1/*
2 * Copyright (C) 2012 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef ScrollingTreeScrollingNodeMac_h
27#define ScrollingTreeScrollingNodeMac_h
28
29#if ENABLE(THREADED_SCROLLING)
30
31#include "ScrollElasticityController.h"
32#include "ScrollingTreeScrollingNode.h"
33#include <wtf/RetainPtr.h>
34
35OBJC_CLASS CALayer;
36
37namespace WebCore {
38
39class ScrollingTreeScrollingNodeMac : public ScrollingTreeScrollingNode, private ScrollElasticityControllerClient {
40public:
41    explicit ScrollingTreeScrollingNodeMac(ScrollingTree*, ScrollingNodeID);
42    virtual ~ScrollingTreeScrollingNodeMac();
43
44private:
45    // ScrollingTreeNode member functions.
46    virtual void updateBeforeChildren(ScrollingStateNode*) OVERRIDE;
47    virtual void updateAfterChildren(ScrollingStateNode*) OVERRIDE;
48    virtual void handleWheelEvent(const PlatformWheelEvent&) OVERRIDE;
49
50    // ScrollElasticityController member functions.
51    virtual bool allowsHorizontalStretching() OVERRIDE;
52    virtual bool allowsVerticalStretching() OVERRIDE;
53    virtual IntSize stretchAmount() OVERRIDE;
54    virtual bool pinnedInDirection(const FloatSize&) OVERRIDE;
55    virtual bool canScrollHorizontally() OVERRIDE;
56    virtual bool canScrollVertically() OVERRIDE;
57    virtual bool shouldRubberBandInDirection(ScrollDirection) OVERRIDE;
58    virtual IntPoint absoluteScrollPosition() OVERRIDE;
59    virtual void immediateScrollBy(const FloatSize&) OVERRIDE;
60    virtual void immediateScrollByWithoutContentEdgeConstraints(const FloatSize&) OVERRIDE;
61    virtual void startSnapRubberbandTimer() OVERRIDE;
62    virtual void stopSnapRubberbandTimer() OVERRIDE;
63    virtual void adjustScrollPositionToBoundsIfNecessary() OVERRIDE;
64
65    IntPoint scrollPosition() const;
66    void setScrollPosition(const IntPoint&);
67    void setScrollPositionWithoutContentEdgeConstraints(const IntPoint&);
68
69    void setScrollLayerPosition(const IntPoint&);
70
71    IntPoint minimumScrollPosition() const;
72    IntPoint maximumScrollPosition() const;
73
74    void scrollBy(const IntSize&);
75    void scrollByWithoutContentEdgeConstraints(const IntSize&);
76
77    void updateMainFramePinState(const IntPoint& scrollPosition);
78
79    void logExposedUnfilledArea();
80
81    ScrollElasticityController m_scrollElasticityController;
82    RetainPtr<CFRunLoopTimerRef> m_snapRubberbandTimer;
83
84    RetainPtr<CALayer> m_scrollLayer;
85    RetainPtr<CALayer> m_counterScrollingLayer;
86    RetainPtr<CALayer> m_headerLayer;
87    RetainPtr<CALayer> m_footerLayer;
88    IntPoint m_probableMainThreadScrollPosition;
89    bool m_lastScrollHadUnfilledPixels;
90};
91
92} // namespace WebCore
93
94#endif // ENABLE(THREADED_SCROLLING)
95
96#endif // ScrollingTreeScrollingNodeMac_h
97