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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 SetScrollLayerId(int id) OVERRIDE;
     35 
     36   virtual ScrollbarOrientation orientation() const OVERRIDE;
     37 
     38   // Layer interface
     39   virtual bool Update(ResourceUpdateQueue* queue,
     40                       const OcclusionTracker* occlusion) OVERRIDE;
     41   virtual void SetLayerTreeHost(LayerTreeHost* host) OVERRIDE;
     42   virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
     43   virtual void CalculateContentsScale(float ideal_contents_scale,
     44                                       float device_scale_factor,
     45                                       float page_scale_factor,
     46                                       bool animating_transform_to_screen,
     47                                       float* contents_scale_x,
     48                                       float* contents_scale_y,
     49                                       gfx::Size* content_bounds) OVERRIDE;
     50 
     51  protected:
     52   PaintedScrollbarLayer(scoped_ptr<Scrollbar> scrollbar, int scroll_layer_id);
     53   virtual ~PaintedScrollbarLayer();
     54 
     55   // For unit tests
     56   UIResourceId track_resource_id() {
     57     return track_resource_.get() ? track_resource_->id() : 0;
     58   }
     59   UIResourceId thumb_resource_id() {
     60     return thumb_resource_.get() ? thumb_resource_->id() : 0;
     61   }
     62   void UpdateThumbAndTrackGeometry();
     63 
     64  private:
     65   gfx::Rect ScrollbarLayerRectToContentRect(gfx::Rect layer_rect) const;
     66   gfx::Rect OriginThumbRect() const;
     67 
     68   template<typename T> void UpdateProperty(T value, T* prop) {
     69     if (*prop == value)
     70       return;
     71     *prop = value;
     72     SetNeedsPushProperties();
     73   }
     74 
     75   int MaxTextureSize();
     76   float ClampScaleToMaxTextureSize(float scale);
     77 
     78   UIResourceBitmap RasterizeScrollbarPart(gfx::Rect rect,
     79                                           ScrollbarPart part);
     80 
     81   scoped_ptr<Scrollbar> scrollbar_;
     82   int scroll_layer_id_;
     83 
     84   // Snapshot of properties taken in UpdateThumbAndTrackGeometry and used in
     85   // PushPropertiesTo.
     86   int thumb_thickness_;
     87   int thumb_length_;
     88   gfx::Point location_;
     89   gfx::Rect track_rect_;
     90   bool is_overlay_;
     91   bool has_thumb_;
     92 
     93   scoped_ptr<ScopedUIResource> track_resource_;
     94   scoped_ptr<ScopedUIResource> thumb_resource_;
     95 
     96   DISALLOW_COPY_AND_ASSIGN(PaintedScrollbarLayer);
     97 };
     98 
     99 }  // namespace cc
    100 
    101 #endif  // CC_LAYERS_PAINTED_SCROLLBAR_LAYER_H_
    102