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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_IMPL_H_
      6 #define CC_LAYERS_PAINTED_SCROLLBAR_LAYER_IMPL_H_
      7 
      8 #include "cc/base/cc_export.h"
      9 #include "cc/input/scrollbar.h"
     10 #include "cc/layers/scrollbar_layer_impl_base.h"
     11 #include "cc/resources/ui_resource_client.h"
     12 
     13 namespace cc {
     14 
     15 class LayerTreeImpl;
     16 class ScrollView;
     17 
     18 class CC_EXPORT PaintedScrollbarLayerImpl : public ScrollbarLayerImplBase {
     19  public:
     20   static scoped_ptr<PaintedScrollbarLayerImpl> Create(
     21       LayerTreeImpl* tree_impl,
     22       int id,
     23       ScrollbarOrientation orientation);
     24   virtual ~PaintedScrollbarLayerImpl();
     25 
     26   // LayerImpl implementation.
     27   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
     28       OVERRIDE;
     29   virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
     30 
     31   virtual bool WillDraw(DrawMode draw_mode,
     32                         ResourceProvider* resource_provider) OVERRIDE;
     33   virtual void AppendQuads(RenderPass* render_pass,
     34                            const OcclusionTracker<LayerImpl>& occlusion_tracker,
     35                            AppendQuadsData* append_quads_data) OVERRIDE;
     36 
     37   void SetThumbThickness(int thumb_thickness);
     38   void SetThumbLength(int thumb_length);
     39   void SetTrackStart(int track_start);
     40   void SetTrackLength(int track_length);
     41 
     42   void set_track_ui_resource_id(UIResourceId uid) {
     43     track_ui_resource_id_ = uid;
     44   }
     45   void set_thumb_ui_resource_id(UIResourceId uid) {
     46     thumb_ui_resource_id_ = uid;
     47   }
     48 
     49  protected:
     50   PaintedScrollbarLayerImpl(LayerTreeImpl* tree_impl,
     51                             int id,
     52                             ScrollbarOrientation orientation);
     53 
     54   // ScrollbarLayerImplBase implementation.
     55   virtual int ThumbThickness() const OVERRIDE;
     56   virtual int ThumbLength() const OVERRIDE;
     57   virtual float TrackLength() const OVERRIDE;
     58   virtual int TrackStart() const OVERRIDE;
     59   virtual bool IsThumbResizable() const OVERRIDE;
     60 
     61  private:
     62   virtual const char* LayerTypeAsString() const OVERRIDE;
     63 
     64   UIResourceId track_ui_resource_id_;
     65   UIResourceId thumb_ui_resource_id_;
     66 
     67   int thumb_thickness_;
     68   int thumb_length_;
     69   int track_start_;
     70   int track_length_;
     71 
     72   // Difference between the clip layer's height and the visible viewport
     73   // height (which may differ in the presence of top-controls hiding).
     74   float vertical_adjust_;
     75 
     76   int scroll_layer_id_;
     77 
     78   DISALLOW_COPY_AND_ASSIGN(PaintedScrollbarLayerImpl);
     79 };
     80 
     81 }  // namespace cc
     82 #endif  // CC_LAYERS_PAINTED_SCROLLBAR_LAYER_IMPL_H_
     83