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

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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();
             }
         }
     }