cc/layers/solid_color_scrollbar_layer.h

// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CC_LAYERS_SOLID_COLOR_SCROLLBAR_LAYER_H_
#define CC_LAYERS_SOLID_COLOR_SCROLLBAR_LAYER_H_

#include "base/macros.h"
#include "cc/base/cc_export.h"
#include "cc/layers/layer.h"
#include "cc/layers/scrollbar_layer_interface.h"

namespace cc {

class CC_EXPORT SolidColorScrollbarLayer : public ScrollbarLayerInterface,
                                           public Layer {
 public:
  std::unique_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;

  static scoped_refptr<SolidColorScrollbarLayer> Create(
      ScrollbarOrientation orientation,
      int thumb_thickness,
      int track_start,
      bool is_left_side_vertical_scrollbar,
      int scroll_layer_id);

  // Layer overrides.
  bool OpacityCanAnimateOnImplThread() const override;
  bool AlwaysUseActiveTreeOpacity() const override;
  ScrollbarLayerInterface* ToScrollbarLayer() override;

  void SetOpacity(float opacity) override;
  void PushPropertiesTo(LayerImpl* layer) override;

  void SetNeedsDisplayRect(const gfx::Rect& rect) override;

  // ScrollbarLayerInterface
  int ScrollLayerId() const override;
  void SetScrollLayer(int layer_id) override;

  ScrollbarOrientation orientation() const override;

 protected:
  SolidColorScrollbarLayer(ScrollbarOrientation orientation,
                           int thumb_thickness,
                           int track_start,
                           bool is_left_side_vertical_scrollbar,
                           int scroll_layer_id);
  ~SolidColorScrollbarLayer() override;

  // Layer overrides for proto conversions.
  void SetTypeForProtoSerialization(proto::LayerNode* proto) const override;
  void LayerSpecificPropertiesToProto(proto::LayerProperties* proto) override;
  void FromLayerSpecificPropertiesProto(
      const proto::LayerProperties& proto) override;

 private:
  friend class LayerSerializationTest;

  // Encapsulate all data, callbacks, interfaces received from the embedder.
  struct SolidColorScrollbarLayerInputs {
    SolidColorScrollbarLayerInputs(ScrollbarOrientation orientation,
                                   int thumb_thickness,
                                   int track_start,
                                   bool is_left_side_vertical_scrollbar,
                                   int scroll_layer_id);
    ~SolidColorScrollbarLayerInputs();

    int scroll_layer_id;
    ScrollbarOrientation orientation;
    int thumb_thickness;
    int track_start;
    bool is_left_side_vertical_scrollbar;
  };

  SolidColorScrollbarLayerInputs solid_color_scrollbar_layer_inputs_;

  DISALLOW_COPY_AND_ASSIGN(SolidColorScrollbarLayer);
};

}  // namespace cc

#endif  // CC_LAYERS_SOLID_COLOR_SCROLLBAR_LAYER_H_