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Viewing file:     ChildMapping.js (4.88 KB)      -rw-r--r--

"use strict";

exports.__esModule = true;
exports.getChildMapping = getChildMapping;
exports.mergeChildMappings = mergeChildMappings;
exports.getInitialChildMapping = getInitialChildMapping;
exports.getNextChildMapping = getNextChildMapping;

var _react = require("react");

/**
 * Given `this.props.children`, return an object mapping key to child.
 *
 * @param {*} children `this.props.children`
 * @return {object} Mapping of key to child
 */
function getChildMapping(children, mapFn) {
  var mapper = function mapper(child) {
    return mapFn && (0, _react.isValidElement)(child) ? mapFn(child) : child;
  };

  var result = Object.create(null);
  if (children) _react.Children.map(children, function (c) {
    return c;
  }).forEach(function (child) {
    // run the map function here instead so that the key is the computed one
    result[child.key] = mapper(child);
  });
  return result;
}
/**
 * When you're adding or removing children some may be added or removed in the
 * same render pass. We want to show *both* since we want to simultaneously
 * animate elements in and out. This function takes a previous set of keys
 * and a new set of keys and merges them with its best guess of the correct
 * ordering. In the future we may expose some of the utilities in
 * ReactMultiChild to make this easy, but for now React itself does not
 * directly have this concept of the union of prevChildren and nextChildren
 * so we implement it here.
 *
 * @param {object} prev prev children as returned from
 * `ReactTransitionChildMapping.getChildMapping()`.
 * @param {object} next next children as returned from
 * `ReactTransitionChildMapping.getChildMapping()`.
 * @return {object} a key set that contains all keys in `prev` and all keys
 * in `next` in a reasonable order.
 */


function mergeChildMappings(prev, next) {
  prev = prev || {};
  next = next || {};

  function getValueForKey(key) {
    return key in next ? next[key] : prev[key];
  } // For each key of `next`, the list of keys to insert before that key in
  // the combined list


  var nextKeysPending = Object.create(null);
  var pendingKeys = [];

  for (var prevKey in prev) {
    if (prevKey in next) {
      if (pendingKeys.length) {
        nextKeysPending[prevKey] = pendingKeys;
        pendingKeys = [];
      }
    } else {
      pendingKeys.push(prevKey);
    }
  }

  var i;
  var childMapping = {};

  for (var nextKey in next) {
    if (nextKeysPending[nextKey]) {
      for (i = 0; i < nextKeysPending[nextKey].length; i++) {
        var pendingNextKey = nextKeysPending[nextKey][i];
        childMapping[nextKeysPending[nextKey][i]] = getValueForKey(pendingNextKey);
      }
    }

    childMapping[nextKey] = getValueForKey(nextKey);
  } // Finally, add the keys which didn't appear before any key in `next`


  for (i = 0; i < pendingKeys.length; i++) {
    childMapping[pendingKeys[i]] = getValueForKey(pendingKeys[i]);
  }

  return childMapping;
}

function getProp(child, prop, props) {
  return props[prop] != null ? props[prop] : child.props[prop];
}

function getInitialChildMapping(props, onExited) {
  return getChildMapping(props.children, function (child) {
    return (0, _react.cloneElement)(child, {
      onExited: onExited.bind(null, child),
      in: true,
      appear: getProp(child, 'appear', props),
      enter: getProp(child, 'enter', props),
      exit: getProp(child, 'exit', props)
    });
  });
}

function getNextChildMapping(nextProps, prevChildMapping, onExited) {
  var nextChildMapping = getChildMapping(nextProps.children);
  var children = mergeChildMappings(prevChildMapping, nextChildMapping);
  Object.keys(children).forEach(function (key) {
    var child = children[key];
    if (!(0, _react.isValidElement)(child)) return;
    var hasPrev = key in prevChildMapping;
    var hasNext = key in nextChildMapping;
    var prevChild = prevChildMapping[key];
    var isLeaving = (0, _react.isValidElement)(prevChild) && !prevChild.props.in; // item is new (entering)

    if (hasNext && (!hasPrev || isLeaving)) {
      // console.log('entering', key)
      children[key] = (0, _react.cloneElement)(child, {
        onExited: onExited.bind(null, child),
        in: true,
        exit: getProp(child, 'exit', nextProps),
        enter: getProp(child, 'enter', nextProps)
      });
    } else if (!hasNext && hasPrev && !isLeaving) {
      // item is old (exiting)
      // console.log('leaving', key)
      children[key] = (0, _react.cloneElement)(child, {
        in: false
      });
    } else if (hasNext && hasPrev && (0, _react.isValidElement)(prevChild)) {
      // item hasn't changed transition states
      // copy over the last transition props;
      // console.log('unchanged', key)
      children[key] = (0, _react.cloneElement)(child, {
        onExited: onExited.bind(null, child),
        in: prevChild.props.in,
        exit: getProp(child, 'exit', nextProps),
        enter: getProp(child, 'enter', nextProps)
      });
    }
  });
  return children;
}