How to get coordinates of QToolBar icons in PyQt4 application?

I'd like to know how to set position of QCalendarWidget just below the button of ToolBar.

Currently, when user clicks a icon button inside red box,

then the below Calendar() instance is created and the instance is shown in the middle of screen.

What I want to implement is like the following.

You can refer full source code from here.

Any suggestion or advice will be appreciated.

Solution

This functionality is already provided by QDateTimeEdit, so you don't need a separate button for it:

    def init_toolbar(self):
        ...
        dtedit = QtGui.QDateTimeEdit()
        dtedit.setCalendarPopup(True)