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. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include <wtf/RefPtr.h>
29
30namespace WebCore {
31
32class ContainerNode;
33class Element;
34class Frame;
35
36class ScrollLatchingState final {
37public:
38 ScrollLatchingState();
39 ~ScrollLatchingState();
40
41 void clear();
42
43 Element* wheelEventElement() { return m_wheelEventElement.get(); }
44 void setWheelEventElement(Element*);
45 Frame* frame() { return m_frame; }
46 void setFrame(Frame* frame) { m_frame = frame; }
47
48 bool widgetIsLatched() const { return m_widgetIsLatched; }
49 void setWidgetIsLatched(bool isOverWidget);
50
51 Element* previousWheelScrolledElement() { return m_previousWheelScrolledElement.get(); }
52 void setPreviousWheelScrolledElement(Element*);
53
54 ContainerNode* scrollableContainer() { return m_scrollableContainer.get(); }
55 void setScrollableContainer(ContainerNode*);
56 bool startedGestureAtScrollLimit() const { return m_startedGestureAtScrollLimit; }
57 void setStartedGestureAtScrollLimit(bool startedAtLimit) { m_startedGestureAtScrollLimit = startedAtLimit; }
58
59private:
60 RefPtr<Element> m_wheelEventElement;
61 RefPtr<Element> m_previousWheelScrolledElement;
62 RefPtr<ContainerNode> m_scrollableContainer;
63
64 Frame* m_frame { nullptr };
65
66 bool m_widgetIsLatched { false };
67 bool m_startedGestureAtScrollLimit { false };
68};
69
70} // namespace WebCore
71