Upgrading from 1.11.1 to 2.1 breaks on ids

[zensku...@gmail.com]

Hi, I've got a pure python program and a .kv file. Just upgraded from 1.11.1 to 2.1 and it crashes when starting, throwing this exception:

####################

 Traceback (most recent call last):
   File "kivy\_event.pyx", line 235, in kivy._event.EventDispatcher.__init__
 TypeError: object.__init__() takes exactly one argument (the instance to initialize)

 The above exception was the direct cause of the following exception:

 Traceback (most recent call last):
   File "G:\GammaDev\src\gammaui.py", line 2366, in <module>
     GAMMAUIApp().run()
   File "C:\Users\Tyler\AppData\Roaming\Python\Python39\site-packages\kivy\app.py", line 954, in run
     self._run_prepare()
   File "C:\Users\Tyler\AppData\Roaming\Python\Python39\site-packages\kivy\app.py", line 924, in _run_prepare
     root = self.build()
   File "G:\GammaDev\src\gammaui.py", line 2359, in build
     main_screen = MainForm(name='main', id="main")
   File "G:\GammaDev\src\gammaui.py", line 85, in __init__
     super (MainForm, self).__init__(**kwargs)
   File "C:\Users\Tyler\AppData\Roaming\Python\Python39\site-packages\kivy\uix\relativelayout.py", line 274, in __init__
     super(RelativeLayout, self).__init__(**kw)
   File "C:\Users\Tyler\AppData\Roaming\Python\Python39\site-packages\kivy\uix\floatlayout.py", line 65, in __init__
     super(FloatLayout, self).__init__(**kwargs)
   File "C:\Users\Tyler\AppData\Roaming\Python\Python39\site-packages\kivy\uix\layout.py", line 76, in __init__
     super(Layout, self).__init__(**kwargs)
   File "C:\Users\Tyler\AppData\Roaming\Python\Python39\site-packages\kivy\uix\widget.py", line 357, in __init__
     super(Widget, self).__init__(**kwargs)
   File "kivy\_event.pyx", line 238, in kivy._event.EventDispatcher.__init__
 TypeError: Properties ['id'] passed to __init__ may not be existing property names. Valid properties are ['center', 'center_x', 'center_y', 'children', 'cls', 'disabled', 'height', 'ids', 'manager', 'motion_filter', 'name', 'opacity', 'parent', 'pos', 'pos_hint', 'right', 'size', 'size_hint', 'size_hint_max', 'size_hint_max_x', 'size_hint_max_y', 'size_hint_min', 'size_hint_min_x', 'size_hint_min_y', 'size_hint_x', 'size_hint_y', 'top', 'transition_progress', 'transition_state', 'width', 'x', 'y']

####################

kv file looks like this

                Label:
                    id: visualization_label
                    pos: 50, root.height - 42
                    text_size: self.size
                    size_hint: None, None
                    size: 300, 22
                    markup: True
                    text: '[b]Visualization Options[/b]'
                    font_size: 20
                    halign: 'left'
                    orientation: 'horizontal'

My python is setup like this:

class MainForm(Screen):
    def __init__(self, **kwargs):
        super (MainForm, self).__init__(**kwargs)
        self.add_widget(MainScreen())

class MainScreen(Widget):
    def __init__(self, **kwargs):
        super (MainScreen, self).__init__(**kwargs)
        Window.size = (1100, 800)

        Clock.schedule_once(self._my_func1)
        Clock.schedule_once( self._my_func2 )

I read in the changelog that widget id's are no longer supported. Is that really the case and if so, how can I reference that label from code?

Thanks for any help!

Tyler

[Elliot Garbus]

You can reference a label from your code as you did through the ids dict.

Look to make sure in python you are not expecting that an id property was associated with a widget.

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[zensku...@gmail.com]

If the widgets don't have id's, how can I reference them in code? For instance:
                Label:

                    pos: 50, root.height - 42
                    text_size: self.size
                    size_hint: None, None
                    size: 300, 22
                    markup: True
                    text: '[b]Visualization Options[/b]'
                    font_size: 20
                    halign: 'left'
                    orientation: 'horizontal'

How can I reference that in the ids dict, from code?

[Elliot Garbus]

The id is a kv construct, not a widget property.  See: https://kivy.org/doc/stable/api-kivy.lang.html?highlight=lang#ids

You put an id in kv, and when the kv is processed it creates an ids dictionary.

 

So you can do:

 

BoxLayout:

    Label:

        id: label_1

 

and access with widget in python using ids

 

You can not do:

Label(text=’Hello’, id=’WTF’)

To view this discussion on the web visit https://groups.google.com/d/msgid/kivy-users/c2c40f74-9bab-4d6e-8742-a5375ce66ec5n%40googlegroups.com.

 

[Elliot Garbus]

Also see: https://kivy.org/doc/stable-1.11.1/api-kivy.uix.widget.html?highlight=ids#kivy.uix.widget.Widget.id

Notice the deprecation message.

 

From: Elliot Garbus
Sent: Tuesday, April 5, 2022 6:07 AM
To: kivy-...@googlegroups.com
Subject: RE: [kivy-users] Upgrading from 1.11.1 to 2.1 breaks on ids

 

The id is a kv construct, not a widget property.  See: https://kivy.org/doc/stable/api-kivy.lang.html?highlight=lang#ids

You put an id in kv, and when the kv is processed it creates an ids dictionary.

 

So you can do:

 

BoxLayout:

    Label:

        id: label_1

 

and access with widget in python using ids

 

You can not do:

Label(text=’Hello’, id=’WTF’)

 

 

From: zensku...@gmail.com
Sent: Tuesday, April 5, 2022 4:48 AM

To view this discussion on the web visit https://groups.google.com/d/msgid/kivy-users/c2c40f74-9bab-4d6e-8742-a5375ce66ec5n%40googlegroups.com.

 

 

[zensku...@gmail.com]

Got it. Thanks.