87 lines
3.0 KiB
JavaScript
87 lines
3.0 KiB
JavaScript
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function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
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function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
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/**
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* Copyright (c) Nicolas Gallagher.
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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*
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*/
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import { canUseDOM } from 'fbjs/lib/ExecutionEnvironment';
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import findIndex from 'array-find-index';
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import invariant from 'fbjs/lib/invariant'; // Android 4.4 browser
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var isPrefixed = canUseDOM && !document.hasOwnProperty('hidden') && document.hasOwnProperty('webkitHidden');
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var EVENT_TYPES = ['change', 'memoryWarning'];
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var VISIBILITY_CHANGE_EVENT = isPrefixed ? 'webkitvisibilitychange' : 'visibilitychange';
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var VISIBILITY_STATE_PROPERTY = isPrefixed ? 'webkitVisibilityState' : 'visibilityState';
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var AppStates = {
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BACKGROUND: 'background',
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ACTIVE: 'active'
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};
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var listeners = [];
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var AppState =
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/*#__PURE__*/
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function () {
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function AppState() {}
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AppState.addEventListener = function addEventListener(type, handler) {
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if (AppState.isAvailable) {
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invariant(EVENT_TYPES.indexOf(type) !== -1, 'Trying to subscribe to unknown event: "%s"', type);
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if (type === 'change') {
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var callback = function callback() {
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return handler(AppState.currentState);
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};
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listeners.push([handler, callback]);
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document.addEventListener(VISIBILITY_CHANGE_EVENT, callback, false);
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}
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}
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};
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AppState.removeEventListener = function removeEventListener(type, handler) {
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if (AppState.isAvailable) {
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invariant(EVENT_TYPES.indexOf(type) !== -1, 'Trying to remove listener for unknown event: "%s"', type);
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if (type === 'change') {
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var listenerIndex = findIndex(listeners, function (pair) {
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return pair[0] === handler;
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});
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invariant(listenerIndex !== -1, 'Trying to remove AppState listener for unregistered handler');
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var callback = listeners[listenerIndex][1];
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document.removeEventListener(VISIBILITY_CHANGE_EVENT, callback, false);
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listeners.splice(listenerIndex, 1);
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}
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}
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};
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_createClass(AppState, null, [{
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key: "currentState",
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get: function get() {
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if (!AppState.isAvailable) {
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return AppStates.ACTIVE;
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}
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switch (document[VISIBILITY_STATE_PROPERTY]) {
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case 'hidden':
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case 'prerender':
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case 'unloaded':
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return AppStates.BACKGROUND;
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default:
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return AppStates.ACTIVE;
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}
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}
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}]);
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return AppState;
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}();
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AppState.isAvailable = canUseDOM && document[VISIBILITY_STATE_PROPERTY];
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export { AppState as default };
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