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      1 from Tkinter import *
      2 
      3 # this file demonstrates a more sophisticated movement --
      4 # move dots or create new ones if you click outside the dots
      5 
      6 class Test(Frame):
      7     ###################################################################
      8     ###### Event callbacks for THE CANVAS (not the stuff drawn on it)
      9     ###################################################################
     10     def mouseDown(self, event):
     11         # see if we're inside a dot. If we are, it
     12         # gets tagged as CURRENT for free by tk.
     13         if not event.widget.find_withtag(CURRENT):
     14             # there is no dot here, so we can make one,
     15             # and bind some interesting behavior to it.
     16             # ------
     17             # create a dot, and mark it as CURRENT
     18             fred = self.draw.create_oval(
     19                 event.x - 10, event.y -10, event.x +10, event.y + 10,
     20                 fill="green", tags=CURRENT)
     21 
     22             self.draw.tag_bind(fred, "<Any-Enter>", self.mouseEnter)
     23             self.draw.tag_bind(fred, "<Any-Leave>", self.mouseLeave)
     24 
     25         self.lastx = event.x
     26         self.lasty = event.y
     27 
     28     def mouseMove(self, event):
     29         self.draw.move(CURRENT, event.x - self.lastx, event.y - self.lasty)
     30         self.lastx = event.x
     31         self.lasty = event.y
     32 
     33     ###################################################################
     34     ###### Event callbacks for canvas ITEMS (stuff drawn on the canvas)
     35     ###################################################################
     36     def mouseEnter(self, event):
     37         # the CURRENT tag is applied to the object the cursor is over.
     38         # this happens automatically.
     39         self.draw.itemconfig(CURRENT, fill="red")
     40 
     41     def mouseLeave(self, event):
     42         # the CURRENT tag is applied to the object the cursor is over.
     43         # this happens automatically.
     44         self.draw.itemconfig(CURRENT, fill="blue")
     45 
     46     def createWidgets(self):
     47         self.QUIT = Button(self, text='QUIT', foreground='red',
     48                            command=self.quit)
     49         self.QUIT.pack(side=LEFT, fill=BOTH)
     50         self.draw = Canvas(self, width="5i", height="5i")
     51         self.draw.pack(side=LEFT)
     52 
     53         Widget.bind(self.draw, "<1>", self.mouseDown)
     54         Widget.bind(self.draw, "<B1-Motion>", self.mouseMove)
     55 
     56     def __init__(self, master=None):
     57         Frame.__init__(self, master)
     58         Pack.config(self)
     59         self.createWidgets()
     60 
     61 test = Test()
     62 test.mainloop()
     63