react-native-ui-lib
Version:
[](https://stand-with-ukraine.pp.ua)
33 lines • 962 B
JavaScript
import _indexOf from "lodash/indexOf";
export default class EventEmitterManager {
handlerCallbacks = {};
constructor() {
this.handlerCallbacks = {};
}
listenOn(eventName, handlerCallback) {
if (!this.handlerCallbacks[eventName]) {
this.handlerCallbacks[eventName] = [];
}
if (_indexOf(this.handlerCallbacks[eventName], handlerCallback) === -1) {
this.handlerCallbacks[eventName].push(handlerCallback);
}
}
emitEvent(eventName, params = {}) {
if (this.handlerCallbacks[eventName]) {
this.handlerCallbacks[eventName].forEach(callback => callback(params));
}
}
removeListeners(eventName) {
delete this.handlerCallbacks[eventName];
}
removeListener(eventName, listener) {
const handlers = this.handlerCallbacks[eventName];
if (handlers) {
handlers.forEach((handler, index) => {
if (handler === listener) {
handlers.splice(index, 1);
}
});
}
}
}