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# mainwindow.cpp Example File
itemviews/simpledommodel/mainwindow.cpp

        /****************************************************************************
        **
        ** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
        ** License version 2.0 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 GNU
        ** General Public Licensing requirements will be met:
        ** http://www.trolltech.com/products/qt/opensource.html
        **
        ** If you are unsure which license is appropriate for your use, please
        ** review the following information:
        ** http://www.trolltech.com/products/qt/licensing.html or contact the
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        **
        ** 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 <QDomDocument>
        #include <QFile>
        #include <QtGui>

        #include "dommodel.h"
        #include "mainwindow.h"

        MainWindow::MainWindow() : QMainWindow(), model(0)
        {
            fileMenu = menuBar()->addMenu(tr("&File"));
            fileMenu->addAction(tr("&Open..."), this, SLOT(openFile()),
                                QKeySequence(tr("Ctrl+O")));
            fileMenu->addAction(tr("E&xit"), this, SLOT(close()),
                                QKeySequence(tr("Ctrl+Q")));

            model = new DomModel(QDomDocument(), this);
            view = new QTreeView(this);
            view->setModel(model);

            setCentralWidget(view);
            setWindowTitle(tr("Simple DOM Model"));
        }

        void MainWindow::openFile()
        {
            QString filePath = QFileDialog::getOpenFileName(this, tr("Open File"),
                xmlPath, tr("XML files (*.xml);;HTML files (*.html);;"
                            "SVG files (*.svg);;User Interface files (*.ui)"));

            if (!filePath.isEmpty()) {
                QFile file(filePath);
                if (file.open(QIODevice::ReadOnly)) {
                    QDomDocument document;
                    if (document.setContent(&file)) {
                        DomModel *newModel = new DomModel(document, this);
                        view->setModel(newModel);
                        delete model;
                        model = newModel;
                        xmlPath = filePath;
                    }
                    file.close();
                }
            }
        }