mainwindow.cpp Example File | Qt Widgets 5.12.11

- Qt 5.12
- Qt Widgets
- Address Book Example
- mainwindow.cpp Example File
- Qt 5.12.11 Reference Documentation

# mainwindow.cpp Example File

itemviews/addressbook/mainwindow.cpp

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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);
         }
     }