110 lines
2.9 KiB
JavaScript
110 lines
2.9 KiB
JavaScript
/* @flow */
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import { AppState } from 'react-native';
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import type { Dispatch } from 'redux';
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import {
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APP_WILL_MOUNT,
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APP_WILL_UNMOUNT
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} from '../app';
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import { MiddlewareRegistry } from '../base/redux';
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import {
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_setAppStateListener,
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_setBackgroundVideoMuted,
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appStateChanged
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} from './actions';
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import {
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_SET_APP_STATE_LISTENER,
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APP_STATE_CHANGED
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} from './actionTypes';
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/**
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* Middleware that captures App lifetime actions and subscribes to application
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* state changes. When the application state changes it will fire the action
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* required to mute or unmute the local video in case the application goes to
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* the background or comes back from it.
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*
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* @param {Store} store - Redux store.
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* @returns {Function}
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* @see {@link https://facebook.github.io/react-native/docs/appstate.html}
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*/
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MiddlewareRegistry.register(store => next => action => {
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switch (action.type) {
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case _SET_APP_STATE_LISTENER: {
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// Remove the current/old AppState listener.
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const { appStateListener } = store.getState()['features/background'];
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if (appStateListener) {
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AppState.removeEventListener('change', appStateListener);
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}
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// Add the new AppState listener.
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if (action.listener) {
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AppState.addEventListener('change', action.listener);
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}
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break;
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}
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case APP_STATE_CHANGED:
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_appStateChanged(store.dispatch, action.appState);
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break;
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case APP_WILL_MOUNT:
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store.dispatch(
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_setAppStateListener(
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_onAppStateChange.bind(undefined, store.dispatch)));
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break;
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case APP_WILL_UNMOUNT:
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store.dispatch(_setAppStateListener(null));
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break;
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}
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return next(action);
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});
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/**
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* Handles app state changes. Dispatches the necessary Redux actions for the
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* local video to be muted when the app goes to the background, and to be
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* unmuted when the app comes back.
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*
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* @param {Dispatch} dispatch - Redux dispatch function.
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* @param {string} appState - The current app state.
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* @private
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* @returns {void}
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*/
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function _appStateChanged(dispatch: Dispatch<*>, appState: string) {
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let muted;
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switch (appState) {
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case 'active':
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muted = false;
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break;
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case 'background':
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muted = true;
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break;
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case 'inactive':
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default:
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// XXX: We purposely don't handle the 'inactive' app state.
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return;
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}
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dispatch(_setBackgroundVideoMuted(muted));
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}
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/**
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* Called by React Native's AppState API to notify that the application state
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* has changed. Dispatches the change within the (associated) Redux store.
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*
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* @param {Dispatch} dispatch - Redux dispatch function.
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* @param {string} appState - The current application execution state.
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* @private
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* @returns {void}
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*/
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function _onAppStateChange(dispatch: Dispatch<*>, appState: string) {
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dispatch(appStateChanged(appState));
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}
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