stdin

stdin

bool QWidget::restoreGeometry(const QByteArray &geometry)
{
    if (geometry.size() < 4)
        return false;
    QDataStream stream(geometry);
    stream.setVersion(QDataStream::Qt_4_0);

    const quint32 magicNumber = 0x1D9D0CB;
    quint32 storedMagicNumber;
    stream >> storedMagicNumber;
    if (storedMagicNumber != magicNumber)
        return false;

    const quint16 currentMajorVersion = 2;
    quint16 majorVersion = 0;
    quint16 minorVersion = 0;

    stream >> majorVersion >> minorVersion;

    if (majorVersion > currentMajorVersion)
        return false;
    // (Allow all minor versions.)

    QRect restoredFrameGeometry;
     QRect restoredNormalGeometry;
    qint32 restoredScreenNumber;
    quint8 maximized;
    quint8 fullScreen;
    qint32 restoredScreenWidth = 0;

    stream >> restoredFrameGeometry
           >> restoredNormalGeometry
           >> restoredScreenNumber
           >> maximized
           >> fullScreen;

    if (majorVersion > 1)
        stream >> restoredScreenWidth;

    const QDesktopWidget * const desktop = QApplication::desktop();
    if (restoredScreenNumber >= desktop->numScreens())
        restoredScreenNumber = desktop->primaryScreen();
    const qreal screenWidthF = qreal(desktop->screenGeometry(restoredScreenNumber).width());
    // Sanity check bailing out when large variations of screen sizes occur due to
    // high DPI scaling or different levels of DPI awareness.
    if (restoredScreenWidth) {
        const qreal factor = qreal(restoredScreenWidth) / screenWidthF;
        if (factor < 0.8 || factor > 1.25)
            return false;
    } else {
        // Saved by Qt 5.3 and earlier, try to prevent too large windows
        // unless the size will be adapted by maximized or fullscreen.
        if (!maximized && !fullScreen && qreal(restoredFrameGeometry.width()) / screenWidthF > 1.5)
            return false;
    }

    const int frameHeight = 20;
    if (!restoredFrameGeometry.isValid())
        restoredFrameGeometry = QRect(QPoint(0,0), sizeHint());

    if (!restoredNormalGeometry.isValid())
        restoredNormalGeometry = QRect(QPoint(0, frameHeight), sizeHint());
    if (!restoredNormalGeometry.isValid()) {
        // use the widget's adjustedSize if the sizeHint() doesn't help
        restoredNormalGeometry.setSize(restoredNormalGeometry
                                       .size()
                                       .expandedTo(d_func()->adjustedSize()));
    }

    const QRect availableGeometry = desktop->availableGeometry(restoredScreenNumber);

    // Modify the restored geometry if we are about to restore to coordinates
    // that would make the window "lost". This happens if:
    // - The restored geometry is completely oustside the available geometry
    // - The title bar is outside the available geometry.
    // - (Mac only) The window is higher than the available geometry. It must
    //   be possible to bring the size grip on screen by moving the window.
#ifdef Q_DEAD_CODE_FROM_QT4_MAC
    restoredFrameGeometry.setHeight(qMin(restoredFrameGeometry.height(), availableGeometry.height()));
    restoredNormalGeometry.setHeight(qMin(restoredNormalGeometry.height(), availableGeometry.height() - frameHeight));
#endif

    if (!restoredFrameGeometry.intersects(availableGeometry)) {
        restoredFrameGeometry.moveBottom(qMin(restoredFrameGeometry.bottom(), availableGeometry.bottom()));
        restoredFrameGeometry.moveLeft(qMax(restoredFrameGeometry.left(), availableGeometry.left()));
        restoredFrameGeometry.moveRight(qMin(restoredFrameGeometry.right(), availableGeometry.right()));
    }
    restoredFrameGeometry.moveTop(qMax(restoredFrameGeometry.top(), availableGeometry.top()));

    if (!restoredNormalGeometry.intersects(availableGeometry)) {
        restoredNormalGeometry.moveBottom(qMin(restoredNormalGeometry.bottom(), availableGeometry.bottom()));
        restoredNormalGeometry.moveLeft(qMax(restoredNormalGeometry.left(), availableGeometry.left()));
        restoredNormalGeometry.moveRight(qMin(restoredNormalGeometry.right(), availableGeometry.right()));
    }
    restoredNormalGeometry.moveTop(qMax(restoredNormalGeometry.top(), availableGeometry.top() + frameHeight));

    if (maximized || fullScreen) {
        // set geometry before setting the window state to make
        // sure the window is maximized to the right screen.
        Qt::WindowStates ws = windowState();
#ifndef Q_OS_WIN
        setGeometry(restoredNormalGeometry);
#else
        if (ws & Qt::WindowFullScreen) {
            // Full screen is not a real window state on Windows.
            move(availableGeometry.topLeft());
        } else if (ws & Qt::WindowMaximized) {
            // Setting a geometry on an already maximized window causes this to be
            // restored into a broken, half-maximized state, non-resizable state (QTBUG-4397).
            // Move the window in normal state if needed.
            if (restoredScreenNumber != desktop->screenNumber(this)) {
                setWindowState(Qt::WindowNoState);
                setGeometry(restoredNormalGeometry);
            }
        } else {
            setGeometry(restoredNormalGeometry);
        }
#endif // Q_OS_WIN
        if (maximized)
            ws |= Qt::WindowMaximized;
        if (fullScreen)
            ws |= Qt::WindowFullScreen;
       setWindowState(ws);
       d_func()->topData()->normalGeometry = restoredNormalGeometry;
    } else {
        QPoint offset;
#ifdef Q_DEAD_CODE_FROM_QT4_X11
        if (isFullScreen())
            offset = d_func()->topData()->fullScreenOffset;
#endif
        setWindowState(windowState() & ~(Qt::WindowMaximized | Qt::WindowFullScreen));
        move(restoredFrameGeometry.topLeft() + offset);
        resize(restoredNormalGeometry.size());
    }
    return true;
}