75 lines
No EOL
2 KiB
JavaScript
75 lines
No EOL
2 KiB
JavaScript
/*
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import Signal
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import Maybe
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*/
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(function() {
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'use strict';
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function timeNow() { return (new window.Date).getTime(); }
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function fpsWhen(desiredFPS, isOn) {
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var msPerFrame = 1000 / desiredFPS;
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var prev = timeNow(), curr = prev, diff = 0, wasOn = true;
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var ticker = Elm.Signal.constant(diff);
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function tick(zero) { return function() {
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curr = timeNow();
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diff = zero ? 0 : curr - prev;
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prev = curr;
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Dispatcher.notify(ticker.id, diff);
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};
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}
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var timeoutID = 0;
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function f(isOn, t) {
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if (isOn) {
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timeoutID = setTimeout(tick(!wasOn && isOn), msPerFrame);
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} else if (wasOn) {
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clearTimeout(timeoutID);
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}
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wasOn = isOn;
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return t;
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}
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return Elm.Signal.lift2(F2(f))(isOn)(ticker);
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}
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function everyWhen(t, isOn) {
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var clock = Elm.Signal.constant(timeNow());
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function tellTime() { Dispatcher.notify(clock.id, timeNow()); }
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setInterval(tellTime, t);
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return clock;
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}
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function since(t, s) {
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function cmp(a,b) { return !Value.eq(a,b) }
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var dcount = Elm.Signal.count(Elm.Signal.delay(t)(s));
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return Elm.Signal.lift2(F2(cmp))(Elm.Signal.count(s))(dcount);
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}
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function after(t) {
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t *= 1000;
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var thread = Elm.Signal.constant(false);
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setTimeout(function() { Dispatcher.notify(thread.id, true); }, t);
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return thread;
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}
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function before(t) {
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t *= 1000;
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var thread = Elm.Signal.constant(true);
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setTimeout(function() { Dispatcher.notify(thread.id, false); }, t);
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return thread;
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}
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function read(s) {
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var t = window.Date.parse(s);
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return isNaN(t) ? Elm.Maybe.Nothing : Elm.Maybe.Just(t);
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}
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Elm.Native.Time = {
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fpsWhen : F2(fpsWhen),
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fps : function(t) { return fpsWhen(t, Elm.Signal.constant(true)); },
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every : function(t) { return everyWhen(t, Elm.Signal.constant(true)) },
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delay : Elm.Signal.delay,
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since : F2(since),
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after : after,
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before : before,
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toDate : function(t) { return new window.Date(t); },
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read : read
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};
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}()); |