125 lines
3.7 KiB
JavaScript
125 lines
3.7 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 { APP_WILL_MOUNT, APP_WILL_UNMOUNT } from '../../base/app';
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import { MiddlewareRegistry } from '../../base/redux';
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import {
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_setAppStateListener as _setAppStateListenerA,
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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 - The 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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return _setAppStateListenerF(store, next, action);
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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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const { dispatch } = store;
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dispatch(
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_setAppStateListenerA(_onAppStateChange.bind(undefined, dispatch)));
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break;
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}
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case APP_WILL_UNMOUNT:
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store.dispatch(_setAppStateListenerA(undefined));
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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 - The redux {@code 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: Function, 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 - The redux {@code 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<any>, appState: string) {
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dispatch(appStateChanged(appState));
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}
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/**
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* Notifies the feature filmstrip that the action
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* {@link _SET_IMMERSIVE_LISTENER} is being dispatched within a specific redux
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* store.
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*
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* @param {Store} store - The redux store in which the specified action is being
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* dispatched.
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* @param {Dispatch} next - The redux dispatch function to dispatch the
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* specified action to the specified store.
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* @param {Action} action - The redux action {@code _SET_IMMERSIVE_LISTENER}
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* which is being dispatched in the specified store.
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* @private
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* @returns {Object} The value returned by {@code next(action)}.
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*/
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function _setAppStateListenerF({ getState }, next, action) {
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// Remove the old AppState listener and add the new one.
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const { appStateListener: oldListener } = getState()['features/background'];
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const result = next(action);
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const { appStateListener: newListener } = getState()['features/background'];
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if (oldListener !== newListener) {
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oldListener && AppState.removeEventListener('change', oldListener);
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newListener && AppState.addEventListener('change', newListener);
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}
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return result;
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}
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