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);
      setCentralWidget(treeWidget);

      createActions();
      createMenus();

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

      setWindowTitle(tr("SAX 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;

      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(fileName)
                               .arg(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(fileName)
                               .arg(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::createActions()
  {
      openAct = new QAction(tr("&Open..."), this);
      openAct->setShortcuts(QKeySequence::Open);
      connect(openAct, SIGNAL(triggered()), this, SLOT(open()));

      saveAsAct = new QAction(tr("&Save As..."), this);
      saveAsAct->setShortcuts(QKeySequence::SaveAs);
      connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));

      exitAct = new QAction(tr("E&xit"), this);
      exitAct->setShortcuts(QKeySequence::Quit);
      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);
  }