penpot/frontend/src/app/util/timers.cljs
2021-04-12 16:49:43 +02:00

63 lines
1.5 KiB
Clojure

;; This Source Code Form is subject to the terms of the Mozilla Public
;; License, v. 2.0. If a copy of the MPL was not distributed with this
;; file, You can obtain one at http://mozilla.org/MPL/2.0/.
;;
;; Copyright (c) UXBOX Labs SL
(ns app.util.timers
(:require
[beicon.core :as rx]
[promesa.core :as p]))
(defn schedule
([func]
(schedule 0 func))
([ms func]
(let [sem (js/setTimeout #(func) ms)]
(reify rx/IDisposable
(-dispose [_]
(js/clearTimeout sem))))))
(defn dispose!
[v]
(rx/dispose! v))
(defn asap
[f]
(-> (p/resolved nil)
(p/then f)))
(defn interval
[ms func]
(let [sem (js/setInterval #(func) ms)]
(reify rx/IDisposable
(-dispose [_]
(js/clearInterval sem)))))
(if (and (exists? js/window) (.-requestIdleCallback js/window))
(do
(def ^:private request-idle-callback #(js/requestIdleCallback %))
(def ^:private cancel-idle-callback #(js/cancelIdleCallback %)))
(do
(def ^:private request-idle-callback #(js/setTimeout % 100))
(def ^:private cancel-idle-callback #(js/clearTimeout %))))
(defn schedule-on-idle
[func]
(let [sem (request-idle-callback #(func))]
(reify rx/IDisposable
(-dispose [_]
(cancel-idle-callback sem)))))
(def ^:private request-animation-frame
(or (and (exists? js/window) (.-requestAnimationFrame js/window))
#(js/setTimeout % 16)))
(defn raf
[f]
(request-animation-frame f))
(defn idle-then-raf
[f]
(schedule-on-idle #(raf f)))