rendertextfragment.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

/*
 * (C) 1999 Lars Knoll ([e-mail])
 * (C) 2000 Dirk Mueller ([e-mail])
 * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#include "config.h"
#include "RenderTextFragment.h"

#include "Text.h"

namespace WebCore {

RenderTextFragment::RenderTextFragment(Node* node, StringImpl* str, int startOffset, int length)
    : RenderText(node, str ? str->substring(startOffset, length) : 0)
    , m_start(startOffset)
    , m_end(length)
    , m_firstLetter(0)
{
}

RenderTextFragment::RenderTextFragment(Node* node, StringImpl* str)
    : RenderText(node, str)
    , m_start(0)
    , m_end(str ? str->length() : 0)
    , m_contentString(str)
    , m_firstLetter(0)
{
}

PassRefPtr<StringImpl> RenderTextFragment::originalText() const
{
    Node* e = node();
    RefPtr<StringImpl> result = (e ? static_cast<Text*>(e)->string() : contentString());
    if (result && (start() > 0 || start() < result->length()))
        result = result->substring(start(), end());
    return result.release();
}

void RenderTextFragment::destroy()
{
    if (m_firstLetter)
        m_firstLetter->destroy();
    RenderText::destroy();
}

void RenderTextFragment::setTextInternal(PassRefPtr<StringImpl> text)
{
    RenderText::setTextInternal(text);
    if (m_firstLetter) {
        ASSERT(!m_contentString);
        m_firstLetter->destroy();
        m_firstLetter = 0;
        m_start = 0;
        m_end = textLength();
    }
}

UChar RenderTextFragment::previousCharacter()
{
    if (start()) {
        Node* e = node();
        StringImpl*  original = (e ? static_cast<Text*>(e)->string() : contentString());
        if (original)
            return (*original)[start() - 1];
    }

    return RenderText::previousCharacter();
}

} // namespace WebCore