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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/contents_scaling_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 ContentsScalingLayer {
public:
virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
OVERRIDE;
static scoped_refptr<PaintedScrollbarLayer> Create(
scoped_ptr<Scrollbar> scrollbar,
int scroll_layer_id);
virtual bool OpacityCanAnimateOnImplThread() const OVERRIDE;
virtual ScrollbarLayerInterface* ToScrollbarLayer() OVERRIDE;
// ScrollbarLayerInterface
virtual int ScrollLayerId() const OVERRIDE;
virtual void SetScrollLayer(int layer_id) OVERRIDE;
virtual void SetClipLayer(int layer_id) OVERRIDE;
virtual ScrollbarOrientation orientation() const OVERRIDE;
// Layer interface
virtual bool Update(ResourceUpdateQueue* queue,
const OcclusionTracker<Layer>* occlusion) OVERRIDE;
virtual void SetLayerTreeHost(LayerTreeHost* host) OVERRIDE;
virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
virtual void PushScrollClipPropertiesTo(LayerImpl* layer) OVERRIDE;
virtual void CalculateContentsScale(float ideal_contents_scale,
float device_scale_factor,
float page_scale_factor,
float maximum_animation_contents_scale,
bool animating_transform_to_screen,
float* contents_scale_x,
float* contents_scale_y,
gfx::Size* content_bounds) OVERRIDE;
protected:
PaintedScrollbarLayer(scoped_ptr<Scrollbar> scrollbar, int scroll_layer_id);
virtual ~PaintedScrollbarLayer();
// 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 UpdateThumbAndTrackGeometry();
private:
gfx::Rect ScrollbarLayerRectToContentRect(const gfx::Rect& layer_rect) const;
gfx::Rect OriginThumbRect() const;
template<typename T> void UpdateProperty(T value, T* prop) {
if (*prop == value)
return;
*prop = value;
SetNeedsPushProperties();
}
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_;
// 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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