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// Copyright (c) 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 UI_VIEWS_ANIMATION_SCROLL_ANIMATOR_H_
#define UI_VIEWS_ANIMATION_SCROLL_ANIMATOR_H_
#pragma once
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "ui/base/animation/animation_delegate.h"
#include "ui/views/views_export.h"
namespace ui {
class SlideAnimation;
}
namespace views {
class VIEWS_EXPORT ScrollDelegate {
public:
virtual void OnScroll(float dx, float dy) = 0;
protected:
~ScrollDelegate() {}
};
class VIEWS_EXPORT ScrollAnimator : public ui::AnimationDelegate {
public:
// The ScrollAnimator does not own the delegate. Uses default acceleration.
explicit ScrollAnimator(ScrollDelegate* delegate);
virtual ~ScrollAnimator();
// Use this if you would prefer different acceleration than the default.
void set_acceleration(float acceleration) { acceleration_ = acceleration; }
void Start(float velocity_x, float velocity_y);
void Stop();
bool is_scrolling() const { return !!animation_.get(); }
private:
// Implementation of ui::AnimationDelegate.
virtual void AnimationEnded(const ui::Animation* animation) OVERRIDE;
virtual void AnimationProgressed(const ui::Animation* animation) OVERRIDE;
virtual void AnimationCanceled(const ui::Animation* animation) OVERRIDE;
ScrollDelegate* delegate_;
float velocity_x_;
float velocity_y_;
float last_t_;
float duration_;
float acceleration_;
scoped_ptr<ui::SlideAnimation> animation_;
DISALLOW_COPY_AND_ASSIGN(ScrollAnimator);
};
} // namespace views
#endif // UI_VIEWS_ANIMATION_SCROLL_ANIMATOR_H_