Created
February 25, 2015 21:07
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Call f with args every ms milliseconds when document is visible.
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| (defn call-periodically-when-visible | |
| "Call f with args every ms milliseconds when document is visible." | |
| ([ms f] | |
| (letfn [(call [id] | |
| (let [id (if (.-hidden js/document) | |
| (and id (js/clearInterval id) nil) | |
| (js/setInterval f ms))] | |
| (goog.events/listenOnce | |
| js/document "visibilitychange" #(call id))))] | |
| (call nil))) | |
| ([ms f x & args] | |
| (call-periodically-when-visible (fn [] (apply f x args)) ms))) |
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