Upstream version 5.34.104.0
[platform/framework/web/crosswalk.git] / src / third_party / WebKit / Source / core / page / FocusController.h
1 /*
2  * Copyright (C) 2006, 2007 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 COMPUTER, 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 COMPUTER, 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 #ifndef FocusController_h
27 #define FocusController_h
28
29 #include "core/page/FocusType.h"
30 #include "platform/geometry/LayoutRect.h"
31 #include "wtf/Forward.h"
32 #include "wtf/Noncopyable.h"
33 #include "wtf/RefPtr.h"
34
35 namespace WebCore {
36
37 struct FocusCandidate;
38 class Document;
39 class Element;
40 class Frame;
41 class HTMLFrameOwnerElement;
42 class HTMLShadowElement;
43 class IntRect;
44 class KeyboardEvent;
45 class Node;
46 class Page;
47 class TreeScope;
48
49 class FocusNavigationScope {
50 public:
51     Node* rootNode() const;
52     Element* owner() const;
53     static FocusNavigationScope focusNavigationScopeOf(Node*);
54     static FocusNavigationScope ownedByNonFocusableFocusScopeOwner(Node*);
55     static FocusNavigationScope ownedByShadowHost(Node*);
56     static FocusNavigationScope ownedByShadowInsertionPoint(HTMLShadowElement*);
57     static FocusNavigationScope ownedByIFrame(HTMLFrameOwnerElement*);
58
59 private:
60     explicit FocusNavigationScope(TreeScope*);
61     TreeScope* m_rootTreeScope;
62 };
63
64 class FocusController {
65     WTF_MAKE_NONCOPYABLE(FocusController); WTF_MAKE_FAST_ALLOCATED;
66 public:
67     static PassOwnPtr<FocusController> create(Page*);
68
69     void setFocusedFrame(PassRefPtr<Frame>);
70     Frame* focusedFrame() const { return m_focusedFrame.get(); }
71     Frame* focusedOrMainFrame() const;
72
73     bool setInitialFocus(FocusType);
74     bool advanceFocus(FocusType type) { return advanceFocus(type, false); }
75
76     bool setFocusedElement(Element*, PassRefPtr<Frame>, FocusType = FocusTypeNone);
77
78     void setActive(bool);
79     bool isActive() const { return m_isActive; }
80
81     void setFocused(bool);
82     bool isFocused() const { return m_isFocused; }
83
84     void setContainingWindowIsVisible(bool);
85     bool containingWindowIsVisible() const { return m_containingWindowIsVisible; }
86
87 private:
88     explicit FocusController(Page*);
89
90     bool advanceFocus(FocusType, bool initialFocus);
91     bool advanceFocusDirectionally(FocusType);
92     bool advanceFocusInDocumentOrder(FocusType, bool initialFocus);
93
94     Node* findFocusableNodeAcrossFocusScope(FocusType, FocusNavigationScope startScope, Node* start);
95     Node* findFocusableNodeRecursively(FocusType, FocusNavigationScope, Node* start);
96     Node* findFocusableNodeDecendingDownIntoFrameDocument(FocusType, Node*);
97
98     // Searches through the given tree scope, starting from start node, for the next/previous selectable element that comes after/before start node.
99     // The order followed is as specified in section 17.11.1 of the HTML4 spec, which is elements with tab indexes
100     // first (from lowest to highest), and then elements without tab indexes (in document order).
101     //
102     // @param start The node from which to start searching. The node after this will be focused. May be null.
103     //
104     // @return The focus node that comes after/before start node.
105     //
106     // See http://www.w3.org/TR/html4/interact/forms.html#h-17.11.1
107     inline Node* findFocusableNode(FocusType, FocusNavigationScope, Node* start);
108
109     Node* nextFocusableNode(FocusNavigationScope, Node* start);
110     Node* previousFocusableNode(FocusNavigationScope, Node* start);
111
112     Node* findNodeWithExactTabIndex(Node* start, int tabIndex, FocusType);
113
114     bool advanceFocusDirectionallyInContainer(Node* container, const LayoutRect& startingRect, FocusType);
115     void findFocusCandidateInContainer(Node& container, const LayoutRect& startingRect, FocusType, FocusCandidate& closest);
116
117     Page* m_page;
118     RefPtr<Frame> m_focusedFrame;
119     bool m_isActive;
120     bool m_isFocused;
121     bool m_isChangingFocusedFrame;
122     bool m_containingWindowIsVisible;
123
124 };
125
126 } // namespace WebCore
127
128 #endif // FocusController_h