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node_modules/vant/es/mixins/relation.js

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+import { sortChildren } from '../utils/vnodes';
+export function ChildrenMixin(_parent, options) {
+  var _inject, _computed;
+
+  if (options === void 0) {
+    options = {};
+  }
+
+  var indexKey = options.indexKey || 'index';
+  return {
+    inject: (_inject = {}, _inject[_parent] = {
+      default: null
+    }, _inject),
+    computed: (_computed = {
+      parent: function parent() {
+        if (this.disableBindRelation) {
+          return null;
+        }
+
+        return this[_parent];
+      }
+    }, _computed[indexKey] = function () {
+      this.bindRelation();
+
+      if (this.parent) {
+        return this.parent.children.indexOf(this);
+      }
+
+      return null;
+    }, _computed),
+    watch: {
+      disableBindRelation: function disableBindRelation(val) {
+        if (!val) {
+          this.bindRelation();
+        }
+      }
+    },
+    mounted: function mounted() {
+      this.bindRelation();
+    },
+    beforeDestroy: function beforeDestroy() {
+      var _this = this;
+
+      if (this.parent) {
+        this.parent.children = this.parent.children.filter(function (item) {
+          return item !== _this;
+        });
+      }
+    },
+    methods: {
+      bindRelation: function bindRelation() {
+        if (!this.parent || this.parent.children.indexOf(this) !== -1) {
+          return;
+        }
+
+        var children = [].concat(this.parent.children, [this]);
+        sortChildren(children, this.parent);
+        this.parent.children = children;
+      }
+    }
+  };
+}
+export function ParentMixin(parent) {
+  return {
+    provide: function provide() {
+      var _ref;
+
+      return _ref = {}, _ref[parent] = this, _ref;
+    },
+    data: function data() {
+      return {
+        children: []
+      };
+    }
+  };
+}