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node_modules/rxjs/_esm2015/observable/TimerObservable.js

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+import { isNumeric } from '../util/isNumeric';
+import { Observable } from '../Observable';
+import { async } from '../scheduler/async';
+import { isScheduler } from '../util/isScheduler';
+import { isDate } from '../util/isDate';
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @extends {Ignored}
+ * @hide true
+ */
+export class TimerObservable extends Observable {
+    constructor(dueTime = 0, period, scheduler) {
+        super();
+        this.period = -1;
+        this.dueTime = 0;
+        if (isNumeric(period)) {
+            this.period = Number(period) < 1 && 1 || Number(period);
+        }
+        else if (isScheduler(period)) {
+            scheduler = period;
+        }
+        if (!isScheduler(scheduler)) {
+            scheduler = async;
+        }
+        this.scheduler = scheduler;
+        this.dueTime = isDate(dueTime) ?
+            (+dueTime - this.scheduler.now()) :
+            dueTime;
+    }
+    /**
+     * Creates an Observable that starts emitting after an `initialDelay` and
+     * emits ever increasing numbers after each `period` of time thereafter.
+     *
+     * <span class="informal">Its like {@link interval}, but you can specify when
+     * should the emissions start.</span>
+     *
+     * <img src="./img/timer.png" width="100%">
+     *
+     * `timer` returns an Observable that emits an infinite sequence of ascending
+     * integers, with a constant interval of time, `period` of your choosing
+     * between those emissions. The first emission happens after the specified
+     * `initialDelay`. The initial delay may be a {@link Date}. By default, this
+     * operator uses the `async` IScheduler to provide a notion of time, but you
+     * may pass any IScheduler to it. If `period` is not specified, the output
+     * Observable emits only one value, `0`. Otherwise, it emits an infinite
+     * sequence.
+     *
+     * @example <caption>Emits ascending numbers, one every second (1000ms), starting after 3 seconds</caption>
+     * var numbers = Rx.Observable.timer(3000, 1000);
+     * numbers.subscribe(x => console.log(x));
+     *
+     * @example <caption>Emits one number after five seconds</caption>
+     * var numbers = Rx.Observable.timer(5000);
+     * numbers.subscribe(x => console.log(x));
+     *
+     * @see {@link interval}
+     * @see {@link delay}
+     *
+     * @param {number|Date} initialDelay The initial delay time to wait before
+     * emitting the first value of `0`.
+     * @param {number} [period] The period of time between emissions of the
+     * subsequent numbers.
+     * @param {Scheduler} [scheduler=async] The IScheduler to use for scheduling
+     * the emission of values, and providing a notion of "time".
+     * @return {Observable} An Observable that emits a `0` after the
+     * `initialDelay` and ever increasing numbers after each `period` of time
+     * thereafter.
+     * @static true
+     * @name timer
+     * @owner Observable
+     */
+    static create(initialDelay = 0, period, scheduler) {
+        return new TimerObservable(initialDelay, period, scheduler);
+    }
+    static dispatch(state) {
+        const { index, period, subscriber } = state;
+        const action = this;
+        subscriber.next(index);
+        if (subscriber.closed) {
+            return;
+        }
+        else if (period === -1) {
+            return subscriber.complete();
+        }
+        state.index = index + 1;
+        action.schedule(state, period);
+    }
+    /** @deprecated internal use only */ _subscribe(subscriber) {
+        const index = 0;
+        const { period, dueTime, scheduler } = this;
+        return scheduler.schedule(TimerObservable.dispatch, dueTime, {
+            index, period, subscriber
+        });
+    }
+}
+//# sourceMappingURL=TimerObservable.js.map