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/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 Layer {
  21  public:
  22   scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
  23
  24   static scoped_refptr<PaintedScrollbarLayer> Create(
  25       scoped_ptr<Scrollbar> scrollbar,
  26       int scroll_layer_id);
  27
  28   bool OpacityCanAnimateOnImplThread() const override;
  29   ScrollbarLayerInterface* ToScrollbarLayer() override;
  30
  31   // ScrollbarLayerInterface
  32   int ScrollLayerId() const override;
  33   void SetScrollLayer(int layer_id) override;
  34   void SetClipLayer(int layer_id) override;
  35
  36   ScrollbarOrientation orientation() const override;
  37
  38   // Layer interface
  39   bool Update(ResourceUpdateQueue* queue,
  40               const OcclusionTracker<Layer>* occlusion) override;
  41   void SetLayerTreeHost(LayerTreeHost* host) override;
  42   void PushPropertiesTo(LayerImpl* layer) override;
  43   void PushScrollClipPropertiesTo(LayerImpl* layer) override;
  44
  45   const gfx::Size& internal_content_bounds() const {
  46     return internal_content_bounds_;
  47   }
  48
  49  protected:
  50   PaintedScrollbarLayer(scoped_ptr<Scrollbar> scrollbar, int scroll_layer_id);
  51   ~PaintedScrollbarLayer() override;
  52
  53   // For unit tests
  54   UIResourceId track_resource_id() {
  55     return track_resource_.get() ? track_resource_->id() : 0;
  56   }
  57   UIResourceId thumb_resource_id() {
  58     return thumb_resource_.get() ? thumb_resource_->id() : 0;
  59   }
  60   void UpdateInternalContentScale();
  61   void UpdateThumbAndTrackGeometry();
  62
  63  private:
  64   gfx::Rect ScrollbarLayerRectToContentRect(const gfx::Rect& layer_rect) const;
  65   gfx::Rect OriginThumbRect() const;
  66
  67   template <typename T>
  68   bool UpdateProperty(T value, T* prop) {
  69     if (*prop == value)
  70       return false;
  71     *prop = value;
  72     SetNeedsPushProperties();
  73     return true;
  74   }
  75
  76   int MaxTextureSize();
  77   float ClampScaleToMaxTextureSize(float scale);
  78
  79   UIResourceBitmap RasterizeScrollbarPart(const gfx::Rect& layer_rect,
  80                                           const gfx::Rect& content_rect,
  81                                           ScrollbarPart part);
  82
  83   scoped_ptr<Scrollbar> scrollbar_;
  84   int scroll_layer_id_;
  85   int clip_layer_id_;
  86
  87   float internal_contents_scale_;
  88   gfx::Size internal_content_bounds_;
  89
  90   // Snapshot of properties taken in UpdateThumbAndTrackGeometry and used in
  91   // PushPropertiesTo.
  92   int thumb_thickness_;
  93   int thumb_length_;
  94   gfx::Point location_;
  95   gfx::Rect track_rect_;
  96   bool is_overlay_;
  97   bool has_thumb_;
  98
  99   scoped_ptr<ScopedUIResource> track_resource_;
 100   scoped_ptr<ScopedUIResource> thumb_resource_;
 101
 102   DISALLOW_COPY_AND_ASSIGN(PaintedScrollbarLayer);
 103 };
 104
 105 }  // namespace cc
 106
 107 #endif  // CC_LAYERS_PAINTED_SCROLLBAR_LAYER_H_