52 lines
2.2 KiB
JavaScript
52 lines
2.2 KiB
JavaScript
import { innerFrom } from '../observable/innerFrom';
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import { Observable } from '../Observable';
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import { mergeMap } from '../operators/mergeMap';
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import { isArrayLike } from '../util/isArrayLike';
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import { isFunction } from '../util/isFunction';
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import { mapOneOrManyArgs } from '../util/mapOneOrManyArgs';
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const nodeEventEmitterMethods = ['addListener', 'removeListener'];
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const eventTargetMethods = ['addEventListener', 'removeEventListener'];
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const jqueryMethods = ['on', 'off'];
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export function fromEvent(target, eventName, options, resultSelector) {
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if (isFunction(options)) {
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resultSelector = options;
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options = undefined;
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}
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if (resultSelector) {
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return fromEvent(target, eventName, options).pipe(mapOneOrManyArgs(resultSelector));
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}
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const [add, remove] = isEventTarget(target)
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? eventTargetMethods.map((methodName) => (handler) => target[methodName](eventName, handler, options))
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:
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isNodeStyleEventEmitter(target)
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? nodeEventEmitterMethods.map(toCommonHandlerRegistry(target, eventName))
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: isJQueryStyleEventEmitter(target)
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? jqueryMethods.map(toCommonHandlerRegistry(target, eventName))
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: [];
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if (!add) {
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if (isArrayLike(target)) {
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return mergeMap((subTarget) => fromEvent(subTarget, eventName, options))(innerFrom(target));
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}
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}
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if (!add) {
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throw new TypeError('Invalid event target');
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}
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return new Observable((subscriber) => {
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const handler = (...args) => subscriber.next(1 < args.length ? args : args[0]);
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add(handler);
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return () => remove(handler);
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});
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}
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function toCommonHandlerRegistry(target, eventName) {
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return (methodName) => (handler) => target[methodName](eventName, handler);
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}
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function isNodeStyleEventEmitter(target) {
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return isFunction(target.addListener) && isFunction(target.removeListener);
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}
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function isJQueryStyleEventEmitter(target) {
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return isFunction(target.on) && isFunction(target.off);
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}
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function isEventTarget(target) {
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return isFunction(target.addEventListener) && isFunction(target.removeEventListener);
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}
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//# sourceMappingURL=fromEvent.js.map
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