[R] tcltk: repeat event while button is down?

[Duncan Murdoch]

On 05 Aug 2004 22:55:10 +0200, Peter Dalgaard
<p.dalgaard at biostat.ku.dk> wrote :

>Duncan Murdoch <murdoch at stats.uwo.ca> writes:
>
>> Is there a way in TCL/TK to trigger an event multiple times while a
>> button is held down?  I'd like to have an rgl scene continuously
>> rotate until the button is released.
>
>Something involving "after", I'd say. Set up the rotate action to
>reschedule itself after N milliseconds, and the button release event
>to "after cancel". 

Thanks.  Just one more detail:  the docs I have must be old, they
don't talk about separate button press and button release events.  How
do I attach separate event handlers to those?

Duncan