painted_scrollbar_layer_impl.h revision 3551c9c881056c480085172ff9840cab31610854 
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_IMPL_H_
6#define CC_LAYERS_PAINTED_SCROLLBAR_LAYER_IMPL_H_
7
8#include "cc/base/cc_export.h"
9#include "cc/input/scrollbar.h"
10#include "cc/layers/layer_impl.h"
11#include "cc/resources/ui_resource_client.h"
12
13namespace cc {
14
15class LayerTreeImpl;
16class ScrollView;
17
18class CC_EXPORT PaintedScrollbarLayerImpl : public LayerImpl {
19 public:
20  static scoped_ptr<PaintedScrollbarLayerImpl> Create(
21      LayerTreeImpl* tree_impl,
22      int id,
23      ScrollbarOrientation orientation);
24  virtual ~PaintedScrollbarLayerImpl();
25
26  // LayerImpl implementation.
27  virtual PaintedScrollbarLayerImpl* ToScrollbarLayer() OVERRIDE;
28  virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
29      OVERRIDE;
30  virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
31
32  virtual bool WillDraw(DrawMode draw_mode,
33                        ResourceProvider* resource_provider) OVERRIDE;
34  virtual void AppendQuads(QuadSink* quad_sink,
35                           AppendQuadsData* append_quads_data) OVERRIDE;
36
37  int scroll_layer_id() const { return scroll_layer_id_; }
38  void set_scroll_layer_id(int id) { scroll_layer_id_ = id; }
39
40  ScrollbarOrientation Orientation() const;
41  float CurrentPos() const;
42  int Maximum() const;
43
44  void SetThumbThickness(int thumb_thickness);
45  int thumb_thickness() const { return thumb_thickness_; }
46  void SetThumbLength(int thumb_length);
47  void SetTrackStart(int track_start);
48  void SetTrackLength(int track_length);
49  void SetVerticalAdjust(float vertical_adjust);
50  void set_track_ui_resource_id(UIResourceId uid) {
51    track_ui_resource_id_ = uid;
52  }
53  void set_thumb_ui_resource_id(UIResourceId uid) {
54    thumb_ui_resource_id_ = uid;
55  }
56  void SetVisibleToTotalLengthRatio(float ratio);
57  void set_is_overlay_scrollbar(bool is_overlay_scrollbar) {
58    is_overlay_scrollbar_ = is_overlay_scrollbar;
59  }
60  bool is_overlay_scrollbar() const { return is_overlay_scrollbar_; }
61
62  void SetCurrentPos(float current_pos);
63  void SetMaximum(int maximum);
64
65  gfx::Rect ComputeThumbQuadRect() const;
66
67 protected:
68  PaintedScrollbarLayerImpl(LayerTreeImpl* tree_impl,
69                            int id,
70                            ScrollbarOrientation orientation);
71
72 private:
73  virtual const char* LayerTypeAsString() const OVERRIDE;
74
75  gfx::Rect ScrollbarLayerRectToContentRect(gfx::RectF layer_rect) const;
76
77  UIResourceId track_ui_resource_id_;
78  UIResourceId thumb_ui_resource_id_;
79
80  float current_pos_;
81  int maximum_;
82  int thumb_thickness_;
83  int thumb_length_;
84  int track_start_;
85  int track_length_;
86  ScrollbarOrientation orientation_;
87
88  // Difference between the clip layer's height and the visible viewport
89  // height (which may differ in the presence of top-controls hiding).
90  float vertical_adjust_;
91
92  float visible_to_total_length_ratio_;
93
94  int scroll_layer_id_;
95
96  bool is_overlay_scrollbar_;
97
98  DISALLOW_COPY_AND_ASSIGN(PaintedScrollbarLayerImpl);
99};
100
101}  // namespace cc
102#endif  // CC_LAYERS_PAINTED_SCROLLBAR_LAYER_IMPL_H_
103