jwebster jwebster - 1 year ago 56
Python Question

How to attach a Scrollbar to a Text widget?

I am probably over-thinking this, but for some reason I can't seem to figure this out. I am trying to attach a scrollbar to my Text field and have been unable to do so. Here is the segment of code:

self.scroller = Scrollbar(self.root)
self.scroller.place(x=706, y=121)
self.outputArea = Text(self.root, height=26, width=100)
self.outputArea.place(x=0, y=120)
self.outputArea.config(state=DISABLED, yscrollcommand = self.scroller.set)

This code is placing a very small scrollbar right next to my text field (and by very small, I mean that you can see the up and down arrows but nothing in between). I can scroll with it when my text field fills up, but is there a way to at the very least set the height of the scrollbar so that it appears to be the same height as the text field?

Answer Source

Tkinter has three geometry managers: pack, grid, and place.
Pack and grid are usually recommended over place.

You can use the grid manager's row and column options
to position the Scrollbar next to the Text widget.

Set the Scrollbar widget's command option to the Text's yview method.

scrollb = tki.Scrollbar(..., command=txt.yview)

Set the Text widget's yscrollcommand option to the Scrollbar's set method.

txt['yscrollcommand'] = scrollb.set

Here's a working example:

import Tkinter as tki # Tkinter -> tkinter in Python3

class App(object):

    def __init__(self):
        self.root = tki.Tk()

    # create a Frame for the Text and Scrollbar
        txt_frm = tki.Frame(self.root, width=600, height=600)
        txt_frm.pack(fill="both", expand=True)
        # ensure a consistent GUI size
        # implement stretchability
        txt_frm.grid_rowconfigure(0, weight=1)
        txt_frm.grid_columnconfigure(0, weight=1)

    # create a Text widget
        self.txt = tki.Text(txt_frm, borderwidth=3, relief="sunken")
        self.txt.config(font=("consolas", 12), undo=True, wrap='word')
        self.txt.grid(row=0, column=0, sticky="nsew", padx=2, pady=2)

    # create a Scrollbar and associate it with txt
        scrollb = tki.Scrollbar(txt_frm, command=self.txt.yview)
        scrollb.grid(row=0, column=1, sticky='nsew')
        self.txt['yscrollcommand'] = scrollb.set

app = App()

The part that will address your Scrollbar being small is sticky='nsew',
which you can read about → here or here.

Something that will be helpful for you to learn right now is that different Tkinter widgets can use different geometry managers within the same program as long as they do not share the same parent.

It's also worth mentioning that there is the ScrolledText module (renamed tkinter.scrolledtext in Python3). It contains a class that is also called ScrolledText which is a compound widget (Text & Scrollbar).

# Python 2.7
import Tkinter as tki
from ScrolledText import ScrolledText

class App(object):

    def __init__(self):
        self.root = tki.Tk()

    # create a Text widget with a Scrollbar attached
        self.txt = ScrolledText(self.root, undo=True)
        self.txt['font'] = ('consolas', '12')
        self.txt.pack(expand=True, fill='both')

app = App()
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