cpython/Lib/tkinter/ScrolledText.py

# A ScrolledText widget feels like a text widget but also has a
# vertical scroll bar on its right.  (Later, options may be added to
# add a horizontal bar as well, to make the bars disappear
# automatically when not needed, to move them to the other side of the
# window, etc.)
#
# Configuration options are passed to the Text widget.
# A Frame widget is inserted between the master and the text, to hold
# the Scrollbar widget.
# Most methods calls are inherited from the Text widget; Pack methods
# are redirected to the Frame widget however.

from Tkinter import *
from Tkinter import _cnfmerge

class ScrolledText(Text):
	def __init__(self, master=None, cnf={}):
		cnf = _cnfmerge(cnf)
		fcnf = {}
		for k in cnf.keys():
			if type(k) == ClassType:
				fcnf[k] = cnf[k]
				del cnf[k]
		self.frame = Frame(master, fcnf)
		self.vbar = Scrollbar(self.frame, {
			Pack: {'side': 'right', 'fill': 'y'}})
		cnf[Pack] = {'side': 'left', 'fill': 'both', 'expand': 'yes'}
		Text.__init__(self, self.frame, cnf)
		self['yscrollcommand'] = (self.vbar, 'set')
		self.vbar['command'] = (self, 'yview')

		# Copy Pack methods of self.frame -- hack!
		for m in Pack.__dict__.keys():
			if m[0] != '_' and m != 'config':
				setattr(self, m, getattr(self.frame, m))