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1 // Copyright (c) 2012 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 #include "ash/wm/common/background_animator.h" | |
6 | |
7 namespace ash { | |
8 namespace { | |
9 | |
10 // Duration of the background animation. | |
11 const int kBackgroundDurationMS = 1000; | |
12 } | |
13 | |
14 BackgroundAnimator::BackgroundAnimator(BackgroundAnimatorDelegate* delegate, | |
15 int min_alpha, | |
16 int max_alpha) | |
17 : delegate_(delegate), | |
18 min_alpha_(min_alpha), | |
19 max_alpha_(max_alpha), | |
20 animation_(this), | |
21 paints_background_(false), | |
22 alpha_(min_alpha) { | |
23 animation_.SetSlideDuration(kBackgroundDurationMS); | |
24 } | |
25 | |
26 BackgroundAnimator::~BackgroundAnimator() {} | |
27 | |
28 void BackgroundAnimator::SetDuration(int time_in_ms) { | |
29 animation_.SetSlideDuration(time_in_ms); | |
30 } | |
31 | |
32 void BackgroundAnimator::SetPaintsBackground( | |
33 bool value, | |
34 BackgroundAnimatorChangeType type) { | |
35 if (paints_background_ == value) | |
36 return; | |
37 paints_background_ = value; | |
38 if (type == BACKGROUND_CHANGE_IMMEDIATE && !animation_.is_animating()) { | |
39 animation_.Reset(value ? 1.0f : 0.0f); | |
40 AnimationProgressed(&animation_); | |
41 return; | |
42 } | |
43 if (paints_background_) | |
44 animation_.Show(); | |
45 else | |
46 animation_.Hide(); | |
47 } | |
48 | |
49 void BackgroundAnimator::AnimationProgressed(const gfx::Animation* animation) { | |
50 int alpha = animation->CurrentValueBetween(min_alpha_, max_alpha_); | |
51 if (alpha_ == alpha) | |
52 return; | |
53 alpha_ = alpha; | |
54 delegate_->UpdateBackground(alpha_); | |
55 } | |
56 | |
57 } // namespace ash | |
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