[Newbies] Callback

Bert Freudenberg bert at freudenbergs.de
Thu Oct 9 14:15:01 UTC 2008

Am 09.10.2008 um 16:07 schrieb Bert Freudenberg:

> Am 09.10.2008 um 15:54 schrieb xyz 42:
>> Hello!  I want to create a callback that will call my method after,
>> say, 10 minutes.  How can I do it in squeak?
> [(Delay forDuration: 10 minutes) wait. self myMethod] fork
> This forks off a background process, waits 10 minutes, then calls  
> myMethod. Note that a lot of code will break when called from a  
> background process, you will have to worry about synchronization.  
> Especially you must not call UI code from the background (there are  
> of course ways to allow that).

Seeing three very similar responses, here is another, safer way to do  
it for UI stuff. In a Morph subclass, you can say

	self addAlarm: #myMethod after: 10 minutes asMilliSeconds

This will call myMethod synchronously so you do not have to worry  
about background processes.

- Bert -

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