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[REBOL] Re: Sticky Button Down State

From: greggirwin:mindspring at: 30-Jun-2003 22:28

Hi Daril, DN> I can see the necessary extra work and code when programming for the DN> real world. Sadly much simplicity and elegance are DN> lost, especially after adding all the try/attempt code. I don't have time to respond in proper detail, but don't forget that this is true for any event driven system, not just REBOL (I'm guessing you know that, so I say it for the benefit of lurkers who may not). I remember reviewing VB apps suffering from cascading events and unhandled multiply-triggered events (multivents? :). So, what to do? In small apps, you can treat things specifically with only minor pain and suffering but, as you point out, a loss of elegance and simplicity. In more complex situations another solution may be called for. I haven't done it, but you could probably write styles that handle multivents at least better than the raw styles do now. My main tool against this kind of problem is a state machine. Events are placed into a queue and dispatched from there. It means thinking about things in a different way, and isn't always a good fit but it's served me well in both VB and REBOL. -- Gregg