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/shelf/background_animator.h"
6
7
8 namespace ash {
9 namespace internal {
10
11 namespace {
12
13 // Duration of the background animation.
14 const int kBackgroundDurationMS = 1000;
15
16 }
17
BackgroundAnimator(BackgroundAnimatorDelegate * delegate,int min_alpha,int max_alpha)18 BackgroundAnimator::BackgroundAnimator(BackgroundAnimatorDelegate* delegate,
19 int min_alpha,
20 int max_alpha)
21 : delegate_(delegate),
22 min_alpha_(min_alpha),
23 max_alpha_(max_alpha),
24 animation_(this),
25 paints_background_(false),
26 alpha_(min_alpha) {
27 animation_.SetSlideDuration(kBackgroundDurationMS);
28 }
29
~BackgroundAnimator()30 BackgroundAnimator::~BackgroundAnimator() {
31 }
32
SetDuration(int time_in_ms)33 void BackgroundAnimator::SetDuration(int time_in_ms) {
34 animation_.SetSlideDuration(time_in_ms);
35 }
36
SetPaintsBackground(bool value,BackgroundAnimatorChangeType type)37 void BackgroundAnimator::SetPaintsBackground(
38 bool value, BackgroundAnimatorChangeType type) {
39 if (paints_background_ == value)
40 return;
41 paints_background_ = value;
42 if (type == BACKGROUND_CHANGE_IMMEDIATE && !animation_.is_animating()) {
43 animation_.Reset(value ? 1.0f : 0.0f);
44 AnimationProgressed(&animation_);
45 return;
46 }
47 if (paints_background_)
48 animation_.Show();
49 else
50 animation_.Hide();
51 }
52
AnimationProgressed(const gfx::Animation * animation)53 void BackgroundAnimator::AnimationProgressed(const gfx::Animation* animation) {
54 int alpha = animation->CurrentValueBetween(min_alpha_, max_alpha_);
55 if (alpha_ == alpha)
56 return;
57 alpha_ = alpha;
58 delegate_->UpdateBackground(alpha_);
59 }
60
61 } // namespace internal
62 } // namespace ash
63