/* -*- 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_ScrollStyles_h

#define mozilla_ScrollStyles_h

#include <stdint.h>

#include "nsStyleConsts.h" // for NS_STYLE_SCROLL_SNAP_*

#include "nsStyleCoord.h" // for nsStyleCoord

#include "mozilla/dom/WindowBinding.h"

// Forward declarations

struct nsStyleDisplay;

namespace mozilla {

struct ScrollStyles

{

  // Always one of NS_STYLE_OVERFLOW_SCROLL, NS_STYLE_OVERFLOW_HIDDEN,

  // or NS_STYLE_OVERFLOW_AUTO.

  uint8_t mHorizontal;

  uint8_t mVertical;

  // Always one of NS_STYLE_SCROLL_BEHAVIOR_AUTO or

  // NS_STYLE_SCROLL_BEHAVIOR_SMOOTH

  uint8_t mScrollBehavior;

  mozilla::StyleOverscrollBehavior mOverscrollBehaviorX;

  mozilla::StyleOverscrollBehavior mOverscrollBehaviorY;

  // Always one of NS_STYLE_SCROLL_SNAP_NONE, NS_STYLE_SCROLL_SNAP_MANDATORY,

  // or NS_STYLE_SCROLL_SNAP_PROXIMITY.

  uint8_t mScrollSnapTypeX;

  uint8_t mScrollSnapTypeY;

  nsStyleCoord mScrollSnapPointsX;

  nsStyleCoord mScrollSnapPointsY;

  nsStyleCoord::CalcValue mScrollSnapDestinationX;

  nsStyleCoord::CalcValue mScrollSnapDestinationY;

  ScrollStyles(uint8_t aH, uint8_t aV)

    : mHorizontal(aH), mVertical(aV),

      mScrollBehavior(NS_STYLE_SCROLL_BEHAVIOR_AUTO),

      mOverscrollBehaviorX(StyleOverscrollBehavior::Auto),

      mOverscrollBehaviorY(StyleOverscrollBehavior::Auto),

      mScrollSnapTypeX(NS_STYLE_SCROLL_SNAP_TYPE_NONE),

      mScrollSnapTypeY(NS_STYLE_SCROLL_SNAP_TYPE_NONE),

      mScrollSnapPointsX(nsStyleCoord(eStyleUnit_None)),

      mScrollSnapPointsY(nsStyleCoord(eStyleUnit_None)) {

    mScrollSnapDestinationX.mPercent = 0;

    mScrollSnapDestinationX.mLength = nscoord(0.0f);

    mScrollSnapDestinationX.mHasPercent = false;

    mScrollSnapDestinationY.mPercent = 0;

    mScrollSnapDestinationY.mLength = nscoord(0.0f);

    mScrollSnapDestinationY.mHasPercent = false;

  }

  explicit ScrollStyles(const nsStyleDisplay* aDisplay);

  ScrollStyles(uint8_t aH, uint8_t aV, const nsStyleDisplay* aDisplay);

  bool operator==(const ScrollStyles& aStyles) const {

    return aStyles.mHorizontal == mHorizontal && aStyles.mVertical == mVertical &&

           aStyles.mScrollBehavior == mScrollBehavior &&

           aStyles.mOverscrollBehaviorX == mOverscrollBehaviorX &&

           aStyles.mOverscrollBehaviorY == mOverscrollBehaviorY &&

           aStyles.mScrollSnapTypeX == mScrollSnapTypeX &&

           aStyles.mScrollSnapTypeY == mScrollSnapTypeY &&

           aStyles.mScrollSnapPointsX == mScrollSnapPointsX &&

           aStyles.mScrollSnapPointsY == mScrollSnapPointsY &&

           aStyles.mScrollSnapDestinationX == mScrollSnapDestinationX &&

           aStyles.mScrollSnapDestinationY == mScrollSnapDestinationY;

  }

  bool operator!=(const ScrollStyles& aStyles) const {

    return !(*this == aStyles);

  }

  bool IsHiddenInBothDirections() const {

    return mHorizontal == NS_STYLE_OVERFLOW_HIDDEN &&

           mVertical == NS_STYLE_OVERFLOW_HIDDEN;

  }

  bool IsSmoothScroll(dom::ScrollBehavior aBehavior) const {

    return aBehavior == dom::ScrollBehavior::Smooth ||

             (aBehavior == dom::ScrollBehavior::Auto &&

               mScrollBehavior == NS_STYLE_SCROLL_BEHAVIOR_SMOOTH);

  }

};

} // namespace mozilla

#endif // mozilla_ScrollStyles_h