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 "ui/gfx/animation/throb_animation.h"
6
7#include <limits>
8
9namespace gfx {
10
11static const int kDefaultThrobDurationMS = 400;
12
13ThrobAnimation::ThrobAnimation(AnimationDelegate* target)
14    : SlideAnimation(target),
15      slide_duration_(GetSlideDuration()),
16      throb_duration_(kDefaultThrobDurationMS),
17      cycles_remaining_(0),
18      throbbing_(false) {
19}
20
21void ThrobAnimation::StartThrobbing(int cycles_til_stop) {
22  cycles_til_stop = cycles_til_stop >= 0 ? cycles_til_stop :
23                                           std::numeric_limits<int>::max();
24  cycles_remaining_ = cycles_til_stop;
25  throbbing_ = true;
26  SlideAnimation::SetSlideDuration(throb_duration_);
27  if (is_animating())
28    return;  // We're already running, we'll cycle when current loop finishes.
29
30  if (IsShowing())
31    SlideAnimation::Hide();
32  else
33    SlideAnimation::Show();
34  cycles_remaining_ = cycles_til_stop;
35}
36
37void ThrobAnimation::Reset() {
38  Reset(0);
39}
40
41void ThrobAnimation::Reset(double value) {
42  ResetForSlide();
43  SlideAnimation::Reset(value);
44}
45
46void ThrobAnimation::Show() {
47  ResetForSlide();
48  SlideAnimation::Show();
49}
50
51void ThrobAnimation::Hide() {
52  ResetForSlide();
53  SlideAnimation::Hide();
54}
55
56void ThrobAnimation::SetSlideDuration(int duration) {
57  slide_duration_ = duration;
58}
59
60void ThrobAnimation::Step(base::TimeTicks time_now) {
61  LinearAnimation::Step(time_now);
62
63  if (!is_animating() && throbbing_) {
64    // Were throbbing a finished a cycle. Start the next cycle unless we're at
65    // the end of the cycles, in which case we stop.
66    cycles_remaining_--;
67    if (IsShowing()) {
68      // We want to stop hidden, hence this doesn't check cycles_remaining_.
69      SlideAnimation::Hide();
70    } else if (cycles_remaining_ > 0) {
71      SlideAnimation::Show();
72    } else {
73      // We're done throbbing.
74      throbbing_ = false;
75    }
76  }
77}
78
79void ThrobAnimation::ResetForSlide() {
80  SlideAnimation::SetSlideDuration(slide_duration_);
81  cycles_remaining_ = 0;
82  throbbing_ = false;
83}
84
85}  // namespace gfx
86