Lukas Renggli a écrit : >> > The original code comes from OmniBrowser. I generalized and extended >> > it a little bit, since I use it in several projects. The original idea >> > of announcements comes from Vassili Bykov as described in >> > <http://www.cincomsmalltalk.com/userblogs/vbykov/blogView? >> > showComments=true&entry=3310034894>. >> >> Ok thanks but What is the aim of Annoucements? > > Have a look at Vassili's blog entry, he explains it much more in > detail than I can do here. > > Announcements are a clean and object-oriented replacement for the > #change:, #update: and #triggerEvent: hacks in Squeak and other > Smalltalk's. > > Announcements can be used pretty much the same way as exceptions, > except that they are not limited to the execution stack. Interested > parties can declare their interest for certain events to an announcer: > > announcer > on: SomethingChanged > do: [ :ann | ... ] > > Whenever the owner of the announcer triggers an event, all the > registered blocks are evaluated: > > announcer announce: (SomethingChanged new > foo: 12; > yourself) > > Since announcements are objects they can be passed around, they can > carry data, and they can even modified during the announcement > processing (veto-able announcements). > > That's basically it. > > Lukas >
oops ok I haven't seen the link you given me sorry :-/ _______________________________________________ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
