1 files changed, 31 insertions, 0 deletions
diff --git a/ui/base/animation/animation_container_observer.h b/ui/base/animation/animation_container_observer.h
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+++ b/ui/base/animation/animation_container_observer.h
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+// 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.
+
+#ifndef UI_BASE_ANIMATION_ANIMATION_CONTAINER_OBSERVER_H_
+#define UI_BASE_ANIMATION_ANIMATION_CONTAINER_OBSERVER_H_
+#pragma once
+
+namespace ui {
+
+class AnimationContainer;
+
+// The observer is notified after every update of the animations managed by
+// the container.
+class AnimationContainerObserver {
+ public:
+  // Invoked on every tick of the timer managed by the container and after
+  // all the animations have updated.
+  virtual void AnimationContainerProgressed(
+      AnimationContainer* container) = 0;
+
+  // Invoked when no more animations are being managed by this container.
+  virtual void AnimationContainerEmpty(AnimationContainer* container) = 0;
+
+ protected:
+  virtual ~AnimationContainerObserver() {}
+};
+
+}  // namespace ui
+
+#endif  // UI_BASE_ANIMATION_ANIMATION_CONTAINER_OBSERVER_H_