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该示例演示了一个"扩张的窗口"，主窗口的布局为水平布局，内置两个子窗口，采用定时器设置左边窗口的宽度，达到控制"扩张"的目的。

#include <QApplication>
#include <QWidget>
#include <QHBoxLayout>
#include <QTimer>class MyWidget : public QWidget
{//Q_OBJECT
public:MyWidget(QWidget* parent = nullptr) : QWidget(parent){setFixedSize(600, 400);hLayout = new QHBoxLayout(this);widget1 = new QWidget(this);widget1->setFixedWidth(20);widget1->setStyleSheet("background-color:red;");widget2 = new QWidget(this);hLayout->addWidget(widget1);hLayout->addWidget(widget2, 1);widget2->setStyleSheet("background-color:green;");m_timer = new QTimer(this);m_timer->start();m_timer->setInterval(100);QObject::connect(m_timer, &QTimer::timeout, [=]() {int nW = widget1->width() + 1;if (nW >= 100)return;widget1->setFixedWidth(nW);});}private:QWidget* widget1;QWidget* widget2;QHBoxLayout *hLayout;QTimer* m_timer;
};int main(int argc, char** argv)
{QApplication app(argc, argv);MyWidget w;w.show();return app.exec();
}