1// Copyright 2014 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/compositor/layer_animator_collection.h"
6
7#include <set>
8
9#include "base/time/time.h"
10#include "ui/compositor/compositor.h"
11#include "ui/compositor/layer_animator.h"
12#include "ui/gfx/frame_time.h"
13
14namespace ui {
15
16LayerAnimatorCollection::LayerAnimatorCollection(Compositor* compositor)
17    : compositor_(compositor), last_tick_time_(gfx::FrameTime::Now()) {
18}
19
20LayerAnimatorCollection::~LayerAnimatorCollection() {
21  if (compositor_ && compositor_->HasAnimationObserver(this))
22    compositor_->RemoveAnimationObserver(this);
23}
24
25void LayerAnimatorCollection::StartAnimator(
26    scoped_refptr<LayerAnimator> animator) {
27  DCHECK_EQ(0U, animators_.count(animator));
28  if (!animators_.size())
29    last_tick_time_ = gfx::FrameTime::Now();
30  animators_.insert(animator);
31  if (animators_.size() == 1U && compositor_)
32    compositor_->AddAnimationObserver(this);
33}
34
35void LayerAnimatorCollection::StopAnimator(
36    scoped_refptr<LayerAnimator> animator) {
37  DCHECK_GT(animators_.count(animator), 0U);
38  animators_.erase(animator);
39  if (animators_.empty() && compositor_)
40    compositor_->RemoveAnimationObserver(this);
41}
42
43bool LayerAnimatorCollection::HasActiveAnimators() const {
44  return !animators_.empty();
45}
46
47void LayerAnimatorCollection::OnAnimationStep(base::TimeTicks now) {
48  last_tick_time_ = now;
49  std::set<scoped_refptr<LayerAnimator> > list = animators_;
50  for (std::set<scoped_refptr<LayerAnimator> >::iterator iter = list.begin();
51       iter != list.end();
52       ++iter) {
53    // Make sure the animator is still valid.
54    if (animators_.count(*iter) > 0)
55      (*iter)->Step(now);
56  }
57  if (!HasActiveAnimators() && compositor_)
58    compositor_->RemoveAnimationObserver(this);
59}
60
61}  // namespace ui
62