Question

I am trying to bind events from a GUI file to use code from another file (effectively a “front end” and a “back end”). I can get the back end and front end working within the same file, but when I try to move them into separate files, I have issues getting the back end to see parts (labels, buttons, etc.) of the front end.

I. E. I need the back end code to change labels and do math and such, and it would need to affect the GUI.

I have provided a simple version of my program. Everything works with the exception of the error I get when I try to make the back end see the parts of the GUI.

mainfile.py

#!/usr/bin/python
# -*- coding: utf-8 -*-

import wx

import label_changer

class foopanel(wx.Panel):
    def __init__(self, parent):
        wx.Panel.__init__(self, parent, id=wx.ID_ANY)

        box = wx.BoxSizer()
        btn = wx.Button(self,1,"Press")
        btn.Bind(wx.EVT_BUTTON,label_changer.change_label(self))
        box.Add(btn)

        self.lbl = wx.StaticText(self,1,"Foobar")
        box.Add(self.lbl)

        self.SetSizerAndFit(box)

class main_frame(wx.Frame):
    """Main Frame holding the main panel."""
    def __init__(self,*args,**kwargs):
        wx.Frame.__init__(self,*args,**kwargs)

        sizer = wx.BoxSizer()

        self.p = foopanel(self)

        sizer.Add(self.p,1)

        self.Show()

if __name__ == "__main__":
    app = wx.App(False)
    frame = main_frame(None,-1,)
    app.MainLoop()

label_changer.py

def change_label(self):
    self.p.lbl.SetLabel("barfoo")

All I want it to do is change the label of the GUI, but use an external file.

I am doing this mostly to keep my code separate and just as a learning experience.

Thanks in advance!

Answer 1

A common way to do this is the MVC Pattern and pubsub. See this Example.