1 files changed, 104 insertions, 0 deletions
diff --git a/ui/base/animation/animation_container.cc b/ui/base/animation/animation_container.cc
new file mode 100644
index 0000000..1e316cd
--- /dev/null
+++ b/ui/base/animation/animation_container.cc
@@ -0,0 +1,104 @@
+// 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/base/animation/animation_container.h"
+
+#include "ui/base/animation/animation_container_element.h"
+#include "ui/base/animation/animation_container_observer.h"
+
+using base::TimeDelta;
+using base::TimeTicks;
+
+namespace ui {
+
+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(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 ui