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// Copyright 2012 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 CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_LINEAR_FADE_H_
#define CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_LINEAR_FADE_H_
#include "base/memory/scoped_ptr.h"
#include "cc/animation/scrollbar_animation_controller.h"
#include "cc/base/cc_export.h"
namespace cc {
class LayerImpl;
class CC_EXPORT ScrollbarAnimationControllerLinearFade
: public ScrollbarAnimationController {
public:
static scoped_ptr<ScrollbarAnimationControllerLinearFade> Create(
LayerImpl* scroll_layer,
ScrollbarAnimationControllerClient* client,
base::TimeDelta delay_before_starting,
base::TimeDelta duration);
virtual ~ScrollbarAnimationControllerLinearFade();
virtual void DidScrollUpdate() OVERRIDE;
protected:
ScrollbarAnimationControllerLinearFade(
LayerImpl* scroll_layer,
ScrollbarAnimationControllerClient* client,
base::TimeDelta delay_before_starting,
base::TimeDelta duration);
virtual void RunAnimationFrame(float progress) OVERRIDE;
private:
float OpacityAtTime(base::TimeTicks now) const;
void ApplyOpacityToScrollbars(float opacity);
LayerImpl* scroll_layer_;
DISALLOW_COPY_AND_ASSIGN(ScrollbarAnimationControllerLinearFade);
};
} // namespace cc
#endif // CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_LINEAR_FADE_H_
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