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 14 namespace ui { 15 16 LayerAnimatorCollection::LayerAnimatorCollection(Compositor* compositor) 17 : compositor_(compositor), last_tick_time_(gfx::FrameTime::Now()) { 18 } 19 20 LayerAnimatorCollection::~LayerAnimatorCollection() { 21 if (compositor_ && compositor_->HasAnimationObserver(this)) 22 compositor_->RemoveAnimationObserver(this); 23 } 24 25 void 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 35 void 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 43 bool LayerAnimatorCollection::HasActiveAnimators() const { 44 return !animators_.empty(); 45 } 46 47 void 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
