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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_SCROLLBAR_ANIMATION_CONTROLLER_H_
#define CC_SCROLLBAR_ANIMATION_CONTROLLER_H_
#include "base/memory/scoped_ptr.h"
#include "cc/cc_export.h"
#include "ui/gfx/size.h"
#include "ui/gfx/vector2d.h"
#include "ui/gfx/vector2d_f.h"
namespace cc {
class LayerImpl;
class ScrollbarLayerImpl;
// This abstract class represents the compositor-side analogy of ScrollbarAnimator.
// Individual platforms should subclass it to provide specialized implementation.
class CC_EXPORT ScrollbarAnimationController {
public:
static scoped_ptr<ScrollbarAnimationController> create(LayerImpl* scrollLayer);
virtual ~ScrollbarAnimationController();
virtual bool animate(double monotonicTime);
void didPinchGestureBegin();
void didPinchGestureUpdate();
void didPinchGestureEnd();
void updateScrollOffset(LayerImpl* scrollLayer);
void setHorizontalScrollbarLayer(ScrollbarLayerImpl* layer) { m_horizontalScrollbarLayer = layer; }
ScrollbarLayerImpl* horizontalScrollbarLayer() const { return m_horizontalScrollbarLayer; }
void setVerticalScrollbarLayer(ScrollbarLayerImpl* layer) { m_verticalScrollbarLayer = layer; }
ScrollbarLayerImpl* verticalScrollbarLayer() const { return m_verticalScrollbarLayer; }
gfx::Vector2dF currentOffset() const { return m_currentOffset; }
gfx::Size totalSize() const { return m_totalSize; }
gfx::Vector2d maximum() const { return m_maximum; }
virtual void didPinchGestureBeginAtTime(double monotonicTime) { }
virtual void didPinchGestureUpdateAtTime(double monotonicTime) { }
virtual void didPinchGestureEndAtTime(double monotonicTime) { }
virtual void updateScrollOffsetAtTime(LayerImpl* scrollLayer, double monotonicTime);
protected:
explicit ScrollbarAnimationController(LayerImpl* scrollLayer);
private:
static gfx::Size getScrollLayerBounds(const LayerImpl*);
// Beware of dangling pointer. Always update these during tree synchronization.
ScrollbarLayerImpl* m_horizontalScrollbarLayer;
ScrollbarLayerImpl* m_verticalScrollbarLayer;
gfx::Vector2dF m_currentOffset;
gfx::Size m_totalSize;
gfx::Vector2d m_maximum;
};
} // namespace cc
#endif // CC_SCROLLBAR_ANIMATION_CONTROLLER_H_
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