39 lines
886 B
JavaScript
39 lines
886 B
JavaScript
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Elm.Native.Keyboard = function(elm) {
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'use strict';
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elm.Native = elm.Native || {};
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if (elm.Native.Keyboard) return elm.Native.Keyboard;
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var Signal = Elm.Signal(elm);
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var KR = Elm.Keyboard.Raw(elm);
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var List = Elm.List(elm);
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function keySignal(f) {
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var signal = A2( Signal.lift, f, elm.Keyboard.Raw.keysDown );
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KR.keysDown.defaultNumberOfKids += 1;
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signal.defaultNumberOfKids = 0;
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return signal;
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}
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function dir(up, down, left, right) {
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function f(ks) {
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var x = 0, y = 0;
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while (ks.ctor == "Cons") {
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switch (ks._0) {
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case left : --x; break;
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case right: ++x; break;
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case up : ++y; break;
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case down : --y; break;
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}
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ks = ks._1;
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}
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return { _:{}, x:x, y:y };
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}
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return keySignal(f);
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}
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function is(key) { return keySignal(List.member(key)); }
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return elm.Native.Keyboard = { isDown:is, dir:F4(dir) };
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};
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