material-motion
Version:
Makes it easy to add rich, interactive motion to your application.
40 lines • 1.53 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.
*/
export function withSlidingWindow(superclass) {
return class extends superclass {
/**
* Emits the last values to be received in an array of the given `size`.
*
* Reuses the same array on each emit, so if you want to compare emissions,
* make a copy of each as you receive it.
*/
_slidingWindow({ size = 2 } = {}) {
return this._nextOperator({
operation({ emit }) {
const result = [];
return ({ upstream }) => {
result.push(upstream);
if (result.length > size) {
result.shift();
}
emit(result);
};
}
});
}
};
}
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