/* -*- 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/. */

#ifndef mozilla_layers_DragMetrics_h

#define mozilla_layers_DragMetrics_h

#include "FrameMetrics.h"

#include "LayersTypes.h"

#include "mozilla/Maybe.h"

namespace IPC {

template <typename T> struct ParamTraits;

} // namespace IPC

namespace mozilla {

namespace layers {

class AsyncDragMetrics {

  friend struct IPC::ParamTraits<mozilla::layers::AsyncDragMetrics>;

public:

  // IPC constructor

  AsyncDragMetrics()

    : mViewId(0)

    , mPresShellId(0)

    , mDragStartSequenceNumber(0)

    , mScrollbarDragOffset(0)

  {}

  AsyncDragMetrics(const FrameMetrics::ViewID& aViewId,

                   uint32_t aPresShellId,

                   uint64_t aDragStartSequenceNumber,

                   CSSCoord aScrollbarDragOffset,

                   ScrollDirection aDirection)

    : mViewId(aViewId)

    , mPresShellId(aPresShellId)

    , mDragStartSequenceNumber(aDragStartSequenceNumber)

    , mScrollbarDragOffset(aScrollbarDragOffset)

    , mDirection(Some(aDirection))

  {}

  FrameMetrics::ViewID mViewId;

  uint32_t mPresShellId;

  uint64_t mDragStartSequenceNumber;

  CSSCoord mScrollbarDragOffset;  // relative to the thumb's start offset

  Maybe<ScrollDirection> mDirection;

};

}

}

#endif