加入多级菜单联动逻辑

src/components/NiceForm/linkages/linkEnum.ts

+import { useValueLinkageEffect, FormPath, FormEffectHooks } from '@formily/antd'
+
+
+/**
+ * 联动逻辑, 主要用于处理省市区等联动, 必须手动设置 originData
+ * @param childKey 子集菜单key
+ * @param [transformFn] 用于是否转化label和value的字段,可不传
+ * @author xjm
+ * @example `
+  <NiceForm
+    onSubmit={values => console.log(values)}
+    actions = {actions}
+    effects={($, {setFieldState}) => {
+      onFormMount$().subscribe(() => {
+        mockData().then((data:any) => {
+          setFieldState('a', state => {
+            state.originData = data
+            state.props.enum = data.map(v => ({
+              label: v.name,
+              value: v.id
+            }))
+          })
+        })
+      })
+
+      useLinkEnumEffect(data => data.map(v => ({
+        label: v.name,
+        value: v.id
+      })), 'children')
+    }}
+    schema={{
+      type: 'object',
+      properties: {
+        a: {
+          type: 'string',
+          enum: [],
+          "x-linkages": [
+            {
+              type: 'value:linkage',
+              condition: "{{!!$value}}",
+              origin: 'a',
+              target: 'b',
+            }
+          ]
+        },
+        b: {
+          type: 'string',
+          enum: [],
+          "x-linkages": [
+            {
+              type: 'value:linkage',
+              condition: "{{!!$value}}",
+              origin: 'b',
+              target: 'c'
+            }
+          ]
+        },
+        c: {
+          type: 'string',
+          enum: []
+        }
+      }
+    }}
+    />
+ * 
+ * `
+ */
+export const useLinkEnumEffect = (childKey, transformFn?) => {
+  useValueLinkageEffect({
+    type: 'value:linkage',
+    resolve: ({origin, target}, { setFieldState, getFieldState }) => {
+      getFieldState(origin, state => {
+        const { originData = [] } = state
+        setFieldState(target, targetState => {
+          const result = originData.find(v => v.id === state.value)[childKey] || []
+          targetState.value = ''
+          targetState.originData = result
+          targetState.props.enum = transformFn ? transformFn(result) : result
+        })
+      })
+    },
+    reject: ({target}, { setFieldState, getFieldState }) => {
+      setFieldState(target, targetState => {
+        targetState.value = ''
+        targetState.props.enum = []
+      })
+    }
+  })
+}
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