mirror of https://github.com/vector-im/riot-web
48 lines
1.5 KiB
JavaScript
48 lines
1.5 KiB
JavaScript
/*
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Copyright 2016 OpenMarket Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* 'debounces' a function to only execute every n milliseconds.
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* Useful when react-sdk gets many, many events but only wants
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* to update the interface once for all of them.
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*
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* Note that the function must not take arguments, since the args
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* could be different for each invocation of the function.
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*
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* The returned function has a 'cancelPendingCall' property which can be called
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* on unmount or similar to cancel any pending update.
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*/
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import {throttle} from "lodash";
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export default function ratelimitedfunc(fn, time) {
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const throttledFn = throttle(fn, time, {
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leading: true,
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trailing: true,
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});
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const _bind = throttledFn.bind;
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throttledFn.bind = function() {
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const boundFn = _bind.apply(throttledFn, arguments);
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boundFn.cancelPendingCall = throttledFn.cancelPendingCall;
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return boundFn;
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};
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throttledFn.cancelPendingCall = function() {
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throttledFn.cancel();
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};
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return throttledFn;
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}
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