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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/gfx/animation/multi_animation.h"
#include <numeric>
#include "base/check_op.h"
#include "base/notreached.h"
#include "ui/gfx/animation/animation_delegate.h"
namespace gfx {
static base::TimeDelta TotalTime(const MultiAnimation::Parts& parts) {
return std::accumulate(parts.cbegin(), parts.cend(), base::TimeDelta(),
[](base::TimeDelta total, const auto& part) {
return total + part.part_length;
});
}
// static
constexpr base::TimeDelta MultiAnimation::kDefaultTimerInterval;
MultiAnimation::MultiAnimation(const Parts& parts,
base::TimeDelta timer_interval)
: Animation(timer_interval),
parts_(parts),
cycle_time_(TotalTime(parts)),
current_value_(0),
current_part_index_(0),
continuous_(true) {
DCHECK(!parts_.empty());
for (const auto& part : parts)
DCHECK_GE(part.total_length - part.part_start, part.part_length);
}
MultiAnimation::~MultiAnimation() = default;
double MultiAnimation::GetCurrentValue() const {
return current_value_;
}
void MultiAnimation::Step(base::TimeTicks time_now) {
double last_value = current_value_;
size_t last_index = current_part_index_;
base::TimeDelta delta = time_now - start_time();
bool should_stop = delta >= cycle_time_ && !continuous_;
if (should_stop) {
current_part_index_ = parts_.size() - 1;
current_value_ = Tween::CalculateValue(parts_[current_part_index_].type, 1);
} else {
delta %= cycle_time_;
const Part& part = GetPart(&delta, ¤t_part_index_);
const double percent = (delta + part.part_start) / part.total_length;
DCHECK_LE(percent, 1);
current_value_ = Tween::CalculateValue(part.type, percent);
}
if ((current_value_ != last_value || current_part_index_ != last_index) &&
delegate()) {
// Run AnimationProgressed() even if the animation will be stopped, so that
// the animation runs its final frame.
delegate()->AnimationProgressed(this);
}
if (should_stop)
Stop();
}
void MultiAnimation::SetStartTime(base::TimeTicks start_time) {
Animation::SetStartTime(start_time);
current_value_ = 0;
current_part_index_ = 0;
}
const MultiAnimation::Part& MultiAnimation::GetPart(base::TimeDelta* time,
size_t* part_index) {
DCHECK_LT(*time, cycle_time_);
for (size_t i = 0; i < parts_.size(); ++i) {
if (*time < parts_[i].part_length) {
*part_index = i;
return parts_[i];
}
*time -= parts_[i].part_length;
}
NOTREACHED();
return parts_[0];
}
} // namespace gfx
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