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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_
#include "base/time/time.h"
#include "ui/base/ui_export.h"
namespace ui {
// Interface for the elements the AnimationContainer contains. This is
// implemented by Animation.
class UI_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 ui
#endif // UI_BASE_ANIMATION_ANIMATION_CONTAINER_ELEMENT_H_
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