accessibilityobject.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2008 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.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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.
 */

#include "config.h"
#include "AccessibilityObject.h"

#include "AccessibilityRenderObject.h"
#include "AXObjectCache.h"
#include "CharacterNames.h"
#include "FloatRect.h"
#include "FocusController.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "LocalizedStrings.h"
#include "NodeList.h"
#include "NotImplemented.h"
#include "Page.h"
#include "RenderImage.h"
#include "RenderListMarker.h"
#include "RenderMenuList.h"
#include "RenderTextControl.h"
#include "RenderTheme.h"
#include "RenderView.h"
#include "RenderWidget.h"
#include "SelectionController.h"
#include "TextIterator.h"
#include "htmlediting.h"
#include "visible_units.h"
#include <wtf/StdLibExtras.h>

using namespace std;

namespace WebCore {

using namespace HTMLNames;

AccessibilityObject::AccessibilityObject()
    : m_id(0)
    , m_haveChildren(false)
#if PLATFORM(GTK)
    , m_wrapper(0)
#endif
{
}

AccessibilityObject::~AccessibilityObject()
{
    ASSERT(isDetached());
}

void AccessibilityObject::detach()
{
#if HAVE(ACCESSIBILITY)
    setWrapper(0);
#endif    
}

AccessibilityObject* AccessibilityObject::firstChild() const
{
    return 0;
}

AccessibilityObject* AccessibilityObject::lastChild() const
{
    return 0;
}

AccessibilityObject* AccessibilityObject::previousSibling() const
{
    return 0;
}

AccessibilityObject* AccessibilityObject::nextSibling() const
{
    return 0;
}

AccessibilityObject* AccessibilityObject::parentObject() const
{
    return 0;
}

AccessibilityObject* AccessibilityObject::parentObjectUnignored() const
{
    AccessibilityObject* parent;
    for (parent = parentObject(); parent && parent->accessibilityIsIgnored(); parent = parent->parentObject())
        ;
    return parent;
}

AccessibilityObject* AccessibilityObject::parentObjectIfExists() const
{
    return 0;
}
    
int AccessibilityObject::layoutCount() const
{
    return 0;
}
    
String AccessibilityObject::text() const
{
    return String();
}
    
String AccessibilityObject::helpText() const
{
    return String();   
}

String AccessibilityObject::textUnderElement() const
{
    return String();
}

bool AccessibilityObject::isARIAInput(AccessibilityRole ariaRole)
{
    return ariaRole == RadioButtonRole || ariaRole == CheckBoxRole || ariaRole == TextFieldRole;
}    
    
bool AccessibilityObject::isARIAControl(AccessibilityRole ariaRole)
{
    return isARIAInput(ariaRole) || ariaRole == TextAreaRole || ariaRole == ButtonRole 
    || ariaRole == ComboBoxRole || ariaRole == SliderRole; 
}
    
int AccessibilityObject::intValue() const
{
    return 0;
}

String AccessibilityObject::stringValue() const
{
    return String();
}

String AccessibilityObject::ariaAccessiblityName(const String&) const
{
    return String();
}

String AccessibilityObject::ariaLabeledByAttribute() const
{
    return String();
}

String AccessibilityObject::title() const
{
    return String();
}

String AccessibilityObject::ariaDescribedByAttribute() const
{
    return String();
}

String AccessibilityObject::accessibilityDescription() const
{
    return String();
}

IntRect AccessibilityObject::boundingBoxRect() const
{
    return IntRect();
}

IntRect AccessibilityObject::elementRect() const
{
    return IntRect();
}

IntSize AccessibilityObject::size() const
{
    return IntSize();
}

IntPoint AccessibilityObject::clickPoint() const
{
    IntRect rect = elementRect();
    return IntPoint(rect.x() + rect.width() / 2, rect.y() + rect.height() / 2);
}
    
void AccessibilityObject::linkedUIElements(AccessibilityChildrenVector&) const
{
    return;
}
    
AccessibilityObject* AccessibilityObject::titleUIElement() const
{
     return 0;   
}

int AccessibilityObject::textLength() const
{
    return 0;
}

PassRefPtr<Range> AccessibilityObject::ariaSelectedTextDOMRange() const
{
    return 0;
}

String AccessibilityObject::selectedText() const
{
    return String();
}

const AtomicString& AccessibilityObject::accessKey() const
{
    return nullAtom;
}

VisibleSelection AccessibilityObject::selection() const
{
    return VisibleSelection();
}

PlainTextRange AccessibilityObject::selectedTextRange() const
{
    return PlainTextRange();
}

unsigned AccessibilityObject::selectionStart() const
{
    return selectedTextRange().start;
}

unsigned AccessibilityObject::selectionEnd() const
{
    return selectedTextRange().length;
}

void AccessibilityObject::setSelectedText(const String&)
{
    // TODO: set selected text (ReplaceSelectionCommand). <rdar://problem/4712125>
    notImplemented();
}

void AccessibilityObject::setSelectedTextRange(const PlainTextRange&)
{
}

void AccessibilityObject::makeRangeVisible(const PlainTextRange&)
{
    // TODO: make range visible (scrollRectToVisible).  <rdar://problem/4712101>
    notImplemented();
}

KURL AccessibilityObject::url() const
{
    return KURL();
}

void AccessibilityObject::setFocused(bool)
{
}

void AccessibilityObject::setValue(const String&)
{
}

void AccessibilityObject::setSelected(bool)
{
}

bool AccessibilityObject::press() const
{
    Element* actionElem = actionElement();
    if (!actionElem)
        return false;
    if (Frame* f = actionElem->document()->frame())
        f->loader()->resetMultipleFormSubmissionProtection();
    actionElem->accessKeyAction(true);
    return true;
}

AXObjectCache* AccessibilityObject::axObjectCache() const
{
    return 0;
}

Widget* AccessibilityObject::widget() const
{
    return 0;
}

Widget* AccessibilityObject::widgetForAttachmentView() const
{
    return 0;
}

Element* AccessibilityObject::anchorElement() const
{
    return 0;   
}

Element* AccessibilityObject::actionElement() const
{
    return 0;
}

// This function is like a cross-platform version of - (WebCoreTextMarkerRange*)textMarkerRange. It returns
// a Range that we can convert to a WebCoreRange in the Obj-C file
VisiblePositionRange AccessibilityObject::visiblePositionRange() const
{
    return VisiblePositionRange();
}

VisiblePositionRange AccessibilityObject::visiblePositionRangeForLine(unsigned) const
{
    return VisiblePositionRange();
}

VisiblePosition AccessibilityObject::visiblePositionForIndex(int) const
{
    return VisiblePosition();
}
    
int AccessibilityObject::indexForVisiblePosition(const VisiblePosition&) const
{
    return 0;