material-motion
Version:
Makes it easy to add rich, interactive motion to your application.
35 lines • 1.46 kB
JavaScript
/** @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 { MotionObservable, } from '../observables/proxies';
import { isDefined, } from '../typeGuards';
export function withStartWith(superclass) {
return class extends superclass {
startWith({ value }) {
const hasValue = isDefined(value);
// Only destructure if the supplied argument has the correct number of
// members.
if (!hasValue || (hasValue && Object.keys(arguments[0]).length > 1)) {
value = arguments[0];
}
return new MotionObservable((observer) => {
observer.next(value);
const subscription = this.subscribe(observer);
return subscription.unsubscribe;
})._remember();
}
};
}
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