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

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        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** 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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    ** information about Qt Commercial License Agreements.
    ** See http://www.trolltech.com/gpl/ for GPL licensing information.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
        **
        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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        #include <QtGui>

        #include "xbelhandler.h"

        XbelHandler::XbelHandler(QTreeWidget *treeWidget)
            : treeWidget(treeWidget)
        {
            item = 0;
            metXbelTag = false;

            QStyle *style = treeWidget->style();

            folderIcon.addPixmap(style->standardPixmap(QStyle::SP_DirClosedIcon),
                                 QIcon::Normal, QIcon::Off);
            folderIcon.addPixmap(style->standardPixmap(QStyle::SP_DirOpenIcon),
                                 QIcon::Normal, QIcon::On);
            bookmarkIcon.addPixmap(style->standardPixmap(QStyle::SP_FileIcon));
        }

        bool XbelHandler::startElement(const QString & /* namespaceURI */,
                                       const QString & /* localName */,
                                       const QString &qName,
                                       const QXmlAttributes &attributes)
        {
            if (!metXbelTag && qName != "xbel") {
                errorStr = QObject::tr("The file is not an XBEL file.");
                return false;
            }

            if (qName == "xbel") {
                QString version = attributes.value("version");
                if (!version.isEmpty() && version != "1.0") {
                    errorStr = QObject::tr("The file is not an XBEL version 1.0 file.");
                    return false;
                }
                metXbelTag = true;
            } else if (qName == "folder") {
                item = createChildItem(qName);
                item->setFlags(item->flags() | Qt::ItemIsEditable);
                item->setIcon(0, folderIcon);
                item->setText(0, QObject::tr("Folder"));
                bool folded = (attributes.value("folded") != "no");
                treeWidget->setItemExpanded(item, !folded);
            } else if (qName == "bookmark") {
                item = createChildItem(qName);
                item->setFlags(item->flags() | Qt::ItemIsEditable);
                item->setIcon(0, bookmarkIcon);
                item->setText(0, QObject::tr("Unknown title"));
                item->setText(1, attributes.value("href"));
            } else if (qName == "separator") {
                item = createChildItem(qName);
                item->setFlags(item->flags() & ~Qt::ItemIsSelectable);
                item->setText(0, QString(30, 0xB7));
            }

            currentText.clear();
            return true;
        }

        bool XbelHandler::endElement(const QString & /* namespaceURI */,
                                     const QString & /* localName */,
                                     const QString &qName)
        {
            if (qName == "title") {
                if (item)
                    item->setText(0, currentText);
            } else if (qName == "folder" || qName == "bookmark"
                       || qName == "separator") {
                item = item->parent();
            }
            return true;
        }

        bool XbelHandler::characters(const QString &str)
        {
            currentText += str;
            return true;
        }

        bool XbelHandler::fatalError(const QXmlParseException &exception)
        {
            QMessageBox::information(treeWidget->window(), QObject::tr("SAX Bookmarks"),
                                     QObject::tr("Parse error at line %1, column %2:\n"
                                                 "%3")
                                     .arg(exception.lineNumber())
                                     .arg(exception.columnNumber())
                                     .arg(exception.message()));
            return false;
        }

        QString XbelHandler::errorString() const
        {
            return errorStr;
        }

        QTreeWidgetItem *XbelHandler::createChildItem(const QString &tagName)
        {
            QTreeWidgetItem *childItem;
            if (item) {
                childItem = new QTreeWidgetItem(item);
            } else {
                childItem = new QTreeWidgetItem(treeWidget);
            }
            childItem->setData(0, Qt::UserRole, tagName);
            return childItem;
        }