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/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,
      ElementId scroll_element_id);

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

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

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

  // ScrollbarLayerInterface
  ElementId scroll_element_id() const override;
  void SetScrollElementId(ElementId element_id) override;

  ScrollbarOrientation orientation() const override;

  int thumb_thickness() const {
    return solid_color_scrollbar_layer_inputs_.thumb_thickness;
  }

  int track_start() const {
    return solid_color_scrollbar_layer_inputs_.track_start;
  }

  bool is_left_side_vertical_scrollbar() const {
    return solid_color_scrollbar_layer_inputs_.is_left_side_vertical_scrollbar;
  }

 protected:
  SolidColorScrollbarLayer(ScrollbarOrientation orientation,
                           int thumb_thickness,
                           int track_start,
                           bool is_left_side_vertical_scrollbar,
                           ElementId scroll_element_id);
  ~SolidColorScrollbarLayer() 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,
                                   ElementId scroll_element_id);
    ~SolidColorScrollbarLayerInputs();

    ElementId scroll_element_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_