How to get the text from textedit when mouse is clicked

[Sarma]

sir,

Use clicked(int para, int pos) signal and in the slot call text(int para) which returns the text of the given paragraph.

Isn't that the signal and the slot should have the same no. of parameters and are of same type.
I need to get the text if I "Double click the mouse" and in above statement, the signal is simply clicked(). why it is so?