react-native-gesture-handler/lib/module/v3/detectors/useGestureRelationsUpdater.js

Declarative API exposing native platform touch and gesture system to React Native

"use strict";

import { useEffect, useMemo } from 'react';
import { NativeProxy } from '../NativeProxy';
import { configureRelations } from './utils';
export function useGestureRelationsUpdater(gesture) {
  const relations = useMemo(() => gesture ? configureRelations(gesture) : null, [gesture]);
  useEffect(() => {
    if (!relations) {
      return;
    }

    // React runs effects bottom-up, we need to ensure that relations are applied after all effects
    // in the tree have run, so we defer to the next frame.
    const frame = requestAnimationFrame(() => {
      relations.forEach((rel, handlerTag) => {
        NativeProxy.configureRelations(handlerTag, rel);
      });
    });
    return () => cancelAnimationFrame(frame);
  }, [relations]);
}
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