1/*
2 * Copyright (C) 2012 Google Inc. All rights reserved.
3 * Copyright (C) 2013 Apple Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 *     * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *     * Neither the name of Google Inc. nor the names of its
12 * contributors may be used to endorse or promote products derived from
13 * this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
18 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
19 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
21 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#ifndef UserActionElementSet_h
29#define UserActionElementSet_h
30
31#include <wtf/HashMap.h>
32#include <wtf/PassRefPtr.h>
33#include <wtf/RefPtr.h>
34
35namespace WebCore {
36
37class Element;
38
39class UserActionElementSet {
40public:
41    bool isFocused(const Element* element) { return hasFlags(element, IsFocusedFlag); }
42    bool isActive(const Element* element) { return hasFlags(element, IsActiveFlag); }
43    bool isInActiveChain(const Element* element) { return hasFlags(element, InActiveChainFlag); }
44    bool isHovered(const Element* element) { return hasFlags(element, IsHoveredFlag); }
45    void setFocused(Element* element, bool enable) { setFlags(element, enable, IsFocusedFlag); }
46    void setActive(Element* element, bool enable) { setFlags(element, enable, IsActiveFlag); }
47    void setInActiveChain(Element* element, bool enable) { setFlags(element, enable, InActiveChainFlag); }
48    void setHovered(Element* element, bool enable) { setFlags(element, enable, IsHoveredFlag); }
49
50    void didDetach(Element*);
51    void documentDidRemoveLastRef();
52
53private:
54    enum ElementFlags {
55        IsActiveFlag      = 1 ,
56        InActiveChainFlag = 1 << 1,
57        IsHoveredFlag     = 1 << 2,
58        IsFocusedFlag     = 1 << 3
59    };
60
61    void setFlags(Element* element, bool enable, unsigned flags) { enable ? setFlags(element, flags) : clearFlags(element, flags); }
62    void setFlags(Element*, unsigned);
63    void clearFlags(Element*, unsigned);
64    bool hasFlags(const Element*, unsigned flags) const;
65
66    typedef HashMap<RefPtr<Element>, unsigned> ElementFlagMap;
67    ElementFlagMap m_elements;
68};
69
70} // namespace
71
72#endif // UserActionElementSet_h
73