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34 lines
664 B
JavaScript
34 lines
664 B
JavaScript
class EventDispatcher {
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constructor() {
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this.listeners_ = [];
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}
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dispatch(eventName, event = null) {
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if (!this.listeners_[eventName]) return;
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const ls = this.listeners_[eventName];
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for (let i = 0; i < ls.length; i++) {
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ls[i](event);
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}
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}
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on(eventName, callback) {
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if (!this.listeners_[eventName]) this.listeners_[eventName] = [];
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this.listeners_[eventName].push(callback);
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}
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off(eventName, callback) {
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if (!this.listeners_[eventName]) return;
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const ls = this.listeners_[eventName];
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for (let i = 0; i < ls.length; i++) {
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if (ls[i] === callback) {
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ls.splice(i, 1);
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return;
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}
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}
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}
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}
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module.exports = EventDispatcher;
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