42 lines
860 B
JavaScript
42 lines
860 B
JavaScript
/**
|
|
* Copyright (c) Facebook, Inc. and its affiliates.
|
|
*
|
|
* This source code is licensed under the MIT license found in the
|
|
* LICENSE file in the root directory of this source tree.
|
|
*
|
|
* @format
|
|
* @flow strict
|
|
*/
|
|
|
|
'use strict';
|
|
|
|
type Scene = {name: string};
|
|
|
|
let _listeners: Array<(scene: Scene) => void> = [];
|
|
|
|
let _activeScene = {name: 'default'};
|
|
|
|
const SceneTracker = {
|
|
setActiveScene(scene: Scene) {
|
|
_activeScene = scene;
|
|
_listeners.forEach(listener => listener(_activeScene));
|
|
},
|
|
|
|
getActiveScene(): Scene {
|
|
return _activeScene;
|
|
},
|
|
|
|
addActiveSceneChangedListener(
|
|
callback: (scene: Scene) => void,
|
|
): {remove: () => void} {
|
|
_listeners.push(callback);
|
|
return {
|
|
remove: () => {
|
|
_listeners = _listeners.filter(listener => callback !== listener);
|
|
},
|
|
};
|
|
},
|
|
};
|
|
|
|
module.exports = SceneTracker;
|