figuring out when a widget is focusable?

[Bill Janssen]

I have a TextInput I add to an already existing and visible window, a Popup.  I'd like to make it focused when it appears.  How do I do that?  I've tried:

1.  Add it to the already-visible window with add_widget(), then set the "focus" property to True.

2.  Set up a Clock callback in the TextInput's __init__, like this:

     Clock.schedule_once(self.check_connected)

and then

    def check_connected(self, *args):
        if not self.disabled and self.get_root_window() is not None:
            self.focus = True
        else:
            Clock.schedule_once(self.check_connected)

Neither works.

Bill

[Bill Janssen]

What appears to be happening is that the TextInput does get the focus, and then it's removed again.  Is there some way to track which widget has the focus?

Bill

[Bill Janssen]

What's going on is that I do the add of the TextInput in response to a button press.  That code is bound to the "on_press" event of the button.  However, it seems that any on_touch_up event, after a widget has received focus, will result in de-focussing it.  So the on_touch_up event of the button will defocus the already-focussed TextInput.  If I add the TextInput in response to the "on_release" event of the button, instead, I can just set the "focus" property directly, as in case (1) below.

This is actually sort of documented under the "ignored_touch" property of FocusBehavior (probably should be "ignored_touches").  Basically, any on_touch_up event will defocus the focussed widget unless that touch is in the "ignored_touch" list.

Bill