Qt 5.11 | Qt XML | SAX Bookmarks Example | mainwindow.cpp Example File

Qt 5.11.3 Reference Documentation

# mainwindow.cpp Example File

saxbookmarks/mainwindow.cpp

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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);
      }