Qt GroupBox使用窗口更改项目宽度

#include <QtWidgets>

class MyWindow : public QWidget {
public:
    MyWindow(QWidget *parent = nullptr) : QWidget(parent) {
        QVBoxLayout *layout = new QVBoxLayout;
        setLayout(layout);

        QGroupBox *groupBox = new QGroupBox("Group Box");
        layout->addWidget(groupBox);

        QHBoxLayout *groupBoxLayout = new QHBoxLayout;
        groupBox->setLayout(groupBoxLayout);

        QPushButton *button1 = new QPushButton("Button 1");
        QPushButton *button2 = new QPushButton("Button 2");
        QLineEdit *lineEdit = new QLineEdit;

        groupBoxLayout->addWidget(button1);
        groupBoxLayout->addWidget(button2);
        groupBoxLayout->addWidget(lineEdit);
    }

protected:
    void resizeEvent(QResizeEvent *event) override {
        QWidget::resizeEvent(event);

        QGroupBox *groupBox = findChild<QGroupBox *>("Group Box");
        if (groupBox) {
            int newWidth = event->size().width();
            int itemWidth = newWidth / 3; // 平均分配宽度给每个项目

            foreach (QObject *child, groupBox->children()) {
                QWidget *widget = qobject_cast<QWidget *>(child);
                if (widget) {
                    widget->setFixedWidth(itemWidth);
                }
            }
        }
    }
};

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);

    MyWindow window;
    window.show();

    return app.exec();
}