Hey guys,
As I start to work on more Clojurescript UI code, I've been running into
a pattern with atoms and watches that I THINK I can abstract away... but
the solution feels wrong, and I'd love to hear a better way.
Say I'm building a stopwatch for timing runners in a race. I've got a
clojure record like this:
(defrecord StopwatchState [
active? ;; timer running?
timestamp ;; UTC time of this particular state
stopwatch-time ;; the time on the stopwatch as of "timestamp"
results ;; pairs of [athlete number, time]])
and a bunch of functions that toggle the timer, mark an athlete crossing
the line, update the timer, etc.
My view holds the current state in an atom:
(def state (atom ,,some-stopwatch-state))
and I update my views by adding watches to the atom and refreshing the
various UI components to match the new state.
Now! Here's the annoying pattern. In the cljs UI world, to poke these
atoms, I end up wrapping all of my model functions like this:
(defn toggle! []
(swap! state toggle))
(defn mark! [athlete-number]
(swap! state mark athlete-number))
I can think of two ways to break the pattern.
1) A deep-code-walking macro that transforms code like (mark state
athlete-number) into (swap! state mark athlete-number) if the first
argument is an atom;
2) a defstatefn macro that defines the "mark" and "mark!" versions at
the same time.
Both feel wrong. My goal is to program in a more declarative way. Is
there a better way to structure UI code?
--
Sam Ritchie (@sritchie)
Paddleguru Co-Founder
703.863.8561
www.paddleguru.com <http://www.paddleguru.com/>
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