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// Copyright 2014 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/compositor/layer_animator_collection.h"
#include <set>
#include "base/time/time.h"
#include "ui/compositor/compositor.h"
#include "ui/compositor/layer_animator.h"
#include "ui/gfx/frame_time.h"
namespace ui {
LayerAnimatorCollection::LayerAnimatorCollection(Compositor* compositor)
: compositor_(compositor), last_tick_time_(gfx::FrameTime::Now()) {
}
LayerAnimatorCollection::~LayerAnimatorCollection() {
if (compositor_ && compositor_->HasAnimationObserver(this))
compositor_->RemoveAnimationObserver(this);
}
void LayerAnimatorCollection::StartAnimator(
scoped_refptr<LayerAnimator> animator) {
DCHECK_EQ(0U, animators_.count(animator));
if (!animators_.size())
last_tick_time_ = gfx::FrameTime::Now();
animators_.insert(animator);
if (animators_.size() == 1U && compositor_)
compositor_->AddAnimationObserver(this);
}
void LayerAnimatorCollection::StopAnimator(
scoped_refptr<LayerAnimator> animator) {
DCHECK_GT(animators_.count(animator), 0U);
animators_.erase(animator);
if (animators_.empty() && compositor_)
compositor_->RemoveAnimationObserver(this);
}
bool LayerAnimatorCollection::HasActiveAnimators() const {
return !animators_.empty();
}
void LayerAnimatorCollection::OnAnimationStep(base::TimeTicks now) {
last_tick_time_ = now;
std::set<scoped_refptr<LayerAnimator> > list = animators_;
for (std::set<scoped_refptr<LayerAnimator> >::iterator iter = list.begin();
iter != list.end();
++iter) {
// Make sure the animator is still valid.
if (animators_.count(*iter) > 0)
(*iter)->Step(now);
}
if (!HasActiveAnimators() && compositor_)
compositor_->RemoveAnimationObserver(this);
}
} // namespace ui
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