mainwindow.cpp Example File

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  #include <QtWidgets>

  #include "mainwindow.h"
  #include "xbelgenerator.h"
  #include "xbelhandler.h"

  MainWindow::MainWindow()
  {
      QStringList labels;
      labels << tr("Title") << tr("Location");

      treeWidget = new QTreeWidget;
      treeWidget->header()->setSectionResizeMode(QHeaderView::Stretch);
      treeWidget->setHeaderLabels(labels);
  #if !defined(QT_NO_CONTEXTMENU) && !defined(QT_NO_CLIPBOARD)
      treeWidget->setContextMenuPolicy(Qt::CustomContextMenu);
      connect(treeWidget, &QWidget::customContextMenuRequested,
              this, &MainWindow::onCustomContextMenuRequested);
  #endif
      setCentralWidget(treeWidget);

      createMenus();

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

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

  #if !defined(QT_NO_CONTEXTMENU) && !defined(QT_NO_CLIPBOARD)
  void MainWindow::onCustomContextMenuRequested(const QPoint &pos)
  {
      const QTreeWidgetItem *item = treeWidget->itemAt(pos);
      if (!item)
          return;
      const QString url = item->text(1);
      QMenu contextMenu;
      QAction *copyAction = contextMenu.addAction(tr("Copy Link to Clipboard"));
      QAction *openAction = contextMenu.addAction(tr("Open"));
      QAction *action = contextMenu.exec(treeWidget->viewport()->mapToGlobal(pos));
      if (action == copyAction)
          QGuiApplication::clipboard()->setText(url);
      else if (action == openAction)
          QDesktopServices::openUrl(QUrl(url));
  }
  #endif // !QT_NO_CONTEXTMENU && !QT_NO_CLIPBOARD

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

      treeWidget->clear();

      XbelHandler handler(treeWidget);
      QXmlSimpleReader reader;
      reader.setContentHandler(&handler);
      reader.setErrorHandler(&handler);

      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;
      }

      QXmlInputSource xmlInputSource(&file);
      if (reader.parse(xmlInputSource))
          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;
      }

      XbelGenerator generator(treeWidget);
      if (generator.write(&file))
          statusBar()->showMessage(tr("File saved"), 2000);
  }

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

  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);
  }