canvas-with-scrollbars.py

reduced python source for embedded apps

from Tkinter import *

# This example program creates a scroling canvas, and demonstrates 
# how to tie scrollbars and canvses together. The mechanism
# is analogus for listboxes and other widgets with
# "xscroll" and "yscroll" configuration options.

class Test(Frame):
    def printit(self):
	print "hi"

    def createWidgets(self):
	self.question = Label(self, text="Can Find The BLUE Square??????")
	self.question.pack()

	self.QUIT = Button(self, text='QUIT', background='red', 
			   height=3, command=self.quit)
	self.QUIT.pack(side=BOTTOM, fill=BOTH)	
	spacer = Frame(self, height="0.25i")
	spacer.pack(side=BOTTOM)

	# notice that the scroll region (20" x 20") is larger than 
	# displayed size of the widget (5" x 5")
	self.draw = Canvas(self, width="5i", height="5i",
			   background="white",
			   scrollregion=(0, 0, "20i", "20i"))

	self.draw.scrollX = Scrollbar(self, orient=HORIZONTAL)
	self.draw.scrollY = Scrollbar(self, orient=VERTICAL)

	# now tie the three together. This is standard boilerplate text
	self.draw['xscrollcommand'] = self.draw.scrollX.set
	self.draw['yscrollcommand'] = self.draw.scrollY.set
	self.draw.scrollX['command'] = self.draw.xview
	self.draw.scrollY['command'] = self.draw.yview

	# draw something. Note that the first square 
	# is visible, but you need to scroll to see the second one.
	self.draw.create_rectangle(0, 0, "3.5i", "3.5i", fill="black")
	self.draw.create_rectangle("10i", "10i", "13.5i", "13.5i", fill="blue")

	# pack 'em up
	self.draw.scrollX.pack(side=BOTTOM, fill=X)
	self.draw.scrollY.pack(side=RIGHT, fill=Y)
	self.draw.pack(side=LEFT)


    def scrollCanvasX(self, *args): 
	print "scrolling", args
	print self.draw.scrollX.get()


    def __init__(self, master=None):
	Frame.__init__(self, master)
	Pack.config(self)
	self.createWidgets()

test = Test()

test.mainloop()