1from Tkinter import * 2 3# this is the same as simple-demo-1.py, but uses 4# subclassing. 5# note that there is no explicit call to start Tk. 6# Tkinter is smart enough to start the system if it's not already going. 7 8class Test(Frame): 9 def printit(self): 10 print "hi" 11 12 def createWidgets(self): 13 self.QUIT = Button(self, text='QUIT', 14 background='red', 15 foreground='white', 16 height=3, 17 command=self.quit) 18 self.QUIT.pack(side=BOTTOM, fill=BOTH) 19 20 self.canvasObject = Canvas(self, width="5i", height="5i") 21 self.canvasObject.pack(side=LEFT) 22 23 def mouseDown(self, event): 24 # canvas x and y take the screen coords from the event and translate 25 # them into the coordinate system of the canvas object 26 self.startx = self.canvasObject.canvasx(event.x, self.griddingSize) 27 self.starty = self.canvasObject.canvasy(event.y, self.griddingSize) 28 29 def mouseMotion(self, event): 30 # canvas x and y take the screen coords from the event and translate 31 # them into the coordinate system of the canvas object 32 x = self.canvasObject.canvasx(event.x, self.griddingSize) 33 y = self.canvasObject.canvasy(event.y, self.griddingSize) 34 35 if (self.startx != event.x) and (self.starty != event.y) : 36 self.canvasObject.delete(self.rubberbandBox) 37 self.rubberbandBox = self.canvasObject.create_rectangle( 38 self.startx, self.starty, x, y) 39 # this flushes the output, making sure that 40 # the rectangle makes it to the screen 41 # before the next event is handled 42 self.update_idletasks() 43 44 def __init__(self, master=None): 45 Frame.__init__(self, master) 46 Pack.config(self) 47 self.createWidgets() 48 49 # this is a "tagOrId" for the rectangle we draw on the canvas 50 self.rubberbandBox = None 51 52 # this is the size of the gridding squares 53 self.griddingSize = 50 54 55 Widget.bind(self.canvasObject, "<Button-1>", self.mouseDown) 56 Widget.bind(self.canvasObject, "<Button1-Motion>", self.mouseMotion) 57 58 59test = Test() 60 61test.mainloop() 62