Modifying ui elements of one dialog from another dialog.

[toufic.dbouk]

You don't need sendText(), you can just connect to the QLIneEdit's textChanged(QString) signal.

yea we went over this , was just making it clearer by emitting his own signal.
in the header file just add :

signals: 
void sendText(QString);

signals: 
void sendText(QString);

To copy to clipboard, switch view to plain text mode 

and in the .cpp file in the method where you need to emit the signal add:

emit sendText(/*your string */);

emit sendText(/*your string */);

To copy to clipboard, switch view to plain text mode