scrframe.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# Taken from:  bakineugene/scrframe.py (with minor tweaks)
# https://gist.github.com/bakineugene/76c8f9bcec5b390e45df




# from Tkinter import *   # from x import * is bad practice
# from ttk import *

import tkinter as tk
from tkinter import ttk


# http://tkinter.unpythonic.net/wiki/VerticalScrolledFrame

class VerticalScrolledFrame(tk.Frame):
	"""A pure Tkinter scrollable frame that actually works!
	* Use the 'interior' attribute to place widgets inside the scrollable frame
	* Construct and pack/place/grid normally
	* This frame only allows vertical scrolling
	"""
	def __init__(self, master, *args, **kw):
		tk.Frame.__init__(self, master, *args, **kw)            

		# create a canvas object and a vertical scrollbar for scrolling it
		vscrollbar = tk.Scrollbar(self, orient=tk.VERTICAL)
		vscrollbar.pack(fill=tk.Y, side=tk.RIGHT, expand=tk.FALSE)
		self.canvas = canvas = tk.Canvas(self, bd=0, highlightthickness=0,
			yscrollcommand=vscrollbar.set)
		canvas.pack(side=tk.LEFT, fill=tk.BOTH, expand=tk.TRUE)
		vscrollbar.config(command=canvas.yview)

		# reset the view
		canvas.xview_moveto(0)
		canvas.yview_moveto(0)

		# create a frame inside the canvas which will be scrolled with it
		self.interior = interior = tk.Frame(canvas)
		interior_id = canvas.create_window(0, 0, window=interior,
					anchor=tk.NW)

		# track changes to the canvas and frame width and sync them,
		# also updating the scrollbar
		def _configure_interior(event):
			# update the scrollbars to match the size of the inner frame
			size = (interior.winfo_reqwidth(), interior.winfo_reqheight())
			canvas.config(scrollregion="0 0 %s %s" % size)
			if interior.winfo_reqwidth() != canvas.winfo_width():
				# update the canvas's width to fit the inner frame
				canvas.config(width=interior.winfo_reqwidth())
		interior.bind('<Configure>', _configure_interior)

		def _configure_canvas(event):
			if interior.winfo_reqwidth() != canvas.winfo_width():
				# update the inner frame's width to fill the canvas
				canvas.itemconfigure(interior_id, width=canvas.winfo_width())
		canvas.bind('<Configure>', _configure_canvas)



	def ScrollToBottom(self):
		# Move canvas to lower position (4/7/2021)
		self.canvas.update_idletasks()	# Without this line will not work as expected
		self.canvas.yview_moveto(1.0)
		# self.canvas.yview_scroll(1,"pages")    



if __name__ == "__main__":

	class SampleApp(tk.Tk):
		def __init__(self, *args, **kwargs):
			root = tk.Tk.__init__(self, *args, **kwargs)


			self.frame = VerticalScrolledFrame(root)
			self.frame.pack()
			self.label = tk.Label(text="Shrink the window to activate the scrollbar.")
			self.label.pack()
			buttons = []
			for i in range(10):
				buttons.append(tk.Button(self.frame.interior, text="Button " + str(i)))
				buttons[-1].pack()

	app = SampleApp()
	app.mainloop()