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* 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 device_scale_factor,
  47                                       float page_scale_factor,
  48                                       bool animating_transform_to_screen,
  49                                       float* contents_scale_x,
  50                                       float* contents_scale_y,
  51                                       gfx::Size* content_bounds) OVERRIDE;
  52
  53  protected:
  54   PaintedScrollbarLayer(scoped_ptr<Scrollbar> scrollbar, int scroll_layer_id);
  55   virtual ~PaintedScrollbarLayer();
  56
  57   // For unit tests
  58   UIResourceId track_resource_id() {
  59     return track_resource_.get() ? track_resource_->id() : 0;
  60   }
  61   UIResourceId thumb_resource_id() {
  62     return thumb_resource_.get() ? thumb_resource_->id() : 0;
  63   }
  64   void UpdateThumbAndTrackGeometry();
  65
  66  private:
  67   gfx::Rect ScrollbarLayerRectToContentRect(const gfx::Rect& layer_rect) const;
  68   gfx::Rect OriginThumbRect() const;
  69
  70   template<typename T> void UpdateProperty(T value, T* prop) {
  71     if (*prop == value)
  72       return;
  73     *prop = value;
  74     SetNeedsPushProperties();
  75   }
  76
  77   int MaxTextureSize();
  78   float ClampScaleToMaxTextureSize(float scale);
  79
  80   UIResourceBitmap RasterizeScrollbarPart(const gfx::Rect& layer_rect,
  81                                           const gfx::Rect& content_rect,
  82                                           ScrollbarPart part);
  83
  84   scoped_ptr<Scrollbar> scrollbar_;
  85   int scroll_layer_id_;
  86   int clip_layer_id_;
  87
  88   // Snapshot of properties taken in UpdateThumbAndTrackGeometry and used in
  89   // PushPropertiesTo.
  90   int thumb_thickness_;
  91   int thumb_length_;
  92   gfx::Point location_;
  93   gfx::Rect track_rect_;
  94   bool is_overlay_;
  95   bool has_thumb_;
  96
  97   scoped_ptr<ScopedUIResource> track_resource_;
  98   scoped_ptr<ScopedUIResource> thumb_resource_;
  99
 100   DISALLOW_COPY_AND_ASSIGN(PaintedScrollbarLayer);
 101 };
 102
 103 }  // namespace cc
 104
 105 #endif  // CC_LAYERS_PAINTED_SCROLLBAR_LAYER_H_