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/*
* Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef FocusController_h
#define FocusController_h
#include "core/page/FocusType.h"
#include "platform/geometry/LayoutRect.h"
#include "platform/heap/Handle.h"
#include "wtf/Forward.h"
#include "wtf/Noncopyable.h"
#include "wtf/RefPtr.h"
namespace WebCore {
struct FocusCandidate;
class Document;
class Element;
class Frame;
class HTMLFrameOwnerElement;
class HTMLShadowElement;
class IntRect;
class KeyboardEvent;
class Node;
class Page;
class TreeScope;
class FocusNavigationScope {
STACK_ALLOCATED();
public:
Node* rootNode() const;
Element* owner() const;
static FocusNavigationScope focusNavigationScopeOf(Node*);
static FocusNavigationScope ownedByNonFocusableFocusScopeOwner(Node*);
static FocusNavigationScope ownedByShadowHost(Node*);
static FocusNavigationScope ownedByShadowInsertionPoint(HTMLShadowElement*);
static FocusNavigationScope ownedByIFrame(HTMLFrameOwnerElement*);
private:
explicit FocusNavigationScope(TreeScope*);
RawPtrWillBeMember<TreeScope> m_rootTreeScope;
};
class FocusController {
WTF_MAKE_NONCOPYABLE(FocusController); WTF_MAKE_FAST_ALLOCATED;
public:
static PassOwnPtr<FocusController> create(Page*);
void setFocusedFrame(PassRefPtr<Frame>);
void focusDocumentView(PassRefPtr<Frame>);
Frame* focusedFrame() const { return m_focusedFrame.get(); }
Frame* focusedOrMainFrame() const;
bool setInitialFocus(FocusType);
bool advanceFocus(FocusType type) { return advanceFocus(type, false); }
bool setFocusedElement(Element*, PassRefPtr<Frame>, FocusType = FocusTypeNone);
void setActive(bool);
bool isActive() const { return m_isActive; }
void setFocused(bool);
bool isFocused() const { return m_isFocused; }
private:
explicit FocusController(Page*);
bool advanceFocus(FocusType, bool initialFocus);
bool advanceFocusDirectionally(FocusType);
bool advanceFocusInDocumentOrder(FocusType, bool initialFocus);
Node* findFocusableNodeAcrossFocusScope(FocusType, FocusNavigationScope startScope, Node* start);
Node* findFocusableNodeRecursively(FocusType, FocusNavigationScope, Node* start);
Node* findFocusableNodeDecendingDownIntoFrameDocument(FocusType, Node*);
// Searches through the given tree scope, starting from start node, for the next/previous selectable element that comes after/before start node.
// The order followed is as specified in section 17.11.1 of the HTML4 spec, which is elements with tab indexes
// first (from lowest to highest), and then elements without tab indexes (in document order).
//
// @param start The node from which to start searching. The node after this will be focused. May be null.
//
// @return The focus node that comes after/before start node.
//
// See http://www.w3.org/TR/html4/interact/forms.html#h-17.11.1
inline Node* findFocusableNode(FocusType, FocusNavigationScope, Node* start);
Node* nextFocusableNode(FocusNavigationScope, Node* start);
Node* previousFocusableNode(FocusNavigationScope, Node* start);
Node* findNodeWithExactTabIndex(Node* start, int tabIndex, FocusType);
bool advanceFocusDirectionallyInContainer(Node* container, const LayoutRect& startingRect, FocusType);
void findFocusCandidateInContainer(Node& container, const LayoutRect& startingRect, FocusType, FocusCandidate& closest);
Page* m_page;
RefPtr<Frame> m_focusedFrame;
bool m_isActive;
bool m_isFocused;
bool m_isChangingFocusedFrame;
};
} // namespace WebCore
#endif // FocusController_h
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