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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/animation_container.h"
#include "ui/gfx/animation/animation_container_element.h"
#include "ui/gfx/animation/animation_container_observer.h"
using base::TimeDelta;
using base::TimeTicks;
namespace gfx {
AnimationContainer::AnimationContainer()
: last_tick_time_(TimeTicks::Now()),
observer_(NULL) {
}
AnimationContainer::~AnimationContainer() {
// The animations own us and stop themselves before being deleted. If
// elements_ is not empty, something is wrong.
DCHECK(elements_.empty());
}
void AnimationContainer::Start(AnimationContainerElement* element) {
DCHECK(elements_.count(element) == 0); // Start should only be invoked if the
// element isn't running.
if (elements_.empty()) {
last_tick_time_ = TimeTicks::Now();
SetMinTimerInterval(element->GetTimerInterval());
} else if (element->GetTimerInterval() < min_timer_interval_) {
SetMinTimerInterval(element->GetTimerInterval());
}
element->SetStartTime(last_tick_time_);
elements_.insert(element);
}
void AnimationContainer::Stop(AnimationContainerElement* element) {
DCHECK(elements_.count(element) > 0); // The element must be running.
elements_.erase(element);
if (elements_.empty()) {
timer_.Stop();
if (observer_)
observer_->AnimationContainerEmpty(this);
} else {
TimeDelta min_timer_interval = GetMinInterval();
if (min_timer_interval > min_timer_interval_)
SetMinTimerInterval(min_timer_interval);
}
}
void AnimationContainer::Run() {
// We notify the observer after updating all the elements. If all the elements
// are deleted as a result of updating then our ref count would go to zero and
// we would be deleted before we notify our observer. We add a reference to
// ourself here to make sure we're still valid after running all the elements.
scoped_refptr<AnimationContainer> this_ref(this);
TimeTicks current_time = TimeTicks::Now();
last_tick_time_ = current_time;
// Make a copy of the elements to iterate over so that if any elements are
// removed as part of invoking Step there aren't any problems.
Elements elements = elements_;
for (Elements::const_iterator i = elements.begin();
i != elements.end(); ++i) {
// Make sure the element is still valid.
if (elements_.find(*i) != elements_.end())
(*i)->Step(current_time);
}
if (observer_)
observer_->AnimationContainerProgressed(this);
}
void AnimationContainer::SetMinTimerInterval(base::TimeDelta delta) {
// This doesn't take into account how far along the current element is, but
// that shouldn't be a problem for uses of Animation/AnimationContainer.
timer_.Stop();
min_timer_interval_ = delta;
timer_.Start(FROM_HERE, min_timer_interval_, this, &AnimationContainer::Run);
}
TimeDelta AnimationContainer::GetMinInterval() {
DCHECK(!elements_.empty());
TimeDelta min;
Elements::const_iterator i = elements_.begin();
min = (*i)->GetTimerInterval();
for (++i; i != elements_.end(); ++i) {
if ((*i)->GetTimerInterval() < min)
min = (*i)->GetTimerInterval();
}
return min;
}
} // namespace gfx
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