I'm creating a plugin and I want to catch when the tab is changed.

I'd like share with you how to reach that. Maybe It could be useful in your applications.

Steps:

1- Create a custom TabBook class

2- Define a function Map to catch the event with message ID = FXTabBook.ID_OPEN_ITEM

3- Define a function to handle the event.

The code would be like:

class cTabBook(FXTabBook):
        def __init__(self, owner, *arg, **kw):
                FXTabBook.__init__(self, *arg, **kw)

                self.owner = owner

               # Function Maps
               #
               FXMAPFUNC(self, SEL_COMMAND, FXTabBook.ID_OPEN_ITEM, cTabBook.onCmdChangeTab)

 
       #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
       def onCmdChangeTab(self, sender, sel, ptr):
               if(sender.getText() == HOLLOMON):
                       self.setCurrent(ZERO)
               elif(sender.getText() == LUDWIK):
                       self.setCurrent(ONE)
               elif(sender.getText() == SWIFT_KRUPKOWSKI):
                       self.setCurrent(TWO)

               # Call to owner function to do something
               #

               self.owner.setNoteMessage()

I hope you find it useful