64 lines
1.7 KiB
JavaScript
64 lines
1.7 KiB
JavaScript
import { useRef, useEffect } from 'preact/hooks';
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import { effect } from '@preact/signals';
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function afterNextFrame( callback ) {
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const done = () => {
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cancelAnimationFrame( raf );
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setTimeout( callback );
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};
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const raf = requestAnimationFrame( done );
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}
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// Using the mangled properties:
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// this.c: this._callback
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// this.x: this._compute
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// https://github.com/preactjs/signals/blob/main/mangle.json
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function createFlusher( compute, notify ) {
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let flush;
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const dispose = effect( function () {
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flush = this.c.bind( this );
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this.x = compute;
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this.c = notify;
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return compute();
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} );
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return { flush, dispose };
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}
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// Version of `useSignalEffect` with a `useEffect`-like execution. This hook
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// implementation comes from this PR:
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// https://github.com/preactjs/signals/pull/290.
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//
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// We need to include it here in this repo until the mentioned PR is merged.
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export function useSignalEffect( cb ) {
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const callback = useRef( cb );
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callback.current = cb;
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useEffect( () => {
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const execute = () => callback.current();
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const notify = () => afterNextFrame( eff.flush );
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const eff = createFlusher( execute, notify );
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return eff.dispose;
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}, [] );
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}
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// For wrapperless hydration.
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// See https://gist.github.com/developit/f4c67a2ede71dc2fab7f357f39cff28c
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export const createRootFragment = ( parent, replaceNode ) => {
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replaceNode = [].concat( replaceNode );
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const s = replaceNode[ replaceNode.length - 1 ].nextSibling;
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function insert( c, r ) {
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parent.insertBefore( c, r || s );
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}
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return ( parent.__k = {
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nodeType: 1,
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parentNode: parent,
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firstChild: replaceNode[ 0 ],
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childNodes: replaceNode,
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insertBefore: insert,
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appendChild: insert,
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removeChild( c ) {
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parent.removeChild( c );
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},
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} );
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};
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