- add sources.
[platform/framework/web/crosswalk.git] / src / ui / gfx / animation / multi_animation.cc
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 #include "ui/gfx/animation/multi_animation.h"
6
7 #include "base/logging.h"
8 #include "ui/gfx/animation/animation_delegate.h"
9
10 namespace gfx {
11
12 // Default interval, in ms.
13 static const int kDefaultTimerInterval = 20;
14
15 static int TotalTime(const MultiAnimation::Parts& parts) {
16   int time_ms = 0;
17   for (size_t i = 0; i < parts.size(); ++i) {
18     DCHECK(parts[i].end_time_ms - parts[i].start_time_ms >= parts[i].time_ms);
19     time_ms += parts[i].time_ms;
20   }
21   return time_ms;
22 }
23
24 MultiAnimation::MultiAnimation(const Parts& parts,
25                                base::TimeDelta timer_interval)
26     : Animation(timer_interval),
27       parts_(parts),
28       cycle_time_ms_(TotalTime(parts)),
29       current_value_(0),
30       current_part_index_(0),
31       continuous_(true) {
32   DCHECK(!parts_.empty());
33 }
34
35 MultiAnimation::~MultiAnimation() {}
36
37 // static.
38 base::TimeDelta MultiAnimation::GetDefaultTimerInterval() {
39   return base::TimeDelta::FromMilliseconds(kDefaultTimerInterval);
40 }
41
42 double MultiAnimation::GetCurrentValue() const {
43   return current_value_;
44 }
45
46 void MultiAnimation::Step(base::TimeTicks time_now) {
47   double last_value = current_value_;
48   size_t last_index = current_part_index_;
49
50   int delta = static_cast<int>((time_now - start_time()).InMilliseconds());
51   if (delta >= cycle_time_ms_ && !continuous_) {
52     current_part_index_ = parts_.size() - 1;
53     current_value_ = Tween::CalculateValue(parts_[current_part_index_].type, 1);
54     Stop();
55     return;
56   }
57   delta %= cycle_time_ms_;
58   const Part& part = GetPart(&delta, &current_part_index_);
59   double percent = static_cast<double>(delta + part.start_time_ms) /
60         static_cast<double>(part.end_time_ms);
61   DCHECK(percent <= 1);
62   current_value_ = Tween::CalculateValue(part.type, percent);
63
64   if ((current_value_ != last_value || current_part_index_ != last_index) &&
65       delegate()) {
66     delegate()->AnimationProgressed(this);
67   }
68 }
69
70 void MultiAnimation::SetStartTime(base::TimeTicks start_time) {
71   Animation::SetStartTime(start_time);
72   current_value_ = 0;
73   current_part_index_ = 0;
74 }
75
76 const MultiAnimation::Part& MultiAnimation::GetPart(int* time_ms,
77                                                     size_t* part_index) {
78   DCHECK(*time_ms < cycle_time_ms_);
79
80   for (size_t i = 0; i < parts_.size(); ++i) {
81     if (*time_ms < parts_[i].time_ms) {
82       *part_index = i;
83       return parts_[i];
84     }
85
86     *time_ms -= parts_[i].time_ms;
87   }
88   NOTREACHED();
89   *time_ms = 0;
90   *part_index = 0;
91   return parts_[0];
92 }
93
94 }  // namespace gfx