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1 // Copyright 2011 The Chromium Authors. All rights reserved. | 1 // Copyright 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef CC_INPUT_PAGE_SCALE_ANIMATION_H_ | 5 #ifndef CC_INPUT_PAGE_SCALE_ANIMATION_H_ |
6 #define CC_INPUT_PAGE_SCALE_ANIMATION_H_ | 6 #define CC_INPUT_PAGE_SCALE_ANIMATION_H_ |
7 | 7 |
8 #include "base/basictypes.h" | 8 #include "base/basictypes.h" |
9 #include "base/memory/scoped_ptr.h" | 9 #include "base/memory/scoped_ptr.h" |
10 #include "ui/gfx/size.h" | 10 #include "ui/gfx/size.h" |
11 #include "ui/gfx/vector2d_f.h" | 11 #include "ui/gfx/vector2d_f.h" |
12 | 12 |
13 namespace cc { | 13 namespace cc { |
14 class TimingFunction; | 14 class TimingFunction; |
15 | 15 |
16 // A small helper class that does the math for zoom animations, primarily for | 16 // A small helper class that does the math for zoom animations, primarily for |
17 // double-tap zoom. Initialize it with starting and ending scroll/page scale | 17 // double-tap zoom. Initialize it with starting and ending scroll/page scale |
18 // positions and an animation length time, then call ...AtTime() at every frame | 18 // positions and an animation length time, then call ...AtTime() at every frame |
19 // to obtain the current interpolated position. The supplied timing function | 19 // to obtain the current interpolated position. The supplied timing function |
20 // is used to ease the animation. | 20 // is used to ease the animation. |
21 // | 21 // |
22 // All sizes and vectors in this class's public methods are in the root scroll | 22 // All sizes and vectors in this class's public methods are in the root scroll |
23 // layer's coordinate space. | 23 // layer's coordinate space. |
24 class PageScaleAnimation { | 24 class PageScaleAnimation { |
25 public: | 25 public: |
26 // Construct with the state at the beginning of the animation. | 26 // Construct with the state at the beginning of the animation. |
27 static scoped_ptr<PageScaleAnimation> Create( | 27 static scoped_ptr<PageScaleAnimation> Create( |
28 gfx::Vector2dF start_scroll_offset, | 28 const gfx::Vector2dF& start_scroll_offset, |
29 float start_page_scale_factor, | 29 float start_page_scale_factor, |
30 const gfx::SizeF& viewport_size, | 30 const gfx::SizeF& viewport_size, |
31 const gfx::SizeF& root_layer_size, | 31 const gfx::SizeF& root_layer_size, |
32 scoped_ptr<TimingFunction> timing_function); | 32 scoped_ptr<TimingFunction> timing_function); |
33 | 33 |
34 ~PageScaleAnimation(); | 34 ~PageScaleAnimation(); |
35 | 35 |
36 // The following methods initialize the animation. Call one of them | 36 // The following methods initialize the animation. Call one of them |
37 // immediately after construction to set the final scroll and page scale. | 37 // immediately after construction to set the final scroll and page scale. |
38 | 38 |
39 // Zoom while explicitly specifying the top-left scroll position. | 39 // Zoom while explicitly specifying the top-left scroll position. |
40 void ZoomTo(gfx::Vector2dF target_scroll_offset, | 40 void ZoomTo(const gfx::Vector2dF& target_scroll_offset, |
41 float target_page_scale_factor, | 41 float target_page_scale_factor, |
42 double duration); | 42 double duration); |
43 | 43 |
44 // Zoom based on a specified anchor. The animator will attempt to keep it | 44 // Zoom based on a specified anchor. The animator will attempt to keep it |
45 // at the same position on the physical display throughout the animation, | 45 // at the same position on the physical display throughout the animation, |
46 // unless the edges of the root layer are hit. The anchor is specified | 46 // unless the edges of the root layer are hit. The anchor is specified |
47 // as an offset from the content layer. | 47 // as an offset from the content layer. |
48 void ZoomWithAnchor(gfx::Vector2dF anchor, | 48 void ZoomWithAnchor(const gfx::Vector2dF& anchor, |
49 float target_page_scale_factor, | 49 float target_page_scale_factor, |
50 double duration); | 50 double duration); |
51 | 51 |
52 // These should be called before the first frame of animation to initialize | 52 // These should be called before the first frame of animation to initialize |
53 // the start time. StartAnimation should only be called once after creation. | 53 // the start time. StartAnimation should only be called once after creation. |
54 bool IsAnimationStarted() const; | 54 bool IsAnimationStarted() const; |
55 void StartAnimation(double time); | 55 void StartAnimation(double time); |
56 | 56 |
57 // Call these functions while the animation is in progress to output the | 57 // Call these functions while the animation is in progress to output the |
58 // current state. | 58 // current state. |
59 gfx::Vector2dF ScrollOffsetAtTime(double time) const; | 59 gfx::Vector2dF ScrollOffsetAtTime(double time) const; |
60 float PageScaleFactorAtTime(double time) const; | 60 float PageScaleFactorAtTime(double time) const; |
61 bool IsAnimationCompleteAtTime(double time) const; | 61 bool IsAnimationCompleteAtTime(double time) const; |
62 | 62 |
63 // The following methods return state which is invariant throughout the | 63 // The following methods return state which is invariant throughout the |
64 // course of the animation. | 64 // course of the animation. |
65 double start_time() const { return start_time_; } | 65 double start_time() const { return start_time_; } |
66 double duration() const { return duration_; } | 66 double duration() const { return duration_; } |
67 double end_time() const { return start_time_ + duration_; } | 67 double end_time() const { return start_time_ + duration_; } |
68 gfx::Vector2dF target_scroll_offset() const { return target_scroll_offset_; } | 68 gfx::Vector2dF target_scroll_offset() const { return target_scroll_offset_; } |
69 float target_page_scale_factor() const { return target_page_scale_factor_; } | 69 float target_page_scale_factor() const { return target_page_scale_factor_; } |
70 | 70 |
71 protected: | 71 protected: |
72 PageScaleAnimation(gfx::Vector2dF start_scroll_offset, | 72 PageScaleAnimation(const gfx::Vector2dF& start_scroll_offset, |
73 float start_page_scale_factor, | 73 float start_page_scale_factor, |
74 const gfx::SizeF& viewport_size, | 74 const gfx::SizeF& viewport_size, |
75 const gfx::SizeF& root_layer_size, | 75 const gfx::SizeF& root_layer_size, |
76 scoped_ptr<TimingFunction> timing_function); | 76 scoped_ptr<TimingFunction> timing_function); |
77 | 77 |
78 private: | 78 private: |
79 void ClampTargetScrollOffset(); | 79 void ClampTargetScrollOffset(); |
80 void InferTargetScrollOffsetFromStartAnchor(); | 80 void InferTargetScrollOffsetFromStartAnchor(); |
81 void InferTargetAnchorFromScrollOffsets(); | 81 void InferTargetAnchorFromScrollOffsets(); |
82 | 82 |
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104 double duration_; | 104 double duration_; |
105 | 105 |
106 scoped_ptr<TimingFunction> timing_function_; | 106 scoped_ptr<TimingFunction> timing_function_; |
107 | 107 |
108 DISALLOW_COPY_AND_ASSIGN(PageScaleAnimation); | 108 DISALLOW_COPY_AND_ASSIGN(PageScaleAnimation); |
109 }; | 109 }; |
110 | 110 |
111 } // namespace cc | 111 } // namespace cc |
112 | 112 |
113 #endif // CC_INPUT_PAGE_SCALE_ANIMATION_H_ | 113 #endif // CC_INPUT_PAGE_SCALE_ANIMATION_H_ |
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