react-native-wishlist/lib/module/TemplateValue.js

The fastest List component for React Native.

import { useEffect, useMemo } from 'react';
import { getUIInflatorRegistry } from './InflatorRepository';
import { generateId } from './Utils';
import { createRunInWishlistFn } from './WishlistJsRuntime';
export function createTemplateValue(mapper) {
  const id = generateId();
  function getOrCreateUIState() {
    'worklet';

    const registry = getUIInflatorRegistry();
    let state = registry.getTemplateValueState(id);
    if (!state) {
      state = {
        dirty: true,
        current: undefined
      };
      registry.setTemplateValueState(id, state);
    }
    return state;
  }
  function setDirty() {
    'worklet';

    const state = getOrCreateUIState();
    state.dirty = true;
  }
  function value() {
    'worklet';

    const registry = getUIInflatorRegistry();
    const state = getOrCreateUIState();
    if (state.dirty) {
      state.current = mapper(registry.getCurrentValue(), registry.getCurrentRootValue());
      state.dirty = false;
    }
    return state.current;
  }
  function remove() {
    createRunInWishlistFn(() => {
      'worklet';

      getUIInflatorRegistry().deleteTemplateValueState(id);
    });
  }
  return {
    __isTemplateValue: true,
    __setDirty: setDirty,
    __remove: remove,
    value
  };
}
export function isTemplateValue(value) {
  return value !== null && typeof value === 'object' && value.__isTemplateValue === true;
}
export function useTemplateValue(mapper) {
  const value = useMemo(() => {
    return createTemplateValue(mapper);
  }, [mapper]);
  useEffect(() => {
    return () => value.__remove();
  }, [value]);
  return value;
}
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