1from Tkinter import * 2 3class Test(Frame): 4 def printit(self): 5 print "hi" 6 7 def createWidgets(self): 8 self.QUIT = Button(self, text='QUIT', 9 background='red', 10 foreground='white', 11 height=3, 12 command=self.quit) 13 self.QUIT.pack(side=BOTTOM, fill=BOTH) 14 15 self.canvasObject = Canvas(self, width="5i", height="5i") 16 self.canvasObject.pack(side=LEFT) 17 18 def mouseDown(self, event): 19 # canvas x and y take the screen coords from the event and translate 20 # them into the coordinate system of the canvas object 21 self.startx = self.canvasObject.canvasx(event.x) 22 self.starty = self.canvasObject.canvasy(event.y) 23 24 def mouseMotion(self, event): 25 # canvas x and y take the screen coords from the event and translate 26 # them into the coordinate system of the canvas object 27 x = self.canvasObject.canvasx(event.x) 28 y = self.canvasObject.canvasy(event.y) 29 30 if (self.startx != event.x) and (self.starty != event.y) : 31 self.canvasObject.delete(self.rubberbandBox) 32 self.rubberbandBox = self.canvasObject.create_rectangle( 33 self.startx, self.starty, x, y) 34 # this flushes the output, making sure that 35 # the rectangle makes it to the screen 36 # before the next event is handled 37 self.update_idletasks() 38 39 def mouseUp(self, event): 40 self.canvasObject.delete(self.rubberbandBox) 41 42 def __init__(self, master=None): 43 Frame.__init__(self, master) 44 Pack.config(self) 45 self.createWidgets() 46 47 # this is a "tagOrId" for the rectangle we draw on the canvas 48 self.rubberbandBox = None 49 50 # and the bindings that make it work.. 51 Widget.bind(self.canvasObject, "<Button-1>", self.mouseDown) 52 Widget.bind(self.canvasObject, "<Button1-Motion>", self.mouseMotion) 53 Widget.bind(self.canvasObject, "<Button1-ButtonRelease>", self.mouseUp) 54 55 56test = Test() 57 58test.mainloop() 59