mainwindow.cpp Example File | Qt XML 5.6

Qt 5.6 | Qt XML | SAX Bookmarks Example | mainwindow.cpp Example File

Qt 5.6.2 Reference Documentation

# mainwindow.cpp Example File

saxbookmarks/mainwindow.cpp

      /****************************************************************************
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      ** This file is part of the examples of the Qt Toolkit.
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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);
      }