tkinter Root and Widget Sub-Classing (That works!)

tkinter is a widget framework but beset with object problems.  Here is a working  example that will work reliably.

• 'side-loading' is the preferred method that finally works. Using inheritance is always problematic. Therefore consider:

import time
import tkinter as tk
import os
from tkinter import *
from tkinter.ttk import *
import tkinter.ttk as ttk


class FCustomWidget:
    def __init__(self, x, y, width, height):

        self.widget = Canvas()
        self.widget.grid_forget()
        self.widget.config(background="#959595")
        self.widget.place(x=x, y=x, width=width, height=height)
        self.x = 5
        self.y = 5
        self.width = width
        self.height = height
        self.data = None

    def root_configure(self, width, height):
        self.x = 5
        self.y = 5
        self.width = width - 15
        self.height = height - 15
        self.widget.place(x=self.x, y=self.y, width=self.width, height=self.height)
        self.widget.update()


class FRootTester:

    def __init__(self, x, y, width, height):
        self.root = tk.Tk()

        self.root.title("Root tester")
        self.root.resizable(True, True)
        self.root.configure(background="#444444")
        self.widget = FCustomWidget(5, 5, 795, 595)

        self.x = x
        self.y = y
        self.width = width
        self.height = height

        self.root.bind("<Configure>", self.rootconfig)
        self.root.mainloop()


    def rootconfig(self, event):

        # Do NOT use event.width and event.height even though they are registered in the event as they do NOT
        # reflect the size of the root!
        width = self.root.winfo_width()
        height = self.root.winfo_height()

        x = event.x
        y = event.y

        if width != self.width or height != self.height:
            self.width = width
            self.height = height
            print("rootconfig: {x}, {y}, {width}, {height}".format(x=x, y=y, width=width, height=height))
            self.widget.root_configure(width, height)


FRootTester( 100, 100, 800, 600)

It should be noted - No parent passed!!!

self.widget = Canvas()  

However when it runs it properly assumes its child position inside the parent class of FRootTester.  

Will have proper resizing for absolute layouts (those who prefer it..)