qt5base-lts/examples/itemviews/addressbook/mainwindow.cpp

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#include <QtWidgets>
#include "mainwindow.h"

//! [0]
MainWindow::MainWindow()
{
    addressWidget = new AddressWidget;
    setCentralWidget(addressWidget);
    createMenus();
    setWindowTitle(tr("Address Book"));
}
//! [0]

//! [1a]
void MainWindow::createMenus()
{
    fileMenu = menuBar()->addMenu(tr("&File"));
    
    openAct = new QAction(tr("&Open..."), this);
    fileMenu->addAction(openAct);
    connect(openAct, SIGNAL(triggered()),
        this, SLOT(openFile()));
//! [1a]

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

    fileMenu->addSeparator();

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

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

    addAct = new QAction(tr("&Add Entry..."), this);
    toolMenu->addAction(addAct);
    connect(addAct, SIGNAL(triggered()),
        addressWidget, SLOT(addEntry()));
    
//! [1b]
    editAct = new QAction(tr("&Edit Entry..."), this);
    editAct->setEnabled(false);
    toolMenu->addAction(editAct);
    connect(editAct, SIGNAL(triggered()),
        addressWidget, SLOT(editEntry()));

    toolMenu->addSeparator();

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

    connect(addressWidget, SIGNAL(selectionChanged(QItemSelection)),
        this, SLOT(updateActions(QItemSelection)));
}
//! [1b]

//! [2]
void MainWindow::openFile()
{
    QString fileName = QFileDialog::getOpenFileName(this);
    if (!fileName.isEmpty()) {
        addressWidget->readFromFile(fileName);
    }
}
//! [2]

//! [3]
void MainWindow::saveFile()
{
    QString fileName = QFileDialog::getSaveFileName(this);
    if (!fileName.isEmpty()) {
        addressWidget->writeToFile(fileName);
    }
}
//! [3]

//! [4]
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);
    }
}
//! [4]