Hi, On Feb 28, 8:32 pm, CuppoJava <patrickli_2...@hotmail.com> wrote: > Hi Itay, > I'm a little confused about one aspect of the context pattern. > > If I understand this write, a listener is a function that takes an old > context, and returns a new context, BUT it also calls the appropriate > GUI functions (setText, setSize) to ensure that the gui state is > consistent with the new context. Is that correct?
Yes. > > If so then the listeners aren't purely functional. They don't affect > any mutable state in atoms or refs, but they mutate the current > running state of the GUI. So side-effects of these functions are > therefore important. Processors/observers may mutate the UI. Yet, even if the processors manipulate the UI, they will not cause observer-issued side effects. Also, the affect of either processors or observers is limited to the UI - their behavior WRT to the program-manged state is side-effect free. Thanks for bringing this up, I wasn't very clear. -Itay --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
