@etsoo/toolpad
Version:
Dashboard framework extention based on Toolpad Core
42 lines (41 loc) • 1.5 kB
JavaScript
import * as React from "react";
function defer(fn, params, delay) {
const timeout = setTimeout(() => {
fn.current(...params);
}, delay);
return { startTime: Date.now(), timeout, params };
}
/**
* Creates a debounced version of the handler that is passed. The invocation of [fn] is
* delayed for [delay] milliseconds from the last invocation of the debounced function.
*
* This implementation adds on the lodash implementation in that it handles updates to the
* delay value.
*/
export default function useDebouncedHandler(fn, delay) {
const fnRef = React.useRef(fn);
React.useEffect(() => {
fnRef.current = fn;
}, [fn]);
const delayedInvocation = React.useRef(null);
const clearCurrent = React.useCallback(() => {
if (delayedInvocation.current) {
clearTimeout(delayedInvocation.current.timeout);
delayedInvocation.current = null;
}
}, []);
React.useEffect(() => {
if (!delayedInvocation.current) {
return;
}
const { startTime, params } = delayedInvocation.current;
const elapsed = Date.now() - startTime;
const newDelay = Math.max(delay - elapsed, 0);
clearCurrent();
delayedInvocation.current = defer(fnRef, params, newDelay);
}, [delay, clearCurrent]);
return React.useCallback((...params) => {
clearCurrent();
delayedInvocation.current = defer(fnRef, params, delay);
}, [delay, clearCurrent]);
}