QDialog setModal()

Hi All,

How can I make a dialog modal dynamically ?

My application has one working thread , I just want to make my dialog Modal(e.g. setModal(true)) till that thread is done with all the calculations.There I have one API (scriptInExecution()) which returns true if calculation is in progress.

I tried this using setModal(true) but it's not working ,than I used QApplication::processEvent() but still I got nothing.

Code:

---

if(true == scriptInExecution())
 {
    this->setModal(true); 
 }
 else
 {
    this->setModal(false); 
 }

---

Am I missing something :confused:

Thanks.