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14 KiB
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1 line
14 KiB
JSON
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{"ast":null,"code":"import { Children, cloneElement, isValidElement } from 'react';\n/**\n * Given `this.props.children`, return an object mapping key to child.\n *\n * @param {*} children `this.props.children`\n * @return {object} Mapping of key to child\n */\n\nexport function getChildMapping(children, mapFn) {\n var mapper = function mapper(child) {\n return mapFn && isValidElement(child) ? mapFn(child) : child;\n };\n\n var result = Object.create(null);\n if (children) Children.map(children, function (c) {\n return c;\n }).forEach(function (child) {\n // run the map function here instead so that the key is the computed one\n result[child.key] = mapper(child);\n });\n return result;\n}\n/**\n * When you're adding or removing children some may be added or removed in the\n * same render pass. We want to show *both* since we want to simultaneously\n * animate elements in and out. This function takes a previous set of keys\n * and a new set of keys and merges them with its best guess of the correct\n * ordering. In the future we may expose some of the utilities in\n * ReactMultiChild to make this easy, but for now React itself does not\n * directly have this concept of the union of prevChildren and nextChildren\n * so we implement it here.\n *\n * @param {object} prev prev children as returned from\n * `ReactTransitionChildMapping.getChildMapping()`.\n * @param {object} next next children as returned from\n * `ReactTransitionChildMapping.getChildMapping()`.\n * @return {object} a key set that contains all keys in `prev` and all keys\n * in `next` in a reasonable order.\n */\n\nexport function mergeChildMappings(prev, next) {\n prev = prev || {};\n next = next || {};\n\n function getValueForKey(key) {\n return key in next ? next[key] : prev[key];\n } // For each key of `next`, the list of keys to insert before that key in\n // the combined list\n\n\n var nextKeysPending = Object.create(null);\n var pendingKeys = [];\n\n for (var prevKey in prev) {\n if (prevKey in next) {\n if (pendingKeys.length) {\n nextKeysPending[prevKey] = pendingKeys;\n pendingKeys = [];\n }\n } else {\n pendingKeys.push(prevKey);\n }\n }\n\n var i;\n var childMapping = {};\n\n for (var nextKey in next) {\n if (nextKeysPending[nextKey]) {\n for (i = 0; i < nextKeysPending[nextKey].length; i++) {\n var pendingNextKey = nextKeysPending[nextKey][i];\n childMapping[nextKeysPending[nextKey][i]] = getValueForKey(pendingNextKey);\n }\n }\n\n childMapping[nextKey] = getValueForKey(nextKey);\n } // Finally, add the keys which didn't appear before any key in `next`\n\n\n for (i = 0; i < pendingKeys.length; i++) {\n childMapping[pendingKeys[i]] = getValueForKey(pendingKeys[i]);\n }\n\n return childMapping;\n}\n\nfunction getProp(child, prop, props) {\n return props[prop] != null ? props[prop] : child.props[prop];\n}\n\nexport function getInitialChildMapping(props, onExited) {\n return getChildMapping(props.children, function (child) {\n return cloneElement(child, {\n onExited: onExited.bind(null, child),\n in: true,\n appear: getProp(child, 'appear', props),\n enter: getProp(child, 'enter', props),\n exit: getProp(child, 'exit', props)\n });\n });\n}\nexport function getNextChildMapping(nextProps, prevChildMapping, onExited) {\n var nextChildMapping = getChildMapping(nextProps.children);\n var children = mergeChildMappings(prevChildMapping, nextChildMapping);\n Object.keys(children).forEach(function (key) {\n var child = children[key];\n if (!isValidElement(child)) return;\n var hasPrev = (key in prevChildMapping);\n var hasNext = (key in nextChildMapping);\n var prevChild = prevChildMapping[key];\n var isLeaving = isValidElement(prevChild) && !prevChild.props.in; // item is new (entering)\n\n if (hasNext && (!hasPrev || isLeaving)) {\n // console.log('entering', key)\n children[key] = cloneElement(child, {\n onExited: onExited.bind(null, child),\n in: true,\n ex
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