Are there signals for the drop list button on a QComboBox. I'm using a QTableView with an editor delegate for a column. The delegate is a QComboBox and I'd like it to showPopup() when the QComboBox is first shown. I'd also like to detect the drop list being closed so that I can call closeEditor(). I have several parts of the necessary functionality working in crude ways but I'd like something more direct. For example:

* I can cause the list to drop when the QComboBox is displayed if I sub-class QComboBox and start a c. 200ms timer in showEvent() then have timerEvent() call showPopup() and kill the timer.
* I can call closeEditor() on activate and index change signals

I can't yet detect that the drop list is closed via the button. I'd also like a better way than the timer for getting the drop list to appear when the QComboBox is shown.

I searched the forum for QComboBox related threads and didn't find what I am looking for. I'd appreciate any ideas.