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