mainwindow.cpp Example File

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 #include <QtWidgets>

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

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

     createMenus();

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

     setWindowTitle(tr("DOM Bookmarks"));
     const QSize availableSize = QApplication::desktop()->availableGeometry(this).size();
     resize(availableSize.width() / 2, availableSize.height() / 3);
 }

 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(QDir::toNativeSeparators(fileName),
                                   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(QDir::toNativeSeparators(fileName),
                                   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::createMenus()
 {
     QMenu *fileMenu = menuBar()->addMenu(tr("&File"));
     QAction *openAct = fileMenu->addAction(tr("&Open..."), this, &MainWindow::open);
     openAct->setShortcuts(QKeySequence::Open);

     QAction *saveAsAct = fileMenu->addAction(tr("&Save As..."), this, &MainWindow::saveAs);
     saveAsAct->setShortcuts(QKeySequence::SaveAs);

     QAction *exitAct = fileMenu->addAction(tr("E&xit"), this, &QWidget::close);
     exitAct->setShortcuts(QKeySequence::Quit);

     menuBar()->addSeparator();

     QMenu *helpMenu = menuBar()->addMenu(tr("&Help"));
     helpMenu->addAction(tr("&About"), this, &MainWindow::about);
     helpMenu->addAction(tr("About &Qt"), qApp, &QCoreApplication::quit);
 }