I've been really enjoying my last month working on a largish app based
on re-frame and not run into any probs. However, today I was going to
refactor another project using animation and came across an issue
which I'm somewhat stumped by:
I created a global tick handler, which is supposed to be an event
generator for various other handlers to update their data in the app
db. Currently this :next-tick handler re-triggers itself like shown
below and runs as predicted (~60Hz via requestAnimationFrame), but for
the purpose of this question this could be triggered at any (lower)
frequency:
(defn re-trigger-timer [] (reagent/next-tick (fn [] (dispatch [:next-tick]))))
(register-handler
:next-tick
(fn [db _]
(re-trigger-timer)
(update db :tick inc)))
Now I'd like to have other handlers which (dynamically) subscribe to
these tick changes, but they should be run without causing another
16ms delay caused from using the subscribe/dispatch mechanism - and I
keep drawing a blank how to achieve this w/o modifying
re-frame.db/app-db directly (outside an handler).
Of course I could create a subscription for the :tick value, run the
related code and return the computed data as derived view during
re-drawing of the related components, but that kind of defeats the
whole purpose and I'd really like these updates to happen in handlers.
I'm sure there's a better way... no?! :)
Could someone please clarify for me?
FWIW the demo app in question is here:
http://demo.thi.ng/geom/physics/strands.html
For starters I'd like to update physics sim via an handler reacting to
:tick changes, but there'll be others too...
Thanks, K.
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