73 lines
1.8 KiB
JavaScript
73 lines
1.8 KiB
JavaScript
function MakeEmitter(obj) {
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obj.__evHandlers = {};
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obj.on = function (ev, fn) {
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if (!(ev in this.__evHandlers)) {
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this.__evHandlers[ev] = [];
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}
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this.__evHandlers[ev].push({
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fn: fn,
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remove: false
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});
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};
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obj.once = function (ev, fn) {
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if (!(ev in this.__evHandlers)) {
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this.__evHandlers[ev] = [];
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}
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this.__evHandlers[ev].push({
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fn: fn,
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remove: true
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});
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};
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obj.emit = function (ev /*, arguments */) {
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var self = this;
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var handlers = self.__evHandlers[ev];
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if (!(handlers instanceof Array)) {
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handlers = [];
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} else {
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handlers = Array.prototype.slice.call(handlers);
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}
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var args = Array.prototype.slice.call(arguments);
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args.shift();
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handlers.forEach(function (handler) {
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setImmediate(function () {
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handler.fn.apply(self, args);
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});
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if (handler.remove) {
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var i = self.__evHandlers[ev].indexOf(handler);
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if (i >= 0) {
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self.__evHandlers[ev].splice(i, 1);
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}
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}
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});
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};
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obj.unbind = function (ev, fn) {
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var self = this;
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if (ev in self.__evHandlers) {
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if (!fn) {
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self.__evHandlers[ev] = [];
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} else {
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var j = -1;
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for (var i = 0; i < self.__evHandlers[ev].length; i++) {
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if (self.__evHandlers[ev][i].fn === fn) {
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j = i;
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break;
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}
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}
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if (j >= 0) {
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self.__evHandlers[ev].splice(j, 1);
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}
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}
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}
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};
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}
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module.exports = MakeEmitter;
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