#include <QtWidgets>

class Widget:public QLineEdit
{
public:
    Widget(const QString &t){
        this->setText(t);
    }
protected:
    void mouseDoubleClickEvent(QMouseEvent *){
        this->dumpObjectTree();
    }
};


int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w("Right clicked on me several times, Then double clicked me");
    w.show();
    return a.exec();
}

#include <QtWidgets>

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

    QMessageBox msgBox;
    msgBox.setDetailedText("Right clicked on Me several times, then close me ... ");
    msgBox.exec();
    msgBox.dumpObjectTree();

    return a.exec();
}