95 lines
2.7 KiB
JavaScript
95 lines
2.7 KiB
JavaScript
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"use strict";
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var Class = require("./class");
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var Subscribable = Class.inherit({
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"className": "Subscribable",
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"constructor": function() {
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Class.fn.constructor.call(this);
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this._events = Object.create(null);
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},
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"destructor": function() {
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this.off();
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Class.fn.destructor.call(this);
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},
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"on": function(name, handler, context) {
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var handlers = this._events[name];
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if (typeof name !== "string") {
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throw new Error("Name of event is mandatory");
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}
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if (!(handler instanceof Function)) {
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throw new Error("Handler of event is mandatory");
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}
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if (!handlers) {
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handlers = [];
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this._events[name] = handlers;
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}
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handlers.push({
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handler: handler,
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context: context || this,
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once: false
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});
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},
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"one": function(name) {
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Subscribable.fn.on.apply(this, arguments);
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this._events[name][this._events[name].length - 1].once = true;
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},
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"off": function(name, handler, context) {
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if (typeof name === "string") {
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if (this._events[name]) {
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if (handler instanceof Function) {
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var handlers = this._events[name];
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for (var i = handlers.length - 1; i >= 0 ; --i) {
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if (handlers[i].handler === handler) {
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if (context) {
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if (handlers[i].context === context) {
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handlers.splice(i, 1);
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}
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} else {
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handlers.splice(i, 1);
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}
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}
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}
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} else {
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delete this._events[name];
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}
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}
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} else {
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this._events = Object.create(null);
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}
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},
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"trigger": function() {
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var args = [].slice.call(arguments);
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if (args.length === 0) {
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throw new Error("Name of event is mandatory");
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}
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var answer = false;
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var name = args.shift();
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var handlers = this._events[name];
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if (handlers) {
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for (var i = 0; i < handlers.length; ++i) {
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var handle = handlers[i];
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answer = handle.handler.apply(handle.context, args);
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if (handle.once) {
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handlers.splice(i, 1);
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--i;
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}
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if (answer === false) {
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return false;
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}
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}
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}
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return answer;
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}
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});
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module.exports = Subscribable;
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