File: animation_container_element.h

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// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_GFX_ANIMATION_ANIMATION_CONTAINER_ELEMENT_H_
#define UI_GFX_ANIMATION_ANIMATION_CONTAINER_ELEMENT_H_

#include "base/time/time.h"
#include "ui/gfx/animation/animation_export.h"

namespace gfx {

// Interface for the elements the AnimationContainer contains. This is
// implemented by Animation.
class ANIMATION_EXPORT 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 gfx

#endif  // UI_GFX_ANIMATION_ANIMATION_CONTAINER_ELEMENT_H_