From 197d10471c4204db10fe220301613d312d58daae Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=9F=B3=E5=8D=9A=E6=96=87?= <sbw@sbw.so>
Date: Thu, 23 Jun 2016 14:38:54 +0800
Subject: [PATCH] fix crash when drag in other item

Change-Id: I0c29d39d72aad0be96cfde83b2c3f13e5eb45225
---
 frame/panel/mainpanel.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/frame/panel/mainpanel.cpp b/frame/panel/mainpanel.cpp
index f2d0818ed..81da08a26 100644
--- a/frame/panel/mainpanel.cpp
+++ b/frame/panel/mainpanel.cpp
@@ -80,10 +80,13 @@ void MainPanel::resizeEvent(QResizeEvent *e)
 
 void MainPanel::dragEnterEvent(QDragEnterEvent *e)
 {
-    // TODO: check
+    DockItem *dragSourceItem = qobject_cast<DockItem *>(e->source());
+    if (!dragSourceItem)
+        return;
+
     e->accept();
 
-    if (qobject_cast<DockItem *>(e->source()))
+    if (dragSourceItem)
         DragingItem->show();
 }