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# xbelgenerator.cpp Example File
xml/saxbookmarks/xbelgenerator.cpp

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        ** This file is part of the documentation of the Qt Toolkit.
        **
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    ** as defined by Trolltech AS of Norway and appearing in the file
    ** LICENSE.QPL included in the packaging of this file.
    **
    ** This file may be distributed and/or modified under the terms of the
    ** GNU General Public License version 2 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.GPL included in the
    ** packaging of this file.
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        #include <QtGui>

        #include "xbelgenerator.h"

        XbelGenerator::XbelGenerator(QTreeWidget *treeWidget)
            : treeWidget(treeWidget)
        {
        }

        bool XbelGenerator::write(QIODevice *device)
        {
            out.setDevice(device);
            out.setCodec("UTF-8");
            out << "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
                << "<!DOCTYPE xbel>\n"
                << "<xbel version=\"1.0\">\n";

            for (int i = 0; i < treeWidget->topLevelItemCount(); ++i)
                generateItem(treeWidget->topLevelItem(i), 1);

            out << "</xbel>\n";
            return true;
        }

        QString XbelGenerator::indent(int depth)
        {
            const int IndentSize = 4;
            return QString(IndentSize * depth, ' ');
        }

        QString XbelGenerator::escapedText(const QString &str)
        {
            QString result = str;
            result.replace("&", "&amp;");
            result.replace("<", "&lt;");
            result.replace(">", "&gt;");
            return result;
        }

        QString XbelGenerator::escapedAttribute(const QString &str)
        {
            QString result = escapedText(str);
            result.replace("\"", "&quot;");
            result.prepend("\"");
            result.append("\"");
            return result;
        }

        void XbelGenerator::generateItem(QTreeWidgetItem *item, int depth)
        {
            QString tagName = item->data(0, Qt::UserRole).toString();
            if (tagName == "folder") {
                bool folded = !treeWidget->isItemExpanded(item);
                out << indent(depth) << "<folder folded=\"" << (folded ? "yes" : "no")
                                     << "\">\n"
                    << indent(depth + 1) << "<title>" << escapedText(item->text(0))
                                         << "</title>\n";

                for (int i = 0; i < item->childCount(); ++i)
                    generateItem(item->child(i), depth + 1);

                out << indent(depth) << "</folder>\n";
            } else if (tagName == "bookmark") {
                out << indent(depth) << "<bookmark";
                if (!item->text(1).isEmpty())
                    out << " href=" << escapedAttribute(item->text(1));
                out << ">\n"
                    << indent(depth + 1) << "<title>" << escapedText(item->text(0))
                                         << "</title>\n"
                    << indent(depth) << "</bookmark>\n";
            } else if (tagName == "separator") {
                out << indent(depth) << "<separator/>\n";
            }
        }