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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(QuadSink* quad_sink,
     34                            AppendQuadsData* append_quads_data) OVERRIDE;
     35 
     36   void SetThumbThickness(int thumb_thickness);
     37   void SetThumbLength(int thumb_length);
     38   void SetTrackStart(int track_start);
     39   void SetTrackLength(int track_length);
     40 
     41   void set_track_ui_resource_id(UIResourceId uid) {
     42     track_ui_resource_id_ = uid;
     43   }
     44   void set_thumb_ui_resource_id(UIResourceId uid) {
     45     thumb_ui_resource_id_ = uid;
     46   }
     47 
     48  protected:
     49   PaintedScrollbarLayerImpl(LayerTreeImpl* tree_impl,
     50                             int id,
     51                             ScrollbarOrientation orientation);
     52 
     53   // ScrollbarLayerImplBase implementation.
     54   virtual int ThumbThickness() const OVERRIDE;
     55   virtual int ThumbLength() const OVERRIDE;
     56   virtual float TrackLength() const OVERRIDE;
     57   virtual int TrackStart() const OVERRIDE;
     58   virtual bool IsThumbResizable() const OVERRIDE;
     59 
     60  private:
     61   virtual const char* LayerTypeAsString() const OVERRIDE;
     62 
     63   UIResourceId track_ui_resource_id_;
     64   UIResourceId thumb_ui_resource_id_;
     65 
     66   int thumb_thickness_;
     67   int thumb_length_;
     68   int track_start_;
     69   int track_length_;
     70 
     71   // Difference between the clip layer's height and the visible viewport
     72   // height (which may differ in the presence of top-controls hiding).
     73   float vertical_adjust_;
     74 
     75   int scroll_layer_id_;
     76 
     77   DISALLOW_COPY_AND_ASSIGN(PaintedScrollbarLayerImpl);
     78 };
     79 
     80 }  // namespace cc
     81 #endif  // CC_LAYERS_PAINTED_SCROLLBAR_LAYER_IMPL_H_
     82