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31399254b6
Don't have debounced functions take arsg, because they won't be the same for each invocation.
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 invocarion of the function.
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*/
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module.exports = function(f, minIntervalMs) {
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this.lastCall = 0;
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this.scheduledCall = undefined;
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var self = this;
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return function() {
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var now = Date.now();
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if (self.lastCall < now - minIntervalMs) {
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f.apply(this);
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self.lastCall = now;
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} else if (self.scheduledCall === undefined) {
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self.scheduledCall = setTimeout(
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() => {
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self.scheduledCall = undefined;
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f.apply(this);
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self.lastCall = now;
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},
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(self.lastCall + minIntervalMs) - now
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);
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}
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};
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};
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