promoted widgets using QT designer is not calling its constructor

[Ratheendrans]

Dear All,

I made a subclass of QLineEdit class and implemented its constructor and keyPressEvent event handler,then I promoted one of the instances of QLineEdit to subclass with QT Designer by right clicking and selecting the promote option. I am able to call keyPressEvent() method in my application. however the constructor of this subclass is never called.

header file.

class printlineEdit : public QLineEdit
{
    //Q_OBJECT
 
public:
//signals:
//      void escapePress();
public:
 
    printlineEdit(QWidget *parent = 0);
    void keyPressEvent( QKeyEvent *event );
    unsigned int ValuePut,val;
 
};

class printlineEdit : public QLineEdit
{
    //Q_OBJECT

public:
//signals:
//      void escapePress();
public:

    printlineEdit(QWidget *parent = 0);
    void keyPressEvent( QKeyEvent *event );
    unsigned int ValuePut,val;

};

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its corresponding c++ file.

printlineEdit::printlineEdit(QWidget *parent):QLineEdit(parent)
{
ValuePut=0;
//selectionStart ();
//setCursorPosition(0);
printf("Inside printline constr\n");
}
 
void printlineEdit::keyPressEvent(QKeyEvent *event)
{
    bool flag=0;
    QString ch("");
 
    switch(event->key())
    {
        case Qt::Key_Left:
            break;
        case Qt::Key_Right:
 
            break;
        case Qt::Key_Up:
            break;
        case Qt::Key_Down:
 
           break;
        case Qt::Key_Return:
           flag=1;
           printf("Enter Pressed\n");
           break;
      }
     }
}

printlineEdit::printlineEdit(QWidget *parent):QLineEdit(parent)
{
ValuePut=0;
//selectionStart ();
//setCursorPosition(0);
printf("Inside printline constr\n");
}

void printlineEdit::keyPressEvent(QKeyEvent *event)
{
    bool flag=0;
    QString ch("");

    switch(event->key())
    {
        case Qt::Key_Left:
            break;
        case Qt::Key_Right:

            break;
        case Qt::Key_Up:
            break;
        case Qt::Key_Down:

           break;
        case Qt::Key_Return:
           flag=1;
           printf("Enter Pressed\n");
           break;
      }
     }
}

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Now for the above code the constructor printlineEdit(QWidget *parent) is never called.

Kindly tell me how to implement a constructor in these scenario.

Ratheendran