Matt's examples

Demo/tkinter/matt/canvas-with-scrollbars.py

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+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??????", 
+				     Pack : {"side" : "top"}})
+	
+	self.QUIT = Button(self, {'text': 'QUIT', 
+				  'bg': 'red', 
+				  "height" : "3", 
+				  'command': self.quit})
+	self.QUIT.pack({'side': 'bottom', 'fill': 'both'})	
+	spacer = Frame(self, {"height" : "0.25i", 
+			      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", 
+				  "bg" : "white", 
+				  "scrollregion" : "0i 0i 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['xscroll'] = self.draw.scrollX.set
+	self.draw['yscroll'] = 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_polygon("0i", "0i", "3.5i", "0i", "3.5i", "3.5i", "0i" , "3.5i")
+	self.draw.create_polygon("10i", "10i", "13.5i", "10i", "13.5i", "13.5i", "10i" , "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()