@instructure/ui-react-utils/es/safeCloneElement.js

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2015 - present Instructure, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
import React from 'react';
import { logWarn as warn } from '@instructure/console';
import { createChainedFunction } from '@instructure/ui-utils';

/**
 * ---
 * category: utilities/react
 * ---
 * Clones a React element without overwriting refs.
 * @param element The element to clone
 * @param props Props of the element
 * @param children
 */
function safeCloneElement(element, props) {
  const cloneRef = props.ref;
  const originalRef = element.ref;
  const originalRefIsAFunction = typeof originalRef === 'function';
  const cloneRefIsFunction = typeof cloneRef === 'function';
  const mergedProps = { ...props
  };

  if (element.props.style && props.style) {
    // merge with existing styles
    mergedProps.style = { ...element.props.style,
      ...props.style
    };
  } // prevent overriding existing keys


  mergedProps.key = element.key || props.key; // Add chained function to preserve existing event handlers

  Object.keys(props).forEach(prop => {
    // If prop looks like an event handler "on*" and either
    // props[props] or element.props[prop] is a function create a chained function.
    // If only one is a function it will just use that function with no extra overhead.
    // This is necessary in cases where props[prop] is `null` or `undefined` which would
    // otherwise unwantedly override element.props[prop].
    if (prop.indexOf('on') === 0 && (typeof props[prop] === 'function' || typeof element.props[prop] === 'function')) {
      ;
      mergedProps[prop] = createChainedFunction(element.props[prop], props[prop]);
    }
  });

  for (var _len = arguments.length, children = new Array(_len > 2 ? _len - 2 : 0), _key = 2; _key < _len; _key++) {
    children[_key - 2] = arguments[_key];
  }

  if (originalRef == null || cloneRef == null) {
    return /*#__PURE__*/React.cloneElement(element, mergedProps, ...children);
  }

  warn(originalRefIsAFunction, `Cloning an element with a ref that will be overwritten because the ref \
is not a function. Use a composable callback-style ref instead. \
Ignoring ref: ${originalRef}`);
  return /*#__PURE__*/React.cloneElement(element, { ...mergedProps,

    ref(component) {
      if (cloneRefIsFunction) {
        ;
        cloneRef(component);
      } else {
        cloneRef.current = component;
      }

      originalRef(component);
    }

  }, ...children);
}

export default safeCloneElement;
export { safeCloneElement };