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      1 from Tkinter import *
      2 
      3 # this file demonstrates the movement of a single canvas item under mouse control
      4 
      5 class Test(Frame):
      6     ###################################################################
      7     ###### Event callbacks for THE CANVAS (not the stuff drawn on it)
      8     ###################################################################
      9     def mouseDown(self, event):
     10         # remember where the mouse went down
     11         self.lastx = event.x
     12         self.lasty = event.y
     13 
     14     def mouseMove(self, event):
     15         # whatever the mouse is over gets tagged as CURRENT for free by tk.
     16         self.draw.move(CURRENT, event.x - self.lastx, event.y - self.lasty)
     17         self.lastx = event.x
     18         self.lasty = event.y
     19 
     20     ###################################################################
     21     ###### Event callbacks for canvas ITEMS (stuff drawn on the canvas)
     22     ###################################################################
     23     def mouseEnter(self, event):
     24         # the CURRENT tag is applied to the object the cursor is over.
     25         # this happens automatically.
     26         self.draw.itemconfig(CURRENT, fill="red")
     27 
     28     def mouseLeave(self, event):
     29         # the CURRENT tag is applied to the object the cursor is over.
     30         # this happens automatically.
     31         self.draw.itemconfig(CURRENT, fill="blue")
     32 
     33     def createWidgets(self):
     34         self.QUIT = Button(self, text='QUIT', foreground='red',
     35                            command=self.quit)
     36         self.QUIT.pack(side=LEFT, fill=BOTH)
     37         self.draw = Canvas(self, width="5i", height="5i")
     38         self.draw.pack(side=LEFT)
     39 
     40         fred = self.draw.create_oval(0, 0, 20, 20,
     41                                      fill="green", tags="selected")
     42 
     43         self.draw.tag_bind(fred, "<Any-Enter>", self.mouseEnter)
     44         self.draw.tag_bind(fred, "<Any-Leave>", self.mouseLeave)
     45 
     46         Widget.bind(self.draw, "<1>", self.mouseDown)
     47         Widget.bind(self.draw, "<B1-Motion>", self.mouseMove)
     48 
     49     def __init__(self, master=None):
     50         Frame.__init__(self, master)
     51         Pack.config(self)
     52         self.createWidgets()
     53 
     54 test = Test()
     55 test.mainloop()
     56