cc/scrollbar_layer.h

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5
   6 #ifndef CC_SCROLLBAR_LAYER_H_
   7 #define CC_SCROLLBAR_LAYER_H_
   8
   9 #include "cc/caching_bitmap_content_layer_updater.h"
  10 #include "cc/cc_export.h"
  11 #include "cc/contents_scaling_layer.h"
  12 #include <public/WebScrollbar.h>
  13 #include <public/WebScrollbarThemeGeometry.h>
  14 #include <public/WebScrollbarThemePainter.h>
  15
  16 namespace cc {
  17
  18 class ResourceUpdateQueue;
  19 class Scrollbar;
  20 class ScrollbarThemeComposite;
  21
  22 class CC_EXPORT ScrollbarLayer : public ContentsScalingLayer {
  23 public:
  24     virtual scoped_ptr<LayerImpl> createLayerImpl() OVERRIDE;
  25
  26     static scoped_refptr<ScrollbarLayer> create(scoped_ptr<WebKit::WebScrollbar>, WebKit::WebScrollbarThemePainter, scoped_ptr<WebKit::WebScrollbarThemeGeometry>, int scrollLayerId);
  27
  28     // Layer interface
  29     virtual void setTexturePriorities(const PriorityCalculator&) OVERRIDE;
  30     virtual void update(ResourceUpdateQueue&, const OcclusionTracker*, RenderingStats&) OVERRIDE;
  31     virtual void setLayerTreeHost(LayerTreeHost*) OVERRIDE;
  32     virtual void pushPropertiesTo(LayerImpl*) OVERRIDE;
  33     virtual void setContentsScale(float contentsScale) OVERRIDE;
  34
  35     int scrollLayerId() const { return m_scrollLayerId; }
  36     void setScrollLayerId(int id) { m_scrollLayerId = id; }
  37
  38     virtual ScrollbarLayer* toScrollbarLayer() OVERRIDE;
  39
  40 protected:
  41     ScrollbarLayer(scoped_ptr<WebKit::WebScrollbar>, WebKit::WebScrollbarThemePainter, scoped_ptr<WebKit::WebScrollbarThemeGeometry>, int scrollLayerId);
  42     virtual ~ScrollbarLayer();
  43
  44 private:
  45     void updatePart(CachingBitmapContentLayerUpdater*, LayerUpdater::Resource*, const gfx::Rect&, ResourceUpdateQueue&, RenderingStats&);
  46     void createUpdaterIfNeeded();
  47     gfx::Rect scrollbarLayerRectToContentRect(const gfx::Rect& layerRect) const;
  48
  49     int maxTextureSize();
  50     float clampScaleToMaxTextureSize(float scale);
  51
  52     scoped_ptr<WebKit::WebScrollbar> m_scrollbar;
  53     WebKit::WebScrollbarThemePainter m_painter;
  54     scoped_ptr<WebKit::WebScrollbarThemeGeometry> m_geometry;
  55     int m_scrollLayerId;
  56
  57     GLenum m_textureFormat;
  58
  59     scoped_refptr<CachingBitmapContentLayerUpdater> m_backTrackUpdater;
  60     scoped_refptr<CachingBitmapContentLayerUpdater> m_foreTrackUpdater;
  61     scoped_refptr<CachingBitmapContentLayerUpdater> m_thumbUpdater;
  62
  63     // All the parts of the scrollbar except the thumb
  64     scoped_ptr<LayerUpdater::Resource> m_backTrack;
  65     scoped_ptr<LayerUpdater::Resource> m_foreTrack;
  66     scoped_ptr<LayerUpdater::Resource> m_thumb;
  67 };
  68
  69 }
  70 #endif  // CC_SCROLLBAR_LAYER_H_