setnodeattributecommand.cpp

来自「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Web」· C++ 代码 · 共 58 行

/*
 * Copyright (C) 2005, 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.
 *
 * 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. 
 */

#include "config.h"
#include "SetNodeAttributeCommand.h"

#include "Element.h"
#include <wtf/Assertions.h>

namespace WebCore {

SetNodeAttributeCommand::SetNodeAttributeCommand(PassRefPtr<Element> element, 
        const QualifiedName& attribute, const AtomicString& value)
    : SimpleEditCommand(element->document())
    , m_element(element)
    , m_attribute(attribute)
    , m_value(value)
{
    ASSERT(m_element);
}

void SetNodeAttributeCommand::doApply()
{
    m_oldValue = m_element->getAttribute(m_attribute);
    m_element->setAttribute(m_attribute, m_value);
}

void SetNodeAttributeCommand::doUnapply()
{
    m_element->setAttribute(m_attribute, m_oldValue);
    AtomicStringImpl* nullString = 0;
    m_oldValue = nullString;
}

} // namespace WebCore