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/cc_export.h"
  10 #include "cc/contents_scaling_layer.h"
  11 #include "cc/layer_updater.h"
  12 #include "cc/scrollbar_theme_painter.h"
  13 #include "third_party/WebKit/Source/Platform/chromium/public/WebScrollbar.h"
  14 #include "third_party/WebKit/Source/Platform/chromium/public/WebScrollbarThemeGeometry.h"
  15
  16 namespace cc {
  17 class CachingBitmapContentLayerUpdater;
  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(LayerTreeImpl* treeImpl) OVERRIDE;
  25
  26     static scoped_refptr<ScrollbarLayer> create(
  27         scoped_ptr<WebKit::WebScrollbar>,
  28         scoped_ptr<ScrollbarThemePainter>,
  29         scoped_ptr<WebKit::WebScrollbarThemeGeometry>,
  30         int scrollLayerId);
  31
  32     int scrollLayerId() const { return m_scrollLayerId; }
  33     void setScrollLayerId(int id);
  34
  35     WebKit::WebScrollbar::Orientation orientation() const;
  36
  37     // Layer interface
  38     virtual void setTexturePriorities(const PriorityCalculator&) OVERRIDE;
  39     virtual void update(ResourceUpdateQueue&, const OcclusionTracker*, RenderingStats&) OVERRIDE;
  40     virtual void setLayerTreeHost(LayerTreeHost*) OVERRIDE;
  41     virtual void pushPropertiesTo(LayerImpl*) OVERRIDE;
  42     virtual void calculateContentsScale(
  43         float idealContentsScale,
  44         float* contentsScaleX,
  45         float* contentsScaleY,
  46         gfx::Size* contentBounds) OVERRIDE;
  47
  48     virtual ScrollbarLayer* toScrollbarLayer() OVERRIDE;
  49
  50 protected:
  51     ScrollbarLayer(
  52         scoped_ptr<WebKit::WebScrollbar>,
  53         scoped_ptr<ScrollbarThemePainter>,
  54         scoped_ptr<WebKit::WebScrollbarThemeGeometry>,
  55         int scrollLayerId);
  56     virtual ~ScrollbarLayer();
  57
  58 private:
  59     void updatePart(CachingBitmapContentLayerUpdater*, LayerUpdater::Resource*, const gfx::Rect&, ResourceUpdateQueue&, RenderingStats&);
  60     void createUpdaterIfNeeded();
  61     gfx::Rect scrollbarLayerRectToContentRect(const gfx::Rect& layerRect) const;
  62
  63     bool isDirty() const { return !m_dirtyRect.IsEmpty(); }
  64
  65     int maxTextureSize();
  66     float clampScaleToMaxTextureSize(float scale);
  67
  68     scoped_ptr<WebKit::WebScrollbar> m_scrollbar;
  69     scoped_ptr<ScrollbarThemePainter> m_painter;
  70     scoped_ptr<WebKit::WebScrollbarThemeGeometry> m_geometry;
  71     gfx::Size m_thumbSize;
  72     int m_scrollLayerId;
  73
  74     unsigned m_textureFormat;
  75
  76     gfx::RectF m_dirtyRect;
  77
  78     scoped_refptr<CachingBitmapContentLayerUpdater> m_backTrackUpdater;
  79     scoped_refptr<CachingBitmapContentLayerUpdater> m_foreTrackUpdater;
  80     scoped_refptr<CachingBitmapContentLayerUpdater> m_thumbUpdater;
  81
  82     // All the parts of the scrollbar except the thumb
  83     scoped_ptr<LayerUpdater::Resource> m_backTrack;
  84     scoped_ptr<LayerUpdater::Resource> m_foreTrack;
  85     scoped_ptr<LayerUpdater::Resource> m_thumb;
  86 };
  87
  88 }
  89 #endif  // CC_SCROLLBAR_LAYER_H_