Hello Peter, an answer to an “old” e-mail (from January 25). Sorry for not answering earlier.
Am Freitag, 25. Januar 2008 00:23 schrieben Sie: > Wolfgang Jeltsch wrote: > > Indeed. A functional approach to GUIs is nice but at the moment we don’t > > have anything that is suitable for solving real world problems (although > > this is being worked on). > > Could you elaborate a bit on that? What are the current obstacles to be > solved? Performance problems and lack of widgets are the two things that come to my mind immediately. Maybe also lack of a good way of doing dynamic user interfaces (user interfaces with a changing set/order of widgets). > When I looked at Yampa, I didn't really see a problem with making a GUI > or interactive application based on it (besides maybe performance and > space/time leaks, the latter IMO being a general problem in Haskell that > just occurs quicker in reactive programming). I think, performance is a big problem. To me it seems that Yampa-based GUIs maybe have a performance penalty of more than just a constant factor. Please have a look at the sections “Implementation and efficiency” and “Signals” under <http://haskell.org/haskellwiki/Talk:Grapefruit>. > […] > The main problem I could see is that Yampa is not really event driven in > the imperative sense; I mean in an ideal event based system, the > hardware triggers an interrupt when some sensor changes, and this then > triggers other software events; only the code that is related to > handling the event that occurred is executed. But the event that is > handled could potentially not be needed for the current output (which > could be considered as a programming bug...) Not necessarily a bug. There are events which don’t result in changes of the GUI, for example, mouse clicks into empty areas. > […] Best wishes, Wolfgang _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
