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Re: Previous Selection in Spinbox

by stiller (Friar)
on Apr 28, 2008 at 06:59 UTC ( #683248=note: print w/replies, xml ) Need Help??


in reply to Previous Selection in Spinbox

I'd prefer to always have one internal representation of these numbers, and only change the visual representation on request to the current choice. That way I'd avoid this issue, and also I wouldn't have to worry about accummulating errors.

To capture the previous value, is a variant of capturing the current value. In sub change_unit you keep the old choice. When entering that sub, you have a new choice in $dtm_unit, and you have the old in your sub, or in a global, and you can recalculate from old to new, and set $old_unit  = $dtm_unit; for use next time.

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[Corion]: ambrus: Hmmm. It makes sense that AnyEvent would implement the push_write itself, but I think I don't have a good idea of where the boundary between AnyEvent and the underlying event system lies... Implementing the timer should give me a better idea
[ambrus]: Corion: push_write is in the higher level abstraction of AnyEvent::Handle, not in the watcher
[Corion]: ambrus: Hmm - rereading Prima::File, that merrily coincides with what Prima does - it tells you "you can read", and you're supposed to read from the fh yourself. I thought it called you with the data already read, which would've been harder to integrate
[ambrus]: you just need an io watcher, created by &AnyEvent::Impl:: Whatever::io(...)
[Corion]: So after talking it through with you even while I'm still not entirely clear on where AE ends and my implementation begins, I think I understand that I only need to implement some smaller parts for each functionality I want to support.
[Corion]: Yeah... and you might even be able to mix and match additional functionality if you have additional async suppliers, like from a separate thread
[ambrus]: You hvae to be careful with the timer, because apparently Prima::Timer insists on being periodic, wheras AnyEvent::Impl:: Whatever::timer should give a one-shot timer watcher

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