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_SCROLLBAR_LAYER_IMPL_BASE_H_
6#define CC_LAYERS_SCROLLBAR_LAYER_IMPL_BASE_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/layer_impl.h"
12
13namespace cc {
14
15class LayerTreeImpl;
16
17class CC_EXPORT ScrollbarLayerImplBase : public LayerImpl {
18 public:
19  int ScrollLayerId() const {
20    return scroll_layer_ ? scroll_layer_->id() : Layer::INVALID_ID;
21  }
22  int ClipLayerId() const {
23    return clip_layer_ ? clip_layer_->id() : Layer::INVALID_ID;
24  }
25
26  void SetScrollLayerAndClipLayerByIds(int scroll_layer_id, int clip_layer_id);
27  void ClearScrollLayer() { scroll_layer_ = NULL; }
28  void ClearClipLayer() { clip_layer_ = NULL; }
29
30  float current_pos() const { return current_pos_; }
31  bool SetCurrentPos(float current_pos);
32  int maximum() const { return maximum_; }
33  bool SetMaximum(int maximum);
34
35  bool SetVerticalAdjust(float vertical_adjust);
36
37  bool is_overlay_scrollbar() const { return is_overlay_scrollbar_; }
38  void set_is_overlay_scrollbar(bool is_overlay) {
39    is_overlay_scrollbar_ = is_overlay;
40  }
41
42  ScrollbarOrientation orientation() const { return orientation_; }
43  bool is_left_side_vertical_scrollbar() {
44    return is_left_side_vertical_scrollbar_;
45  }
46
47  virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
48  virtual ScrollbarLayerImplBase* ToScrollbarLayer() OVERRIDE;
49  void PushScrollClipPropertiesTo(LayerImpl* layer);
50
51  bool SetVisibleToTotalLengthRatio(float ratio);
52  virtual gfx::Rect ComputeThumbQuadRect() const;
53
54  float thumb_thickness_scale_factor() {
55    return thumb_thickness_scale_factor_;
56  }
57  bool SetThumbThicknessScaleFactor(float thumb_thickness_scale_factor);
58
59  void ScrollbarParametersDidChange();
60
61 protected:
62  ScrollbarLayerImplBase(LayerTreeImpl* tree_impl,
63                         int id,
64                         ScrollbarOrientation orientation,
65                         bool is_left_side_vertical_scrollbar,
66                         bool is_overlay);
67  virtual ~ScrollbarLayerImplBase();
68
69  gfx::Rect ScrollbarLayerRectToContentRect(const gfx::RectF& layer_rect) const;
70
71  float visible_to_total_length_ratio() const {
72    return visible_to_total_length_ratio_;
73  }
74  float vertical_adjust() const { return vertical_adjust_; }
75
76  virtual int ThumbThickness() const = 0;
77  virtual int ThumbLength() const = 0;
78  virtual float TrackLength() const = 0;
79  virtual int TrackStart() const = 0;
80  // Indicates whether the thumb length can be changed without going back to the
81  // main thread.
82  virtual bool IsThumbResizable() const = 0;
83
84 private:
85  LayerImpl* scroll_layer_;
86  LayerImpl* clip_layer_;
87  bool is_overlay_scrollbar_;
88
89  float thumb_thickness_scale_factor_;
90  float current_pos_;
91  int maximum_;
92  ScrollbarOrientation orientation_;
93  bool is_left_side_vertical_scrollbar_;
94
95  // Difference between the clip layer's height and the visible viewport
96  // height (which may differ in the presence of top-controls hiding).
97  float vertical_adjust_;
98
99  float visible_to_total_length_ratio_;
100
101  DISALLOW_COPY_AND_ASSIGN(ScrollbarLayerImplBase);
102};
103
104}  // namespace cc
105
106#endif  // CC_LAYERS_SCROLLBAR_LAYER_IMPL_BASE_H_
107