mainwindow.cpp Example File

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  #include "mainwindow.h"

  #include <QAction>
  #include <QFileDialog>
  #include <QMenuBar>

  MainWindow::MainWindow()
  {
      addressWidget = new AddressWidget;
      setCentralWidget(addressWidget);
      createMenus();
      setWindowTitle(tr("Address Book"));
  }

  void MainWindow::createMenus()
  {
      fileMenu = menuBar()->addMenu(tr("&File"));

      openAct = new QAction(tr("&Open..."), this);
      fileMenu->addAction(openAct);
      connect(openAct, &QAction::triggered, this, &MainWindow::openFile);

      saveAct = new QAction(tr("&Save As..."), this);
      fileMenu->addAction(saveAct);
      connect(saveAct, &QAction::triggered, this, &MainWindow::saveFile);

      fileMenu->addSeparator();

      exitAct = new QAction(tr("E&xit"), this);
      fileMenu->addAction(exitAct);
      connect(exitAct, &QAction::triggered, this, &QWidget::close);

      toolMenu = menuBar()->addMenu(tr("&Tools"));

      addAct = new QAction(tr("&Add Entry..."), this);
      toolMenu->addAction(addAct);
      connect(addAct, &QAction::triggered, addressWidget, &AddressWidget::showAddEntryDialog);

      editAct = new QAction(tr("&Edit Entry..."), this);
      editAct->setEnabled(false);
      toolMenu->addAction(editAct);
      connect(editAct, &QAction::triggered, addressWidget, &AddressWidget::editEntry);

      toolMenu->addSeparator();

      removeAct = new QAction(tr("&Remove Entry"), this);
      removeAct->setEnabled(false);
      toolMenu->addAction(removeAct);
      connect(removeAct, &QAction::triggered, addressWidget, &AddressWidget::removeEntry);

      connect(addressWidget, &AddressWidget::selectionChanged,
          this, &MainWindow::updateActions);
  }

  void MainWindow::openFile()
  {
      QString fileName = QFileDialog::getOpenFileName(this);
      if (!fileName.isEmpty())
          addressWidget->readFromFile(fileName);
  }

  void MainWindow::saveFile()
  {
      QString fileName = QFileDialog::getSaveFileName(this);
      if (!fileName.isEmpty())
          addressWidget->writeToFile(fileName);
  }

  void MainWindow::updateActions(const QItemSelection &selection)
  {
      QModelIndexList indexes = selection.indexes();

      if (!indexes.isEmpty()) {
          removeAct->setEnabled(true);
          editAct->setEnabled(true);
      } else {
          removeAct->setEnabled(false);
          editAct->setEnabled(false);
      }
  }