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// Copyright 2012 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_SCROLLBAR_LAYER_H_
#define CC_LAYERS_SCROLLBAR_LAYER_H_
#include "cc/base/cc_export.h"
#include "cc/layers/contents_scaling_layer.h"
#include "cc/layers/scrollbar_theme_painter.h"
#include "cc/resources/layer_updater.h"
#include "third_party/WebKit/Source/Platform/chromium/public/WebScrollbar.h"
#include "third_party/WebKit/Source/Platform/chromium/public/WebScrollbarThemeGeometry.h"
namespace cc {
class CachingBitmapContentLayerUpdater;
class ResourceUpdateQueue;
class Scrollbar;
class ScrollbarThemeComposite;
class CC_EXPORT ScrollbarLayer : public ContentsScalingLayer {
public:
virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
OVERRIDE;
static scoped_refptr<ScrollbarLayer> Create(
scoped_ptr<WebKit::WebScrollbar> scrollbar,
scoped_ptr<ScrollbarThemePainter> painter,
scoped_ptr<WebKit::WebScrollbarThemeGeometry> geometry,
int scroll_layer_id);
int scroll_layer_id() const { return scroll_layer_id_; }
void SetScrollLayerId(int id);
virtual bool OpacityCanAnimateOnImplThread() const OVERRIDE;
WebKit::WebScrollbar::Orientation Orientation() const;
// Layer interface
virtual void SetTexturePriorities(const PriorityCalculator& priority_calc)
OVERRIDE;
virtual void Update(ResourceUpdateQueue* queue,
const OcclusionTracker* occlusion) OVERRIDE;
virtual void SetLayerTreeHost(LayerTreeHost* host) OVERRIDE;
virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
virtual void CalculateContentsScale(float ideal_contents_scale,
bool animating_transform_to_screen,
float* contents_scale_x,
float* contents_scale_y,
gfx::Size* content_bounds) OVERRIDE;
virtual ScrollbarLayer* ToScrollbarLayer() OVERRIDE;
protected:
ScrollbarLayer(
scoped_ptr<WebKit::WebScrollbar> scrollbar,
scoped_ptr<ScrollbarThemePainter> painter,
scoped_ptr<WebKit::WebScrollbarThemeGeometry> geometry,
int scroll_layer_id);
virtual ~ScrollbarLayer();
private:
void UpdatePart(CachingBitmapContentLayerUpdater* painter,
LayerUpdater::Resource* resource,
gfx::Rect rect,
ResourceUpdateQueue* queue);
void CreateUpdaterIfNeeded();
gfx::Rect ScrollbarLayerRectToContentRect(gfx::Rect layer_rect) const;
bool is_dirty() const { return !dirty_rect_.IsEmpty(); }
int MaxTextureSize();
float ClampScaleToMaxTextureSize(float scale);
scoped_ptr<WebKit::WebScrollbar> scrollbar_;
scoped_ptr<ScrollbarThemePainter> painter_;
scoped_ptr<WebKit::WebScrollbarThemeGeometry> geometry_;
gfx::Size thumb_size_;
int scroll_layer_id_;
unsigned texture_format_;
gfx::RectF dirty_rect_;
scoped_refptr<CachingBitmapContentLayerUpdater> back_track_updater_;
scoped_refptr<CachingBitmapContentLayerUpdater> fore_track_updater_;
scoped_refptr<CachingBitmapContentLayerUpdater> thumb_updater_;
// All the parts of the scrollbar except the thumb
scoped_ptr<LayerUpdater::Resource> back_track_;
scoped_ptr<LayerUpdater::Resource> fore_track_;
scoped_ptr<LayerUpdater::Resource> thumb_;
};
} // namespace cc
#endif // CC_LAYERS_SCROLLBAR_LAYER_H_
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