QT 事件拖动窗口

//上面缺号头文件，自行添加哦 class DragtidgetFilter :public Qobject{
public:DragWidgetFilter(QObject* parent) :Q0bject(parent){}　　//重写事件bool eventFilter(Qobject* object,QEvent* event){　　　　auto n= dynanic_cast<QWidget*>( object);if(!w) return false;if(event→type()==QEvent::MouseButtonPress){auto ev= dynamic_cast<QMouseEvent*>(event);if(!ev) return false;pos=ev→pos();}else if(event→type()==QEvent::MouseMove)　　　　{auto ev= dynamic_cast<QMouseEvent*>(event);if(!ev)return false;if(ev→buttons()&Qt::MouseButton::LeftButton) w→move(ev→globalPosition().toPoint()-pos);}}　　return qobject::eventFilter(object, event);}
private:QPoint pos;
};