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# mainwindow.cpp Example File
xml/dombookmarks/mainwindow.cpp

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     ** This file is part of the documentation of the Qt Toolkit.
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     #include <QtGui>

     #include "mainwindow.h"
     #include "xbeltree.h"

     MainWindow::MainWindow()
     {
         xbelTree = new XbelTree;
         setCentralWidget(xbelTree);

         createActions();
         createMenus();

         statusBar()->showMessage(tr("Ready"));

         setWindowTitle(tr("DOM Bookmarks"));
         resize(480, 320);
     }

     void MainWindow::open()
     {
         QString fileName =
                 QFileDialog::getOpenFileName(this, tr("Open Bookmark File"),
                                              QDir::currentPath(),
                                              tr("XBEL Files (*.xbel *.xml)"));
         if (fileName.isEmpty())
             return;

         QFile file(fileName);
         if (!file.open(QFile::ReadOnly | QFile::Text)) {
             QMessageBox::warning(this, tr("SAX Bookmarks"),
                                  tr("Cannot read file %1:\n%2.")
                                  .arg(fileName)
                                  .arg(file.errorString()));
             return;
         }

         if (xbelTree->read(&file))
             statusBar()->showMessage(tr("File loaded"), 2000);
     }

     void MainWindow::saveAs()
     {
         QString fileName =
                 QFileDialog::getSaveFileName(this, tr("Save Bookmark File"),
                                              QDir::currentPath(),
                                              tr("XBEL Files (*.xbel *.xml)"));
         if (fileName.isEmpty())
             return;

         QFile file(fileName);
         if (!file.open(QFile::WriteOnly | QFile::Text)) {
             QMessageBox::warning(this, tr("SAX Bookmarks"),
                                  tr("Cannot write file %1:\n%2.")
                                  .arg(fileName)
                                  .arg(file.errorString()));
             return;
         }

         if (xbelTree->write(&file))
             statusBar()->showMessage(tr("File saved"), 2000);
     }

     void MainWindow::about()
     {
        QMessageBox::about(this, tr("About DOM Bookmarks"),
                           tr("The <b>DOM Bookmarks</b> example demonstrates how to "
                              "use Qt's DOM classes to read and write XML "
                              "documents."));
     }

     void MainWindow::createActions()
     {
         openAct = new QAction(tr("&Open..."), this);
         openAct->setShortcut(tr("Ctrl+O"));
         connect(openAct, SIGNAL(triggered()), this, SLOT(open()));

         saveAsAct = new QAction(tr("&Save As..."), this);
         saveAsAct->setShortcut(tr("Ctrl+S"));
         connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));

         exitAct = new QAction(tr("E&xit"), this);
         exitAct->setShortcut(tr("Ctrl+Q"));
         connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));

         aboutAct = new QAction(tr("&About"), this);
         connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));

         aboutQtAct = new QAction(tr("About &Qt"), this);
         connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
     }

     void MainWindow::createMenus()
     {
         fileMenu = menuBar()->addMenu(tr("&File"));
         fileMenu->addAction(openAct);
         fileMenu->addAction(saveAsAct);
         fileMenu->addAction(exitAct);

         menuBar()->addSeparator();

         helpMenu = menuBar()->addMenu(tr("&Help"));
         helpMenu->addAction(aboutAct);
         helpMenu->addAction(aboutQtAct);
     }