ui/compositor/layer_animator_collection.cc

   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/layer_animator.h"
  11 #include "ui/gfx/frame_time.h"
  12
  13 namespace ui {
  14
  15 LayerAnimatorCollection::LayerAnimatorCollection(
  16     LayerAnimatorCollectionDelegate* delegate)
  17     : delegate_(delegate),
  18       last_tick_time_(gfx::FrameTime::Now()) {
  19 }
  20
  21 LayerAnimatorCollection::~LayerAnimatorCollection() {
  22 }
  23
  24 void LayerAnimatorCollection::StartAnimator(
  25     scoped_refptr<LayerAnimator> animator) {
  26   DCHECK_EQ(0U, animators_.count(animator));
  27   if (!animators_.size())
  28     last_tick_time_ = gfx::FrameTime::Now();
  29   animators_.insert(animator);
  30   if (delegate_)
  31     delegate_->ScheduleAnimationForLayerCollection();
  32 }
  33
  34 void LayerAnimatorCollection::StopAnimator(
  35     scoped_refptr<LayerAnimator> animator) {
  36   DCHECK_GT(animators_.count(animator), 0U);
  37   animators_.erase(animator);
  38 }
  39
  40 bool LayerAnimatorCollection::HasActiveAnimators() const {
  41   return !animators_.empty();
  42 }
  43
  44 void LayerAnimatorCollection::Progress(base::TimeTicks now) {
  45   last_tick_time_ = now;
  46   std::set<scoped_refptr<LayerAnimator> > list = animators_;
  47   for (std::set<scoped_refptr<LayerAnimator> >::iterator iter = list.begin();
  48        iter != list.end();
  49        ++iter) {
  50     // Make sure the animator is still valid.
  51     if (animators_.count(*iter) > 0)
  52       (*iter)->Step(now);
  53   }
  54 }
  55
  56 }  // namespace ui