dom/ipc/CoalescedWheelData.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 "CoalescedWheelData.h"
   9
  10 using namespace mozilla;
  11 using namespace mozilla::dom;
  12
  13 void CoalescedWheelData::Coalesce(const WidgetWheelEvent& aEvent,
  14                                   const ScrollableLayerGuid& aGuid,
  15                                   const uint64_t& aInputBlockId) {
  16   if (IsEmpty()) {
  17     mCoalescedInputEvent = MakeUnique<WidgetWheelEvent>(aEvent);
  18     mGuid = aGuid;
  19     mInputBlockId = aInputBlockId;
  20   } else {
  21     MOZ_ASSERT(mGuid == aGuid);
  22     MOZ_ASSERT(mInputBlockId == aInputBlockId);
  23     MOZ_ASSERT(mCoalescedInputEvent->mModifiers == aEvent.mModifiers);
  24     MOZ_ASSERT(mCoalescedInputEvent->mDeltaMode == aEvent.mDeltaMode);
  25     MOZ_ASSERT(mCoalescedInputEvent->mCanTriggerSwipe ==
  26                aEvent.mCanTriggerSwipe);
  27     mCoalescedInputEvent->mDeltaX += aEvent.mDeltaX;
  28     mCoalescedInputEvent->mDeltaY += aEvent.mDeltaY;
  29     mCoalescedInputEvent->mDeltaZ += aEvent.mDeltaZ;
  30     mCoalescedInputEvent->mLineOrPageDeltaX += aEvent.mLineOrPageDeltaX;
  31     mCoalescedInputEvent->mLineOrPageDeltaY += aEvent.mLineOrPageDeltaY;
  32     mCoalescedInputEvent->mTimeStamp = aEvent.mTimeStamp;
  33   }
  34 }
  35
  36 bool CoalescedWheelData::CanCoalesce(const WidgetWheelEvent& aEvent,
  37                                      const ScrollableLayerGuid& aGuid,
  38                                      const uint64_t& aInputBlockId) {
  39   MOZ_ASSERT(!IsEmpty());
  40   return !mCoalescedInputEvent ||
  41          (mCoalescedInputEvent->mRefPoint == aEvent.mRefPoint &&
  42           mCoalescedInputEvent->mModifiers == aEvent.mModifiers &&
  43           mCoalescedInputEvent->mDeltaMode == aEvent.mDeltaMode &&
  44           mCoalescedInputEvent->mCanTriggerSwipe == aEvent.mCanTriggerSwipe &&
  45           mGuid == aGuid && mInputBlockId == aInputBlockId);
  46 }