Matt's examples

Demo/tkinter/matt/rubber-band-box-demo-1.py

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+from Tkinter import *
+
+class Test(Frame):
+    def printit(self):
+	print "hi"
+
+    def createWidgets(self):
+	self.QUIT = Button(self, {'text': 'QUIT', 
+				  'bg': 'red', 
+				  'fg': 'white', 
+				  'height' : 3, 
+				  'command': self.quit})
+	self.QUIT.pack({'side': 'bottom', 'fill': 'both'})	
+
+	self.canvasObject = Canvas(self, {"width" : "5i", "height" : "5i"})
+	self.canvasObject.pack({'side': 'left'})
+
+    def mouseDown(self, event):
+	# canvas x and y take the screen coords from the event and translate
+	# them into the coordinate system of the canvas object
+	self.startx = self.canvasObject.canvasx(event.x)
+	self.starty = self.canvasObject.canvasy(event.y)
+
+    def mouseMotion(self, event):
+	# canvas x and y take the screen coords from the event and translate
+	# them into the coordinate system of the canvas object
+	x = self.canvasObject.canvasx(event.x)
+	y = self.canvasObject.canvasy(event.y)
+
+	if (self.startx != event.x)  and (self.starty != event.y) : 
+	    self.canvasObject.delete(self.rubberbandBox)
+	    self.rubberbandBox = self.canvasObject.create_rectangle(self.startx, self.starty, x, y)
+	    # this flushes the output, making sure that 
+	    # the rectangle makes it to the screen 
+	    # before the next event is handled
+	    self.update_idletasks()
+
+    def mouseUp(self, event):
+	self.canvasObject.delete(self.rubberbandBox)
+	
+    def __init__(self, master=None):
+	Frame.__init__(self, master)
+	Pack.config(self)
+	self.createWidgets()
+
+	# this is a "tagOrId" for the rectangle we draw on the canvas
+	self.rubberbandBox = None
+	
+	# and the bindings that make it work..
+	Widget.bind(self.canvasObject, "<Button-1>", self.mouseDown)
+	Widget.bind(self.canvasObject, "<Button1-Motion>", self.mouseMotion)
+	Widget.bind(self.canvasObject, "<Button1-ButtonRelease>", self.mouseUp)
+	
+
+test = Test()
+
+test.mainloop()