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       const LayerSettings& settings,
  26       scoped_ptr<Scrollbar> scrollbar,
  27       int scroll_layer_id);
  28
  29   bool OpacityCanAnimateOnImplThread() const override;
  30   ScrollbarLayerInterface* ToScrollbarLayer() override;
  31
  32   // ScrollbarLayerInterface
  33   int ScrollLayerId() const override;
  34   void SetScrollLayer(int layer_id) override;
  35   void SetClipLayer(int layer_id) override;
  36
  37   ScrollbarOrientation orientation() const override;
  38
  39   // Layer interface
  40   bool Update(ResourceUpdateQueue* queue,
  41               const OcclusionTracker<Layer>* occlusion) override;
  42   void SetLayerTreeHost(LayerTreeHost* host) override;
  43   void PushPropertiesTo(LayerImpl* layer) override;
  44   void PushScrollClipPropertiesTo(LayerImpl* layer) override;
  45
  46   const gfx::Size& internal_content_bounds() const {
  47     return internal_content_bounds_;
  48   }
  49
  50  protected:
  51   PaintedScrollbarLayer(const LayerSettings& settings,
  52                         scoped_ptr<Scrollbar> scrollbar,
  53                         int scroll_layer_id);
  54   ~PaintedScrollbarLayer() override;
  55
  56   // For unit tests
  57   UIResourceId track_resource_id() {
  58     return track_resource_.get() ? track_resource_->id() : 0;
  59   }
  60   UIResourceId thumb_resource_id() {
  61     return thumb_resource_.get() ? thumb_resource_->id() : 0;
  62   }
  63   void UpdateInternalContentScale();
  64   void UpdateThumbAndTrackGeometry();
  65
  66  private:
  67   gfx::Rect ScrollbarLayerRectToContentRect(const gfx::Rect& layer_rect) const;
  68   gfx::Rect OriginThumbRect() const;
  69
  70   template <typename T>
  71   bool UpdateProperty(T value, T* prop) {
  72     if (*prop == value)
  73       return false;
  74     *prop = value;
  75     SetNeedsPushProperties();
  76     return true;
  77   }
  78
  79   int MaxTextureSize();
  80   float ClampScaleToMaxTextureSize(float scale);
  81
  82   UIResourceBitmap RasterizeScrollbarPart(const gfx::Rect& layer_rect,
  83                                           const gfx::Rect& content_rect,
  84                                           ScrollbarPart part);
  85
  86   scoped_ptr<Scrollbar> scrollbar_;
  87   int scroll_layer_id_;
  88   int clip_layer_id_;
  89
  90   float internal_contents_scale_;
  91   gfx::Size internal_content_bounds_;
  92
  93   // Snapshot of properties taken in UpdateThumbAndTrackGeometry and used in
  94   // PushPropertiesTo.
  95   int thumb_thickness_;
  96   int thumb_length_;
  97   gfx::Point location_;
  98   gfx::Rect track_rect_;
  99   bool is_overlay_;
 100   bool has_thumb_;
 101
 102   scoped_ptr<ScopedUIResource> track_resource_;
 103   scoped_ptr<ScopedUIResource> thumb_resource_;
 104
 105   DISALLOW_COPY_AND_ASSIGN(PaintedScrollbarLayer);
 106 };
 107
 108 }  // namespace cc
 109
 110 #endif  // CC_LAYERS_PAINTED_SCROLLBAR_LAYER_H_