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1 // Copyright (c) 2011 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 UI_BASE_ANIMATION_ANIMATION_CONTAINER_H_ | |
6 #define UI_BASE_ANIMATION_ANIMATION_CONTAINER_H_ | |
7 | |
8 #include <set> | |
9 | |
10 #include "base/memory/ref_counted.h" | |
11 #include "base/time/time.h" | |
12 #include "base/timer/timer.h" | |
13 #include "ui/base/ui_export.h" | |
14 | |
15 namespace ui { | |
16 | |
17 class AnimationContainerElement; | |
18 class AnimationContainerObserver; | |
19 | |
20 // AnimationContainer is used by Animation to manage the underlying timer. | |
21 // Internally each Animation creates a single AnimationContainer. You can | |
22 // group a set of Animations into the same AnimationContainer by way of | |
23 // Animation::SetContainer. Grouping a set of Animations into the same | |
24 // AnimationContainer ensures they all update and start at the same time. | |
25 // | |
26 // AnimationContainer is ref counted. Each Animation contained within the | |
27 // AnimationContainer own it. | |
28 class UI_EXPORT AnimationContainer | |
29 : public base::RefCounted<AnimationContainer> { | |
30 public: | |
31 AnimationContainer(); | |
32 | |
33 // Invoked by Animation when it needs to start. Starts the timer if necessary. | |
34 // NOTE: This is invoked by Animation for you, you shouldn't invoke this | |
35 // directly. | |
36 void Start(AnimationContainerElement* animation); | |
37 | |
38 // Invoked by Animation when it needs to stop. If there are no more animations | |
39 // running the timer stops. | |
40 // NOTE: This is invoked by Animation for you, you shouldn't invoke this | |
41 // directly. | |
42 void Stop(AnimationContainerElement* animation); | |
43 | |
44 void set_observer(AnimationContainerObserver* observer) { | |
45 observer_ = observer; | |
46 } | |
47 | |
48 // The time the last animation ran at. | |
49 base::TimeTicks last_tick_time() const { return last_tick_time_; } | |
50 | |
51 // Are there any timers running? | |
52 bool is_running() const { return !elements_.empty(); } | |
53 | |
54 private: | |
55 friend class base::RefCounted<AnimationContainer>; | |
56 | |
57 typedef std::set<AnimationContainerElement*> Elements; | |
58 | |
59 ~AnimationContainer(); | |
60 | |
61 // Timer callback method. | |
62 void Run(); | |
63 | |
64 // Sets min_timer_interval_ and restarts the timer. | |
65 void SetMinTimerInterval(base::TimeDelta delta); | |
66 | |
67 // Returns the min timer interval of all the timers. | |
68 base::TimeDelta GetMinInterval(); | |
69 | |
70 // Represents one of two possible values: | |
71 // . If only a single animation has been started and the timer hasn't yet | |
72 // fired this is the time the animation was added. | |
73 // . The time the last animation ran at (::Run was invoked). | |
74 base::TimeTicks last_tick_time_; | |
75 | |
76 // Set of elements (animations) being managed. | |
77 Elements elements_; | |
78 | |
79 // Minimum interval the timers run at. | |
80 base::TimeDelta min_timer_interval_; | |
81 | |
82 base::RepeatingTimer<AnimationContainer> timer_; | |
83 | |
84 AnimationContainerObserver* observer_; | |
85 | |
86 DISALLOW_COPY_AND_ASSIGN(AnimationContainer); | |
87 }; | |
88 | |
89 } // namespace ui | |
90 | |
91 #endif // UI_BASE_ANIMATION_ANIMATION_CONTAINER_H_ | |
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