWrapperByEventID(aMouseEvent);
if (!wrapper->mLastOverElement)
return;
// Before firing mouseout, check for recursion
if (wrapper->mLastOverElement == wrapper->mFirstOutEventElement)
return;
if (wrapper->mLastOverFrame) {
// if the frame is associated with a subdocument,
// tell the subdocument that we're moving out of it
nsSubDocumentFrame* subdocFrame = do_QueryFrame(wrapper->mLastOverFrame.GetFrame());
if (subdocFrame) {
nsCOMPtr<nsIDocShell> docshell;
subdocFrame->GetDocShell(getter_AddRefs(docshell));
if (docshell) {
nsRefPtr<nsPresContext> presContext;
docshell->GetPresContext(getter_AddRefs(presContext));
if (presContext) {
EventStateManager* kidESM = presContext->EventStateManager();
// Not moving into any element in this subdocument
kidESM->NotifyMouseOut(aMouseEvent, nullptr);
}
}
}
}
// That could have caused DOM events which could wreak havoc. Reverify
// things and be careful.
if (!wrapper->mLastOverElement)
return;
// Store the first mouseOut event we fire and don't refire mouseOut
// to that element while the first mouseOut is still ongoing.
wrapper->mFirstOutEventElement = wrapper->mLastOverElement;
// Don't touch hover state if aMovingInto is non-null. Caller will update
// hover state itself, and we have optimizations for hover switching between
// two nearby elements both deep in the DOM tree that would be defeated by
// switching the hover state to null here.
bool isPointer = aMouseEvent->mClass == ePointerEventClass;
if (!aMovingInto && !isPointer) {
// Unset :hover
SetContentState(nullptr, NS_EVENT_STATE_HOVER);
}
// In case we go out from capturing element (retargetedByPointerCapture is true)
// we should dispatch NS_POINTER_LEAVE event and only for capturing element.
nsRefPtr<nsIContent> movingInto = aMouseEvent->retargetedByPointerCapture
? wrapper->mLastOverElement->GetParent()
: aMovingInto;
EnterLeaveDispatcher leaveDispatcher(this, wrapper->mLastOverElement,
movingInto, aMouseEvent,
isPointer ? NS_POINTER_LEAVE : NS_MOUSELEAVE);
// Fire mouseout
DispatchMouseOrPointerEvent(aMouseEvent, isPointer ? NS_POINTER_OUT : NS_MOUSE_OUT,
wrapper->mLastOverElement, aMovingInto);
wrapper->mLastOverFrame = nullptr;
wrapper->mLastOverElement = nullptr;
// Turn recursion protection back off
wrapper->mFirstOutEventElement = nullptr;
}
void
EventStateManager::NotifyMouseOver(WidgetMouseEvent* aMouseEvent,
nsIContent* aContent)
{
NS_ASSERTION(aContent, "Mouse must be over something");
// If pointer capture is set, we should suppress pointerover/pointerenter events
// for all elements except element which have pointer capture.
bool dispatch = !aMouseEvent->retargetedByPointerCapture;
OverOutElementsWrapper* wrapper = GetWrapperByEventID(aMouseEvent);
if (wrapper->mLastOverElement == aContent && dispatch)
return;
// Before firing mouseover, check for recursion
if (aContent == wrapper->mFirstOverEventElement)
return;
// Check to see if we're a subdocument and if so update the parent
// document's ESM state to indicate that the mouse is over the
// content associated with our subdocument.
EnsureDocument(mPresContext);
if (nsIDocument *parentDoc = mDocument->GetParentDocument()) {
if (nsIContent *docContent = parentDoc->FindContentForSubDocument(mDocument)) {
if (nsIPresShell *parentShell = parentDoc->GetShell()) {
EventStateManager* parentESM =
parentShell->GetPresContext()->EventStateManager();
parentESM->NotifyMouseOver(aMouseEvent, docContent);
}
}
}
// Firing the DOM event in the parent document could cause all kinds
// of havoc. Reverify and take care.
if (wrapper->mLastOverElement == aContent && dispatch)
return;
// Remember mLastOverElement as the related content for the
// DispatchMouseOrPointerEvent() call below, since NotifyMouseOut() resets it, bug 298477.
nsCOMPtr<nsIContent> lastOverElement = wrapper->mLastOverElement;
bool isPointer = aMouseEvent->mClass == ePointerEventClass;
Maybe<EnterLeaveDispatcher> enterDispatcher;
if (dispatch) {
enterDispatcher.emplace(this, aContent, lastOverElement, aMouseEvent,
isPointer ? NS_POINTER_ENTER : NS_MOUSEENTER);
}
NotifyMouseOut(aMouseEvent, aContent);
// Store the first mouseOver event we fire and don't refire mouseOver
// to that element while the first mouseOver is still ongoing.
wrapper->mFirstOverEventElement = aContent;
if (!isPointer) {
SetContentState(aContent, NS_EVENT_STATE_HOVER);
}
if (dispatch) {
// Fire mouseover
wrapper->mLastOverFrame =
DispatchMouseOrPointerEvent(aMouseEvent,
isPointer ? NS_POINTER_OVER : NS_MOUSE_OVER,
aContent, lastOverElement);
wrapper->mLastOverElement = aContent;
} else {
wrapper->mLastOverFrame = nullptr;
wrapper->mLastOverElement = nullptr;
}
// Turn recursion protection back off
wrapper->mFirstOverEventElement = nullptr;
}
// Returns the center point of the window's inner content area.
// This is in widget coordinates, i.e. relative to the widget's top
// left corner, not in screen coordinates, the same units that
// UIEvent::refPoint is in.
//
// XXX Hack alert: XXX
// However, we do the computation in integer CSS pixels, NOT device pix,
// in order to fudge around the one-pixel error in innerHeight in fullscreen
// mode (see bug 799523 comment 35, and bug 729011). Using integer CSS pix
// makes us throw away the fractional error that results, rather than having
// it manifest as a potential one-device-pix discrepancy.
static LayoutDeviceIntPoint
GetWindowInnerRectCenter(nsPIDOMWindow* aWindow,
nsIWidget* aWidget,
nsPresContext* aContext)
{
NS_ENSURE_TRUE(aWindow && aWidget && aContext, LayoutDeviceIntPoint(0, 0));
float cssInnerX = 0.0;
aWindow->GetMozInnerScreenX(&cssInnerX);
int32_t innerX = int32_t(NS_round(cssInnerX));
float cssInnerY = 0.0;
aWindow->GetMozInnerScreenY(&cssInnerY);
int32_t innerY = int32_t(NS_round(cssInnerY));
int32_t innerWidth = 0;
aWindow->GetInnerWidth(&innerWidth);
int32_t innerHeight = 0;
aWindow->GetInnerHeight(&innerHeight);
nsIntRect screen;
aWidget->GetScreenBounds(screen);
int32_t cssScreenX = aContext->DevPixelsToIntCSSPixels(screen.x);
int32_t cssScreenY = aContext->DevPixelsToIntCSSPixels(screen.y);
return LayoutDeviceIntPoint(
aContext->CSSPixelsToDevPixels(innerX - cssScreenX + innerWidth / 2),
aContext->CSSPixelsToDevPixels(innerY - cssScreenY + innerHeight / 2));
}
void
EventStateManager::GeneratePointerEnterExit(uint32_t aMessage, WidgetMouseEvent* aEvent)
{
WidgetPointerEvent pointerEvent(*aEvent);
pointerEvent.message = aMessage;
GenerateMouseEnterExit(&pointerEvent);
}
void
EventStateManager::GenerateMouseEnterExit(WidgetMouseEvent* aMouseEvent)
{
EnsureDocument(mPresContext);
if (!mDocument)
return;
// Hold onto old target content through the event and reset after.
nsCOMPtr<nsIContent> targetBeforeEvent = mCurrentTargetContent;
switch(aMouseEvent->message) {
case NS_MOUSE_MOVE:
{
// Mouse movement is reported on the MouseEvent.movement{X,Y} fields.
// Movement is calculated in UIEvent::GetMovementPoint() as:
// previous_mousemove_refPoint - current_mousemove_refPoint.
if (sIsPointerLocked && aMouseEvent->widget) {
// The pointer is locked. If the pointer is not located at the center of
// the window, dispatch a synthetic mousemove to return the pointer there.
// Doing this between "real" pointer moves gives the impression that the
// (locked) pointer can continue moving and won't stop at the screen
// boundary. We cancel the synthetic event so that we don't end up
// dispatching the centering move event to content.
LayoutDeviceIntPoint center =
GetWindowInnerRectCenter(mDocument->GetWindow(), aMouseEvent->widget,
mPresContext);
aMouseEvent->lastRefPoint = center;
if (aMouseEvent->refPoint != center) {
// Mouse move doesn't finish at the center of the window. Dispatch a
// synthetic native mouse event to move the pointer back to the center
// of the window, to faciliate more movement. But first, record that
// we've dispatched a synthetic mouse movement, so we can cancel it
// in the other branch here.
sSynthCenteringPoint = center;
aMouseEvent->widget->SynthesizeNativeMouseMove(
center + aMouseEvent->widget->WidgetToScreenOffset(), nullptr);
} else if (aMouseEvent->refPoint == sSynthCenteringPoint) {
// This is the "synthetic native" event we dispatched to re-center the
// pointer. Cancel it so we don't expose the centering move to content.
aMouseEvent->mFlags.mPropagationStopped = true;
// Clear sSynthCenteringPoint so we don't cancel other events
// targeted at the center.
sSynthCenteringPoint = kInvalidRefPoint;
}
} else if (sLastRefPoint == kInvalidRefPoint) {
// We don't have a valid previous mousemove refPoint. This is either
// the first move we've encountered, or the mouse has just re-entered
// the application window. We should report (0,0) movement for this
// case, so make the current and previous refPoints the same.
aMouseEvent->lastRefPoint = aMouseEvent->refPoint;
} else {
aMouseEvent->lastRefPoint = sLastRefPoint;
}
// Update the last known refPoint with the current refPoint.
sLastRefPoint = aMouseEvent->refPoint;
}
case NS_POINTER_MOVE:
case NS_POINTER_DOWN:
{
// Get the target content target (mousemove target == mouseover target)
nsCOMPtr<nsIContent> targetElement = GetEventTargetContent(aMouseEvent);
if (!targetElement) {
// We're always over the document root, even if we're only
// over dead space in a page (whose frame is not associated with
// any content) or in print preview dead space
targetElement = mDocument->GetRootElement();
}
if (targetElement) {
NotifyMouseOver(aMouseEvent, targetElement);
}
}
break;
case NS_POINTER_UP:
{
// Get the target content target (mousemove target == mouseover target)
nsCOMPtr<nsIContent> targetElement = GetEventTargetContent(aMouseEvent);
if (!targetElement) {
// We're always over the document root, even if we're only
// over dead space in a page (whose frame is not associated with
// any content) or in print preview dead space
targetElement = mDocument->GetRootElement();
}
if (targetElement) {
OverOutElementsWrapper* helper = GetWrapperByEventID(aMouseEvent);
if (helper) {
helper->mLastOverElement = targetElement;
}
NotifyMouseOut(aMouseEvent, nullptr);
}
}
break;
case NS_POINTER_LEAVE:
case NS_POINTER_CANCEL:
case NS_MOUSE_EXIT_WIDGET:
{
// This is actually the window mouse exit or pointer leave event. We're not moving
// into any new element.
OverOutElementsWrapper* helper = GetWrapperByEventID(aMouseEvent);
if (helper->mLastOverFrame &&
nsContentUtils::GetTopLevelWidget(aMouseEvent->widget) !=
nsContentUtils::GetTopLevelWidget(helper->mLastOverFrame->GetNearestWidget())) {
// the Mouse/PointerOut event widget doesn't have same top widget with
// mLastOverFrame, it's a spurious event for mLastOverFrame
break;
}
// Reset sLastRefPoint, so that we'll know not to report any
// movement the next time we re-enter the window.
sLastRefPoint = kInvalidRefPoint;
NotifyMouseOut(aMouseEvent, nullptr);
}
break;
}
// reset mCurretTargetContent to what it was
mCurrentTargetContent = targetBeforeEvent;
}
OverOutElementsWrapper*
EventStateManager::GetWrapperByEventID(WidgetMouseEvent* aEvent)
{
WidgetPointerEvent* pointer = aEvent->AsPointerEvent();
if (!pointer) {
MOZ_ASSERT(aEvent->AsMouseEvent() != nullptr);
if (!mMouseEnterLeaveHelper) {
mMouseEnterLeaveHelper = new OverOutElementsWrapper();
}
return mMouseEnterLeaveHelper;
}
nsRefPtr<OverOutElementsWrapper> helper;
if (!mPointersEnterLeaveHelper.Get(pointer->pointerId, getter_AddRefs(helper))) {
helper = new OverOutElementsWrapper();
mPointersEnterLeaveHelper.Put(pointer->pointerId, helper);
}
return helper;
}
void
EventStateManager::SetPointerLock(nsIWidget* aWidget,
nsIContent* aElement)
{
// NOTE: aElement will be nullptr when unlocking.
sIsPointerLocked = !!aElement;
if (!aWidget) {
return;
}
// Reset mouse wheel transaction
WheelTransaction::EndTransaction();
// Deal with DnD events
nsCOMPtr<nsIDragService> dragService =
do_GetService("@mozilla.org/widget/dragservice;1");
if (sIsPointerLocked) {
// Store the last known ref point so we can reposition the pointer after unlock.
mPreLockPoint = sLastRefPoint;
// Fire a synthetic mouse move to ensure event state is updated. We first
// set the mouse to the center of the window, so that the mouse event
// doesn't report any movement.
sLastRefPoint = GetWindowInnerRectCenter(aElement->OwnerDoc()->GetWindow(),
aWidget,
mPresContext);
aWidget->SynthesizeNativeMouseMove(sLastRefPoint + aWidget->WidgetToScreenOffset(),
nullptr);
// Retarget all events to this element via capture.
nsIPresShell::SetCapturingContent(aElement, CAPTURE_POINTERLOCK);
// Suppress DnD
if (dragService) {
dragService->Suppress();
}
} else {
// Unlocking, so return pointer to the original position by firing a
// synthetic mouse event. We first reset sLastRefPoint to its
// pre-pointerlock position, so that the synthetic mouse event reports
// no movement.
sLastRefPoint = mPreLockPoint;
aWidget->SynthesizeNativeMouseMove(mPreLockPoint + aWidget->WidgetToScreenOffset(),
nullptr);
// Don't retarget events to this element any more.
nsIPresShell::SetCapturingContent(nullptr, CAPTURE_POINTERLOCK);
// Unsuppress DnD
if (dragService) {
dragService->Unsuppress();
}
}
}
void
EventStateManager::GenerateDragDropEnterExit(nsPresContext* aPresContext,
WidgetDragEvent* aDragEvent)
{
//Hold onto old target content through the event and reset after.
nsCOMPtr<nsIContent> targetBeforeEvent = mCurrentTargetContent;
switch(aDragEvent->message) {
case NS_DRAGDROP_OVER:
{
// when dragging from one frame to another, events are fired in the
// order: dragexit, dragenter, dragleave
if (sLastDragOverFrame != mCurrentTarget) {
//We'll need the content, too, to check if it changed separately from the frames.
nsCOMPtr<nsIContent> lastContent;
nsCOMPtr<nsIContent> targetContent;
mCurrentTarget->GetContentForEvent(aDragEvent,
getter_AddRefs(targetContent));
if (sLastDragOverFrame) {
//The frame has changed but the content may not have. Check before dispatching to content
sLastDragOverFrame->GetContentForEvent(aDragEvent,
getter_AddRefs(lastContent));
FireDragEnterOrExit(sLastDragOverFrame->PresContext(),
aDragEvent, NS_DRAGDROP_EXIT,
targetContent, lastContent, sLastDragOverFrame);
}
FireDragEnterOrExit(aPresContext, aDragEvent, NS_DRAGDROP_ENTER,
lastContent, targetContent, mCurrentTarget);
if (sLastDragOverFrame) {
FireDragEnterOrExit(sLastDragOverFrame->PresContext(),
aDragEvent, NS_DRAGDROP_LEAVE,
targetContent, lastContent, sLastDragOverFrame);
}
sLastDragOverFrame = mCurrentTarget;
}
}
break;
case NS_DRAGDROP_EXIT:
{
//This is actually the window mouse exit event.
if (sLastDragOverFrame) {
nsCOMPtr<nsIContent> lastContent;
sLastDragOverFrame->GetContentForEvent(aDragEvent,
getter_AddRefs(lastContent));
nsRefPtr<nsPresContext> lastDragOverFramePresContext = sLastDragOverFrame->PresContext();
FireDragEnterOrExit(lastDragOverFramePresContext,
aDragEvent, NS_DRAGDROP_EXIT,
nullptr, lastContent, sLastDragOverFrame);
FireDragEnterOrExit(lastDragOverFramePresContext,
aDragEvent, NS_DRAGDROP_LEAVE,
nullptr, lastContent, sLastDragOverFrame);
sLastDragOverFrame = nullptr;
}
}
break;
}
//reset mCurretTargetContent to what it was
mCurrentTargetContent = targetBeforeEvent;
// Now flush all pending notifications, for better responsiveness.
FlushPendingEvents(aPresContext);
}
void
EventStateManager::FireDragEnterOrExit(nsPresContext* aPresContext,
WidgetDragEvent* aDragEvent,
uint32_t aMsg,
nsIContent* aRelatedTarget,
nsIContent* aTargetContent,
nsWeakFrame& aTargetFrame)
{
nsEventStatus status = nsEventStatus_eIgnore;
WidgetDragEvent event(aDragEvent->mFlags.mIsTrusted, aMsg,
aDragEvent->widget);
event.refPoint = aDragEvent->refPoint;
event.modifiers = aDragEvent->modifiers;
event.buttons = aDragEvent->buttons;
event.relatedTarget = aRelatedTarget;
event.inputSource = aDragEvent->inputSource;
mCurrentTargetContent = aTargetContent;
if (aTargetContent != aRelatedTarget) {
//XXX This event should still go somewhere!!
if (aTargetContent) {
EventDispatcher::Dispatch(aTargetContent, aPresContext, &event,
nullptr, &status);
}
// adjust the drag hover if the dragenter event was cancelled or this is a drag exit
if (status == nsEventStatus_eConsumeNoDefault || aMsg == NS_DRAGDROP_EXIT)
SetContentState((aMsg == NS_DRAGDROP_ENTER) ? aTargetContent : nullptr,
NS_EVENT_STATE_DRAGOVER);
// collect any changes to moz cursor settings stored in the event's
// data transfer.
if (aMsg == NS_DRAGDROP_LEAVE || aMsg == NS_DRAGDROP_EXIT ||
aMsg == NS_DRAGDROP_ENTER)
UpdateDragDataTransfer(&event);
}
// Finally dispatch the event to the frame
if (aTargetFrame)
aTargetFrame->HandleEvent(aPresContext, &event, &status);
}
void
EventStateManager::UpdateDragDataTransfer(WidgetDragEvent* dragEvent)
{
NS_ASSERTION(dragEvent, "drag event is null in UpdateDragDataTransfer!");
if (!dragEvent->dataTransfer)
return;
nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
if (dragSession) {
// the initial dataTransfer is the one from the dragstart event that
// was set on the dragSession when the drag began.
nsCOMPtr<nsIDOMDataTransfer> initialDataTransfer;
dragSession->GetDataTransfer(getter_AddRefs(initialDataTransfer));
if (initialDataTransfer) {
// retrieve the current moz cursor setting and save it.
nsAutoString mozCursor;
dragEvent->dataTransfer->GetMozCursor(mozCursor);
initialDataTransfer->SetMozCursor(mozCursor);
}
}
}
nsresult
EventStateManager::SetClickCount(nsPresContext* aPresContext,
WidgetMouseEvent* aEvent,
nsEventStatus* aStatus)
{
nsCOMPtr<nsIContent> mouseContent;
nsIContent* mouseContentParent = nullptr;
if (mCurrentTarget) {
mCurrentTarget->GetContentForEvent(aEvent, getter_AddRefs(mouseContent));
}
if (mouseContent) {
if (mouseContent->IsNodeOfType(nsINode::eTEXT)) {
mouseContent = mouseContent->GetParent();
}
if (mouseContent && mouseContent->IsRootOfNativeAnonymousSubtree()) {
mouseContentParent = mouseContent->GetParent();
}
}
switch (aEvent->button) {
case WidgetMouseEvent::eLeftButton:
if (aEvent->message == NS_MOUSE_BUTTON_DOWN) {
mLastLeftMouseDownContent = mouseContent;
mLastLeftMouseDownContentParent = mouseContentParent;
} else if (aEvent->message == NS_MOUSE_BUTTON_UP) {
if (mLastLeftMouseDownContent == mouseContent ||
mLastLeftMouseDownContentParent == mouseContent ||
mLastLeftMouseDownContent == mouseContentParent) {
aEvent->clickCount = mLClickCount;
mLClickCount = 0;
} else {
aEvent->clickCount = 0;
}
mLastLeftMouseDownContent = nullptr;
mLastLeftMouseDownContentParent = nullptr;
}
break;
case WidgetMouseEvent::eMiddleButton:
if (aEvent->message == NS_MOUSE_BUTTON_DOWN) {
mLastMiddleMouseDownContent = mouseContent;
mLastMiddleMouseDownContentParent = mouseContentParent;
} else if (aEvent->message == NS_MOUSE_BUTTON_UP) {
if (mLastMiddleMouseDownContent == mouseContent ||
mLastMiddleMouseDownContentParent == mouseContent ||
mLastMiddleMouseDownContent == mouseContentParent) {
aEvent->clickCount = mMClickCount;
mMClickCount = 0;
} else {
aEvent->clickCount = 0;
}
mLastMiddleMouseDownContent = nullptr;
mLastMiddleMouseDownContentParent = nullptr;
}
break;
case WidgetMouseEvent::eRightButton:
if (aEvent->message == NS_MOUSE_BUTTON_DOWN) {
mLastRightMouseDownContent = mouseContent;
mLastRightMouseDownContentParent = mouseContentParent;
} else if (aEvent->message == NS_MOUSE_BUTTON_UP) {
if (mLastRightMouseDownContent == mouseContent ||
mLastRightMouseDownContentParent == mouseContent ||
mLastRightMouseDownContent == mouseContentParent) {
aEvent->clickCount = mRClickCount;
mRClickCount = 0;
} else {
aEvent->clickCount = 0;
}
mLastRightMouseDownContent = nullptr;
mLastRightMouseDownContentParent = nullptr;
}
break;
}
return NS_OK;
}
nsresult
EventStateManager::CheckForAndDispatchClick(nsPresContext* aPresContext,
WidgetMouseEvent* aEvent,
nsEventStatus* aStatus)
{
nsresult ret = NS_OK;
//If mouse is still over same element, clickcount will be > 1.
//If it has moved it will be zero, so no click.
if (0 != aEvent->clickCount) {
//Check that the window isn't disabled before firing a click
//(see bug 366544).
if (aEvent->widget && !aEvent->widget->IsEnabled()) {
return ret;
}
//fire click
bool notDispatchToContents =
(aEvent->button == WidgetMouseEvent::eMiddleButton ||
aEvent->button == WidgetMouseEvent::eRightButton);
WidgetMouseEvent event(aEvent->mFlags.mIsTrusted, NS_MOUSE_CLICK,
aEvent->widget, WidgetMouseEvent::eReal);
event.refPoint = aEvent->refPoint;
event.clickCount = aEvent->clickCount;
event.modifiers = aEvent->modifiers;
event.buttons = aEvent->buttons;
event.time = aEvent->time;
event.timeStamp = aEvent->timeStamp;
event.mFlags.mNoContentDispatch = notDispatchToContents;
event.button = aEvent->button;
event.inputSource = aEvent->inputSource;
nsCOMPtr<nsIPresShell> presShell = mPresContext->GetPresShell();
if (presShell) {
nsCOMPtr<nsIContent> mouseContent = GetEventTargetContent(aEvent);
// Click events apply to *elements* not nodes. At this point the target
// content may have been reset to some non-element content, and so we need
// to walk up the closest ancestor element, just like we do in
// nsPresShell::HandlePositionedEvent.
while (mouseContent && !mouseContent->IsElement()) {
mouseContent = mouseContent->GetParent();
}
if (!mouseContent && !mCurrentTarget) {
return NS_OK;
}
// HandleEvent clears out mCurrentTarget which we might need again
nsWeakFrame currentTarget = mCurrentTarget;
ret = presShell->HandleEventWithTarget(&event, currentTarget,
mouseContent, aStatus);
if (NS_SUCCEEDED(ret) && aEvent->clickCount == 2) {
//fire double click
WidgetMouseEvent event2(aEvent->mFlags.mIsTrusted, NS_MOUSE_DOUBLECLICK,
aEvent->widget, WidgetMouseEvent::eReal);
event2.refPoint = aEvent->refPoint;
event2.clickCount = aEvent->clickCount;
event2.modifiers = aEvent->modifiers;
event2.buttons = aEvent->buttons;
event2.mFlags.mNoContentDispatch = notDispatchToContents;
event2.button = aEvent->button;
event2.inputSource = aEvent->inputSource;
ret = presShell->HandleEventWithTarget(&event2, currentTarget,
mouseContent, aStatus);
}
}
}
return ret;
}
nsIFrame*
EventStateManager::GetEventTarget()
{
nsIPresShell *shell;
if (mCurrentTarget ||
!mPresContext ||
!(shell = mPresContext->GetPresShell())) {
return mCurrentTarget;
}
if (mCurrentTargetContent) {
mCurrentTarget = mPresContext->GetPrimaryFrameFor(mCurrentTargetContent);
if (mCurrentTarget) {
return mCurrentTarget;
}
}
nsIFrame* frame = shell->GetEventTargetFrame();
return (mCurrentTarget = frame);
}
already_AddRefed<nsIContent>
EventStateManager::GetEventTargetContent(WidgetEvent* aEvent)
{
if (aEvent &&
(aEvent->message == NS_FOCUS_CONTENT ||
aEvent->message == NS_BLUR_CONTENT)) {
nsCOMPtr<nsIContent> content = GetFocusedContent();
return content.forget();
}
if (mCurrentTargetContent) {
nsCOMPtr<nsIContent> content = mCurrentTargetContent;
return content.forget();
}
nsCOMPtr<nsIContent> content;
nsIPresShell *presShell = mPresContext->GetPresShell();
if (presShell) {
content = presShell->GetEventTargetContent(aEvent);
}
// Some events here may set mCurrentTarget but not set the corresponding
// event target in the PresShell.
if (!content && mCurrentTarget) {
mCurrentTarget->GetContentForEvent(aEvent, getter_AddRefs(content));
}
return content.forget();
}
static Element*
GetLabelTarget(nsIContent* aPossibleLabel)
{
mozilla::dom::HTMLLabelElement* label =
mozilla::dom::HTMLLabelElement::FromContent(aPossibleLabel);
if (!label)
return nullptr;
return label->GetLabeledElement();
}
static nsIContent* FindCommonAncestor(nsIContent *aNode1, nsIContent *aNode2)
{
// Find closest common ancestor
if (aNode1 && aNode2) {
// Find the nearest common ancestor by counting the distance to the
// root and then walking up again, in pairs.
int32_t offset = 0;
nsIContent *anc1 = aNode1;
for (;;) {
++offset;
nsIContent* parent = anc1->GetFlattenedTreeParent();
if (!parent)
break;
anc1 = parent;
}
nsIContent *anc2 = aNode2;
for (;;) {
--offset;
nsIContent* parent = anc2->GetFlattenedTreeParent();
if (!parent)
break;
anc2 = parent;
}
if (anc1 == anc2) {
anc1 = aNode1;
anc2 = aNode2;
while (offset > 0) {
anc1 = anc1->GetFlattenedTreeParent();
--offset;
}
while (offset < 0) {
anc2 = anc2->GetFlattenedTreeParent();
++offset;
}
while (anc1 != anc2) {
anc1 = anc1->GetFlattenedTreeParent();
anc2 = anc2->GetFlattenedTreeParent();
}
return anc1;
}
}
return nullptr;
}
static Element*
GetParentElement(Element* aElement)
{
nsIContent* p = aElement->GetParent();
return (p && p->IsElement()) ? p->AsElement() : nullptr;
}
/* static */
void
EventStateManager::SetFullScreenState(Element* aElement, bool aIsFullScreen)
{
DoStateChange(aElement, NS_EVENT_STATE_FULL_SCREEN, aIsFullScreen);
Element* ancestor = aElement;
while ((ancestor = GetParentElement(ancestor))) {
DoStateChange(ancestor, NS_EVENT_STATE_FULL_SCREEN_ANCESTOR, aIsFullScreen);
}
}
/* static */
inline void
EventStateManager::DoStateChange(Element* aElement, EventStates aState,
bool aAddState)
{
if (aAddState) {
aElement->AddStates(aState);
} else {
aElement->RemoveStates(aState);
}
}
/* static */
inline void
EventStateManager::DoStateChange(nsIContent* aContent, EventStates aState,
bool aStateAdded)
{
if (aContent->IsElement()) {
DoStateChange(aContent->AsElement(), aState, aStateAdded);
}
}
/* static */
void
EventStateManager::UpdateAncestorState(nsIContent* aStartNode,
nsIContent* aStopBefore,
EventStates aState,
bool aAddState)
{
for (; aStartNode && aStartNode != aStopBefore;
aStartNode = aStartNode->GetFlattenedTreeParent()) {
// We might be starting with a non-element (e.g. a text node) and
// if someone is doing something weird might be ending with a
// non-element too (e.g. a document fragment)
if (!aStartNode->IsElement()) {
continue;
}
Element* element = aStartNode->AsElement();
DoStateChange(element, aState, aAddState);
Element* labelTarget = GetLabelTarget(element);
if (labelTarget) {
DoStateChange(labelTarget, aState, aAddState);
}
}
if (aAddState) {
// We might be in a situation where a node was in hover both
// because it was hovered and because the label for it was
// hovered, and while we stopped hovering the node the label is
// still hovered. Or we might have had two nested labels for the
// same node, and while one is no longer hovered the other still
// is. In that situation, the label that's still hovered will be
// aStopBefore or some ancestor of it, and the call we just made
// to UpdateAncestorState with aAddState = false would have
// removed the hover state from the node. But the node should
// still be in hover state. To handle this situation we need to
// keep walking up the tree and any time we find a label mark its
// corresponding node as still in our state.
for ( ; aStartNode; aStartNode = aStartNode->GetFlattenedTreeParent()) {
if (!aStartNode->IsElement()) {
continue;
}
Element* labelTarget = GetLabelTarget(aStartNode->AsElement());
if (labelTarget && !labelTarget->State().HasState(aState)) {
DoStateChange(labelTarget, aState, true);
}
}
}
}
bool
EventStateManager::SetContentState(nsIContent* aContent, EventStates aState)
{
// We manage 4 states here: ACTIVE, HOVER, DRAGOVER, URLTARGET
// The input must be exactly one of them.
NS_PRECONDITION(aState == NS_EVENT_STATE_ACTIVE ||
aState == NS_EVENT_STATE_HOVER ||
aState == NS_EVENT_STATE_DRAGOVER ||
aState == NS_EVENT_STATE_URLTARGET,
"Unexpected state");
nsCOMPtr<nsIContent> notifyContent1;
nsCOMPtr<nsIContent> notifyContent2;
bool updateAncestors;
if (aState == NS_EVENT_STATE_HOVER || aState == NS_EVENT_STATE_ACTIVE) {
// Hover and active are hierarchical
updateAncestors = true;
// check to see that this state is allowed by style. Check dragover too?
// XXX Is this even what we want?
if (mCurrentTarget)
{
const nsStyleUserInterface* ui = mCurrentTarget->StyleUserInterface();
if (ui->mUserInput == NS_STYLE_USER_INPUT_NONE)
return false;
}
if (aState == NS_EVENT_STATE_ACTIVE) {
// Editable content can never become active since their default actions
// are disabled. Watch out for editable content in native anonymous
// subtrees though, as they belong to text controls.
if (aContent && aContent->IsEditable() &&
!aContent->IsInNativeAnonymousSubtree()) {
aContent = nullptr;
}
if (aContent != mActiveContent) {
notifyContent1 = aContent;
notifyContent2 = mActiveContent;
mActiveContent = aContent;
}
} else {
NS_ASSERTION(aState == NS_EVENT_STATE_HOVER, "How did that happen?");
nsIContent* newHover;
if (mPresContext->IsDynamic()) {
newHover = aContent;
} else {
NS_ASSERTION(!aContent ||
aContent->GetCrossShadowCurrentDoc() ==
mPresContext->PresShell()->GetDocument(),
"Unexpected document");
nsIFrame *frame = aContent ? aContent->GetPrimaryFrame() : nullptr;
if (frame && nsLayoutUtils::IsViewportScrollbarFrame(frame)) {
// The scrollbars of viewport should not ignore the hover state.
// Because they are *not* the content of the web page.
newHover = aContent;
} else {
// All contents of the web page should ignore the hover state.
newHover = nullptr;
}
}
if (newHover != mHoverContent) {
notifyContent1 = newHover;
notifyContent2 = mHoverContent;
mHoverContent = newHover;
}
}
} else {
updateAncestors = false;
if (aState == NS_EVENT_STATE_DRAGOVER) {
if (aContent != sDragOverContent) {
notifyContent1 = aContent;
notifyContent2 = sDragOverContent;
sDragOverContent = aContent;
}
} else if (aState == NS_EVENT_STATE_URLTARGET) {
if (aContent != mURLTargetContent) {
notifyContent1 = aContent;
notifyContent2 = mURLTargetContent;
mURLTargetContent = aContent;
}
}
}
// We need to keep track of which of notifyContent1 and notifyContent2 is
// getting the state set and which is getting it unset. If both are
// non-null, then notifyContent1 is having the state set and notifyContent2
// is having it unset. But if one of them is null, we need to keep track of
// the right thing for notifyContent1 explicitly.
bool content1StateSet = true;
if (!notifyContent1) {
// This is ok because FindCommonAncestor wouldn't find anything
// anyway if notifyContent1 is null.
notifyContent1 = notifyContent2;
notifyContent2 = nullptr;
content1StateSet = false;
}
if (notifyContent1 && mPresContext) {
EnsureDocument(mPresContext);
if (mDocument) {
nsAutoScriptBlocker scriptBlocker;
if (updateAncestors) {
nsCOMPtr<nsIContent> commonAncestor =
FindCommonAncestor(notifyContent1, notifyContent2);
if (notifyContent2) {
// It's very important to first notify the state removal and
// then the state addition, because due to labels it's
// possible that we're removing state from some element but
// then adding it again (say because mHoverContent changed
// from a control to its label).
UpdateAncestorState(notifyContent2, commonAncestor, aState, false);
}
UpdateAncestorState(notifyContent1, commonAncestor, aState,
content1StateSet);
} else {
if (notifyContent2) {
DoStateChange(notifyContent2, aState, false);
}
DoStateChange(notifyContent1, aState, content1StateSet);
}
}
}
return true;
}
PLDHashOperator
EventStateManager::ResetLastOverForContent(
const uint32_t& aIdx,
nsRefPtr<OverOutElementsWrapper>& aElemWrapper,
void* aClosure)
{
nsIContent* content = static_cast<nsIContent*>(aClosure);
if (aElemWrapper && aElemWrapper->mLastOverElement &&
nsContentUtils::ContentIsDescendantOf(aElemWrapper->mLastOverElement, content)) {
aElemWrapper->mLastOverElement = nullptr;
}
return PL_DHASH_NEXT;
}
void
EventStateManager::ContentRemoved(nsIDocument* aDocument, nsIContent* aContent)
{
/*
* Anchor and area elements when focused or hovered might make the UI to show
* the current link. We want to make sure that the UI gets informed when they
* are actually removed from the DOM.
*/
if (aContent->IsAnyOfHTMLElements(nsGkAtoms::a, nsGkAtoms::area) &&
(aContent->AsElement()->State().HasAtLeastOneOfStates(NS_EVENT_STATE_FOCUS |
NS_EVENT_STATE_HOVER))) {
nsGenericHTMLElement* element = static_cast<nsGenericHTMLElement*>(aContent);
element->LeaveLink(
element->GetPresContext(nsGenericHTMLElement::eForComposedDoc));
}
IMEStateManager::OnRemoveContent(mPresContext, aContent);
// inform the focus manager that the content is being removed. If this
// content is focused, the focus will be removed without firing events.
nsFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm)
fm->ContentRemoved(aDocument, aContent);
if (mHoverContent &&
nsContentUtils::ContentIsDescendantOf(mHoverContent, aContent)) {
// Since hover is hierarchical, set the current hover to the
// content's parent node.
SetContentState(aContent->GetParent(), NS_EVENT_STATE_HOVER);
}
if (mActiveContent &&
nsContentUtils::ContentIsDescendantOf(mActiveContent, aContent)) {
// Active is hierarchical, so set the current active to the
// content's parent node.
SetContentState(aContent->GetParent(), NS_EVENT_STATE_ACTIVE);
}
if (sDragOverContent &&
sDragOverContent->OwnerDoc() == aContent->OwnerDoc() &&
nsContentUtils::ContentIsDescendantOf(sDragOverContent, aContent)) {
sDragOverContent = nullptr;
}
// See bug 292146 for why we want to null this out
ResetLastOverForContent(0, mMouseEnterLeaveHelper, aContent);
mPointersEnterLeaveHelper.Enumerate(
&EventStateManager::ResetLastOverForContent, aContent);
}
bool
EventStateManager::EventStatusOK(WidgetGUIEvent* aEvent)
{
return !(aEvent->message == NS_MOUSE_BUTTON_DOWN &&
aEvent->AsMouseEvent()->button == WidgetMouseEvent::eLeftButton &&
!sNormalLMouseEventInProcess);
}
//-------------------------------------------
// Access Key Registration
//-------------------------------------------
void
EventStateManager::RegisterAccessKey(nsIContent* aContent, uint32_t aKey)
{
if (aContent && mAccessKeys.IndexOf(aContent) == -1)
mAccessKeys.AppendObject(aContent);
}
void
EventStateManager::UnregisterAccessKey(nsIContent* aContent, uint32_t aKey)
{
if (aContent)
mAccessKeys.RemoveObject(aContent);
}
uint32_t
EventStateManager::GetRegisteredAccessKey(nsIContent* aContent)
{
MOZ_ASSERT(aContent);
if (mAccessKeys.IndexOf(aContent) == -1)
return 0;
nsAutoString accessKey;
aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::accesskey, accessKey);
return accessKey.First();
}
void
EventStateManager::EnsureDocument(nsPresContext* aPresContext)
{
if (!mDocument)
mDocument = aPresContext->Document();
}
void
EventStateManager::FlushPendingEvents(nsPresContext* aPresContext)
{
NS_PRECONDITION(nullptr != aPresContext, "nullptr ptr");
nsIPresShell *shell = aPresContext->GetPresShell();
if (shell) {
shell->FlushPendingNotifications(Flush_InterruptibleLayout);
}
}
nsIContent*
EventStateManager::GetFocusedContent()
{
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (!fm || !mDocument)
return nullptr;
nsCOMPtr<nsPIDOMWindow> focusedWindow;
return nsFocusManager::GetFocusedDescendant(mDocument->GetWindow(), false,
getter_AddRefs(focusedWindow));
}
//-------------------------------------------------------
// Return true if the docshell is visible
bool
EventStateManager::IsShellVisible(nsIDocShell* aShell)
{
NS_ASSERTION(aShell, "docshell is null");
nsCOMPtr<nsIBaseWindow> basewin = do_QueryInterface(aShell);
if (!basewin)
return true;
bool isVisible = true;
basewin->GetVisibility(&isVisible);
// We should be doing some additional checks here so that
// we don't tab into hidden tabs of tabbrowser. -bryner
return isVisible;
}
nsresult
EventStateManager::DoContentCommandEvent(WidgetContentCommandEvent* aEvent)
{
EnsureDocument(mPresContext);
NS_ENSURE_TRUE(mDocument, NS_ERROR_FAILURE);
nsCOMPtr<nsPIDOMWindow> window(mDocument->GetWindow());
NS_ENSURE_TRUE(window, NS_ERROR_FAILURE);
nsCOMPtr<nsPIWindowRoot> root = window->GetTopWindowRoot();
NS_ENSURE_TRUE(root, NS_ERROR_FAILURE);
const char* cmd;
switch (aEvent->message) {
case NS_CONTENT_COMMAND_CUT:
cmd = "cmd_cut";
break;
case NS_CONTENT_COMMAND_COPY:
cmd = "cmd_copy";
break;
case NS_CONTENT_COMMAND_PASTE:
cmd = "cmd_paste";
break;
case NS_CONTENT_COMMAND_DELETE:
cmd = "cmd_delete";
break;
case NS_CONTENT_COMMAND_UNDO:
cmd = "cmd_undo";
break;
case NS_CONTENT_COMMAND_REDO:
cmd = "cmd_redo";
break;
case NS_CONTENT_COMMAND_PASTE_TRANSFERABLE:
cmd = "cmd_pasteTransferable";
break;
default:
return NS_ERROR_NOT_IMPLEMENTED;
}
nsCOMPtr<nsIController> controller;
nsresult rv = root->GetControllerForCommand(cmd, getter_AddRefs(controller));
NS_ENSURE_SUCCESS(rv, rv);
if (!controller) {
// When GetControllerForCommand succeeded but there is no controller, the
// command isn't supported.
aEvent->mIsEnabled = false;
} else {
bool canDoIt;
rv = controller->IsCommandEnabled(cmd, &canDoIt);
NS_ENSURE_SUCCESS(rv, rv);
aEvent->mIsEnabled = canDoIt;
if (canDoIt && !aEvent->mOnlyEnabledCheck) {
switch (aEvent->message) {
case NS_CONTENT_COMMAND_PASTE_TRANSFERABLE: {
nsCOMPtr<nsICommandController> commandController = do_QueryInterface(controller);
NS_ENSURE_STATE(commandController);
nsCOMPtr<nsICommandParams> params = do_CreateInstance("@mozilla.org/embedcomp/command-params;1", &rv);
NS_ENSURE_SUCCESS(rv, rv);
rv = params->SetISupportsValue("transferable", aEvent->mTransferable);
NS_ENSURE_SUCCESS(rv, rv);
rv = commandController->DoCommandWithParams(cmd, params);
break;
}
default:
rv = controller->DoCommand(cmd);
break;
}
NS_ENSURE_SUCCESS(rv, rv);
}
}
aEvent->mSucceeded = true;
return NS_OK;
}
nsresult
EventStateManager::DoContentCommandScrollEvent(
WidgetContentCommandEvent* aEvent)
{
NS_ENSURE_TRUE(mPresContext, NS_ERROR_NOT_AVAILABLE);
nsIPresShell* ps = mPresContext->GetPresShell();
NS_ENSURE_TRUE(ps, NS_ERROR_NOT_AVAILABLE);
NS_ENSURE_TRUE(aEvent->mScroll.mAmount != 0, NS_ERROR_INVALID_ARG);
nsIScrollableFrame::ScrollUnit scrollUnit;
switch (aEvent->mScroll.mUnit) {
case WidgetContentCommandEvent::eCmdScrollUnit_Line:
scrollUnit = nsIScrollableFrame::LINES;
break;
case WidgetContentCommandEvent::eCmdScrollUnit_Page:
scrollUnit = nsIScrollableFrame::PAGES;
break;
case WidgetContentCommandEvent::eCmdScrollUnit_Whole:
scrollUnit = nsIScrollableFrame::WHOLE;
break;
default:
return NS_ERROR_INVALID_ARG;
}
aEvent->mSucceeded = true;
nsIScrollableFrame* sf =
ps->GetFrameToScrollAsScrollable(nsIPresShell::eEither);
aEvent->mIsEnabled = sf ?
(aEvent->mScroll.mIsHorizontal ?
WheelHandlingUtils::CanScrollOn(sf, aEvent->mScroll.mAmount, 0) :
WheelHandlingUtils::CanScrollOn(sf, 0, aEvent->mScroll.mAmount)) : false;
if (!aEvent->mIsEnabled || aEvent->mOnlyEnabledCheck) {
return NS_OK;
}
nsIntPoint pt(0, 0);
if (aEvent->mScroll.mIsHorizontal) {
pt.x = aEvent->mScroll.mAmount;
} else {
pt.y = aEvent->mScroll.mAmount;
}
// The caller may want synchronous scrolling.
sf->ScrollBy(pt, scrollUnit, nsIScrollableFrame::INSTANT);
return NS_OK;
}
void
EventStateManager::DoQuerySelectedText(WidgetQueryContentEvent* aEvent)
{
if (RemoteQueryContentEvent(aEvent)) {
return;
}
ContentEventHandler handler(mPresContext);
handler.OnQuerySelectedText(aEvent);
}
void
EventStateManager::SetActiveManager(EventStateManager* aNewESM,
nsIContent* aContent)
{
if (sActiveESM && aNewESM != sActiveESM) {
sActiveESM->SetContentState(nullptr, NS_EVENT_STATE_ACTIVE);
}
sActiveESM = aNewESM;
if (sActiveESM && aContent) {
sActiveESM->SetContentState(aContent, NS_EVENT_STATE_ACTIVE);
}
}
void
EventStateManager::ClearGlobalActiveContent(EventStateManager* aClearer)
{
if (aClearer) {
aClearer->SetContentState(nullptr, NS_EVENT_STATE_ACTIVE);
if (sDragOverContent) {
aClearer->SetContentState(nullptr, NS_EVENT_STATE_DRAGOVER);
}
}
if (sActiveESM && aClearer != sActiveESM) {
sActiveESM->SetContentState(nullptr, NS_EVENT_STATE_ACTIVE);
}
sActiveESM = nullptr;
}
/******************************************************************/
/* mozilla::EventStateManager::DeltaAccumulator */
/******************************************************************/
void
EventStateManager::DeltaAccumulator::InitLineOrPageDelta(
nsIFrame* aTargetFrame,
EventStateManager* aESM,
WidgetWheelEvent* aEvent)
{
MOZ_ASSERT(aESM);
MOZ_ASSERT(aEvent);
// Reset if the previous wheel event is too old.
if (!mLastTime.IsNull()) {
TimeDuration duration = TimeStamp::Now() - mLastTime;
if (duration.ToMilliseconds() > WheelTransaction::GetTimeoutTime()) {
Reset();
}
}
// If we have accumulated delta, we may need to reset it.
if (IsInTransaction()) {
// If wheel event type is changed, reset the values.
if (mHandlingDeltaMode != aEvent->deltaMode ||
mIsNoLineOrPageDeltaDevice != aEvent->mIsNoLineOrPageDelta) {
Reset();
} else {
// If the delta direction is changed, we should reset only the
// accumulated values.
if (mX && aEvent->deltaX && ((aEvent->deltaX > 0.0) != (mX > 0.0))) {
mX = mPendingScrollAmountX = 0.0;
}
if (mY && aEvent->deltaY && ((aEvent->deltaY > 0.0) != (mY > 0.0))) {
mY = mPendingScrollAmountY = 0.0;
}
}
}
mHandlingDeltaMode = aEvent->deltaMode;
mIsNoLineOrPageDeltaDevice = aEvent->mIsNoLineOrPageDelta;
// If it's handling neither a device that does not provide line or page deltas
// nor delta values multiplied by prefs, we must not modify lineOrPageDelta
// values.
if (!mIsNoLineOrPageDeltaDevice &&
!EventStateManager::WheelPrefs::GetInstance()->
NeedToComputeLineOrPageDelta(aEvent)) {
// Set the delta values to mX and mY. They would be used when above block
// resets mX/mY/mPendingScrollAmountX/mPendingScrollAmountY if the direction
// is changed.
// NOTE: We shouldn't accumulate the delta values, it might could cause
// overflow even though it's not a realistic situation.
if (aEvent->deltaX) {
mX = aEvent->deltaX;
}
if (aEvent->deltaY) {
mY = aEvent->deltaY;
}
mLastTime = TimeStamp::Now();
return;
}
mX += aEvent->deltaX;
mY += aEvent->deltaY;
if (mHandlingDeltaMode == nsIDOMWheelEvent::DOM_DELTA_PIXEL) {
// Records pixel delta values and init lineOrPageDeltaX and
// lineOrPageDeltaY for wheel events which are caused by pixel only
// devices. Ignore mouse wheel transaction for computing this. The
// lineOrPageDelta values will be used by dispatching legacy
// eMouseScrollEventClass (DOMMouseScroll) but not be used for scrolling
// of default action. The transaction should be used only for the default
// action.
nsIScrollableFrame* scrollTarget =
aESM->ComputeScrollTarget(aTargetFrame, aEvent,
COMPUTE_LEGACY_MOUSE_SCROLL_EVENT_TARGET);
nsIFrame* frame = do_QueryFrame(scrollTarget);
nsPresContext* pc =
frame ? frame->PresContext() : aTargetFrame->PresContext();
nsSize scrollAmount = aESM->GetScrollAmount(pc, aEvent, scrollTarget);
nsIntSize scrollAmountInCSSPixels(
nsPresContext::AppUnitsToIntCSSPixels(scrollAmount.width),
nsPresContext::AppUnitsToIntCSSPixels(scrollAmount.height));
aEvent->lineOrPageDeltaX = RoundDown(mX) / scrollAmountInCSSPixels.width;
aEvent->lineOrPageDeltaY = RoundDown(mY) / scrollAmountInCSSPixels.height;
mX -= aEvent->lineOrPageDeltaX * scrollAmountInCSSPixels.width;
mY -= aEvent->lineOrPageDeltaY * scrollAmountInCSSPixels.height;
} else {
aEvent->lineOrPageDeltaX = RoundDown(mX);
aEvent->lineOrPageDeltaY = RoundDown(mY);
mX -= aEvent->lineOrPageDeltaX;
mY -= aEvent->lineOrPageDeltaY;
}
mLastTime = TimeStamp::Now();
}
void
EventStateManager::DeltaAccumulator::Reset()
{
mX = mY = 0.0;
mPendingScrollAmountX = mPendingScrollAmountY = 0.0;
mHandlingDeltaMode = UINT32_MAX;
mIsNoLineOrPageDeltaDevice = false;
}
nsIntPoint
EventStateManager::DeltaAccumulator::ComputeScrollAmountForDefaultAction(
WidgetWheelEvent* aEvent,
const nsIntSize& aScrollAmountInDevPixels)
{
MOZ_ASSERT(aEvent);
// If the wheel event is line scroll and the delta value is computed from
// system settings, allow to override the system speed.
bool allowScrollSpeedOverride =
(!aEvent->customizedByUserPrefs &&
aEvent->deltaMode == nsIDOMWheelEvent::DOM_DELTA_LINE);
DeltaValues acceleratedDelta =
WheelTransaction::AccelerateWheelDelta(aEvent, allowScrollSpeedOverride);
nsIntPoint result(0, 0);
if (aEvent->deltaMode == nsIDOMWheelEvent::DOM_DELTA_PIXEL) {
mPendingScrollAmountX += acceleratedDelta.deltaX;
mPendingScrollAmountY += acceleratedDelta.deltaY;
} else {
mPendingScrollAmountX +=
aScrollAmountInDevPixels.width * acceleratedDelta.deltaX;
mPendingScrollAmountY +=
aScrollAmountInDevPixels.height * acceleratedDelta.deltaY;
}
result.x = RoundDown(mPendingScrollAmountX);
result.y = RoundDown(mPendingScrollAmountY);
mPendingScrollAmountX -= result.x;
mPendingScrollAmountY -= result.y;
return result;
}
/******************************************************************/
/* mozilla::EventStateManager::WheelPrefs */
/******************************************************************/
// static
EventStateManager::WheelPrefs*
EventStateManager::WheelPrefs::GetInstance()
{
if (!sInstance) {
sInstance = new WheelPrefs();
}
return sInstance;
}
// static
void
EventStateManager::WheelPrefs::Shutdown()
{
delete sInstance;
sInstance = nullptr;
}
// static
void
EventStateManager::WheelPrefs::OnPrefChanged(const char* aPrefName,
void* aClosure)
{
// forget all prefs, it's not problem for performance.
sInstance->Reset();
DeltaAccumulator::GetInstance()->Reset();
}
EventStateManager::WheelPrefs::WheelPrefs()
{
Reset();
Preferences::RegisterCallback(OnPrefChanged, "mousewheel.", nullptr);
}
EventStateManager::WheelPrefs::~WheelPrefs()
{
Preferences::UnregisterCallback(OnPrefChanged, "mousewheel.", nullptr);
}
void
EventStateManager::WheelPrefs::Reset()
{
memset(mInit, 0, sizeof(mInit));
}
EventStateManager::WheelPrefs::Index
EventStateManager::WheelPrefs::GetIndexFor(WidgetWheelEvent* aEvent)
{
if (!aEvent) {
return INDEX_DEFAULT;
}
Modifiers modifiers =
(aEvent->modifiers & (MODIFIER_ALT |
MODIFIER_CONTROL |
MODIFIER_META |
MODIFIER_SHIFT |
MODIFIER_OS));
switch (modifiers) {
case MODIFIER_ALT:
return INDEX_ALT;
case MODIFIER_CONTROL:
return INDEX_CONTROL;
case MODIFIER_META:
return INDEX_META;
case MODIFIER_SHIFT:
return INDEX_SHIFT;
case MODIFIER_OS:
return INDEX_OS;
default:
// If two or more modifier keys are pressed, we should use default
// settings.
return INDEX_DEFAULT;
}
}
void
EventStateManager::WheelPrefs::GetBasePrefName(
EventStateManager::WheelPrefs::Index aIndex,
nsACString& aBasePrefName)
{
aBasePrefName.AssignLiteral("mousewheel.");
switch (aIndex) {
case INDEX_ALT:
aBasePrefName.AppendLiteral("with_alt.");
break;
case INDEX_CONTROL:
aBasePrefName.AppendLiteral("with_control.");
break;
case INDEX_META:
aBasePrefName.AppendLiteral("with_meta.");
break;
case INDEX_SHIFT:
aBasePrefName.AppendLiteral("with_shift.");
break;
case INDEX_OS:
aBasePrefName.AppendLiteral("with_win.");
break;
case INDEX_DEFAULT:
default:
aBasePrefName.AppendLiteral("default.");
break;
}
}
void
EventStateManager::WheelPrefs::Init(EventStateManager::WheelPrefs::Index aIndex)
{
if (mInit[aIndex]) {
return;
}
mInit[aIndex] = true;
nsAutoCString basePrefName;
GetBasePrefName(aIndex, basePrefName);
nsAutoCString prefNameX(basePrefName);
prefNameX.AppendLiteral("delta_multiplier_x");
mMultiplierX[aIndex] =
static_cast<double>(Preferences::GetInt(prefNameX.get(), 100)) / 100;
nsAutoCString prefNameY(basePrefName);
prefNameY.AppendLiteral("delta_multiplier_y");
mMultiplierY[aIndex] =
static_cast<double>(Preferences::GetInt(prefNameY.get(), 100)) / 100;
nsAutoCString prefNameZ(basePrefName);
prefNameZ.AppendLiteral("delta_multiplier_z");
mMultiplierZ[aIndex] =
static_cast<double>(Preferences::GetInt(prefNameZ.get(), 100)) / 100;
nsAutoCString prefNameAction(basePrefName);
prefNameAction.AppendLiteral("action");
int32_t action = Preferences::GetInt(prefNameAction.get(), ACTION_SCROLL);
if (action < int32_t(ACTION_NONE) || action > int32_t(ACTION_LAST)) {
NS_WARNING("Unsupported action pref value, replaced with 'Scroll'.");
action = ACTION_SCROLL;
}
mActions[aIndex] = static_cast<Action>(action);
// Compute action values overridden by .override_x pref.
// At present, override is possible only for the x-direction
// because this pref is introduced mainly for tilt wheels.
prefNameAction.AppendLiteral(".override_x");
int32_t actionOverrideX = Preferences::GetInt(prefNameAction.get(), -1);
if (actionOverrideX < -1 || actionOverrideX > int32_t(ACTION_LAST)) {
NS_WARNING("Unsupported action override pref value, didn't override.");
actionOverrideX = -1;
}
mOverriddenActionsX[aIndex] = (actionOverrideX == -1)
? static_cast<Action>(action)
: static_cast<Action>(actionOverrideX);
}
void
EventStateManager::WheelPrefs::ApplyUserPrefsToDelta(WidgetWheelEvent* aEvent)
{
Index index = GetIndexFor(aEvent);
Init(index);
aEvent->deltaX *= mMultiplierX[index];
aEvent->deltaY *= mMultiplierY[index];
aEvent->deltaZ *= mMultiplierZ[index];
// If the multiplier is 1.0 or -1.0, i.e., it doesn't change the absolute
// value, we should use lineOrPageDelta values which were set by widget.
// Otherwise, we need to compute them from accumulated delta values.
if (!NeedToComputeLineOrPageDelta(aEvent)) {
aEvent->lineOrPageDeltaX *= static_cast<int32_t>(mMultiplierX[index]);
aEvent->lineOrPageDeltaY *= static_cast<int32_t>(mMultiplierY[index]);
} else {
aEvent->lineOrPageDeltaX = 0;
aEvent->lineOrPageDeltaY = 0;
}
aEvent->customizedByUserPrefs =
((mMultiplierX[index] != 1.0) || (mMultiplierY[index] != 1.0) ||
(mMultiplierZ[index] != 1.0));
}
void
EventStateManager::WheelPrefs::CancelApplyingUserPrefsFromOverflowDelta(
WidgetWheelEvent* aEvent)
{
Index index = GetIndexFor(aEvent);
Init(index);
// XXX If the multiplier pref value is negative, the scroll direction was
// changed and caused to scroll different direction. In such case,
// this method reverts the sign of overflowDelta. Does it make widget
// happy? Although, widget can know the pref applied delta values by
// referrencing the deltaX and deltaY of the event.
if (mMultiplierX[index]) {
aEvent->overflowDeltaX /= mMultiplierX[index];
}
if (mMultiplierY[index]) {
aEvent->overflowDeltaY /= mMultiplierY[index];
}
}
EventStateManager::WheelPrefs::Action
EventStateManager::WheelPrefs::ComputeActionFor(WidgetWheelEvent* aEvent)
{
Index index = GetIndexFor(aEvent);
Init(index);
bool deltaXPreferred =
(Abs(aEvent->deltaX) > Abs(aEvent->deltaY) &&
Abs(aEvent->deltaX) > Abs(aEvent->deltaZ));
Action* actions = deltaXPreferred ? mOverriddenActionsX : mActions;
if (actions[index] == ACTION_NONE || actions[index] == ACTION_SCROLL) {
return actions[index];
}
// Momentum events shouldn't run special actions.
if (aEvent->isMomentum) {
// Use the default action. Note that user might kill the wheel scrolling.
Init(INDEX_DEFAULT);
return (actions[INDEX_DEFAULT] == ACTION_SCROLL) ? ACTION_SCROLL :
ACTION_NONE;
}
return actions[index];
}
bool
EventStateManager::WheelPrefs::NeedToComputeLineOrPageDelta(
WidgetWheelEvent* aEvent)
{
Index index = GetIndexFor(aEvent);
Init(index);
return (mMultiplierX[index] != 1.0 && mMultiplierX[index] != -1.0) ||
(mMultiplierY[index] != 1.0 && mMultiplierY[index] != -1.0);
}
bool
EventStateManager::WheelPrefs::HasUserPrefsForDelta(WidgetWheelEvent* aEvent)
{
Index index = GetIndexFor(aEvent);
Init(index);
return mMultiplierX[index] != 1.0 ||
mMultiplierY[index] != 1.0;
}
bool
EventStateManager::WheelEventIsScrollAction(WidgetWheelEvent* aEvent)
{
return WheelPrefs::GetInstance()->ComputeActionFor(aEvent) == WheelPrefs::ACTION_SCROLL;
}
bool
EventStateManager::WheelEventNeedsDeltaMultipliers(WidgetWheelEvent* aEvent)
{
return WheelPrefs::GetInstance()->HasUserPrefsForDelta(aEvent);
}
bool
EventStateManager::WheelPrefs::IsOverOnePageScrollAllowedX(
WidgetWheelEvent* aEvent)
{
Index index = GetIndexFor(aEvent);
Init(index);
return Abs(mMultiplierX[index]) >=
MIN_MULTIPLIER_VALUE_ALLOWING_OVER_ONE_PAGE_SCROLL;
}
bool
EventStateManager::WheelPrefs::IsOverOnePageScrollAllowedY(
WidgetWheelEvent* aEvent)
{
Index index = GetIndexFor(aEvent);
Init(index);
return Abs(mMultiplierY[index]) >=
MIN_MULTIPLIER_VALUE_ALLOWING_OVER_ONE_PAGE_SCROLL;
}
/******************************************************************/
/* mozilla::EventStateManager::Prefs */
/******************************************************************/
bool EventStateManager::Prefs::sKeyCausesActivation = true;
bool EventStateManager::Prefs::sClickHoldContextMenu = false;
int32_t EventStateManager::Prefs::sGenericAccessModifierKey = -1;
int32_t EventStateManager::Prefs::sChromeAccessModifierMask = 0;
int32_t EventStateManager::Prefs::sContentAccessModifierMask = 0;
// static
void
EventStateManager::Prefs::Init()
{
DebugOnly<nsresult> rv = Preferences::RegisterCallback(OnChange, "dom.popup_allowed_events");
MOZ_ASSERT(NS_SUCCEEDED(rv),
"Failed to observe \"dom.popup_allowed_events\"");
static bool sPrefsAlreadyCached = false;
if (sPrefsAlreadyCached) {
return;
}
rv = Preferences::AddBoolVarCache(&sKeyCausesActivation,
"accessibility.accesskeycausesactivation",
sKeyCausesActivation);
MOZ_ASSERT(NS_SUCCEEDED(rv),
"Failed to observe \"accessibility.accesskeycausesactivation\"");
rv = Preferences::AddBoolVarCache(&sClickHoldContextMenu,
"ui.click_hold_context_menus",
sClickHoldContextMenu);
MOZ_ASSERT(NS_SUCCEEDED(rv),
"Failed to observe \"ui.click_hold_context_menus\"");
rv = Preferences::AddIntVarCache(&sGenericAccessModifierKey,
"ui.key.generalAccessKey",
sGenericAccessModifierKey);
MOZ_ASSERT(NS_SUCCEEDED(rv),
"Failed to observe \"ui.key.generalAccessKey\"");
rv = Preferences::AddIntVarCache(&sChromeAccessModifierMask,
"ui.key.chromeAccess",
sChromeAccessModifierMask);
MOZ_ASSERT(NS_SUCCEEDED(rv),
"Failed to observe \"ui.key.chromeAccess\"");
rv = Preferences::AddIntVarCache(&sContentAccessModifierMask,
"ui.key.contentAccess",
sContentAccessModifierMask);
MOZ_ASSERT(NS_SUCCEEDED(rv),
"Failed to observe \"ui.key.contentAccess\"");
sPrefsAlreadyCached = true;
}
// static
void
EventStateManager::Prefs::OnChange(const char* aPrefName, void*)
{
nsDependentCString prefName(aPrefName);
if (prefName.EqualsLiteral("dom.popup_allowed_events")) {
Event::PopupAllowedEventsChanged();
}
}
// static
void
EventStateManager::Prefs::Shutdown()
{
Preferences::UnregisterCallback(OnChange, "dom.popup_allowed_events");
}
// static
int32_t
EventStateManager::Prefs::ChromeAccessModifierMask()
{
return GetAccessModifierMask(nsIDocShellTreeItem::typeChrome);
}
// static
int32_t
EventStateManager::Prefs::ContentAccessModifierMask()
{
return GetAccessModifierMask(nsIDocShellTreeItem::typeContent);
}
// static
int32_t
EventStateManager::Prefs::GetAccessModifierMask(int32_t aItemType)
{
switch (sGenericAccessModifierKey) {
case -1: break; // use the individual prefs
case nsIDOMKeyEvent::DOM_VK_SHIFT: return NS_MODIFIER_SHIFT;
case nsIDOMKeyEvent::DOM_VK_CONTROL: return NS_MODIFIER_CONTROL;
case nsIDOMKeyEvent::DOM_VK_ALT: return NS_MODIFIER_ALT;
case nsIDOMKeyEvent::DOM_VK_META: return NS_MODIFIER_META;
case nsIDOMKeyEvent::DOM_VK_WIN: return NS_MODIFIER_OS;
default: return 0;
}
switch (aItemType) {
case nsIDocShellTreeItem::typeChrome:
return sChromeAccessModifierMask;
case nsIDocShellTreeItem::typeContent:
return sContentAccessModifierMask;
default:
return 0;
}
}
/******************************************************************/
/* mozilla::AutoHandlingUserInputStatePusher */
/******************************************************************/
AutoHandlingUserInputStatePusher::AutoHandlingUserInputStatePusher(
bool aIsHandlingUserInput,
WidgetEvent* aEvent,
nsIDocument* aDocument) :
mIsHandlingUserInput(aIsHandlingUserInput),
mIsMouseDown(aEvent && aEvent->message == NS_MOUSE_BUTTON_DOWN),
mResetFMMouseButtonHandlingState(false)
{
if (!aIsHandlingUserInput) {
return;
}
EventStateManager::StartHandlingUserInput();
if (mIsMouseDown) {
nsIPresShell::SetCapturingContent(nullptr, 0);
nsIPresShell::AllowMouseCapture(true);
}
if (!aDocument || !aEvent || !aEvent->mFlags.mIsTrusted) {
return;
}
mResetFMMouseButtonHandlingState = (aEvent->message == NS_MOUSE_BUTTON_DOWN ||
aEvent->message == NS_MOUSE_BUTTON_UP);
if (mResetFMMouseButtonHandlingState) {
nsFocusManager* fm = nsFocusManager::GetFocusManager();
NS_ENSURE_TRUE_VOID(fm);
// If it's in modal state, mouse button event handling may be nested.
// E.g., a modal dialog is opened at mousedown or mouseup event handler
// and the dialog is clicked. Therefore, we should store current
// mouse button event handling document if nsFocusManager already has it.
mMouseButtonEventHandlingDocument =
fm->SetMouseButtonHandlingDocument(aDocument);
}
}
AutoHandlingUserInputStatePusher::~AutoHandlingUserInputStatePusher()
{
if (!mIsHandlingUserInput) {
return;
}
EventStateManager::StopHandlingUserInput();
if (mIsMouseDown) {
nsIPresShell::AllowMouseCapture(false);
}
if (mResetFMMouseButtonHandlingState) {
nsFocusManager* fm = nsFocusManager::GetFocusManager();
NS_ENSURE_TRUE_VOID(fm);
nsCOMPtr<nsIDocument> handlingDocument =
fm->SetMouseButtonHandlingDocument(mMouseButtonEventHandlingDocument);
}
}
} // namespace mozilla
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