On Mon, Aug 3, 2015 at 11:36 PM, Offray Vladimir Luna Cárdenas <offray@riseup.net> wrote:
Peter, I like your proposed syntax. Seems more understandable (but I don't know nothing about announcements).

Announcements are Pharo's event system.... and I am kind of surprised that there is no chapter about it in neither Pharo books. Because it definitely should be there.
Unfortunately I have no idea where I learned announcements (quite possibly from exploring code), maybe this could help http://pharo.gemtalksystems.com/book/LanguageAndLibraries/announcements/ or google, sorry. :(


 

Cheers,

Offray


On 27/07/15 16:51, Peter Uhnák wrote:
Instead of (or alongside) a callback

anElement addCallback: (TRExtentCallback block: [ :event | "do something" ])

have an event

anElement when: TRExtentChanged do: [ :event | "do something" ]

While it looks like a subtle difference it's more versatile and doesn't introduce a different way to do things, when we already perfectly feasible way in pharo - Announcements.

And I am asking what do you think about such proposition.

Cheers,
Peter


On Mon, Jul 27, 2015 at 10:03 PM, Alexandre Bergel <alexandre.bergel@me.com> wrote:
Hi Peter,

I do not know whether this is the jetlag effect or not, but I do not understand your email.

What do you mean that a callback be attached just like regular event? 

Cheers,
Alexandre
-- 
_,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:
Alexandre Bergel  http://www.bergel.eu
^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.



On Jul 27, 2015, at 6:55 AM, Peter Uhnák <i.uhnak@gmail.com> wrote:

Hi,

this is just an idea that's been bugging me for some time...
what if callbacks could be attached just like regular events?

e.g.
aBox when: TRExtentChanged do: [ :event | (self parentFor: aBox) rebuild ]

Is there benefit in having some events as events and some as callbacks? Isn't event more versatile?

What do you think?

I should probably check how this is done in Bloc...

Peter
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