On Nov 17, 2011, at 10:35 AM, Matthias Felleisen wrote: > > On Nov 17, 2011, at 1:13 PM, John Clements wrote: > >> Minor problem: the "end" button. > > Disable it until you have found the end or replace it with '1000 steps' > button > > >> More major problem (?): world/universe code with callbacks. In this case, >> the only way to get the picture moving again would be to manually move the >> stepper to the end step. > > I don't understand this.
Suppose you run a big-bang program that puts a dot on the screen every time you press a key. Now suppose it runs for 1K steps and halts. The user sees that the window is frozen, but probably won't figure out that the way to un-freeze it is to go to the stepper window and advance past the end of the currently-computed steps. > > >> For these reasons (and a general gut feeling), I think it's better to treat >> the stepper as a parallel process that's sending messages over to the UI >> side. > > That's another good solution. I read this as you agreeing with my earlier dialog box suggestion; am I reading this correctly? John
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