Mouse wheel event for Canvas

[John McMonagle]

I tried binding mouse wheel events (<Button-4>, <Button-5>) to a Tkinter
Canvas widget with the hope of using the event.delta value to
subsequently scroll the Canvas.

However, it seems that event.delta always returns 0.

For example,

from Tkinter import *

r = Tk()
c = Canvas(r, scrollregion=(0,0,500,500), height=200, width=200)
s = Scrollbar(r, command=c.yview)
c.pack(side=LEFT)
s.pack(side=RIGHT, fill=Y)
c.configure(yscrollcommand=s.set)
c.create_rectangle(10,10,100,100)
c.create_rectangle(10,200,100,300)

def rollWheel(event):
    print event.delta

c.bind('<Button-4>', rollWheel)
c.bind('<Button-5>', rollWheel)

c.focus_set()

r.mainloop()


Has anyone successfully managed to wheel scroll a Tkinter Canvas
widget ?

Regards,

John



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