TkinterScrollExample

Example Python program TkinterScrollExample.py

Modules

• import tkinter as tk

Methods

• def updateScrollRegion():
• def createScrollableContainer():
• def addNewLabel():

Code

Python tkinter example

import tkinter as tk

root = tk.Tk()

# Tkinter widgets needed for scrolling.  The only native scrollable container that Tkinter provides is a canvas.
# A Frame is needed inside the Canvas so that widgets can be added to the Frame and the Canvas makes it scrollable.
cTableContainer = tk.Canvas(root)
fTable = tk.Frame(cTableContainer)
sbHorizontalScrollBar = tk.Scrollbar(root)
sbVerticalScrollBar = tk.Scrollbar(root)

# Updates the scrollable region of the Canvas to encompass all the widgets in the Frame
def updateScrollRegion():
    cTableContainer.update_idletasks()
    cTableContainer.config(scrollregion=fTable.bbox())

# Sets up the Canvas, Frame, and scrollbars for scrolling
def createScrollableContainer():
    cTableContainer.config(xscrollcommand=sbHorizontalScrollBar.set,yscrollcommand=sbVerticalScrollBar.set, highlightthickness=0)
    sbHorizontalScrollBar.config(orient=tk.HORIZONTAL, command=cTableContainer.xview)
    sbVerticalScrollBar.config(orient=tk.VERTICAL, command=cTableContainer.yview)

    sbHorizontalScrollBar.pack(fill=tk.X, side=tk.BOTTOM, expand=tk.FALSE)
    sbVerticalScrollBar.pack(fill=tk.Y, side=tk.RIGHT, expand=tk.FALSE)
    cTableContainer.pack(fill=tk.BOTH, side=tk.LEFT, expand=tk.TRUE)
    cTableContainer.create_window(0, 0, window=fTable, anchor=tk.NW)

# Adds labels diagonally across the screen to demonstrate the scrollbar adapting to the increasing size
i=0
def addNewLabel():
    global i
    tk.Label(fTable, text="Hello World").grid(row=i, column=i)
    i+=1

    # Update the scroll region after new widgets are added
    updateScrollRegion()

    root.after(1000, addNewLabel)

createScrollableContainer()
addNewLabel()

root.mainloop()

Useful Links

• Articles: https://python-commandments.org/
• Python shell: https://bsdnerds.org/learn-python/
• Tutorial: https://pythonprogramminglanguage.com/