@angular/material
Version:
Angular Material
69 lines • 9.07 kB
JavaScript
/**
* @license
* Copyright Google LLC 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
*/
import { normalizePassiveListenerOptions, _getEventTarget } from '@angular/cdk/platform';
/** Options used to bind a passive capturing event. */
const passiveCapturingEventOptions = normalizePassiveListenerOptions({
passive: true,
capture: true,
});
/** Manages events through delegation so that as few event handlers as possible are bound. */
export class RippleEventManager {
constructor() {
this._events = new Map();
/** Event handler that is bound and which dispatches the events to the different targets. */
this._delegateEventHandler = (event) => {
const target = _getEventTarget(event);
if (target) {
this._events.get(event.type)?.forEach((handlers, element) => {
if (element === target || element.contains(target)) {
handlers.forEach(handler => handler.handleEvent(event));
}
});
}
};
}
/** Adds an event handler. */
addHandler(ngZone, name, element, handler) {
const handlersForEvent = this._events.get(name);
if (handlersForEvent) {
const handlersForElement = handlersForEvent.get(element);
if (handlersForElement) {
handlersForElement.add(handler);
}
else {
handlersForEvent.set(element, new Set([handler]));
}
}
else {
this._events.set(name, new Map([[element, new Set([handler])]]));
ngZone.runOutsideAngular(() => {
document.addEventListener(name, this._delegateEventHandler, passiveCapturingEventOptions);
});
}
}
/** Removes an event handler. */
removeHandler(name, element, handler) {
const handlersForEvent = this._events.get(name);
if (!handlersForEvent) {
return;
}
const handlersForElement = handlersForEvent.get(element);
if (!handlersForElement) {
return;
}
handlersForElement.delete(handler);
if (handlersForElement.size === 0) {
handlersForEvent.delete(element);
}
if (handlersForEvent.size === 0) {
this._events.delete(name);
document.removeEventListener(name, this._delegateEventHandler, passiveCapturingEventOptions);
}
}
}
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