46 lines
1.1 KiB
TypeScript
46 lines
1.1 KiB
TypeScript
import { Mirror, throttleOptions } from './types';
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export const mirror: Mirror = {
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map: {},
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getId(n) {
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return n.__sn && n.__sn.id;
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},
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getNode(id) {
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return mirror.map[id];
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},
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};
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// copy from underscore
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export function throttle<T>(
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func: (arg: T) => void,
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wait: number,
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options: throttleOptions = {},
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) {
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let timeout: number | null = null;
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let previous = 0;
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// tslint:disable-next-line: only-arrow-functions
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return function() {
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let now = Date.now();
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if (!previous && options.leading === false) {
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previous = now;
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}
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let remaining = wait - (now - previous);
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let context = this;
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let args = arguments;
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if (remaining <= 0 || remaining > wait) {
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if (timeout) {
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clearTimeout(timeout);
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timeout = null;
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}
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previous = now;
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func.apply(context, args);
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} else if (!timeout && options.trailing !== false) {
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timeout = setTimeout(() => {
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previous = options.leading === false ? 0 : Date.now();
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timeout = null;
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func.apply(context, args);
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}, remaining);
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}
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};
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}
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