/* -*- 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 "CoalescedMouseData.h"

#include "TabChild.h"

using namespace mozilla;

using namespace mozilla::dom;

void

CoalescedMouseData::Coalesce(const WidgetMouseEvent& aEvent,

                             const ScrollableLayerGuid& aGuid,

                             const uint64_t& aInputBlockId)

{

  if (IsEmpty()) {

    mCoalescedInputEvent = MakeUnique<WidgetMouseEvent>(aEvent);

    mGuid = aGuid;

    mInputBlockId = aInputBlockId;

    MOZ_ASSERT(!mCoalescedInputEvent->mCoalescedWidgetEvents);

  } else {

    MOZ_ASSERT(mGuid == aGuid);

    MOZ_ASSERT(mInputBlockId == aInputBlockId);

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

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

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

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

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

    mCoalescedInputEvent->mTimeStamp = aEvent.mTimeStamp;

    mCoalescedInputEvent->mRefPoint = aEvent.mRefPoint;

    mCoalescedInputEvent->pressure = aEvent.pressure;

    mCoalescedInputEvent->AssignPointerHelperData(aEvent);

  }

  if (aEvent.mMessage == eMouseMove &&

      PointerEventHandler::IsPointerEventEnabled()) {

    // PointerEvent::getCoalescedEvents is only applied to pointermove events.

    if (!mCoalescedInputEvent->mCoalescedWidgetEvents) {

      mCoalescedInputEvent->mCoalescedWidgetEvents =

        new WidgetPointerEventHolder();

    }

    // Append current event in mCoalescedWidgetEvents. We use them to generate

    // DOM events when content calls PointerEvent::getCoalescedEvents.

    WidgetPointerEvent* event = mCoalescedInputEvent->mCoalescedWidgetEvents

                                  ->mEvents.AppendElement(aEvent);

    event->mFlags.mBubbles = false;

    event->mFlags.mCancelable = false;

  }

}

bool

CoalescedMouseData::CanCoalesce(const WidgetMouseEvent& aEvent,

                             const ScrollableLayerGuid& aGuid,

                             const uint64_t& aInputBlockId)

{

  MOZ_ASSERT(aEvent.mMessage == eMouseMove);

  return !mCoalescedInputEvent ||

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

          mCoalescedInputEvent->inputSource == aEvent.inputSource &&

          mCoalescedInputEvent->pointerId == aEvent.pointerId &&

          mCoalescedInputEvent->button == aEvent.button &&

          mCoalescedInputEvent->buttons == aEvent.buttons &&

          mGuid == aGuid &&

          mInputBlockId == aInputBlockId);

}

void

CoalescedMouseMoveFlusher::WillRefresh(mozilla::TimeStamp aTime)

{

  MOZ_ASSERT(mRefreshDriver);

  mTabChild->FlushAllCoalescedMouseData();

  mTabChild->ProcessPendingCoalescedMouseDataAndDispatchEvents();

}

void

CoalescedMouseMoveFlusher::StartObserver()

{

  nsRefreshDriver* refreshDriver = GetRefreshDriver();

  if (mRefreshDriver && mRefreshDriver == refreshDriver) {

    // Nothing to do if we already added an observer and it's same refresh driver.

    return;

  }

  RemoveObserver();

  if (refreshDriver) {

    mRefreshDriver = refreshDriver;

    DebugOnly<bool> success =

      mRefreshDriver->AddRefreshObserver(this, FlushType::Event);

    MOZ_ASSERT(success);

  }

}

void

CoalescedMouseMoveFlusher::RemoveObserver()

{

  if (mRefreshDriver) {

    mRefreshDriver->RemoveRefreshObserver(this, FlushType::Event);

    mRefreshDriver = nullptr;

  }

}

nsRefreshDriver*

CoalescedMouseMoveFlusher::GetRefreshDriver()

{

  nsCOMPtr<nsIPresShell> presShell = mTabChild->GetPresShell();

  if (!presShell || !presShell->GetPresContext() ||

      !presShell->GetPresContext()->RefreshDriver()) {

    return nullptr;

  }

  return presShell->GetPresContext()->RefreshDriver();

}