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/scoped_ui_resource.h"
  14
  15 namespace cc {
  16 class ScrollbarThemeComposite;
  17
  18 class CC_EXPORT PaintedScrollbarLayer : public ScrollbarLayerInterface,
  19                                         public Layer {
  20  public:
  21   scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
  22
  23   static scoped_refptr<PaintedScrollbarLayer> Create(
  24       const LayerSettings& settings,
  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() override;
  40   void SetLayerTreeHost(LayerTreeHost* host) override;
  41   void PushPropertiesTo(LayerImpl* layer) override;
  42   void PushScrollClipPropertiesTo(LayerImpl* layer) override;
  43
  44   const gfx::Size& internal_content_bounds() const {
  45     return internal_content_bounds_;
  46   }
  47
  48  protected:
  49   PaintedScrollbarLayer(const LayerSettings& settings,
  50                         scoped_ptr<Scrollbar> scrollbar,
  51                         int scroll_layer_id);
  52   ~PaintedScrollbarLayer() override;
  53
  54   // For unit tests
  55   UIResourceId track_resource_id() {
  56     return track_resource_.get() ? track_resource_->id() : 0;
  57   }
  58   UIResourceId thumb_resource_id() {
  59     return thumb_resource_.get() ? thumb_resource_->id() : 0;
  60   }
  61   void UpdateInternalContentScale();
  62   void UpdateThumbAndTrackGeometry();
  63
  64  private:
  65   gfx::Rect ScrollbarLayerRectToContentRect(const gfx::Rect& layer_rect) const;
  66   gfx::Rect OriginThumbRect() const;
  67
  68   template <typename T>
  69   bool UpdateProperty(T value, T* prop) {
  70     if (*prop == value)
  71       return false;
  72     *prop = value;
  73     SetNeedsPushProperties();
  74     return true;
  75   }
  76
  77   int MaxTextureSize();
  78   float ClampScaleToMaxTextureSize(float scale);
  79
  80   UIResourceBitmap RasterizeScrollbarPart(const gfx::Rect& layer_rect,
  81                                           const gfx::Rect& content_rect,
  82                                           ScrollbarPart part);
  83
  84   scoped_ptr<Scrollbar> scrollbar_;
  85   int scroll_layer_id_;
  86   int clip_layer_id_;
  87
  88   float internal_contents_scale_;
  89   gfx::Size internal_content_bounds_;
  90
  91   // Snapshot of properties taken in UpdateThumbAndTrackGeometry and used in
  92   // PushPropertiesTo.
  93   int thumb_thickness_;
  94   int thumb_length_;
  95   gfx::Point location_;
  96   gfx::Rect track_rect_;
  97   bool is_overlay_;
  98   bool has_thumb_;
  99
 100   scoped_ptr<ScopedUIResource> track_resource_;
 101   scoped_ptr<ScopedUIResource> thumb_resource_;
 102
 103   DISALLOW_COPY_AND_ASSIGN(PaintedScrollbarLayer);
 104 };
 105
 106 }  // namespace cc
 107
 108 #endif  // CC_LAYERS_PAINTED_SCROLLBAR_LAYER_H_