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// Copyright 2016 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_PAINTED_OVERLAY_SCROLLBAR_LAYER_H_
#define CC_LAYERS_PAINTED_OVERLAY_SCROLLBAR_LAYER_H_
#include "base/macros.h"
#include "cc/cc_export.h"
#include "cc/input/scrollbar.h"
#include "cc/layers/layer.h"
#include "cc/layers/scrollbar_layer_interface.h"
#include "cc/layers/scrollbar_theme_painter.h"
#include "cc/resources/scoped_ui_resource.h"
namespace cc {
class CC_EXPORT PaintedOverlayScrollbarLayer : public ScrollbarLayerInterface,
public Layer {
public:
std::unique_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
static scoped_refptr<PaintedOverlayScrollbarLayer> Create(
std::unique_ptr<Scrollbar> scrollbar,
ElementId scroll_element_id = ElementId());
bool OpacityCanAnimateOnImplThread() const override;
bool AlwaysUseActiveTreeOpacity() const override;
ScrollbarLayerInterface* ToScrollbarLayer() override;
// ScrollbarLayerInterface
ElementId scroll_element_id() const override;
void SetScrollElementId(ElementId element_id) override;
ScrollbarOrientation orientation() const override;
// Layer interface
bool Update() override;
void SetLayerTreeHost(LayerTreeHost* host) override;
void PushPropertiesTo(LayerImpl* layer) override;
protected:
PaintedOverlayScrollbarLayer(std::unique_ptr<Scrollbar> scrollbar,
ElementId scroll_element_id);
~PaintedOverlayScrollbarLayer() override;
private:
gfx::Rect OriginThumbRectForPainting() const;
template <typename T>
bool UpdateProperty(T value, T* prop) {
if (*prop == value)
return false;
*prop = value;
SetNeedsPushProperties();
return true;
}
bool PaintThumbIfNeeded();
std::unique_ptr<Scrollbar> scrollbar_;
ElementId scroll_element_id_;
int thumb_thickness_;
int thumb_length_;
gfx::Point location_;
gfx::Rect track_rect_;
gfx::Rect aperture_;
std::unique_ptr<ScopedUIResource> thumb_resource_;
DISALLOW_COPY_AND_ASSIGN(PaintedOverlayScrollbarLayer);
};
} // namespace cc
#endif // CC_LAYERS_PAINTED_OVERLAY_SCROLLBAR_LAYER_H_