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// 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_PAINTED_SCROLLBAR_LAYER_H_
#define CC_LAYERS_PAINTED_SCROLLBAR_LAYER_H_
#include "cc/base/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/layer_updater.h"
#include "cc/resources/scoped_ui_resource.h"
namespace cc {
class ScrollbarThemeComposite;
class CC_EXPORT PaintedScrollbarLayer : public ScrollbarLayerInterface,
public Layer {
public:
scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
static scoped_refptr<PaintedScrollbarLayer> Create(
const LayerSettings& settings,
scoped_ptr<Scrollbar> scrollbar,
int scroll_layer_id);
bool OpacityCanAnimateOnImplThread() const override;
ScrollbarLayerInterface* ToScrollbarLayer() override;
// ScrollbarLayerInterface
int ScrollLayerId() const override;
void SetScrollLayer(int layer_id) override;
void SetClipLayer(int layer_id) override;
ScrollbarOrientation orientation() const override;
// Layer interface
bool Update(ResourceUpdateQueue* queue) override;
void SetLayerTreeHost(LayerTreeHost* host) override;
void PushPropertiesTo(LayerImpl* layer) override;
void PushScrollClipPropertiesTo(LayerImpl* layer) override;
const gfx::Size& internal_content_bounds() const {
return internal_content_bounds_;
}
protected:
PaintedScrollbarLayer(const LayerSettings& settings,
scoped_ptr<Scrollbar> scrollbar,
int scroll_layer_id);
~PaintedScrollbarLayer() override;
// For unit tests
UIResourceId track_resource_id() {
return track_resource_.get() ? track_resource_->id() : 0;
}
UIResourceId thumb_resource_id() {
return thumb_resource_.get() ? thumb_resource_->id() : 0;
}
void UpdateInternalContentScale();
void UpdateThumbAndTrackGeometry();
private:
gfx::Rect ScrollbarLayerRectToContentRect(const gfx::Rect& layer_rect) const;
gfx::Rect OriginThumbRect() const;
template <typename T>
bool UpdateProperty(T value, T* prop) {
if (*prop == value)
return false;
*prop = value;
SetNeedsPushProperties();
return true;
}
int MaxTextureSize();
float ClampScaleToMaxTextureSize(float scale);
UIResourceBitmap RasterizeScrollbarPart(const gfx::Rect& layer_rect,
const gfx::Rect& content_rect,
ScrollbarPart part);
scoped_ptr<Scrollbar> scrollbar_;
int scroll_layer_id_;
int clip_layer_id_;
float internal_contents_scale_;
gfx::Size internal_content_bounds_;
// Snapshot of properties taken in UpdateThumbAndTrackGeometry and used in
// PushPropertiesTo.
int thumb_thickness_;
int thumb_length_;
gfx::Point location_;
gfx::Rect track_rect_;
bool is_overlay_;
bool has_thumb_;
scoped_ptr<ScopedUIResource> track_resource_;
scoped_ptr<ScopedUIResource> thumb_resource_;
DISALLOW_COPY_AND_ASSIGN(PaintedScrollbarLayer);
};
} // namespace cc
#endif // CC_LAYERS_PAINTED_SCROLLBAR_LAYER_H_
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