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registerEventScrollThrottled.ts
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registerEventScrollThrottled.ts
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/*
* Copyright 2019 LABOR.digital
*
* 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.
*
* Last modified: 2019.02.13 at 17:42
*/
import {isBrowser} from '../../Environment/isBrowser';
import {throttleEvent} from '../../Ui/throttleEvent';
import {EventBus} from '../EventBus';
import {HelferleinEventList} from '../HelferleinEventList';
let isRegistered = false;
/**
* Registers the "EVENT_SCROLL_THROTTLED" event which is called every time
* the window is scrolled, but which has a debounce rate of 150ms
*/
export function registerEventScrollThrottled(): void
{
if (!isBrowser() || isRegistered) {
return;
}
isRegistered = true;
window.addEventListener('scroll', throttleEvent((e: any) => {
EventBus.emit(HelferleinEventList.EVENT_SCROLL_THROTTLED, {parent: e});
}, 50));
}