Center and Resize MainWindow

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The following method computes the final size of the window setting it so it covers the 90% of the whole screen available space, and then centers it (left-to-right flow):

void MainWindow::centerAndResize() {
    // get the dimension available on this screen
    QSize availableSize = qApp->desktop()->availableGeometry().size();
    int width = availableSize.width();
    int height = availableSize.height();
    qDebug() << "Available dimensions " << width << "x" << height;
    width *= 0.9; // 90% of the screen size
    height *= 0.9; // 90% of the screen size
    qDebug() << "Computed dimensions " << width << "x" << height;
    QSize newSize( width, height );

    setGeometry(
        QStyle::alignedRect( 
            Qt::LeftToRight,
            Qt::AlignCenter,
            newSize,
            qApp->desktop()->availableGeometry()
        )
    );
}