painted_scrollbar_layer.h revision 424c4d7b64af9d0d8fd9624f381f469654d5e3d2 
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_theme_painter.h"
12#include "cc/resources/layer_updater.h"
13#include "cc/resources/scoped_ui_resource.h"
14
15namespace cc {
16class ScrollbarThemeComposite;
17
18class CC_EXPORT PaintedScrollbarLayer : public ContentsScalingLayer {
19 public:
20  virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
21      OVERRIDE;
22
23  static scoped_refptr<PaintedScrollbarLayer> Create(
24      scoped_ptr<Scrollbar> scrollbar,
25      int scroll_layer_id);
26
27  int scroll_layer_id() const { return scroll_layer_id_; }
28  void SetScrollLayerId(int id);
29
30  virtual bool OpacityCanAnimateOnImplThread() const OVERRIDE;
31
32  ScrollbarOrientation Orientation() const;
33
34  // Layer interface
35  virtual bool Update(ResourceUpdateQueue* queue,
36                      const OcclusionTracker* occlusion) OVERRIDE;
37  virtual void SetLayerTreeHost(LayerTreeHost* host) OVERRIDE;
38  virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
39  virtual void CalculateContentsScale(float ideal_contents_scale,
40                                      float device_scale_factor,
41                                      float page_scale_factor,
42                                      bool animating_transform_to_screen,
43                                      float* contents_scale_x,
44                                      float* contents_scale_y,
45                                      gfx::Size* content_bounds) OVERRIDE;
46
47  virtual PaintedScrollbarLayer* ToScrollbarLayer() OVERRIDE;
48
49 protected:
50  PaintedScrollbarLayer(scoped_ptr<Scrollbar> scrollbar, int scroll_layer_id);
51  virtual ~PaintedScrollbarLayer();
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 UpdateThumbAndTrackGeometry();
61
62 private:
63  gfx::Rect ScrollbarLayerRectToContentRect(gfx::Rect layer_rect) const;
64  gfx::Rect OriginThumbRect() const;
65
66  int MaxTextureSize();
67  float ClampScaleToMaxTextureSize(float scale);
68
69  scoped_refptr<UIResourceBitmap> RasterizeScrollbarPart(gfx::Rect rect,
70                                                         ScrollbarPart part);
71
72  scoped_ptr<Scrollbar> scrollbar_;
73
74  // Snapshot of properties taken in UpdateThumbAndTrackGeometry and used in
75  // PushPropertiesTo.
76  int thumb_thickness_;
77  int thumb_length_;
78  gfx::Point location_;
79  gfx::Rect track_rect_;
80
81  int scroll_layer_id_;
82
83  scoped_ptr<ScopedUIResource> track_resource_;
84  scoped_ptr<ScopedUIResource> thumb_resource_;
85
86  DISALLOW_COPY_AND_ASSIGN(PaintedScrollbarLayer);
87};
88
89}  // namespace cc
90
91#endif  // CC_LAYERS_PAINTED_SCROLLBAR_LAYER_H_
92