[squeak-dev] Execute code when a Morph is destroyed
bert at freudenbergs.de
Tue Jan 6 20:57:58 UTC 2009
On 06.01.2009, at 20:48, Igor Stasenko wrote:
> 2009/1/6 Séverin Lemaignan <skadge at gmail.com>:
>> I would like to execute some code (closing a serial port) when a
>> is destroyed by an user (either by clicking on the cross or by
>> drag&dropping the morph to the bin). Do you know how to do that?
You could override #delete.
> Use finalization for closing any external resources being used by
> squeak-based objects.
Finalization should be used only as a last measure to avoid leaking
system resources. It can take a very long time from the point where an
object becomes unreachable until it is finalized.
> As a bonus question, is it possible to detect, on the contrary, when a
> morph is restored from the bin (to reestablish the communication) ?
Implementing #intoWorld: and #outOfWorld: should work (instead of
putting this into #delete).
- Bert -
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