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26 #ifndef FocusController_h
27 #define FocusController_h
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"
37 struct FocusCandidate;
41 class HTMLFrameOwnerElement;
42 class HTMLShadowElement;
49 class FocusNavigationScope {
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*);
60 explicit FocusNavigationScope(TreeScope*);
61 TreeScope* m_rootTreeScope;
64 class FocusController {
65 WTF_MAKE_NONCOPYABLE(FocusController); WTF_MAKE_FAST_ALLOCATED;
67 static PassOwnPtr<FocusController> create(Page*);
69 void setFocusedFrame(PassRefPtr<Frame>);
70 Frame* focusedFrame() const { return m_focusedFrame.get(); }
71 Frame* focusedOrMainFrame() const;
73 bool setInitialFocus(FocusType);
74 bool advanceFocus(FocusType type) { return advanceFocus(type, false); }
76 bool setFocusedElement(Element*, PassRefPtr<Frame>, FocusType = FocusTypeNone);
79 bool isActive() const { return m_isActive; }
81 void setFocused(bool);
82 bool isFocused() const { return m_isFocused; }
84 void setContainingWindowIsVisible(bool);
85 bool containingWindowIsVisible() const { return m_containingWindowIsVisible; }
88 explicit FocusController(Page*);
90 bool advanceFocus(FocusType, bool initialFocus);
91 bool advanceFocusDirectionally(FocusType);
92 bool advanceFocusInDocumentOrder(FocusType, bool initialFocus);
94 Node* findFocusableNodeAcrossFocusScope(FocusType, FocusNavigationScope startScope, Node* start);
95 Node* findFocusableNodeRecursively(FocusType, FocusNavigationScope, Node* start);
96 Node* findFocusableNodeDecendingDownIntoFrameDocument(FocusType, Node*);
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).
102 // @param start The node from which to start searching. The node after this will be focused. May be null.
104 // @return The focus node that comes after/before start node.
106 // See http://www.w3.org/TR/html4/interact/forms.html#h-17.11.1
107 inline Node* findFocusableNode(FocusType, FocusNavigationScope, Node* start);
109 Node* nextFocusableNode(FocusNavigationScope, Node* start);
110 Node* previousFocusableNode(FocusNavigationScope, Node* start);
112 Node* findNodeWithExactTabIndex(Node* start, int tabIndex, FocusType);
114 bool advanceFocusDirectionallyInContainer(Node* container, const LayoutRect& startingRect, FocusType);
115 void findFocusCandidateInContainer(Node& container, const LayoutRect& startingRect, FocusType, FocusCandidate& closest);
118 RefPtr<Frame> m_focusedFrame;
121 bool m_isChangingFocusedFrame;
122 bool m_containingWindowIsVisible;
126 } // namespace WebCore
128 #endif // FocusController_h