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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_H_
#define CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_H_
#include "base/cancelable_callback.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "cc/base/cc_export.h"
#include "cc/layers/layer_impl.h"
#include "ui/gfx/geometry/vector2d_f.h"
namespace cc {
class ScrollbarAnimationController;
class CC_EXPORT ScrollbarAnimationControllerClient {
public:
virtual void StartAnimatingScrollbarAnimationController(
ScrollbarAnimationController* controller) = 0;
virtual void StopAnimatingScrollbarAnimationController(
ScrollbarAnimationController* controller) = 0;
virtual void PostDelayedScrollbarAnimationTask(const base::Closure& task,
base::TimeDelta delay) = 0;
virtual void SetNeedsRedrawForScrollbarAnimation() = 0;
protected:
virtual ~ScrollbarAnimationControllerClient() {}
};
// This abstract class represents the compositor-side analogy of
// ScrollbarAnimator. Individual platforms should subclass it to provide
// specialized implementation.
class CC_EXPORT ScrollbarAnimationController {
public:
virtual ~ScrollbarAnimationController();
void Animate(base::TimeTicks now);
virtual void DidScrollBegin();
virtual void DidScrollUpdate(bool on_resize);
virtual void DidScrollEnd();
virtual void DidMouseMoveOffScrollbar() {}
virtual void DidMouseMoveNear(float distance) {}
protected:
ScrollbarAnimationController(LayerImpl* scroll_layer,
ScrollbarAnimationControllerClient* client,
base::TimeDelta delay_before_starting,
base::TimeDelta resize_delay_before_starting,
base::TimeDelta duration);
virtual void RunAnimationFrame(float progress) = 0;
void StartAnimation();
void StopAnimation();
LayerImpl* scroll_layer_;
ScrollbarAnimationControllerClient* client_;
private:
// Returns how far through the animation we are as a progress value from
// 0 to 1.
float AnimationProgressAtTime(base::TimeTicks now);
void PostDelayedAnimationTask(bool on_resize);
base::TimeTicks last_awaken_time_;
base::TimeDelta delay_before_starting_;
base::TimeDelta resize_delay_before_starting_;
base::TimeDelta duration_;
bool is_animating_;
bool currently_scrolling_;
bool scroll_gesture_has_scrolled_;
base::CancelableClosure delayed_scrollbar_fade_;
base::WeakPtrFactory<ScrollbarAnimationController> weak_factory_;
};
} // namespace cc
#endif // CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_H_
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