dom/ipc/CoalescedMouseData.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6 #include "base/basictypes.h"
   7
   8 #include "CoalescedMouseData.h"
   9 #include "BrowserChild.h"
  10
  11 #include "mozilla/PresShell.h"
  12 #include "mozilla/StaticPrefs_dom.h"
  13 #include "nsRefreshDriver.h"
  14
  15 using namespace mozilla;
  16 using namespace mozilla::dom;
  17
  18 void CoalescedMouseData::Coalesce(const WidgetMouseEvent& aEvent,
  19                                   const ScrollableLayerGuid& aGuid,
  20                                   const uint64_t& aInputBlockId) {
  21   if (IsEmpty()) {
  22     mCoalescedInputEvent = MakeUnique<WidgetMouseEvent>(aEvent);
  23     mGuid = aGuid;
  24     mInputBlockId = aInputBlockId;
  25     MOZ_ASSERT(!mCoalescedInputEvent->mCoalescedWidgetEvents);
  26   } else {
  27     MOZ_ASSERT(mGuid == aGuid);
  28     MOZ_ASSERT(mInputBlockId == aInputBlockId);
  29     MOZ_ASSERT(mCoalescedInputEvent->mModifiers == aEvent.mModifiers);
  30     MOZ_ASSERT(mCoalescedInputEvent->mReason == aEvent.mReason);
  31     MOZ_ASSERT(mCoalescedInputEvent->mInputSource == aEvent.mInputSource);
  32     MOZ_ASSERT(mCoalescedInputEvent->mButton == aEvent.mButton);
  33     MOZ_ASSERT(mCoalescedInputEvent->mButtons == aEvent.mButtons);
  34     mCoalescedInputEvent->mTimeStamp = aEvent.mTimeStamp;
  35     mCoalescedInputEvent->mRefPoint = aEvent.mRefPoint;
  36     mCoalescedInputEvent->mPressure = aEvent.mPressure;
  37     mCoalescedInputEvent->AssignPointerHelperData(aEvent);
  38   }
  39
  40   if (aEvent.mMessage == eMouseMove) {
  41     // PointerEvent::getCoalescedEvents is only applied to pointermove events.
  42     if (!mCoalescedInputEvent->mCoalescedWidgetEvents) {
  43       mCoalescedInputEvent->mCoalescedWidgetEvents =
  44           new WidgetPointerEventHolder();
  45     }
  46     // Append current event in mCoalescedWidgetEvents. We use them to generate
  47     // DOM events when content calls PointerEvent::getCoalescedEvents.
  48     WidgetPointerEvent* event =
  49         mCoalescedInputEvent->mCoalescedWidgetEvents->mEvents.AppendElement(
  50             aEvent);
  51
  52     event->mMessage = ePointerMove;
  53     event->mFlags.mBubbles = false;
  54     event->mFlags.mCancelable = false;
  55   }
  56 }
  57
  58 bool CoalescedMouseData::CanCoalesce(const WidgetMouseEvent& aEvent,
  59                                      const ScrollableLayerGuid& aGuid,
  60                                      const uint64_t& aInputBlockId) {
  61   MOZ_ASSERT(aEvent.mMessage == eMouseMove);
  62   return !mCoalescedInputEvent ||
  63          (!mCoalescedInputEvent->mFlags.mIsSynthesizedForTests &&
  64           !aEvent.mFlags.mIsSynthesizedForTests &&
  65           mCoalescedInputEvent->mModifiers == aEvent.mModifiers &&
  66           mCoalescedInputEvent->mInputSource == aEvent.mInputSource &&
  67           mCoalescedInputEvent->pointerId == aEvent.pointerId &&
  68           mCoalescedInputEvent->mButton == aEvent.mButton &&
  69           mCoalescedInputEvent->mButtons == aEvent.mButtons && mGuid == aGuid &&
  70           mInputBlockId == aInputBlockId);
  71 }
  72
  73 CoalescedMouseMoveFlusher::CoalescedMouseMoveFlusher(
  74     BrowserChild* aBrowserChild)
  75     : CoalescedInputFlusher(aBrowserChild) {}
  76
  77 void CoalescedMouseMoveFlusher::WillRefresh(mozilla::TimeStamp aTime) {
  78   MOZ_ASSERT(mRefreshDriver);
  79   mBrowserChild->FlushAllCoalescedMouseData();
  80   mBrowserChild->ProcessPendingCoalescedMouseDataAndDispatchEvents();
  81 }
  82
  83 CoalescedMouseMoveFlusher::~CoalescedMouseMoveFlusher() { RemoveObserver(); }