timing-provider
Version:
An implementation of the timing provider specification.
28 lines • 1.32 kB
JavaScript
export const createEventTargetConstructor = (createEventTarget, wrapEventListener) => {
return class EventTarget {
constructor() {
this._listeners = new WeakMap();
this._nativeEventTarget = createEventTarget();
}
addEventListener(type, listener, options) {
if (listener !== null) {
let wrappedEventListener = this._listeners.get(listener);
if (wrappedEventListener === undefined) {
wrappedEventListener = wrapEventListener(this, listener);
if (typeof listener === 'function') {
this._listeners.set(listener, wrappedEventListener);
}
}
this._nativeEventTarget.addEventListener(type, wrappedEventListener, options);
}
}
dispatchEvent(event) {
return this._nativeEventTarget.dispatchEvent(event);
}
removeEventListener(type, listener, options) {
const wrappedEventListener = listener === null ? undefined : this._listeners.get(listener);
this._nativeEventTarget.removeEventListener(type, wrappedEventListener === undefined ? null : wrappedEventListener, options);
}
};
};
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