62 lines
2.0 KiB
JavaScript
62 lines
2.0 KiB
JavaScript
/**
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* @flow
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*/
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import { NativeEventEmitter } from 'react-native';
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import EventEmitter from './emitter/EventEmitter';
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import { getRawNativeModule } from './native';
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import type ModuleBase from './ModuleBase';
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const NATIVE_EMITTERS: { [string]: NativeEventEmitter } = {};
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const NATIVE_SUBSCRIPTIONS: { [string]: boolean } = {};
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export const SharedEventEmitter = new EventEmitter();
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export const getAppEventName = (module: ModuleBase, eventName: string): string => {
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return `${module._firebaseApp._name}-${eventName}`;
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};
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const getNativeEmitter = (module: ModuleBase): NativeEventEmitter => {
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const name = `${module._appName}-${module._module}`;
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const nativeModule = getRawNativeModule(module);
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if (!NATIVE_EMITTERS[name]) {
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NATIVE_EMITTERS[name] = new NativeEventEmitter(nativeModule);
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}
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return NATIVE_EMITTERS[name];
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};
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/**
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* Subscribe to a native event for js side distribution by appName
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* React Native events are hard set at compile - cant do dynamic event names
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* so we use a single event send it to js and js then internally can prefix it
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* and distribute dynamically.
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*
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* @param module
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* @param eventName
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* @private
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*/
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const subscribeToNativeModuleEvents = (module: ModuleBase, eventName: string): void => {
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if (!NATIVE_SUBSCRIPTIONS[eventName]) {
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const nativeEmitter = getNativeEmitter(module);
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nativeEmitter.addListener(eventName, (event) => {
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if (event.appName) {
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// native event has an appName property - auto prefix and internally emit
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SharedEventEmitter.emit(`${event.appName}-${eventName}`, event);
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} else {
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// standard event - no need to prefix
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SharedEventEmitter.emit(eventName, event);
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}
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});
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NATIVE_SUBSCRIPTIONS[eventName] = true;
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}
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};
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export const initialiseNativeModuleEventEmitter = (module: ModuleBase, events: string[]): void => {
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if (events && events.length) {
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for (let i = 0, len = events.length; i < len; i++) {
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subscribeToNativeModuleEvents(module, events[i]);
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}
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}
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};
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