1 files changed, 34 insertions, 0 deletions
diff --git a/ui/base/animation/animation_container_element.h b/ui/base/animation/animation_container_element.h
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+++ b/ui/base/animation/animation_container_element.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_ELEMENT_H_
+#define UI_BASE_ANIMATION_ANIMATION_CONTAINER_ELEMENT_H_
+#pragma once
+
+#include "base/time.h"
+
+namespace ui {
+
+// Interface for the elements the AnimationContainer contains. This is
+// implemented by Animation.
+class AnimationContainerElement {
+ public:
+  // Sets the start of the animation. This is invoked from
+  // AnimationContainer::Start.
+  virtual void SetStartTime(base::TimeTicks start_time) = 0;
+
+  // Invoked when the animation is to progress.
+  virtual void Step(base::TimeTicks time_now) = 0;
+
+  // Returns the time interval of the animation. If an Element needs to change
+  // this it should first invoke Stop, then Start.
+  virtual base::TimeDelta GetTimerInterval() const = 0;
+
+ protected:
+  virtual ~AnimationContainerElement() {}
+};
+
+}  // namespace ui
+
+#endif  // UI_BASE_ANIMATION_ANIMATION_CONTAINER_ELEMENT_H_