62 lines
2.4 KiB
JavaScript
62 lines
2.4 KiB
JavaScript
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import { Observable } from '../Observable';
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import { isArray } from '../util/isArray';
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import { isFunction } from '../util/isFunction';
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import { map } from '../operators/map';
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const toString = Object.prototype.toString;
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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(map(args => isArray(args) ? resultSelector(...args) : resultSelector(args)));
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}
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return new Observable(subscriber => {
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function handler(e) {
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if (arguments.length > 1) {
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subscriber.next(Array.prototype.slice.call(arguments));
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}
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else {
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subscriber.next(e);
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}
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}
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setupSubscription(target, eventName, handler, subscriber, options);
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});
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}
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function setupSubscription(sourceObj, eventName, handler, subscriber, options) {
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let unsubscribe;
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if (isEventTarget(sourceObj)) {
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const source = sourceObj;
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sourceObj.addEventListener(eventName, handler, options);
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unsubscribe = () => source.removeEventListener(eventName, handler, options);
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}
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else if (isJQueryStyleEventEmitter(sourceObj)) {
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const source = sourceObj;
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sourceObj.on(eventName, handler);
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unsubscribe = () => source.off(eventName, handler);
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}
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else if (isNodeStyleEventEmitter(sourceObj)) {
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const source = sourceObj;
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sourceObj.addListener(eventName, handler);
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unsubscribe = () => source.removeListener(eventName, handler);
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}
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else if (sourceObj && sourceObj.length) {
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for (let i = 0, len = sourceObj.length; i < len; i++) {
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setupSubscription(sourceObj[i], eventName, handler, subscriber, options);
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}
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}
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else {
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throw new TypeError('Invalid event target');
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}
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subscriber.add(unsubscribe);
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}
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function isNodeStyleEventEmitter(sourceObj) {
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return sourceObj && typeof sourceObj.addListener === 'function' && typeof sourceObj.removeListener === 'function';
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}
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function isJQueryStyleEventEmitter(sourceObj) {
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return sourceObj && typeof sourceObj.on === 'function' && typeof sourceObj.off === 'function';
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}
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function isEventTarget(sourceObj) {
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return sourceObj && typeof sourceObj.addEventListener === 'function' && typeof sourceObj.removeEventListener === 'function';
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}
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//# sourceMappingURL=fromEvent.js.map
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