qt-everywhere-src-5.15.1/qtbase/examples/widgets/itemviews/addressbook/mainwindow.cpp

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#include "mainwindow.h"

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

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

//! [1a]
void MainWindow::createMenus()
{
    QMenu *fileMenu = menuBar()->addMenu(tr("&File"));

    QAction *openAct = new QAction(tr("&Open..."), this);
    fileMenu->addAction(openAct);
    connect(openAct, &QAction::triggered, this, &MainWindow::openFile);
//! [1a]

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

    fileMenu->addSeparator();

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

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

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

//! [1b]
    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);
}
//! [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]