如何在Qt中维护小部件的宽高比？

widget->setFixedSize(width, height);

widget->setGeometry(x, y, width, height);

void Widget::resizeEvent(QResizeEvent *event)
{
    QWidget::resizeEvent(event);
    int width = event->size().width();
    int height = event->size().height();
    // 计算新的宽高比
    double ratio = static_cast<double>(width) / height;
    // 调整小部件大小
    widget->setFixedSize(width, height);
}

QHBoxLayout *layout = new QHBoxLayout;
layout->addWidget(widget);
setLayout(layout);
widget->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);