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How to use Announcements?

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R. Tyler Croy

How to use Announcements?

I'm having trouble figuring out how to use announcements, I'm assuming they're
similar to existing JavaScript events, but I'm not clear on how I should be
creating them, firing them or consuming them.

Any documentation on them would be appreciated :)

- R. Tyler Croy
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Code: https://github.com/rtyler
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Manfred Kröhnert

Re: How to use Announcements?

Hi,

On Sun, Jan 6, 2013 at 7:16 AM, R. Tyler Croy <[hidden email]> wrote:

I'm having trouble figuring out how to use announcements, I'm assuming they're
similar to existing JavaScript events, but I'm not clear on how I should be
creating them, firing them or consuming them.

Any documentation on them would be appreciated :)

- R. Tyler Croy

first you need an instance of Announcer.

The SystemAnnouncer for example can be obtained through

announcerInstance := SystemAnnouncer current.

You can also create your own single instance of Announcer or a subclass of it.

Then you need a class for each announcement (see SystemAnnouncement and subclasses).

Announcement classes don't necessarily need any methods.

Sending announcements is as easy as:

announcerInstance announce: AnnouncementClass new.

For receiving announcements you have to register a callback for the desired announcement class like the following:

announcerInstance on: AnnouncementClass do: [:announcement | "do something when announcement occurs"].

Hope this helps.

Best,

Manfred