Tkinter: How to bind an event that repeats if continued to be selected

[Martyn Quick]

Hi All!

The following appears to be a bit difficult, but probably it isn't if you
are an expert.

I've created a `counter'-like widget as shown below.  Basically if you
click on the arrow button it increases the value displayed in the entry.

My question is what do I have to change in the bindings to make it behave
slightly differently, namely if you click on the arrow button and hold,
then after a while it begins to automatically increase (i.e., repeatedly
call  self.increment  until you release?

Many thanks in advance for any help!

Yours,

Martyn Quick

--------------CODE FOLLOWS-------------------

import Pmw, Tkinter

class Counter(Pmw.MegaWidget):

    def __init__(self, parent=None):
        Pmw.MegaWidget.__init__(self, parent)
        interior = self.interior()
        self.var = Tkinter.IntVar()
        self.createcomponent(
            'entry', (), None, Tkinter.Entry, (interior,),
            state='disabled', textvariable=self.var,
            width=5).pack(side='left')
        self.arrow = self.createcomponent(
            'arrow', (), None, Tkinter.Canvas, (interior,), width=16,
            height=16, relief='raised', borderwidth=1)
        self.arrow.pack()
        Pmw.drawarrow(self.arrow, 'black', 'up', 'arrow')
        self.arrow.bind('<1>', self.increment)
        self.arrow.bind('<Any-ButtonRelease-1>', self.release)

    def increment(self, event):
        self.arrow.config(relief='sunken')
        self.var.set(self.var.get()+1)

    def release(self, event):
        self.arrow.config(relief='raised')

--------------------------------------------------------
Dr. Martyn Quick  (Lecturer in Pure Mathematics)
University of Birmingham, Edgbaston, Birmingham, UK.
http://www.mat.bham.ac.uk/M.R.Quick/