From 023ed668e9017da178bc4916e8b57503e1fcc455 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=9F=B3=E5=8D=9A=E6=96=87?= <sbw@sbw.so>
Date: Wed, 3 May 2017 16:53:23 +0800
Subject: [PATCH] hide preview if its empty

Change-Id: I04af518c834d26603de05a7ae7021fedc0c56675
---
 frame/item/components/previewcontainer.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/frame/item/components/previewcontainer.cpp b/frame/item/components/previewcontainer.cpp
index 48a75d8b1..81954952a 100644
--- a/frame/item/components/previewcontainer.cpp
+++ b/frame/item/components/previewcontainer.cpp
@@ -25,6 +25,14 @@ void PreviewContainer::setWindowInfos(const WindowDict &infos)
         delete item;
     }
 
+    if (infos.isEmpty())
+    {
+        emit requestCancelPreview();
+        emit requestHidePreview();
+
+        return;
+    }
+
     for (auto it(infos.cbegin()); it != infos.cend(); ++it)
     {
         PreviewWidget *w = new PreviewWidget(it.key());