Adds AnimationContainer, which can be used to group a set of

animations to have the same timer. By default each animation has one
animationcontainer, but I'm going to change the tab renderer to share
the animationcontainer so that the pulse effects happen in unison.

Also updated the BoundsAnimator so that I can use it by the TabStrip.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/1575011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@43407 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 93 insertions, 0 deletions

diff --git a/app/animation_container.cc b/app/animation_container.cc
new file mode 100644
index 0000000..b0cc86a
--- /dev/null
+++ b/app/animation_container.cc
@@ -0,0 +1,93 @@
+// Copyright (c) 2010 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 "app/animation_container.h"
+
+#include "app/animation.h"
+
+using base::TimeDelta;
+using base::TimeTicks;
+
+AnimationContainer::AnimationContainer()
+    : last_tick_time_(TimeTicks::Now()),
+      observer_(NULL) {
+}
+
+AnimationContainer::~AnimationContainer() {
+  // The animations own us and stop themselves before being deleted. If
+  // animations_ is not empty, something is wrong.
+  DCHECK(animations_.empty());
+}
+
+void AnimationContainer::Start(Animation* animation) {
+  DCHECK(animations_.count(animation) == 0);  // Start should only be invoked
+                                              // if the animation isn't running.
+
+  if (animations_.empty()) {
+    last_tick_time_ = TimeTicks::Now();
+    SetMinTimerInterval(animation->timer_interval());
+  } else if (animation->timer_interval() < min_timer_interval_) {
+    SetMinTimerInterval(animation->timer_interval());
+  }
+
+  animation->set_start_time(last_tick_time_);
+  animations_.insert(animation);
+}
+
+void AnimationContainer::Stop(Animation* animation) {
+  DCHECK(animations_.count(animation) > 0);  // The animation must be running.
+
+  animations_.erase(animation);
+
+  if (animations_.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() {
+  TimeTicks current_time = TimeTicks::Now();
+
+  last_tick_time_ = current_time;
+
+  // Make a copy of the animations to iterate over so that if any animations
+  // are removed as part of invoking Step there aren't any problems.
+  Animations animations = animations_;
+
+  for (Animations::const_iterator i = animations.begin();
+       i != animations.end(); ++i) {
+    // Make sure the animation is still valid.
+    if (animations_.find(*i) != animations_.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 current animation 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(!animations_.empty());
+
+  TimeDelta min;
+  Animations::const_iterator i = animations_.begin();
+  min = (*i)->timer_interval();
+  for (++i; i != animations_.end(); ++i) {
+    if ((*i)->timer_interval() < min)
+      min = (*i)->timer_interval();
+  }
+  return min;
+}