python - Kivy Popup or Eventloop Interaction? -

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the first screen of app has small menu (in gridlayout) of 3 buttons. 2 supposed open popups. 1 , 1 about. third 1 changes screen.

only 1 popup works. first 1 called (in kivy file) works, second doesn't open popup. if switch order in cdd.kv, other 1 works.

excerpt cdd.kv:

        cddmainmenulayout:              helpbutton:                 size_hint: .5,.5              metadatabutton:                 size_hint: .5,.5                 on_release: app.root.current = 'metadata'              aboutbutton:                 size_hint: .5,.5

excerpt main.py:

class cddmainmenulayout(gridlayout):     """     provides layout 3 buttons on home screen.     """     def __init__(self, *args, **kwargs):         super(cddmainmenulayout, self).__init__(*args, **kwargs)         self.rows = 1         self.cols = 3         self.size_hint = (.5,.5)

...

class cddbutton(button):     def __init__(self, **kwargs):         super(cddbutton, self).__init__(**kwargs)         self.text = _('button')         self.background_color = colors.grey2  class aboutbutton(cddbutton):     def __init__(self, **kwargs):         super(aboutbutton, self).__init__(**kwargs)         self.text = _("about cdd")         self.background_color = colors.red1         = popup()         a.title = _("about constraint definition designer, version - " + __version__)         a.content = rstdocument(source='about.rst')         a.size_hint_x = .8         a.size_hint_y = .8         self.bind(on_release=a.open)  class helpbutton(cddbutton):     def __init__(self, **kwargs):         super(helpbutton, self).__init__(**kwargs)         self.text = _("help")         self.background_color = colors.green1         h = popup()         h.title = _("cdd help")         h.content = rstdocument(source='help.rst')         h.size_hint_x = .8         h.size_hint_y = .8         self.bind(on_release=h.open)

does change if add lines self.popup = h , self.popup = a? 1 possibility popups being garbage collected since don't store references them. i'm not sure if/how give particular behaviour, it's worth try.


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