45 lines
1.9 KiB
Plaintext
45 lines
1.9 KiB
Plaintext
import { operate } from '../util/lift';
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import { createOperatorSubscriber } from './OperatorSubscriber';
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import { innerFrom } from '../observable/innerFrom';
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export function throttle(durationSelector, config) {
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return operate(function (source, subscriber) {
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var _a = config !== null && config !== void 0 ? config : {}, _b = _a.leading, leading = _b === void 0 ? true : _b, _c = _a.trailing, trailing = _c === void 0 ? false : _c;
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var hasValue = false;
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var sendValue = null;
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var throttled = null;
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var isComplete = false;
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var endThrottling = function () {
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throttled === null || throttled === void 0 ? void 0 : throttled.unsubscribe();
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throttled = null;
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if (trailing) {
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send();
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isComplete && subscriber.complete();
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}
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};
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var cleanupThrottling = function () {
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throttled = null;
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isComplete && subscriber.complete();
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};
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var startThrottle = function (value) {
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return (throttled = innerFrom(durationSelector(value)).subscribe(createOperatorSubscriber(subscriber, endThrottling, cleanupThrottling)));
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};
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var send = function () {
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if (hasValue) {
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hasValue = false;
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var value = sendValue;
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sendValue = null;
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subscriber.next(value);
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!isComplete && startThrottle(value);
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}
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};
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source.subscribe(createOperatorSubscriber(subscriber, function (value) {
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hasValue = true;
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sendValue = value;
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!(throttled && !throttled.closed) && (leading ? send() : startThrottle(value));
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}, function () {
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isComplete = true;
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!(trailing && hasValue && throttled && !throttled.closed) && subscriber.complete();
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}));
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});
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}
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//# sourceMappingURL=throttle.js.map |