perf: flatten children

components/_util/props-util.js

@@ -67,12 +67,39 @@ const getSlots = ele => {
   });
   return { ...slots, ...getScopedSlots(ele) };
 };
+
+const flattenChildren = (children = [], filterEmpty = true) => {
+  const temp = Array.isArray(children) ? children : [children];
+  const res = [];
+  temp.forEach(child => {
+    if (Array.isArray(child)) {
+      res.push(...flattenChildren(child, filterEmpty));
+    } else if (child && child.type === Fragment) {
+      res.push(...flattenChildren(child.children, filterEmpty));
+    } else if (child && isVNode(child)) {
+      if (filterEmpty && !isEmptyElement(child)) {
+        res.push(child);
+      } else if (!filterEmpty) {
+        res.push(child);
+      }
+    }
+  });
+  return res;
+};
+
 const getSlot = (self, name = 'default', options = {}) => {
-  let res = self.$slots[name] && self.$slots[name](options);
+  if (isVNode(self)) {
-  while (res && res.length === 1 && (res[0].type === Fragment || Array.isArray(res[0]))) {
+    if (self.type === Fragment) {
-    res = res[0].children || res[0];
+      return name === 'default' ? flattenChildren(self.children) : [];
+    } else if (self.children && self.children[name]) {
+      return flattenChildren(self.children[name](options));
+    } else {
+      return [];
+    }
+  } else {
+    let res = self.$slots[name] && self.$slots[name](options);
+    return flattenChildren(res);
   }
-  return res && res.__v_isVNode ? [res] : res;
 };
 
 const getAllChildren = ele => {
@@ -128,26 +155,32 @@ const getOptionProps = instance => {
   return res;
 };
 const getComponent = (instance, prop = 'default', options = instance, execute = true) => {
+  let com = undefined;
   if (instance.$) {
     const temp = instance[prop];
     if (temp !== undefined) {
       return typeof temp === 'function' && execute ? temp(options) : temp;
     } else {
-      let com = instance.$slots[prop];
+      com = instance.$slots[prop];
       com = execute && com ? com(options) : com;
-      return Array.isArray(com) && com.length === 1 ? com[0] : com;
     }
   } else if (isVNode(instance)) {
     const temp = instance.props && instance.props[prop];
-    if (temp !== undefined && temp !== null) {
+    if (temp !== undefined && instance.props !== null) {
       return typeof temp === 'function' && execute ? temp(options) : temp;
+    } else if (instance.type === Fragment) {
+      com = instance.children;
     } else if (instance.children && instance.children[prop]) {
-      let com = instance.children[prop];
+      com = instance.children[prop];
       com = execute && com ? com(options) : com;
-      return Array.isArray(com) && com.length === 1 ? com[0] : com;
     }
   }
-  return undefined;
+  if (Array.isArray(com)) {
+    com = flattenChildren(com);
+    com = com.length === 1 ? com[0] : com;
+    com = com.length === 0 ? undefined : com;
+  }
+  return com;
 };
 const getComponentFromProp = (instance, prop, options = instance, execute = true) => {
   if (instance.$createElement) {
@@ -381,5 +414,6 @@ export {
   getAllProps,
   getAllChildren,
   findDOMNode,
+  flattenChildren,
 };
 export default hasProp;

components/vc-select/DropdownMenu.jsx

@@ -5,7 +5,7 @@ import scrollIntoView from 'dom-scroll-into-view';
 import { getSelectKeys, preventDefaultEvent, saveRef } from './util';
 import { cloneElement } from '../_util/vnode';
 import BaseMixin from '../_util/BaseMixin';
-import { findDOMNode } from '../_util/props-util';
+import { findDOMNode, getSlot } from '../_util/props-util';
 
 export default {
   name: 'DropdownMenu',
@@ -152,7 +152,7 @@ export default {
 
           clonedMenuItems = menuItems.map(item => {
             if (item.type.isMenuItemGroup) {
-              const children = (item.children?.default() || []).map(clone);
+              const children = getSlot(item).map(clone);
               const newItem = cloneElement(item);
               newItem.children = { ...item.children, default: () => children };
               return newItem;

components/vc-select/Select.jsx

@@ -14,6 +14,7 @@ import {
   getComponent,
   getEvents,
   getOptionProps,
+  getSlot,
 } from '../_util/props-util';
 import getTransitionProps from '../_util/getTransitionProps';
 import { cloneElement } from '../_util/vnode';
@@ -223,11 +224,11 @@ const Select = {
     },
     getOptionsFromChildren(children = [], options = []) {
       children.forEach(child => {
-        if (!child.data || child.data.slot !== undefined) {
+        if (!child) {
           return;
         }
         if (child.type?.isSelectOptGroup) {
-          this.getOptionsFromChildren(child.children?.default(), options);
+          this.getOptionsFromChildren(getSlot(child), options);
         } else {
           options.push(child);
         }
@@ -782,7 +783,7 @@ const Select = {
       const props = this.$props;
       const { _inputValue: inputValue, _mirrorInputValue } = this.$data;
       const attrs = this.$attrs;
-      const defaultInput = <input id={attrs.id} autoComplete="off" />;
+      const defaultInput = <input {...(attrs.id !== undefined ? {id: attrs.id}: {})} autoComplete="off"/>;
 
       const inputElement = props.getInputElement ? props.getInputElement() : defaultInput;
       const inputCls = classnames(inputElement.class, {
@@ -795,7 +796,6 @@ const Select = {
         <div class={`${props.prefixCls}-search__field__wrap`} onClick={this.inputClick}>
           {cloneElement(inputElement, {
             disabled: props.disabled,
-            value: inputValue,
             ...(inputElement.props || {}),
             disabled: props.disabled,
             value: inputValue,
@@ -881,6 +881,21 @@ const Select = {
         if (fireSearch) {
           this.$emit('search', inputValue);
         }
+      } else {
+        // TODO
+        // https://github.com/vuejs/vue-next/issues/1471
+        this.setState(
+          {
+            _inputValue: `${inputValue} `,
+          },
+        );
+        this.$nextTick(()=>{
+          this.setState(
+            {
+              _inputValue: inputValue,
+            },
+          );
+        });
       }
     },
     getValueByInput(str) {
@@ -1200,7 +1215,7 @@ const Select = {
               const childValueSub = getValuePropValue(subChild) || subChild.key;
               return (
                 <MenuItem key={childValueSub} value={childValueSub} {...subChild.props}>
-                  {...(subChild.children?.default())}
+                  {...getSlot(subChild)}
                 </MenuItem>
               );
             });
@@ -1247,7 +1262,7 @@ const Select = {
             style: UNSELECTABLE_STYLE,
             class: child?.class,
           };
-          const menuItem = <MenuItem {...p}>{child.children?.default()}</MenuItem>;
+          const menuItem = <MenuItem {...p}>{getSlot(child)}</MenuItem>;
           sel.push(menuItem);
           menuItems.push(menuItem);
         }
@@ -1503,14 +1518,17 @@ const Select = {
         }
       }
     },
-    selectionRefFocus(e) {
+    selectionRefFocus() {
-      if (this._focused || this.disabled || isMultipleOrTagsOrCombobox(this.$props)) {
+      if (this.getInputDOMNode() && this.getInputDOMNode()) {
-        e.preventDefault();
+        this.getInputDOMNode().focus();
-        return;
       }
-      this._focused = true;
+      // if (this._focused || this.disabled || isMultipleOrTagsOrCombobox(this.$props)) {
-      this.updateFocusClassName();
+      //   e.preventDefault();
-      this.$emit('focus');
+      //   return;
+      // }
+      // this._focused = true;
+      // this.updateFocusClassName();
+      // this.$emit('focus');
     },
     selectionRefBlur(e) {
       if (isMultipleOrTagsOrCombobox(this.$props)) {

components/vc-select/util.js

@@ -1,4 +1,4 @@
-import { getPropsData, getComponent } from '../_util/props-util';
+import { getPropsData, getComponent, getSlot } from '../_util/props-util';
 import { cloneElement } from '../_util/vnode';
 import { isVNode, Text } from 'vue';
 
@@ -115,7 +115,7 @@ export function getSelectKeys(menuItems = [], value) {
   let selectedKeys = [];
   menuItems.forEach(item => {
     if (item.type?.isMenuItemGroup) {
-      selectedKeys = selectedKeys.concat(getSelectKeys(item.children?.default(), value));
+      selectedKeys = selectedKeys.concat(getSelectKeys(getSlot(item), value));
     } else {
       const itemValue = getValuePropValue(item);
       const itemKey = item.key;
@@ -141,7 +141,7 @@ export function findFirstMenuItem(children) {
     const child = children[i];
     const props = getPropsData(child);
     if (child.type?.isMenuItemGroup) {
-      const found = findFirstMenuItem(child.children?.default());
+      const found = findFirstMenuItem(getSlot(child));
       if (found) {
         return found;
       }