| /** PURE_IMPORTS_START .._Observable,.._util_tryCatch,.._util_isFunction,.._util_errorObject,.._Subscription PURE_IMPORTS_END */ |
| var __extends = (this && this.__extends) || function (d, b) { |
| for (var p in b) |
| if (b.hasOwnProperty(p)) |
| d[p] = b[p]; |
| function __() { this.constructor = d; } |
| d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __()); |
| }; |
| import { Observable } from '../Observable'; |
| import { tryCatch } from '../util/tryCatch'; |
| import { isFunction } from '../util/isFunction'; |
| import { errorObject } from '../util/errorObject'; |
| import { Subscription } from '../Subscription'; |
| var toString = Object.prototype.toString; |
| function isNodeStyleEventEmitter(sourceObj) { |
| return !!sourceObj && typeof sourceObj.addListener === 'function' && typeof sourceObj.removeListener === 'function'; |
| } |
| function isJQueryStyleEventEmitter(sourceObj) { |
| return !!sourceObj && typeof sourceObj.on === 'function' && typeof sourceObj.off === 'function'; |
| } |
| function isNodeList(sourceObj) { |
| return !!sourceObj && toString.call(sourceObj) === '[object NodeList]'; |
| } |
| function isHTMLCollection(sourceObj) { |
| return !!sourceObj && toString.call(sourceObj) === '[object HTMLCollection]'; |
| } |
| function isEventTarget(sourceObj) { |
| return !!sourceObj && typeof sourceObj.addEventListener === 'function' && typeof sourceObj.removeEventListener === 'function'; |
| } |
| /** |
| * We need this JSDoc comment for affecting ESDoc. |
| * @extends {Ignored} |
| * @hide true |
| */ |
| export var FromEventObservable = /*@__PURE__*/ (/*@__PURE__*/ function (_super) { |
| __extends(FromEventObservable, _super); |
| function FromEventObservable(sourceObj, eventName, selector, options) { |
| _super.call(this); |
| this.sourceObj = sourceObj; |
| this.eventName = eventName; |
| this.selector = selector; |
| this.options = options; |
| } |
| /* tslint:enable:max-line-length */ |
| /** |
| * Creates an Observable that emits events of a specific type coming from the |
| * given event target. |
| * |
| * <span class="informal">Creates an Observable from DOM events, or Node.js |
| * EventEmitter events or others.</span> |
| * |
| * <img src="./img/fromEvent.png" width="100%"> |
| * |
| * `fromEvent` accepts as a first argument event target, which is an object with methods |
| * for registering event handler functions. As a second argument it takes string that indicates |
| * type of event we want to listen for. `fromEvent` supports selected types of event targets, |
| * which are described in detail below. If your event target does not match any of the ones listed, |
| * you should use {@link fromEventPattern}, which can be used on arbitrary APIs. |
| * When it comes to APIs supported by `fromEvent`, their methods for adding and removing event |
| * handler functions have different names, but they all accept a string describing event type |
| * and function itself, which will be called whenever said event happens. |
| * |
| * Every time resulting Observable is subscribed, event handler function will be registered |
| * to event target on given event type. When that event fires, value |
| * passed as a first argument to registered function will be emitted by output Observable. |
| * When Observable is unsubscribed, function will be unregistered from event target. |
| * |
| * Note that if event target calls registered function with more than one argument, second |
| * and following arguments will not appear in resulting stream. In order to get access to them, |
| * you can pass to `fromEvent` optional project function, which will be called with all arguments |
| * passed to event handler. Output Observable will then emit value returned by project function, |
| * instead of the usual value. |
| * |
| * Remember that event targets listed below are checked via duck typing. It means that |
| * no matter what kind of object you have and no matter what environment you work in, |
| * you can safely use `fromEvent` on that object if it exposes described methods (provided |
| * of course they behave as was described above). So for example if Node.js library exposes |
| * event target which has the same method names as DOM EventTarget, `fromEvent` is still |
| * a good choice. |
| * |
| * If the API you use is more callback then event handler oriented (subscribed |
| * callback function fires only once and thus there is no need to manually |
| * unregister it), you should use {@link bindCallback} or {@link bindNodeCallback} |
| * instead. |
| * |
| * `fromEvent` supports following types of event targets: |
| * |
| * **DOM EventTarget** |
| * |
| * This is an object with `addEventListener` and `removeEventListener` methods. |
| * |
| * In the browser, `addEventListener` accepts - apart from event type string and event |
| * handler function arguments - optional third parameter, which is either an object or boolean, |
| * both used for additional configuration how and when passed function will be called. When |
| * `fromEvent` is used with event target of that type, you can provide this values |
| * as third parameter as well. |
| * |
| * **Node.js EventEmitter** |
| * |
| * An object with `addListener` and `removeListener` methods. |
| * |
| * **JQuery-style event target** |
| * |
| * An object with `on` and `off` methods |
| * |
| * **DOM NodeList** |
| * |
| * List of DOM Nodes, returned for example by `document.querySelectorAll` or `Node.childNodes`. |
| * |
| * Although this collection is not event target in itself, `fromEvent` will iterate over all Nodes |
| * it contains and install event handler function in every of them. When returned Observable |
| * is unsubscribed, function will be removed from all Nodes. |
| * |
| * **DOM HtmlCollection** |
| * |
| * Just as in case of NodeList it is a collection of DOM nodes. Here as well event handler function is |
| * installed and removed in each of elements. |
| * |
| * |
| * @example <caption>Emits clicks happening on the DOM document</caption> |
| * var clicks = Rx.Observable.fromEvent(document, 'click'); |
| * clicks.subscribe(x => console.log(x)); |
| * |
| * // Results in: |
| * // MouseEvent object logged to console every time a click |
| * // occurs on the document. |
| * |
| * |
| * @example <caption>Use addEventListener with capture option</caption> |
| * var clicksInDocument = Rx.Observable.fromEvent(document, 'click', true); // note optional configuration parameter |
| * // which will be passed to addEventListener |
| * var clicksInDiv = Rx.Observable.fromEvent(someDivInDocument, 'click'); |
| * |
| * clicksInDocument.subscribe(() => console.log('document')); |
| * clicksInDiv.subscribe(() => console.log('div')); |
| * |
| * // By default events bubble UP in DOM tree, so normally |
| * // when we would click on div in document |
| * // "div" would be logged first and then "document". |
| * // Since we specified optional `capture` option, document |
| * // will catch event when it goes DOWN DOM tree, so console |
| * // will log "document" and then "div". |
| * |
| * @see {@link bindCallback} |
| * @see {@link bindNodeCallback} |
| * @see {@link fromEventPattern} |
| * |
| * @param {EventTargetLike} target The DOM EventTarget, Node.js |
| * EventEmitter, JQuery-like event target, NodeList or HTMLCollection to attach the event handler to. |
| * @param {string} eventName The event name of interest, being emitted by the |
| * `target`. |
| * @param {EventListenerOptions} [options] Options to pass through to addEventListener |
| * @param {SelectorMethodSignature<T>} [selector] An optional function to |
| * post-process results. It takes the arguments from the event handler and |
| * should return a single value. |
| * @return {Observable<T>} |
| * @static true |
| * @name fromEvent |
| * @owner Observable |
| */ |
| FromEventObservable.create = function (target, eventName, options, selector) { |
| if (isFunction(options)) { |
| selector = options; |
| options = undefined; |
| } |
| return new FromEventObservable(target, eventName, selector, options); |
| }; |
| FromEventObservable.setupSubscription = function (sourceObj, eventName, handler, subscriber, options) { |
| var unsubscribe; |
| if (isNodeList(sourceObj) || isHTMLCollection(sourceObj)) { |
| for (var i = 0, len = sourceObj.length; i < len; i++) { |
| FromEventObservable.setupSubscription(sourceObj[i], eventName, handler, subscriber, options); |
| } |
| } |
| else if (isEventTarget(sourceObj)) { |
| var source_1 = sourceObj; |
| sourceObj.addEventListener(eventName, handler, options); |
| unsubscribe = function () { return source_1.removeEventListener(eventName, handler); }; |
| } |
| else if (isJQueryStyleEventEmitter(sourceObj)) { |
| var source_2 = sourceObj; |
| sourceObj.on(eventName, handler); |
| unsubscribe = function () { return source_2.off(eventName, handler); }; |
| } |
| else if (isNodeStyleEventEmitter(sourceObj)) { |
| var source_3 = sourceObj; |
| sourceObj.addListener(eventName, handler); |
| unsubscribe = function () { return source_3.removeListener(eventName, handler); }; |
| } |
| else { |
| throw new TypeError('Invalid event target'); |
| } |
| subscriber.add(new Subscription(unsubscribe)); |
| }; |
| FromEventObservable.prototype._subscribe = function (subscriber) { |
| var sourceObj = this.sourceObj; |
| var eventName = this.eventName; |
| var options = this.options; |
| var selector = this.selector; |
| var handler = selector ? function () { |
| var args = []; |
| for (var _i = 0; _i < arguments.length; _i++) { |
| args[_i - 0] = arguments[_i]; |
| } |
| var result = tryCatch(selector).apply(void 0, args); |
| if (result === errorObject) { |
| subscriber.error(errorObject.e); |
| } |
| else { |
| subscriber.next(result); |
| } |
| } : function (e) { return subscriber.next(e); }; |
| FromEventObservable.setupSubscription(sourceObj, eventName, handler, subscriber, options); |
| }; |
| return FromEventObservable; |
| }(Observable)); |
| //# sourceMappingURL=FromEventObservable.js.map |