From bf9fff134fc06648de85bd8f0d1c40d0436dde33 Mon Sep 17 00:00:00 2001
From: guy <guy@finereport.com>
Date: Sat, 27 Jun 2020 10:55:01 +0800
Subject: [PATCH] update

---
 src/base/list/virtuallist.js | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/base/list/virtuallist.js b/src/base/list/virtuallist.js
index 97966bc311..905c06ca55 100644
--- a/src/base/list/virtuallist.js
+++ b/src/base/list/virtuallist.js
@@ -132,9 +132,8 @@ BI.VirtualList = BI.inherit(BI.Widget, {
         }
         this.container.element.prepend(firstFragment);
         this.container.element.append(lastFragment);
-        this.topBlank.setHeight(this.cache[start < 0 ? 0 : start].scrollTop);
-        var lastCache = this.cache[Math.min(end, this.renderedIndex)];
-        this.bottomBlank.setHeight(this.tree.sumTo(this.renderedIndex) - lastCache.scrollTop - lastCache.height);
+        this.topBlank.setHeight(this.tree.sumTo(Math.max(-1, start - 1)));
+        this.bottomBlank.setHeight(this.tree.sumTo(this.renderedIndex) - this.tree.sumTo(Math.min(end, this.renderedIndex)));
         BI.each(needDestroyed, function (i, child) {
             child && child._destroy();
         });