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26 #ifndef FocusController_h
27 #define FocusController_h
29 #include "FocusDirection.h"
30 #include "LayoutTypes.h"
31 #include <wtf/Forward.h>
32 #include <wtf/Noncopyable.h>
33 #include <wtf/RefPtr.h>
37 struct FocusCandidate;
46 class FocusController {
47 WTF_MAKE_NONCOPYABLE(FocusController); WTF_MAKE_FAST_ALLOCATED;
49 FocusController(Page*);
51 void setFocusedFrame(PassRefPtr<Frame>);
52 Frame* focusedFrame() const { return m_focusedFrame.get(); }
53 Frame* focusedOrMainFrame() const;
55 bool setInitialFocus(FocusDirection, KeyboardEvent*);
56 bool advanceFocus(FocusDirection, KeyboardEvent*, bool initialFocus = false);
58 bool setFocusedNode(Node*, PassRefPtr<Frame>);
61 bool isActive() const { return m_isActive; }
63 void setFocused(bool);
64 bool isFocused() const { return m_isFocused; }
66 bool transferFocusToElementInShadowRoot(Element* shadowHost, bool restorePreviousSelection);
69 bool advanceFocusDirectionally(FocusDirection, KeyboardEvent*);
70 bool advanceFocusInDocumentOrder(FocusDirection, KeyboardEvent*, bool initialFocus);
72 Node* findFocusableNodeAcrossTreeScope(FocusDirection, TreeScope* startScope, Node* start, KeyboardEvent*);
73 Node* findFocusableNodeDecendingDownIntoFrameDocumentOrShadowRoot(FocusDirection, Node*, KeyboardEvent*);
75 // Searches through the given tree scope, starting from start node, for the next/previous selectable element that comes after/before start node.
76 // The order followed is as specified in section 17.11.1 of the HTML4 spec, which is elements with tab indexes
77 // first (from lowest to highest), and then elements without tab indexes (in document order).
79 // @param start The node from which to start searching. The node after this will be focused. May be null.
81 // @return The focus node that comes after/before start node.
83 // See http://www.w3.org/TR/html4/interact/forms.html#h-17.11.1
84 inline Node* findFocusableNode(FocusDirection, TreeScope*, Node* start, KeyboardEvent*);
86 Node* nextFocusableNode(TreeScope*, Node* start, KeyboardEvent*);
87 Node* previousFocusableNode(TreeScope*, Node* start, KeyboardEvent*);
89 bool advanceFocusDirectionallyInContainer(Node* container, const LayoutRect& startingRect, FocusDirection, KeyboardEvent*);
90 void findFocusCandidateInContainer(Node* container, const LayoutRect& startingRect, FocusDirection, KeyboardEvent*, FocusCandidate& closest);
93 RefPtr<Frame> m_focusedFrame;
96 bool m_isChangingFocusedFrame;
100 } // namespace WebCore
102 #endif // FocusController_h