64 lines
1.5 KiB
JavaScript
64 lines
1.5 KiB
JavaScript
function E() {
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// Keep this empty so it's easier to inherit from
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// (via https://github.com/lipsmack from https://github.com/scottcorgan/tiny-emitter/issues/3)
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}
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E.prototype = {
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on (name, callback, ctx) {
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let e = this.e || (this.e = {});
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(e[name] || (e[name] = [])).push({
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fn: callback,
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ctx,
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});
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return this;
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},
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once (name, callback, ctx) {
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let self = this;
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function listener() {
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self.off(name, listener);
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callback.apply(ctx, arguments);
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}
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listener._ = callback;
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return this.on(name, listener, ctx);
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},
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emit (name) {
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let data = [].slice.call(arguments, 1);
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let evtArr = ((this.e || (this.e = {}))[name] || []).slice();
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let i = 0;
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let len = evtArr.length;
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for (i; i < len; i++) {
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evtArr[i].fn.apply(evtArr[i].ctx, data);
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}
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return this;
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},
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off (name, callback) {
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let e = this.e || (this.e = {});
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let evts = e[name];
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let liveEvents = [];
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if (evts && callback) {
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for (let i = 0, len = evts.length; i < len; i++) {
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if (evts[i].fn !== callback && evts[i].fn._ !== callback) liveEvents.push(evts[i]);
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}
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}
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// Remove event from queue to prevent memory leak
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// Suggested by https://github.com/lazd
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// Ref: https://github.com/scottcorgan/tiny-emitter/commit/c6ebfaa9bc973b33d110a84a307742b7cf94c953#commitcomment-5024910
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liveEvents.length ? (e[name] = liveEvents) : delete e[name];
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return this;
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},
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};
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export default E;
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