TK binding mouse wheel scroll to scrolled list

[ilikepython]

I have a class that I use for a scrolled list. The problem is I want to be able to scroll the list using the mouse wheel. I am using bind and it's not working:
[code=python]
class ScrolledList(Fr ame):
def __init__(self, parent = None):
Frame.__init__( self, parent)
self.box = Listbox(self)
... more code ...

self.box.bind(" <MouseWheel>" , self.wheelscrol l)

def wheelscroll(sel f, event):
if event.delta > 0:
self.box.yview_ scroll(-2, 'units')
else:
self.box.yview_ scroll(2, 'units')
[/code]
I also tried binding to the Frame but that doesn't work. I think the problem is the box isn't getting the messages, but then what should I bind to? Also, If I don't bind to the box, what happens if I have more than one scrolled list in one frame?

[bartonc]

Hi John,

here is a code snippet I have successfully used:

self.canvas.bin d('<4>', lambda event : self.canvas.xvi ew('scroll', -1, 'units'))
self.canvas.bin d('<5>', lambda event : self.canvas.xvi ew('scroll', 1, 'units'))

or if you do not like the lambda, you can use a callback like this:

def rollWheel(event ):
if event.num == 4:
self.canvas.xvi ew('scroll', -1, 'units')
elif event.num == 5:
self.canvas.xvi ew('scroll', 1, 'units')

I hope this helps

From mail.python.org/pipemail, June of '06.

Hope that helps.

[ilikepython]

From mail.python.org/pipemail, June of '06.

Hope that helps.

Well I found that same page too, but it turns out that button 4 and 5 work only on linux, and on windows you have to use the mousewheel event.

[ilikepython]

I figured it out. The problem was that the list box never got focus. I added this line and it worked:
[code=python]
self.box.bind(" <Button-1>", lambda x: self.box.focus( ))
[/code]