1/*
2 * Copyright (C) 2014 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 ScrollingTreeOverflowScrollingNodeIOS_h
27#define ScrollingTreeOverflowScrollingNodeIOS_h
28
29#if ENABLE(ASYNC_SCROLLING) && PLATFORM(IOS)
30
31#include <WebCore/ScrollingCoordinator.h>
32#include <WebCore/ScrollingTreeOverflowScrollingNode.h>
33
34OBJC_CLASS WKOverflowScrollViewDelegate;
35
36namespace WebKit {
37
38class ScrollingTreeOverflowScrollingNodeIOS : public WebCore::ScrollingTreeOverflowScrollingNode {
39public:
40    static PassRefPtr<ScrollingTreeOverflowScrollingNodeIOS> create(WebCore::ScrollingTree&, WebCore::ScrollingNodeID);
41    virtual ~ScrollingTreeOverflowScrollingNodeIOS();
42
43    void overflowScrollWillStart();
44    void overflowScrollDidEnd();
45    void overflowScrollViewWillStartPanGesture();
46    void scrollViewDidScroll(const WebCore::FloatPoint&, bool inUserInteration);
47
48    CALayer *scrollLayer() const { return m_scrollLayer.get(); }
49
50private:
51    ScrollingTreeOverflowScrollingNodeIOS(WebCore::ScrollingTree&, WebCore::ScrollingNodeID);
52
53    virtual void updateBeforeChildren(const WebCore::ScrollingStateNode&) override;
54    virtual void updateAfterChildren(const WebCore::ScrollingStateNode&) override;
55
56    virtual WebCore::FloatPoint scrollPosition() const override;
57
58    virtual void setScrollLayerPosition(const WebCore::FloatPoint&) override;
59
60    virtual void updateLayersAfterViewportChange(const WebCore::FloatRect& fixedPositionRect, double scale) { }
61    virtual void updateLayersAfterDelegatedScroll(const WebCore::FloatPoint& scrollPosition) override;
62
63    virtual void updateLayersAfterAncestorChange(const WebCore::ScrollingTreeNode& changedNode, const WebCore::FloatRect& fixedPositionRect, const WebCore::FloatSize& cumulativeDelta) override;
64
65    virtual void handleWheelEvent(const WebCore::PlatformWheelEvent&) override { }
66
67    void updateChildNodesAfterScroll(const WebCore::FloatPoint&);
68
69    RetainPtr<CALayer> m_scrollLayer;
70    RetainPtr<CALayer> m_scrolledContentsLayer;
71
72    RetainPtr<WKOverflowScrollViewDelegate> m_scrollViewDelegate;
73    bool m_updatingFromStateNode;
74};
75
76} // namespace WebKit
77
78#endif // ENABLE(ASYNC_SCROLLING) && PLATFORM(IOS)
79
80#endif // ScrollingTreeOverflowScrollingNodeIOS_h
81