react-native-reanimated/lib/module/reanimated2/ViewDescriptorsSet.js

More powerful alternative to Animated library for React Native.

'use strict';

import { useRef } from 'react';
import { makeMutable } from './core';
import { shouldBeUseWeb } from './PlatformChecker';
export function makeViewDescriptorsSet() {
  const shareableViewDescriptors = makeMutable([]);
  const data = {
    shareableViewDescriptors,
    add: item => {
      shareableViewDescriptors.modify(descriptors => {
        'worklet';

        const index = descriptors.findIndex(descriptor => descriptor.tag === item.tag);
        if (index !== -1) {
          descriptors[index] = item;
        } else {
          descriptors.push(item);
        }
        return descriptors;
      }, false);
    },
    remove: viewTag => {
      shareableViewDescriptors.modify(descriptors => {
        'worklet';

        const index = descriptors.findIndex(descriptor => descriptor.tag === viewTag);
        if (index !== -1) {
          descriptors.splice(index, 1);
        }
        return descriptors;
      }, false);
    }
  };
  return data;
}
const SHOULD_BE_USE_WEB = shouldBeUseWeb();
export const useViewRefSet = SHOULD_BE_USE_WEB ? useViewRefSetJS : useViewRefSetNative;
function useViewRefSetNative() {
  // Stub native implementation.
  return undefined;
}
function useViewRefSetJS() {
  const ref = useRef(null);
  if (ref.current === null) {
    const data = {
      items: new Set(),
      add: item => {
        if (data.items.has(item)) {
          return;
        }
        data.items.add(item);
      },
      remove: item => {
        data.items.delete(item);
      }
    };
    ref.current = data;
  }
  return ref.current;
}
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