Editing: canvas-moving-w-mouse.py
from Tkinter import * # this file demonstrates the movement of a single canvas item under mouse control class Test(Frame): ################################################################### ###### Event callbacks for THE CANVAS (not the stuff drawn on it) ################################################################### def mouseDown(self, event): # remember where the mouse went down self.lastx = event.x self.lasty = event.y def mouseMove(self, event): # whatever the mouse is over gets tagged as CURRENT for free by tk. self.draw.move(CURRENT, event.x - self.lastx, event.y - self.lasty) self.lastx = event.x self.lasty = event.y ################################################################### ###### Event callbacks for canvas ITEMS (stuff drawn on the canvas) ################################################################### def mouseEnter(self, event): # the CURRENT tag is applied to the object the cursor is over. # this happens automatically. self.draw.itemconfig(CURRENT, fill="red") def mouseLeave(self, event): # the CURRENT tag is applied to the object the cursor is over. # this happens automatically. self.draw.itemconfig(CURRENT, fill="blue") def createWidgets(self): self.QUIT = Button(self, text='QUIT', foreground='red', command=self.quit) self.QUIT.pack(side=LEFT, fill=BOTH) self.draw = Canvas(self, width="5i", height="5i") self.draw.pack(side=LEFT) fred = self.draw.create_oval(0, 0, 20, 20, fill="green", tags="selected") self.draw.tag_bind(fred, "<Any-Enter>", self.mouseEnter) self.draw.tag_bind(fred, "<Any-Leave>", self.mouseLeave) Widget.bind(self.draw, "<1>", self.mouseDown) Widget.bind(self.draw, "<B1-Motion>", self.mouseMove) def __init__(self, master=None): Frame.__init__(self, master) Pack.config(self) self.createWidgets() test = Test() test.mainloop()
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