material-motion
Version:
Makes it easy to add rich, interactive motion to your application.
44 lines • 1.73 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 withReactiveMap(superclass) {
return class extends superclass {
/**
* Whenever the upstream value or an argument's value changes,
* `_reactiveMap` calls `transform` and synchronously passes the result to
* the observer.
*
* If the `onlyEmitWithUpstream` option is set, `transform` is only
* called when the upstream value changes.
*/
_reactiveMap({ transform, inputs, onlyEmitWithUpstream = false }) {
let upstreamChanged = false;
return this._tap({
sideEffect() {
upstreamChanged = true;
},
})._reactiveNextOperator({
operation: ({ emit }) => (values) => {
if (upstreamChanged || !onlyEmitWithUpstream) {
emit(transform(values));
}
upstreamChanged = false;
},
inputs
});
}
};
}
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