/* -*- 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 "base/basictypes.h"

#include "CoalescedWheelData.h"

using namespace mozilla;

using namespace mozilla::dom;

void

CoalescedWheelData::Coalesce(const WidgetWheelEvent& aEvent,

                             const ScrollableLayerGuid& aGuid,

                             const uint64_t& aInputBlockId)

{

  if (IsEmpty()) {

    mCoalescedInputEvent = MakeUnique<WidgetWheelEvent>(aEvent);

    mGuid = aGuid;

    mInputBlockId = aInputBlockId;

  } else {

    MOZ_ASSERT(mGuid == aGuid);

    MOZ_ASSERT(mInputBlockId == aInputBlockId);

    MOZ_ASSERT(mCoalescedInputEvent->mModifiers == aEvent.mModifiers);

    MOZ_ASSERT(mCoalescedInputEvent->mDeltaMode == aEvent.mDeltaMode);

    MOZ_ASSERT(mCoalescedInputEvent->mCanTriggerSwipe ==

               aEvent.mCanTriggerSwipe);

    mCoalescedInputEvent->mDeltaX += aEvent.mDeltaX;

    mCoalescedInputEvent->mDeltaY += aEvent.mDeltaY;

    mCoalescedInputEvent->mDeltaZ += aEvent.mDeltaZ;

    mCoalescedInputEvent->mLineOrPageDeltaX += aEvent.mLineOrPageDeltaX;

    mCoalescedInputEvent->mLineOrPageDeltaY += aEvent.mLineOrPageDeltaY;

    mCoalescedInputEvent->mTimeStamp = aEvent.mTimeStamp;

  }

}

bool

CoalescedWheelData::CanCoalesce(const WidgetWheelEvent& aEvent,

                                const ScrollableLayerGuid& aGuid,

                                const uint64_t& aInputBlockId)

{

  MOZ_ASSERT(!IsEmpty());

  return !mCoalescedInputEvent ||

         (mCoalescedInputEvent->mRefPoint == aEvent.mRefPoint &&

          mCoalescedInputEvent->mModifiers == aEvent.mModifiers &&

          mCoalescedInputEvent->mDeltaMode == aEvent.mDeltaMode &&

          mCoalescedInputEvent->mCanTriggerSwipe == aEvent.mCanTriggerSwipe &&

          mGuid == aGuid &&

          mInputBlockId == aInputBlockId);

}