mirror of
https://github.com/tenrok/OverlayScrollbars.git
synced 2026-06-01 12:14:07 +03:00
Rene Haas
80 lines
3.2 KiB
JavaScript
80 lines
3.2 KiB
JavaScript
import { isUndefined } from '../utils/types';
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import { each, push, runEachAndClear } from '../utils/array';
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let passiveEventsSupport;
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const supportPassiveEvents = () => {
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if (isUndefined(passiveEventsSupport)) {
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passiveEventsSupport = false;
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try {
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/* eslint-disable */
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// @ts-ignore
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window.addEventListener('test', null, Object.defineProperty({}, 'passive', {
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get() {
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passiveEventsSupport = true;
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},
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}));
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/* eslint-enable */
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}
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catch (e) { }
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}
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return passiveEventsSupport;
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};
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const splitEventNames = (eventNames) => eventNames.split(' ');
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/**
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* Removes the passed event listener for the passed events with the passed options.
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* @param target The element from which the listener shall be removed.
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* @param eventNames The eventsnames for which the listener shall be removed.
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* @param listener The listener which shall be removed.
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* @param capture The options of the removed listener.
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*/
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export const off = (target, eventNames, listener, capture) => {
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each(splitEventNames(eventNames), (eventName) => {
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target.removeEventListener(eventName, listener, capture);
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});
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};
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/**
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* Adds the passed event listener for the passed eventnames with the passed options.
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* @param target The element to which the listener shall be added.
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* @param eventNames The eventsnames for which the listener shall be called.
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* @param listener The listener which is called on the eventnames.
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* @param options The options of the added listener.
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*/
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export const on = (target, eventNames, listener, options) => {
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const doSupportPassiveEvents = supportPassiveEvents();
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const passive = (doSupportPassiveEvents && options && options._passive) ?? doSupportPassiveEvents;
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const capture = (options && options._capture) || false;
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const once = (options && options._once) || false;
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const offListeners = [];
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const nativeOptions = doSupportPassiveEvents
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? {
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passive,
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capture,
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}
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: capture;
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each(splitEventNames(eventNames), (eventName) => {
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const finalListener = (once
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? (evt) => {
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target.removeEventListener(eventName, finalListener, capture);
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listener && listener(evt);
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}
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: listener);
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push(offListeners, off.bind(null, target, eventName, finalListener, capture));
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target.addEventListener(eventName, finalListener, nativeOptions);
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});
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return runEachAndClear.bind(0, offListeners);
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};
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/**
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* Shorthand for the stopPropagation event Method.
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* @param evt The event of which the stopPropagation method shall be called.
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*/
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export const stopPropagation = (evt) => evt.stopPropagation();
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/**
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* Shorthand for the preventDefault event Method.
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* @param evt The event of which the preventDefault method shall be called.
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*/
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export const preventDefault = (evt) => evt.preventDefault();
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/**
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* Shorthand for the stopPropagation and preventDefault event Method.
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* @param evt The event of which the stopPropagation and preventDefault methods shall be called.
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*/
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export const stopAndPrevent = (evt) => stopPropagation(evt) || preventDefault(evt);
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//# sourceMappingURL=events.js.map
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