Python 3 Tkinter Frame interaction

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  • Mariostg
    Contributor
    • Sep 2010
    • 332
    #1

    Python 3 Tkinter Frame interaction

    I am trying to have a form talk to another one as per exemple below. Basically, a child form alter a widget on a parent form. I cannot find a way to make this to work. What am I doing wrong or missing? The method I am trying to solve is SetParentValue.
    Code:
    from tkinter import *
from tkinter import ttk

class FirstFrame():
    def __init__(self,root):
        self.root=root
        self.frame=Frame(self.root)
        self.PlaceLeftButton()
        self.PlaceLabel()
        
    def PlaceLeftButton(self):
        self.btn=ttk.Button(self.root,text='Open Child Form',command=self.OpenChild)
        self.btn.grid(column=0,row=0)
    def PlaceLabel(self):
        self.lbl=ttk.Label(self.root, text='At Start')
        self.lbl.grid(column=1,row=0)

    def OpenChild(self):
        top=Toplevel(self.root)
        self.child=ChildFrame(top)

class ChildFrame():
    def  __init__(self, root):
        self.root=root
        self.childframe=Frame(self.root)
        self.PlaceLeftButton()
        self.PlaceEntryField()
    def PlaceLeftButton(self):
        self.btn=Button(self.root,text='Reset parent form', command=self.SetParentValue)
        self.btn.grid(column=0,row=0)
    def PlaceEntryField(self):
        self.entry=Entry(self.root)
        self.entry.grid(column=0, row=1)
    def SetParentValue(self):
        self.root.lbl(text='Parent has been reset')
        
if  __name__=='__main__':
    root = Tk()
    root.option_add('*font', ('verdana', 12, 'bold'))
    root.title("Class Interaction")
    display = FirstFrame(root)
    root.mainloop()
    Tags: None
    • bvdet
      Recognized Expert Specialist
      • Oct 2006
      • 2851
      #2
      You need to pass the instance to ChildFrame() as well as the Toplevel object. Since I am in Python 2.X, I modified the code accordingly. Also, use widget method config() to set the text value.
      Code:
      from Tkinter import *
#from tkinter import *
#from tkinter import ttk
 
class FirstFrame(object):
    def __init__(self,root):
        self.root=root
        self.frame=Frame(self.root)
        self.PlaceLeftButton()
        self.PlaceLabel()
 
    def PlaceLeftButton(self):
        self.btn=Button(self.root,text='Open Child Form',command=self.OpenChild)
        self.btn.grid(column=0,row=0)
    def PlaceLabel(self):
        self.lbl=Label(self.root, text='At Start')
        self.lbl.grid(column=1,row=0)
 
    def OpenChild(self):
        top=Toplevel(self.root)
        self.child=ChildFrame(top, self)
 
class ChildFrame(object):
    def  __init__(self, root, obj):
        self.root=root
        self.obj=obj
        self.childframe=Frame(self.root)
        self.PlaceLeftButton()
        self.PlaceEntryField()
    def PlaceLeftButton(self):
        self.btn=Button(self.root,text='Reset parent form', command=self.SetParentValue)
        self.btn.grid(column=0,row=0)
    def PlaceEntryField(self):
        self.entry=Entry(self.root)
        self.entry.grid(column=0, row=1)
    def SetParentValue(self):
        self.obj.lbl.config(text='Parent has been reset')
 
if  __name__=='__main__':
    root = Tk()
    root.option_add('*font', ('verdana', 12, 'bold'))
    root.title("Class Interaction")
    display = FirstFrame(root)
    root.mainloop()

        Comment

        • Mariostg
          Contributor
          • Sep 2010
          • 332
          #3
          Outstanding! You have no idea how much browsing I did during week-end about this problem...
          Thanks.
          Works fine on python 3.2 by the way.

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