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openhis-ui/src/components/render/render.js

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+import { deepClone } from '@/utils/index'
+
+const componentChild = {}
+/**
+ * 将./slots中的文件挂载到对象componentChild上
+ * 文件名为key，对应JSON配置中的__config__.tag
+ * 文件内容为value，解析JSON配置中的__slot__
+ */
+const slotsFiles = require.context('./slots', false, /\.js$/)
+const keys = slotsFiles.keys() || []
+keys.forEach(key => {
+  const tag = key.replace(/^\.\/(.*)\.\w+$/, '$1')
+  const value = slotsFiles(key).default
+  componentChild[tag] = value
+})
+
+function vModel(dataObject, defaultValue, config) {
+  // 获取上传表单元素组件上传的文件
+  if (config.tag === "el-upload") {
+    // 上传表单元素组件的成功和移除事件
+    dataObject.attrs["on-success"] = (response, file, fileList) => {
+      this.$emit("upload", response, file, fileList);
+    };
+
+    dataObject.attrs["on-remove"] = (file, fileList) => {
+      this.$emit("deleteUpload", file, fileList);
+    };
+
+    dataObject.attrs["on-preview"] = (file, fileList) => {
+      this.$emit("previewUpload", file, fileList);
+    };
+
+    // 获取上传表单元素的默认值
+    try {
+      dataObject.props["file-list"] = JSON.parse(defaultValue);
+    } catch (err) {
+      console.warn(err);
+    }
+
+    return;
+  }
+
+  // 获取普通表单元素的值
+  dataObject.props.value = defaultValue;
+  dataObject.on.input = (val) => {
+    this.$emit("input", val);
+  };
+}
+
+function mountSlotFiles(h, confClone, children) {
+  const childObjs = componentChild[confClone.__config__.tag]
+  if (childObjs) {
+    Object.keys(childObjs).forEach(key => {
+      const childFunc = childObjs[key]
+      if (confClone.__slot__ && confClone.__slot__[key]) {
+        children.push(childFunc(h, confClone, key))
+      }
+    })
+  }
+}
+
+function emitEvents(confClone) {
+  ['on', 'nativeOn'].forEach(attr => {
+    const eventKeyList = Object.keys(confClone[attr] || {})
+    eventKeyList.forEach(key => {
+      const val = confClone[attr][key]
+      if (typeof val === 'string') {
+        confClone[attr][key] = event => this.$emit(val, event)
+      }
+    })
+  })
+}
+
+function buildDataObject(confClone, dataObject) {
+  Object.keys(confClone).forEach(key => {
+    const val = confClone[key]
+    if (key === '__vModel__') {
+      vModel.call(this, dataObject, confClone.__config__.defaultValue, confClone.__config__)
+    } else if (dataObject[key] !== undefined) {
+      if (dataObject[key] === null
+        || dataObject[key] instanceof RegExp
+        || ['boolean', 'string', 'number', 'function'].includes(typeof dataObject[key])) {
+        dataObject[key] = val
+      } else if (Array.isArray(dataObject[key])) {
+        dataObject[key] = [...dataObject[key], ...val]
+      } else {
+        dataObject[key] = { ...dataObject[key], ...val }
+      }
+    } else {
+      dataObject.attrs[key] = val
+    }
+  })
+
+  // 清理属性
+  clearAttrs(dataObject)
+}
+
+function clearAttrs(dataObject) {
+  delete dataObject.attrs.__config__
+  delete dataObject.attrs.__slot__
+  delete dataObject.attrs.__methods__
+}
+
+function makeDataObject() {
+  // 深入数据对象：
+  // https://cn.vuejs.org/v2/guide/render-function.html#%E6%B7%B1%E5%85%A5%E6%95%B0%E6%8D%AE%E5%AF%B9%E8%B1%A1
+  return {
+    class: {},
+    attrs: {},
+    props: {},
+    domProps: {},
+    nativeOn: {},
+    on: {},
+    style: {},
+    directives: [],
+    scopedSlots: {},
+    slot: null,
+    key: null,
+    ref: null,
+    refInFor: true
+  }
+}
+
+export default {
+  props: {
+    conf: {
+      type: Object,
+      required: true
+    }
+  },
+  render(h) {
+    const dataObject = makeDataObject()
+    const confClone = deepClone(this.conf)
+    const children = this.$slots.default || []
+
+    // 如果slots文件夹存在与当前tag同名的文件，则执行文件中的代码
+    mountSlotFiles.call(this, h, confClone, children)
+
+    // 将字符串类型的事件，发送为消息
+    emitEvents.call(this, confClone)
+
+    // 将json表单配置转化为vue render可以识别的 “数据对象（dataObject）”
+    buildDataObject.call(this, confClone, dataObject)
+
+    return h(this.conf.__config__.tag, dataObject, children)
+  }
+}