On Sat, Apr 21, 2012 at 10:47 AM, HwaJong Oh <daliot.oh@gmail.com> wrote:

My program wants to detect image save event. I couldn't find one, so changed
SmalltalkImage>>logChanged: or SmalltalkImage>>addSnapshot:andQuit: to
detect the image save and fire my custom notification.

That makes sense.
�

Is there a good for doing this like SystemChangeNotification or
SystemAnnouncement?

The good solution I guess it would be SystemAnnouncement.
Anyway, if you want a dirty solution without changing the system, you can have your custom class that adds itself to Smalltalk shutDownList
and then it implements #shutDown:�
this will be called also when saving the image. See senders of #processShutDownList:
�
Cheers

HwaJong

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