material-motion/dist/observables/ReactiveProperty.js

Makes it easy to add rich, interactive motion to your application.

/** @license
 *  Copyright 2016 - present The Material Motion Authors. All Rights Reserved.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"); you may not
 *  use this file except in compliance with the License. You may obtain a copy
 *  of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 *  License for the specific language governing permissions and limitations
 *  under the License.
 */
import { IndefiniteSubject, } from './IndefiniteSubject';
/**
 * A Subject that exposes its last value via `read()` and `write(nextValue)`.
 *
 * Writes will be broadcast to all observers.
 */
export class ReactiveProperty extends IndefiniteSubject {
    constructor(readableWritable) {
        super();
        // IndefiniteSubject caches the last emission as `_lastEmission`.
        //
        // If the user supplies `read` and `write` functions, we replace
        // `_subject._lastEmission` with them, so all reads and writes go through
        // the user-supplied getter/setter.
        if (readableWritable) {
            Object.defineProperty(this, '_lastEmission', {
                get: readableWritable.read,
                set: readableWritable.write,
            });
        }
    }
    read() {
        return this._lastEmission;
    }
    write(value) {
        this.next(value);
    }
}
export default ReactiveProperty;
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