Accessing kivy widgets in panda3d

Scripting Issues
1

How d I access kivy widget properties within panda3d code.

    from panda3d_kivy.app import App
    from kivy.uix.button import Button
    
    class Example(App):
        def build(self):
            button = Button(text='Hello, world!')
            return button
    
    from direct.showbase.ShowBase import ShowBase
    
    class PandaApp(ShowBase):
        def __init__(self):
            ShowBase.__init__(self)
    
            self.kivy_app = kivy_app = Example(self)
            kivy_app.run()
            
           print(kivy_app.button.text) ##### how to make this work
    
    PandaApp().run()
2

CC’ing @Cheaterman, who may be best positioned to answer this question.

3

Hi,

There are two things :

  1. First you should put your variable “button” as “self.button” to access it from the PandaApp class
  2. At the PandaApp init() time, the button class is probably not built immediately, so you need to wait a little bit (hence the task below) before accessing it

Probably (not tested), if you declare your classes through a kv file, you may not have that situation…

This should work (tested for me):

from panda3d_kivy.app import App
from kivy.uix.button import Button
from kivy.uix.gridlayout import GridLayout

from direct.showbase.ShowBase import ShowBase

class Example(App):
        def build(self):
            self.button = Button(text='Hello, world!')
            return self.button
    

class PandaApp(ShowBase):

   def __init__(self):
        ShowBase.__init__(self)
        self.kivy_app = kivy_app = Example(self)
        self.kivy_app.run()
        self.taskMgr.add(self.check_ui, 'check_ui')

   def check_ui(self,task):
       if hasattr(self.kivy_app,"button"):
           print(self.kivy_app.button.text)
       else:
           print("Nok")
       return task.cont

PandaApp().run()
4

I think Melan did a wonderful job at answering this :slight_smile: just a small detail, I’d probably set “self.button” to “None” inside of the init of your Example class in this case (don’t forget to call super().init(self) !), so that you can simplify your test to “if self.kivy_app.button” instead of using “hasattr()”.

(Also FYI Melan, I saw your issues, just a bit busy at the moment :slight_smile: )

5

@Cheaterman: Excellent! thanks and no worries.

6

Thank you! Yes using a kv file might be a lot easier as then you can access the widgets through their ids. I’ll have to test it out when I get the chance

8

Any idea how to make it work with the RenderPipeline?