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Bug 1242690 - Make sure that synthetic mouse events have a reasonable guid so that the callback transform can get unapplied properly. r=botond

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This commit is contained in:
Kartikaya Gupta 2016-01-29 16:31:15 -05:00
parent 6742c1337e
commit 860d3e754d
2 changed files with 15 additions and 0 deletions
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11
layout/base/nsPresShell.cpp
View File

@ -183,6 +183,7 @@
#include "nsSubDocumentFrame.h"
#include "nsQueryObject.h"
#include "nsLayoutStylesheetCache.h"
#include "mozilla/layers/InputAPZContext.h"
#ifdef ANDROID
#include "nsIDocShellTreeOwner.h"
@ -5454,6 +5455,13 @@ PresShell::ProcessSynthMouseMoveEvent(bool aFromScroll)
nsCOMPtr<nsIPresShell> shell = pointVM->GetPresShell();
if (shell) {
// Since this gets run in a refresh tick there isn't an InputAPZContext on
// the stack from the nsBaseWidget. We need to simulate one with at least
// the correct target guid, so that the correct callback transform gets
// applied if this event goes to a child process. The input block id is set
// to 0 because this is a synthetic event which doesn't really belong to any
// input block. Same for the APZ response field.
InputAPZContext apzContext(mMouseEventTargetGuid, 0, nsEventStatus_eIgnore);
shell->DispatchSynthMouseMove(&event, !aFromScroll);
}
@ -6422,9 +6430,11 @@ PresShell::RecordMouseLocation(WidgetGUIEvent* aEvent)
nsView* rootView = mViewManager->GetRootView();
mMouseLocation = nsLayoutUtils::TranslateWidgetToView(mPresContext,
aEvent->widget, aEvent->refPoint, rootView);
mMouseEventTargetGuid = InputAPZContext::GetTargetLayerGuid();
} else {
mMouseLocation =
nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent, rootFrame);
mMouseEventTargetGuid = InputAPZContext::GetTargetLayerGuid();
}
#ifdef DEBUG_MOUSE_LOCATION
if (aEvent->mMessage == eMouseEnterIntoWidget) {
@ -6444,6 +6454,7 @@ PresShell::RecordMouseLocation(WidgetGUIEvent* aEvent)
// this won't matter at all since we'll get the mouse move or enter after
// the mouse exit when the mouse moves from one of our widgets into another.
mMouseLocation = nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
mMouseEventTargetGuid = InputAPZContext::GetTargetLayerGuid();
#ifdef DEBUG_MOUSE_LOCATION
printf("[ps=%p]got mouse exit for %p\n",
this, aEvent->widget);

4
layout/base/nsPresShell.h
View File

@ -779,6 +779,10 @@ protected:
// over our window or there is no last observed mouse location for some
// reason.
nsPoint mMouseLocation;
// This is an APZ state variable that tracks the target guid for the last
// mouse event that was processed (corresponding to mMouseLocation). This is
// needed for the synthetic mouse events.
mozilla::layers::ScrollableLayerGuid mMouseEventTargetGuid;
// mStyleSet owns it but we maintain a ref, may be null
RefPtr<mozilla::CSSStyleSheet> mPrefStyleSheet;