WebCore/rendering/RenderTextFragment.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 04 Oct 2010 01:32:07 +0300
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/*
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 * (C) 1999 Lars Knoll (knoll@kde.org)
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 * (C) 2000 Dirk Mueller (mueller@kde.org)
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 * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Library General Public
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 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Library General Public License for more details.
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 *
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 * You should have received a copy of the GNU Library General Public License
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 * along with this library; see the file COPYING.LIB.  If not, write to
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 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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 * Boston, MA 02110-1301, USA.
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 *
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 */
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#include "config.h"
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#include "RenderTextFragment.h"
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#include "Text.h"
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namespace WebCore {
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RenderTextFragment::RenderTextFragment(Node* node, StringImpl* str, int startOffset, int length)
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    : RenderText(node, str ? str->substring(startOffset, length) : 0)
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    , m_start(startOffset)
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    , m_end(length)
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    , m_firstLetter(0)
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{
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}
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RenderTextFragment::RenderTextFragment(Node* node, StringImpl* str)
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    : RenderText(node, str)
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    , m_start(0)
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    , m_end(str ? str->length() : 0)
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    , m_contentString(str)
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    , m_firstLetter(0)
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{
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}
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PassRefPtr<StringImpl> RenderTextFragment::originalText() const
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{
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    Node* e = node();
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    RefPtr<StringImpl> result = ((e && e->isTextNode()) ? static_cast<Text*>(e)->dataImpl() : contentString());
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    if (result && (start() > 0 || start() < result->length()))
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        result = result->substring(start(), end());
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    return result.release();
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}
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void RenderTextFragment::destroy()
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{
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    if (m_firstLetter)
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        m_firstLetter->destroy();
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    RenderText::destroy();
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}
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void RenderTextFragment::setTextInternal(PassRefPtr<StringImpl> text)
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{
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    RenderText::setTextInternal(text);
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    if (m_firstLetter) {
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        ASSERT(!m_contentString);
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        m_firstLetter->destroy();
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        m_firstLetter = 0;
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        m_start = 0;
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        m_end = textLength();
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        if (Node* t = node()) {
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            ASSERT(!t->renderer());
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            t->setRenderer(this);
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        }
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    }
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}
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UChar RenderTextFragment::previousCharacter() const
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{
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    if (start()) {
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        Node* e = node();
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        StringImpl*  original = ((e && e->isTextNode()) ? static_cast<Text*>(e)->dataImpl() : contentString());
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        if (original)
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            return (*original)[start() - 1];
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    }
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    return RenderText::previousCharacter();
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}
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} // namespace WebCore