| 1 | /** PURE_IMPORTS_START tslib,_innerSubscribe PURE_IMPORTS_END */
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| 2 | import * as tslib_1 from "tslib";
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| 3 | import { SimpleOuterSubscriber, innerSubscribe, SimpleInnerSubscriber } from '../innerSubscribe';
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| 4 | export var defaultThrottleConfig = {
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| 5 | leading: true,
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| 6 | trailing: false
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| 7 | };
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| 8 | export function throttle(durationSelector, config) {
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| 9 | if (config === void 0) {
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| 10 | config = defaultThrottleConfig;
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| 11 | }
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| 12 | return function (source) { return source.lift(new ThrottleOperator(durationSelector, !!config.leading, !!config.trailing)); };
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| 13 | }
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| 14 | var ThrottleOperator = /*@__PURE__*/ (function () {
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| 15 | function ThrottleOperator(durationSelector, leading, trailing) {
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| 16 | this.durationSelector = durationSelector;
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| 17 | this.leading = leading;
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| 18 | this.trailing = trailing;
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| 19 | }
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| 20 | ThrottleOperator.prototype.call = function (subscriber, source) {
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| 21 | return source.subscribe(new ThrottleSubscriber(subscriber, this.durationSelector, this.leading, this.trailing));
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| 22 | };
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| 23 | return ThrottleOperator;
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| 24 | }());
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| 25 | var ThrottleSubscriber = /*@__PURE__*/ (function (_super) {
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| 26 | tslib_1.__extends(ThrottleSubscriber, _super);
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| 27 | function ThrottleSubscriber(destination, durationSelector, _leading, _trailing) {
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| 28 | var _this = _super.call(this, destination) || this;
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| 29 | _this.destination = destination;
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| 30 | _this.durationSelector = durationSelector;
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| 31 | _this._leading = _leading;
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| 32 | _this._trailing = _trailing;
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| 33 | _this._hasValue = false;
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| 34 | return _this;
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| 35 | }
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| 36 | ThrottleSubscriber.prototype._next = function (value) {
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| 37 | this._hasValue = true;
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| 38 | this._sendValue = value;
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| 39 | if (!this._throttled) {
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| 40 | if (this._leading) {
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| 41 | this.send();
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| 42 | }
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| 43 | else {
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| 44 | this.throttle(value);
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| 45 | }
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| 46 | }
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| 47 | };
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| 48 | ThrottleSubscriber.prototype.send = function () {
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| 49 | var _a = this, _hasValue = _a._hasValue, _sendValue = _a._sendValue;
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| 50 | if (_hasValue) {
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| 51 | this.destination.next(_sendValue);
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| 52 | this.throttle(_sendValue);
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| 53 | }
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| 54 | this._hasValue = false;
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| 55 | this._sendValue = undefined;
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| 56 | };
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| 57 | ThrottleSubscriber.prototype.throttle = function (value) {
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| 58 | var duration = this.tryDurationSelector(value);
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| 59 | if (!!duration) {
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| 60 | this.add(this._throttled = innerSubscribe(duration, new SimpleInnerSubscriber(this)));
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| 61 | }
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| 62 | };
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| 63 | ThrottleSubscriber.prototype.tryDurationSelector = function (value) {
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| 64 | try {
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| 65 | return this.durationSelector(value);
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| 66 | }
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| 67 | catch (err) {
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| 68 | this.destination.error(err);
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| 69 | return null;
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| 70 | }
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| 71 | };
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| 72 | ThrottleSubscriber.prototype.throttlingDone = function () {
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| 73 | var _a = this, _throttled = _a._throttled, _trailing = _a._trailing;
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| 74 | if (_throttled) {
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| 75 | _throttled.unsubscribe();
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| 76 | }
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| 77 | this._throttled = undefined;
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| 78 | if (_trailing) {
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| 79 | this.send();
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| 80 | }
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| 81 | };
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| 82 | ThrottleSubscriber.prototype.notifyNext = function () {
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| 83 | this.throttlingDone();
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| 84 | };
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| 85 | ThrottleSubscriber.prototype.notifyComplete = function () {
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| 86 | this.throttlingDone();
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| 87 | };
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| 88 | return ThrottleSubscriber;
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| 89 | }(SimpleOuterSubscriber));
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| 90 | //# sourceMappingURL=throttle.js.map
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