cc/layers/painted_scrollbar_layer.h

   1 // Copyright 2013 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 #ifndef CC_LAYERS_PAINTED_SCROLLBAR_LAYER_H_
   6 #define CC_LAYERS_PAINTED_SCROLLBAR_LAYER_H_
   7
   8 #include "cc/base/cc_export.h"
   9 #include "cc/input/scrollbar.h"
  10 #include "cc/layers/contents_scaling_layer.h"
  11 #include "cc/layers/scrollbar_layer_interface.h"
  12 #include "cc/layers/scrollbar_theme_painter.h"
  13 #include "cc/resources/layer_updater.h"
  14 #include "cc/resources/scoped_ui_resource.h"
  15
  16 namespace cc {
  17 class ScrollbarThemeComposite;
  18
  19 class CC_EXPORT PaintedScrollbarLayer : public ScrollbarLayerInterface,
  20                                         public ContentsScalingLayer {
  21  public:
  22   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
  23       OVERRIDE;
  24
  25   static scoped_refptr<PaintedScrollbarLayer> Create(
  26       scoped_ptr<Scrollbar> scrollbar,
  27       int scroll_layer_id);
  28
  29   virtual bool OpacityCanAnimateOnImplThread() const OVERRIDE;
  30   virtual ScrollbarLayerInterface* ToScrollbarLayer() OVERRIDE;
  31
  32   // ScrollbarLayerInterface
  33   virtual int ScrollLayerId() const OVERRIDE;
  34   virtual void SetScrollLayer(int layer_id) OVERRIDE;
  35   virtual void SetClipLayer(int layer_id) OVERRIDE;
  36
  37   virtual ScrollbarOrientation orientation() const OVERRIDE;
  38
  39   // Layer interface
  40   virtual bool Update(ResourceUpdateQueue* queue,
  41                       const OcclusionTracker<Layer>* occlusion) OVERRIDE;
  42   virtual void SetLayerTreeHost(LayerTreeHost* host) OVERRIDE;
  43   virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
  44   virtual void PushScrollClipPropertiesTo(LayerImpl* layer) OVERRIDE;
  45   virtual void CalculateContentsScale(float ideal_contents_scale,
  46                                       float* contents_scale_x,
  47                                       float* contents_scale_y,
  48                                       gfx::Size* content_bounds) OVERRIDE;
  49
  50  protected:
  51   PaintedScrollbarLayer(scoped_ptr<Scrollbar> scrollbar, int scroll_layer_id);
  52   virtual ~PaintedScrollbarLayer();
  53
  54   // For unit tests
  55   UIResourceId track_resource_id() {
  56     return track_resource_.get() ? track_resource_->id() : 0;
  57   }
  58   UIResourceId thumb_resource_id() {
  59     return thumb_resource_.get() ? thumb_resource_->id() : 0;
  60   }
  61   void UpdateThumbAndTrackGeometry();
  62
  63  private:
  64   gfx::Rect ScrollbarLayerRectToContentRect(const gfx::Rect& layer_rect) const;
  65   gfx::Rect OriginThumbRect() const;
  66
  67   template<typename T> void UpdateProperty(T value, T* prop) {
  68     if (*prop == value)
  69       return;
  70     *prop = value;
  71     SetNeedsPushProperties();
  72   }
  73
  74   int MaxTextureSize();
  75   float ClampScaleToMaxTextureSize(float scale);
  76
  77   UIResourceBitmap RasterizeScrollbarPart(const gfx::Rect& layer_rect,
  78                                           const gfx::Rect& content_rect,
  79                                           ScrollbarPart part);
  80
  81   scoped_ptr<Scrollbar> scrollbar_;
  82   int scroll_layer_id_;
  83   int clip_layer_id_;
  84
  85   // Snapshot of properties taken in UpdateThumbAndTrackGeometry and used in
  86   // PushPropertiesTo.
  87   int thumb_thickness_;
  88   int thumb_length_;
  89   gfx::Point location_;
  90   gfx::Rect track_rect_;
  91   bool is_overlay_;
  92   bool has_thumb_;
  93
  94   scoped_ptr<ScopedUIResource> track_resource_;
  95   scoped_ptr<ScopedUIResource> thumb_resource_;
  96
  97   DISALLOW_COPY_AND_ASSIGN(PaintedScrollbarLayer);
  98 };
  99
 100 }  // namespace cc
 101
 102 #endif  // CC_LAYERS_PAINTED_SCROLLBAR_LAYER_H_