third_party/WebKit/Source/core/style/StyleScrollSnapData.h

/*
 * Copyright (C) 2014 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef StyleScrollSnapData_h
#define StyleScrollSnapData_h

#include "core/style/ComputedStyleConstants.h"
#include "core/style/QuadLengthValue.h"
#include "platform/LengthPoint.h"
#include "platform/wtf/Allocator.h"
#include "platform/wtf/RefCounted.h"
#include "platform/wtf/Vector.h"

namespace blink {

using ScrollPadding = QuadLengthValue;
using ScrollSnapMargin = QuadLengthValue;

struct ScrollSnapType {
  DISALLOW_NEW();

  ScrollSnapType()
      : is_none(true),
        axis(kSnapAxisBoth),
        strictness(kSnapStrictnessProximity) {}

  ScrollSnapType(const ScrollSnapType& other)
      : is_none(other.is_none),
        axis(other.axis),
        strictness(other.strictness) {}

  bool operator==(const ScrollSnapType& other) const {
    return is_none == other.is_none && axis == other.axis &&
           strictness == other.strictness;
  }

  bool operator!=(const ScrollSnapType& other) const {
    return !(*this == other);
  }

  bool is_none;
  SnapAxis axis;
  SnapStrictness strictness;
};

struct ScrollSnapAlign {
  DISALLOW_NEW();

  ScrollSnapAlign()
      : alignmentX(kSnapAlignmentNone), alignmentY(kSnapAlignmentNone) {}

  ScrollSnapAlign(const ScrollSnapAlign& other)
      : alignmentX(other.alignmentX), alignmentY(other.alignmentY) {}

  bool operator==(const ScrollSnapAlign& other) const {
    return alignmentX == other.alignmentX && alignmentY == other.alignmentY;
  }

  bool operator!=(const ScrollSnapAlign& other) const {
    return !(*this == other);
  }

  SnapAlignment alignmentX;
  SnapAlignment alignmentY;
};

class StyleScrollSnapData : public RefCounted<StyleScrollSnapData> {
 public:
  static PassRefPtr<StyleScrollSnapData> Create() {
    return AdoptRef(new StyleScrollSnapData);
  }
  PassRefPtr<StyleScrollSnapData> Copy() {
    return AdoptRef(new StyleScrollSnapData(*this));
  }

  ScrollSnapType type_;
  ScrollSnapAlign align_;
  ScrollPadding padding_;
  ScrollSnapMargin margin_;

 private:
  StyleScrollSnapData();
  StyleScrollSnapData(const StyleScrollSnapData& other);
};

bool operator==(const StyleScrollSnapData&, const StyleScrollSnapData&);
inline bool operator!=(const StyleScrollSnapData& a,
                       const StyleScrollSnapData& b) {
  return !(a == b);
}

}  // namespace blink

#endif  // StyleScrollSnapData_h