68 lines
1.1 KiB
JavaScript
68 lines
1.1 KiB
JavaScript
export default class EventObject {
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constructor() {
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this.listeners = new Map();
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this.forwards = new Set();
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}
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addEventListener(type, callback) {
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const l = this.listeners.get(type);
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if(l) {
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l.push(callback);
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} else {
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this.listeners.set(type, [callback]);
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}
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}
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removeEventListener(type, fn) {
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const l = this.listeners.get(type);
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if(!l) {
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return;
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}
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const i = l.indexOf(fn);
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if(i !== -1) {
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l.splice(i, 1);
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}
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}
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on(type, fn) {
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this.addEventListener(type, fn);
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return this;
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}
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off(type, fn) {
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this.removeEventListener(type, fn);
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return this;
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}
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countEventListeners(type) {
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return (this.listeners.get(type) || []).length;
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}
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removeAllEventListeners(type) {
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if(type) {
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this.listeners.delete(type);
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} else {
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this.listeners.clear();
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}
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}
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addEventForwarding(target) {
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this.forwards.add(target);
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}
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removeEventForwarding(target) {
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this.forwards.delete(target);
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}
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removeAllEventForwardings() {
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this.forwards.clear();
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}
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trigger(type, params = []) {
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(this.listeners.get(type) || []).forEach(
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(listener) => listener(...params)
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);
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this.forwards.forEach((fwd) => fwd.trigger(type, params));
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}
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}
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