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先说一下整体思路。页面布局两个widget然后再将定时器和按钮关联起来。

定时器发出信号的时候，随着信号，不断地重新设置widget的宽度，实现窗口的动态切换。

具体操作如下：

class QtWidgetsApplication4 : public QMainWindow
{Q_OBJECT//切换的状态标志位enum class MoveActive{START,MOVING,FINISH};
public:QtWidgetsApplication4(QWidget *parent = Q_NULLPTR);//决定是否显示右边的widgetvoid showWidget(bool isShow);private:Ui::QtWidgetsApplication4Class ui;MoveActive m_status;bool showOrNot;QTimer * m_pTimer = nullptr;
};

具体函数实现如下

void QtWidgetsApplication4::showWidget(bool isShow)
{showOrNot = isShow;m_status = MoveActive::START;m_pTimer->start(30);
}

//首先设置一下窗口的尺寸int width = this->width();this->setFixedWidth(180);//初始状态只显示左边ui.widget_2->setFixedWidth(0);ui.widget_2->setVisible(false);ui.widget->setFixedWidth(195);ui.widget->setVisible(true);connect(ui.pushButton, &QPushButton::clicked, [&] {showWidget(true);});connect(ui.pushButton_2, &QPushButton::clicked, [&] {showWidget(false);});m_pTimer = new QTimer(this);connect(m_pTimer, &QTimer::timeout, [&] {switch (m_status){case QtWidgetsApplication4::MoveActive::START:ui.widget->setVisible(true);ui.widget_2->setVisible(true);m_status = MoveActive::MOVING;break;case QtWidgetsApplication4::MoveActive::MOVING:if (showOrNot){int leftWidth = ui.widget->width();leftWidth -= 10;int rightWidth = ui.widget_2->width();rightWidth += 10;if (rightWidth >= 175|| leftWidth <= 10){rightWidth = 175;leftWidth = 0;ui.widget->setFixedWidth(0);ui.widget_2->setFixedWidth(175);m_status = MoveActive::FINISH;break;}ui.widget->setFixedWidth(leftWidth);ui.widget_2->setFixedWidth(rightWidth);}else {//左侧变宽，右侧变窄int leftWidth = ui.widget->width();int rightWidth = ui.widget_2->width();leftWidth += 10;rightWidth -= 10;if (leftWidth>=175|| rightWidth <= 10){leftWidth = 175;rightWidth = 0;ui.widget->setFixedWidth(175);ui.widget_2->setFixedWidth(0);m_status = MoveActive::FINISH;break;}ui.widget->setFixedWidth(leftWidth);ui.widget_2->setFixedWidth(rightWidth);}break;case QtWidgetsApplication4::MoveActive::FINISH:m_pTimer->stop();break;default:break;}});