angular-cn/packages/zone.js/lib/browser/event-target.ts

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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
export function eventTargetPatch(_global: any, api: _ZonePrivate) {
if ((Zone as any)[api.symbol('patchEventTarget')]) {
// EventTarget is already patched.
return;
}
const {eventNames, zoneSymbolEventNames, TRUE_STR, FALSE_STR, ZONE_SYMBOL_PREFIX} =
api.getGlobalObjects()!;
// predefine all __zone_symbol__ + eventName + true/false string
for (let i = 0; i < eventNames.length; i++) {
const eventName = eventNames[i];
const falseEventName = eventName + FALSE_STR;
const trueEventName = eventName + TRUE_STR;
const symbol = ZONE_SYMBOL_PREFIX + falseEventName;
const symbolCapture = ZONE_SYMBOL_PREFIX + trueEventName;
zoneSymbolEventNames[eventName] = {};
zoneSymbolEventNames[eventName][FALSE_STR] = symbol;
zoneSymbolEventNames[eventName][TRUE_STR] = symbolCapture;
}
const EVENT_TARGET = _global['EventTarget'];
if (!EVENT_TARGET || !EVENT_TARGET.prototype) {
return;
}
api.patchEventTarget(_global, [EVENT_TARGET && EVENT_TARGET.prototype]);
return true;
}
export function patchEvent(global: any, api: _ZonePrivate) {
api.patchEventPrototype(global, api);
}