From 94eaec6ec320bef2044426b1b17d527e5c2576d9 Mon Sep 17 00:00:00 2001
From: guy <guy@finereport.com>
Date: Fri, 20 Aug 2021 18:38:52 +0800
Subject: [PATCH] =?UTF-8?q?=E6=95=B4=E7=90=86=E4=BB=A3=E7=A0=81?=
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---
 src/core/wrapper/layout.js | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/src/core/wrapper/layout.js b/src/core/wrapper/layout.js
index b8a2615f1..6f1824b5d 100644
--- a/src/core/wrapper/layout.js
+++ b/src/core/wrapper/layout.js
@@ -440,19 +440,19 @@ BI.Layout = BI.inherit(BI.Widget, {
                 newStartVnode = newCh[++newStartIdx];
             } else {
                 var sameOldVnode = findOldVnode(oldCh, newStartVnode, oldStartIdx, oldEndIdx);
-                if (BI.isNull(sameOldVnode)) {  //  不存在就把新的放到左边
+                if (BI.isNull(sameOldVnode[0])) {  //  不存在就把新的放到左边
                     delete self._children[self._getChildName(newStartIdx)];
                     var node = addNode(newStartVnode, newStartIdx);
                     insertBefore(node, oldStartVnode);
                 } else {   //  如果新节点在旧节点区间中存在就复用一下
-                    BI.each(oldCh, function (index, child) {
-                        if (child && sameVnode(child, newStartVnode)) {
-                            updated = self.patchItem(sameOldVnode, newStartVnode, index, index) || updated;
-                            children[sameOldVnode.key == null ? index : sameOldVnode.key] = self._children[self._getChildName(index)];
-                            oldCh[index] = undefined;
-                            insertBefore(sameOldVnode, oldStartVnode);
-                        }
-                    });
+                    var sameOldIndex = sameOldVnode[1];
+                    updated = self.patchItem(sameOldVnode[0], newStartVnode, sameOldIndex, newStartIdx) || updated;
+                    children[sameOldVnode[0].key == null ? newStartIdx : sameOldVnode[0].key] = self._children[self._getChildName(newStartIdx)] = self._children[self._getChildName(sameOldIndex)];
+                    if (newStartIdx !== sameOldIndex) {
+                        delete self._children[self._getChildName(sameOldIndex)];
+                    }
+                    oldCh[sameOldIndex] = undefined;
+                    insertBefore(sameOldVnode[0], oldStartVnode);
                 }
                 newStartVnode = newCh[++newStartIdx];
             }
@@ -531,13 +531,14 @@ BI.Layout = BI.inherit(BI.Widget, {
         }
 
         function findOldVnode (vnodes, vNode, beginIdx, endIdx) {
-            var i, found;
+            var i, found, findIndex;
             for (i = beginIdx; i <= endIdx; ++i) {
                 if (vnodes[i] && sameVnode(vnodes[i], vNode)) {
                     found = vnodes[i];
+                    findIndex = i;
                 }
             }
-            return found;
+            return [found, findIndex];
         }
 
         return updated;