source: trunk/doc/src/snippets/textdocument-tables/xmlwriter.cpp@ 624

/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation ([email protected])
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at [email protected].
** $QT_END_LICENSE$
**
****************************************************************************/

#include <QtGui>

#include "xmlwriter.h"

QDomDocument *XmlWriter::toXml()
{
    QDomImplementation implementation;
    QDomDocumentType docType = implementation.createDocumentType(
        "scribe-document", "scribe", "qt.nokia.com/scribe");

    document = new QDomDocument(docType);

    // ### This processing instruction is required to ensure that any kind
    // of encoding is given when the document is written.
    QDomProcessingInstruction process = document->createProcessingInstruction(
        "xml", "version=\"1.0\" encoding=\"utf-8\"");
    document->appendChild(process);

    QDomElement documentElement = document->createElement("document");
    document->appendChild(documentElement);

    QTextFrame *root = textDocument->rootFrame();
    
    if (root)
        processFrame(documentElement, root);

    return document;
}

void XmlWriter::processBlock(QDomElement &parent, const QTextBlock &block)
{
    QDomElement blockElement = document->createElement("block");
    blockElement.setAttribute("position", block.position());
    blockElement.setAttribute("length", block.length());
    parent.appendChild(blockElement);

    QTextBlock::iterator it;
    for (it = block.begin(); !(it.atEnd()); ++it) {
        QTextFragment fragment = it.fragment();

        if (fragment.isValid()) {
            QDomElement fragmentElement = document->createElement("fragment");
            blockElement.appendChild(fragmentElement);

            fragmentElement.setAttribute("length", fragment.length());
            QDomText fragmentText = document->createTextNode(fragment.text());

            fragmentElement.appendChild(fragmentText);
        }
    }
}

void XmlWriter::processFrame(QDomElement &parent, QTextFrame *frame)
{
    QDomElement frameElement = document->createElement("frame");
    frameElement.setAttribute("begin", frame->firstPosition());
    frameElement.setAttribute("end", frame->lastPosition());
    parent.appendChild(frameElement);

//! [0]
    QTextFrame::iterator it;
    for (it = frame->begin(); !(it.atEnd()); ++it) {

        QTextFrame *childFrame = it.currentFrame();
        QTextBlock childBlock = it.currentBlock();

        if (childFrame) {
            QTextTable *childTable = qobject_cast<QTextTable*>(childFrame);

            if (childTable)
                processTable(frameElement, childTable);
            else
                processFrame(frameElement, childFrame);

        } else if (childBlock.isValid())
//! [0] //! [1]
            processBlock(frameElement, childBlock);
    }
//! [1]
}

void XmlWriter::processTable(QDomElement &parent, QTextTable *table)
{
    QDomElement element = document->createElement("table");

    for (int row = 0; row < table->rows(); ++row) {
        for (int column = 0; column < table->columns(); ++column) {
            QTextTableCell cell = table->cellAt(row, column);
            processTableCell(element, cell);
        }
    }
    parent.appendChild(element);
}

void XmlWriter::processTableCell(QDomElement &parent, const QTextTableCell &cell)
{
    QDomElement element = document->createElement("cell");
    element.setAttribute("row", cell.row());
    element.setAttribute("column", cell.column());
    
    QTextFrame::iterator it;
    for (it = cell.begin(); !(it.atEnd()); ++it) {

        QTextFrame *childFrame = it.currentFrame();
        QTextBlock childBlock = it.currentBlock();

        if (childFrame)
            processFrame(element, childFrame);
        else if (childBlock.isValid())
            processBlock(element, childBlock);
    }
    parent.appendChild(element);
}