hugoWebsite/node_modules/rxjs/dist/esm5/internal/operators/throttle.js

50 lines
1.9 KiB
JavaScript

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