40 lines
863 B
JavaScript
40 lines
863 B
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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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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* @providesModule SceneTracker
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* @flow
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*/
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'use strict';
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type Scene = {name: string};
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let _listeners: Array<(scene: Scene) => void> = [];
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let _activeScene = {name: 'default'};
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const SceneTracker = {
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setActiveScene(scene: Scene) {
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_activeScene = scene;
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_listeners.forEach((listener) => listener(_activeScene));
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},
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getActiveScene(): Scene {
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return _activeScene;
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},
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addActiveSceneChangedListener(callback: (scene: Scene) => void): {remove: () => void} {
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_listeners.push(callback);
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return {
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remove: () => {
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_listeners = _listeners.filter((listener) => callback !== listener);
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},
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};
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},
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};
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module.exports = SceneTracker;
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