react-native-web/dist/vendor/react-native/VirtualizedList/VirtualizedListContext.js

React Native for Web

import _objectSpread from "@babel/runtime/helpers/objectSpread2";
/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * 
 * @format
 */

import * as React from 'react';
import { useContext, useMemo } from 'react';
var __DEV__ = process.env.NODE_ENV !== 'production';
export var VirtualizedListContext = /*#__PURE__*/React.createContext(null);
if (__DEV__) {
  VirtualizedListContext.displayName = 'VirtualizedListContext';
}

/**
 * Resets the context. Intended for use by portal-like components (e.g. Modal).
 */
export function VirtualizedListContextResetter(_ref) {
  var children = _ref.children;
  return /*#__PURE__*/React.createElement(VirtualizedListContext.Provider, {
    value: null
  }, children);
}

/**
 * Sets the context with memoization. Intended to be used by `VirtualizedList`.
 */
export function VirtualizedListContextProvider(_ref2) {
  var children = _ref2.children,
    value = _ref2.value;
  // Avoid setting a newly created context object if the values are identical.
  var context = useMemo(() => ({
    cellKey: null,
    getScrollMetrics: value.getScrollMetrics,
    horizontal: value.horizontal,
    getOutermostParentListRef: value.getOutermostParentListRef,
    registerAsNestedChild: value.registerAsNestedChild,
    unregisterAsNestedChild: value.unregisterAsNestedChild
  }), [value.getScrollMetrics, value.horizontal, value.getOutermostParentListRef, value.registerAsNestedChild, value.unregisterAsNestedChild]);
  return /*#__PURE__*/React.createElement(VirtualizedListContext.Provider, {
    value: context
  }, children);
}

/**
 * Sets the `cellKey`. Intended to be used by `VirtualizedList` for each cell.
 */
export function VirtualizedListCellContextProvider(_ref3) {
  var cellKey = _ref3.cellKey,
    children = _ref3.children;
  // Avoid setting a newly created context object if the values are identical.
  var currContext = useContext(VirtualizedListContext);
  var context = useMemo(() => currContext == null ? null : _objectSpread(_objectSpread({}, currContext), {}, {
    cellKey
  }), [currContext, cellKey]);
  return /*#__PURE__*/React.createElement(VirtualizedListContext.Provider, {
    value: context
  }, children);
}