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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 #include "ui/base/animation/multi_animation.h"
      6 
      7 #include "base/logging.h"
      8 #include "ui/base/animation/animation_delegate.h"
      9 
     10 namespace ui {
     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 ui
     95