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      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 device_scale_factor,
     47                                       float page_scale_factor,
     48                                       float maximum_animation_contents_scale,
     49                                       bool animating_transform_to_screen,
     50                                       float* contents_scale_x,
     51                                       float* contents_scale_y,
     52                                       gfx::Size* content_bounds) OVERRIDE;
     53 
     54  protected:
     55   PaintedScrollbarLayer(scoped_ptr<Scrollbar> scrollbar, int scroll_layer_id);
     56   virtual ~PaintedScrollbarLayer();
     57 
     58   // For unit tests
     59   UIResourceId track_resource_id() {
     60     return track_resource_.get() ? track_resource_->id() : 0;
     61   }
     62   UIResourceId thumb_resource_id() {
     63     return thumb_resource_.get() ? thumb_resource_->id() : 0;
     64   }
     65   void UpdateThumbAndTrackGeometry();
     66 
     67  private:
     68   gfx::Rect ScrollbarLayerRectToContentRect(const gfx::Rect& layer_rect) const;
     69   gfx::Rect OriginThumbRect() const;
     70 
     71   template<typename T> void UpdateProperty(T value, T* prop) {
     72     if (*prop == value)
     73       return;
     74     *prop = value;
     75     SetNeedsPushProperties();
     76   }
     77 
     78   int MaxTextureSize();
     79   float ClampScaleToMaxTextureSize(float scale);
     80 
     81   UIResourceBitmap RasterizeScrollbarPart(const gfx::Rect& layer_rect,
     82                                           const gfx::Rect& content_rect,
     83                                           ScrollbarPart part);
     84 
     85   scoped_ptr<Scrollbar> scrollbar_;
     86   int scroll_layer_id_;
     87   int clip_layer_id_;
     88 
     89   // Snapshot of properties taken in UpdateThumbAndTrackGeometry and used in
     90   // PushPropertiesTo.
     91   int thumb_thickness_;
     92   int thumb_length_;
     93   gfx::Point location_;
     94   gfx::Rect track_rect_;
     95   bool is_overlay_;
     96   bool has_thumb_;
     97 
     98   scoped_ptr<ScopedUIResource> track_resource_;
     99   scoped_ptr<ScopedUIResource> thumb_resource_;
    100 
    101   DISALLOW_COPY_AND_ASSIGN(PaintedScrollbarLayer);
    102 };
    103 
    104 }  // namespace cc
    105 
    106 #endif  // CC_LAYERS_PAINTED_SCROLLBAR_LAYER_H_
    107