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/** |
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* Utility class to handle with events (subscribe, notify etc) |
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* |
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* @class EventManager |
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*/ |
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class EventManager { |
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constructor() { |
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this._map = {}; |
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} |
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/** |
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* Add an event listener |
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* |
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* @param {String} eventName |
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* @param {Function} fn |
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* @returns {Function} the "unsubscriber". Call this function to unsubscribe this event (or use the unsubscribe method) |
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* |
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* @memberOf EventManager |
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*/ |
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subscribe(eventName, fn) { |
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if (typeof eventName !== "string") { |
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throw "eventName must be string"; |
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} |
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if (!eventName.length) { |
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throw "eventName cannot be empty"; |
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} |
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if (!this._map.hasOwnProperty(eventName)) { |
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this._map[eventName] = []; |
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} |
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this._map[eventName].push(fn); |
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return this.unsubscribe.bind(this, eventName, fn); |
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} |
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/** |
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* @see subscribe |
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* Add an event listener to multiple event aht the sabe time |
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* |
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* @param {any} eventNames |
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* @param {any} fn |
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* |
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* @memberOf EventManager |
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*/ |
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subscribeMultiple(eventNames, fn) { |
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let i, length = eventNames.length; |
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var unsubscribes = []; |
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for (i = 0; i < length; i++) { |
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unsubscribes.push(this.subscribe(eventNames[i], fn)); |
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} |
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return () => { |
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unsubscribes.map(unsubscribe => unsubscribe()); |
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} |
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} |
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/** |
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* Removes an event listener from an event |
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* |
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* @param {string} eventName |
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* @param {Function} fn |
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* @returns |
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* |
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* @memberOf EventManager |
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*/ |
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unsubscribe(eventName, fn) { |
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if (!this._map[eventName]) { |
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return; |
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} |
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let index = this._map[eventName].indexOf(fn); |
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if (index !== -1) { |
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this._map[eventName].splice(index, 1); |
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} |
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} |
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/** |
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* @see unsubscribe |
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* Removes the event listener from multiple events |
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* |
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* @param {string} eventNames |
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* @param {Function} fn |
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* |
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* @memberOf EventManager |
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*/ |
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unsubscribeMultiple(eventNames, fn) { |
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let i, length = eventNames.length; |
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for (i = 0; i < length; i++) { |
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this.unsubscribe(eventNames[i], fn); |
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} |
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} |
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/** |
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* Removes all event listeners from the given events |
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* |
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* @param {String[]} eventNames |
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* |
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* @memberOf EventManager |
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*/ |
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unsubscribeAll(eventNames) { |
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let i, length = eventNames.length; |
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for (i = 0; i < length; i++) { |
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if (this._map.hasOwnProperty(eventNames[i])) { |
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delete this._map(eventNames[i]); |
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} |
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} |
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} |
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/** |
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* Fire an event. Will send all arguments afeter eventName to the existent |
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* event listeners |
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* |
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* @param {String} eventName |
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* @returns |
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* |
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* @memberOf EventManager |
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*/ |
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notify(eventName) { |
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if (!this._map.hasOwnProperty(eventName)) { |
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return; |
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} |
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// make an copy of the arguments to prevent someone to change it |
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let args = Array.prototype.slice.call(arguments, 1); |
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this._map[eventName].forEach(function (fn) { |
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fn.apply(this, args); |
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}); |
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} |
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} |
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export default EventManager; |
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beeblebrox3 /
star
