qt5base-lts/examples/widgets/dialogs/sipdialog/dialog.cpp

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#include <QtWidgets>

#include "dialog.h"

//! [Dialog constructor part1]
Dialog::Dialog()
{
    desktopGeometry = QApplication::desktop()->availableGeometry(0);

    setWindowTitle(tr("SIP Dialog Example"));
    QScrollArea *scrollArea = new QScrollArea(this);
    QGroupBox *groupBox = new QGroupBox(scrollArea);
    groupBox->setTitle(tr("SIP Dialog Example"));
    QGridLayout *gridLayout = new QGridLayout(groupBox);
    groupBox->setLayout(gridLayout);
//! [Dialog constructor part1]

//! [Dialog constructor part2]
    QLineEdit* lineEdit = new QLineEdit(groupBox);
    lineEdit->setText(tr("Open and close the SIP"));
    lineEdit->setMinimumWidth(220);

    QLabel* label = new QLabel(groupBox);
    label->setText(tr("This dialog resizes if the SIP is opened"));
    label->setMinimumWidth(220);

    QPushButton* button = new QPushButton(groupBox);
    button->setText(tr("Close Dialog"));
    button->setMinimumWidth(220);
//! [Dialog constructor part2]

//! [Dialog constructor part3]
    if (desktopGeometry.height() < 400)
        gridLayout->setVerticalSpacing(80);
    else
        gridLayout->setVerticalSpacing(150);

    gridLayout->addWidget(label);
    gridLayout->addWidget(lineEdit);
    gridLayout->addWidget(button);
//! [Dialog constructor part3]

//! [Dialog constructor part4]
    scrollArea->setWidget(groupBox);
    QHBoxLayout* layout = new QHBoxLayout();
    layout->addWidget(scrollArea);
    setLayout(layout);
    scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
//! [Dialog constructor part4]

//! [Dialog constructor part5]
    connect(button, &QAbstractButton::clicked, qApp, &QApplication::closeAllWindows);
    connect(QApplication::desktop(), &QDesktopWidget::workAreaResized,
        this, &Dialog::desktopResized);
}
//! [Dialog constructor part5]

//! [desktopResized() function]
void Dialog::desktopResized(int screen)
{
    if (screen != 0)
        return;
    reactToSIP();
}
//! [desktopResized() function]

//! [reactToSIP() function]
void Dialog::reactToSIP()
{
    QRect availableGeometry = QApplication::desktop()->availableGeometry(0);

    if (desktopGeometry != availableGeometry) {
        if (windowState() | Qt::WindowMaximized)
            setWindowState(windowState() & ~Qt::WindowMaximized);

        setGeometry(availableGeometry);
    }

    desktopGeometry = availableGeometry;
}
//! [reactToSIP() function]