painted_scrollbar_layer.h revision a1401311d1ab56c4ed0a474bd38c108f75cb0cd9 
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/contents_scaling_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
16namespace cc {
17class ScrollbarThemeComposite;
18
19class CC_EXPORT PaintedScrollbarLayer : public ScrollbarLayerInterface,
20                                        public ContentsScalingLayer {
21 public:
22  virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
23      OVERRIDE;
24
25  static scoped_refptr<PaintedScrollbarLayer> Create(
26      scoped_ptr<Scrollbar> scrollbar,
27      int scroll_layer_id);
28
29  virtual bool OpacityCanAnimateOnImplThread() const OVERRIDE;
30  virtual ScrollbarLayerInterface* ToScrollbarLayer() OVERRIDE;
31
32  // ScrollbarLayerInterface
33  virtual int ScrollLayerId() const OVERRIDE;
34  virtual void SetScrollLayer(int layer_id) OVERRIDE;
35  virtual void SetClipLayer(int layer_id) OVERRIDE;
36
37  virtual ScrollbarOrientation orientation() const OVERRIDE;
38
39  // Layer interface
40  virtual bool Update(ResourceUpdateQueue* queue,
41                      const OcclusionTracker<Layer>* occlusion) OVERRIDE;
42  virtual void SetLayerTreeHost(LayerTreeHost* host) OVERRIDE;
43  virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
44  virtual void PushScrollClipPropertiesTo(LayerImpl* layer) OVERRIDE;
45  virtual void CalculateContentsScale(float ideal_contents_scale,
46                                      float device_scale_factor,
47                                      float page_scale_factor,
48                                      bool animating_transform_to_screen,
49                                      float* contents_scale_x,
50                                      float* contents_scale_y,
51                                      gfx::Size* content_bounds) OVERRIDE;
52
53 protected:
54  PaintedScrollbarLayer(scoped_ptr<Scrollbar> scrollbar, int scroll_layer_id);
55  virtual ~PaintedScrollbarLayer();
56
57  // For unit tests
58  UIResourceId track_resource_id() {
59    return track_resource_.get() ? track_resource_->id() : 0;
60  }
61  UIResourceId thumb_resource_id() {
62    return thumb_resource_.get() ? thumb_resource_->id() : 0;
63  }
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> void UpdateProperty(T value, T* prop) {
71    if (*prop == value)
72      return;
73    *prop = value;
74    SetNeedsPushProperties();
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  // Snapshot of properties taken in UpdateThumbAndTrackGeometry and used in
89  // PushPropertiesTo.
90  int thumb_thickness_;
91  int thumb_length_;
92  gfx::Point location_;
93  gfx::Rect track_rect_;
94  bool is_overlay_;
95  bool has_thumb_;
96
97  scoped_ptr<ScopedUIResource> track_resource_;
98  scoped_ptr<ScopedUIResource> thumb_resource_;
99
100  DISALLOW_COPY_AND_ASSIGN(PaintedScrollbarLayer);
101};
102
103}  // namespace cc
104
105#endif  // CC_LAYERS_PAINTED_SCROLLBAR_LAYER_H_
106