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DOMEventListenerMap.js
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DOMEventListenerMap.js
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/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow
*/
import type {DOMTopLevelEventType} from 'legacy-events/TopLevelEventTypes';
import {registrationNameDependencies} from 'legacy-events/EventPluginRegistry';
const PossiblyWeakMap = typeof WeakMap === 'function' ? WeakMap : Map;
// prettier-ignore
const elementListenerMap:
// $FlowFixMe Work around Flow bug
| WeakMap
| Map<EventTarget, Map<DOMTopLevelEventType | string, null | (any => void)>> = new PossiblyWeakMap();
export type ElementListenerMap = Map<
DOMTopLevelEventType | string,
null | (any => void),
>;
export function getListenerMapForElement(
target: EventTarget,
): ElementListenerMap {
let listenerMap = elementListenerMap.get(target);
if (listenerMap === undefined) {
listenerMap = new Map();
elementListenerMap.set(target, listenerMap);
}
return listenerMap;
}
export function isListeningToAllDependencies(
registrationName: string,
mountAt: Document | Element,
): boolean {
const listenerMap = getListenerMapForElement(mountAt);
const dependencies = registrationNameDependencies[registrationName];
for (let i = 0; i < dependencies.length; i++) {
const dependency = dependencies[i];
if (!listenerMap.has(dependency)) {
return false;
}
}
return true;
}