diff --git a/src/device/DeviceManager.cpp b/src/device/DeviceManager.cpp
index fd8f806..d86f31d 100644
--- a/src/device/DeviceManager.cpp
+++ b/src/device/DeviceManager.cpp
@@ -9,6 +9,7 @@
 #include <QDate>
 #include <QDateTime>
 #include <qdebug.h>
+#include <src/appvals/AppGlobalValues.h>
 
 #define TRIGGER_EVENT EventCenter::Default()->triggerEvent
 
@@ -90,6 +91,7 @@ void DeviceManager::initDevice() {
 //            THROW_ERROR(msg);
 //            return;
 //        };
+        AppGlobalValues::setInProcessing(true);
         TRIGGER_EVENT(GUIEvents::InvokeOperationStart, nullptr, nullptr);
         //ScanControl fail
         qDebug() << "Request stop!";
@@ -113,6 +115,7 @@ void DeviceManager::initDevice() {
         TRIGGER_EVENT(GUIEvents::GlobalBannerMessage, nullptr, (QObject *) &s);
         TRIGGER_EVENT(GUIEvents::InvokeOperationEnd, nullptr, nullptr);
         TRIGGER_EVENT(GUIEvents::ResponseStop, nullptr, nullptr);
+        AppGlobalValues::setInProcessing(false);
     });
 
     // preview
@@ -123,6 +126,7 @@ void DeviceManager::initDevice() {
         qDebug() << "PreviewScan request status, status:" << getStatusString(inf.status);
         if (inf.status==READY)
         {
+            AppGlobalValues::setInProcessing(true);
             TRIGGER_EVENT(GUIEvents::InvokeOperationStart, nullptr, nullptr);
             //ScanControl
             qDebug()<<"Request preview!";
@@ -217,7 +221,9 @@ void DeviceManager::timerEvent(QTimerEvent *event) {
                     qDebug() << "Scan finished";
                     QVariant var(true);
                     qDebug() << "InvokeOperationEnd";
+
                     TRIGGER_EVENT(GUIEvents::InvokeOperationEnd, nullptr, (QObject *) &var);
+                    AppGlobalValues::setInProcessing(false);
                     lastStatus = -1;
                     previewing = false;
                     QString s("%1  %2");
@@ -258,6 +264,7 @@ void DeviceManager::processScan(const char *json, bool empty) {
         return;
     }
     static QString msg = "Start scan...";
+    AppGlobalValues::setInProcessing(true);
     TRIGGER_EVENT(GUIEvents::InvokeOperationStart, nullptr, (QObject *) &msg);
     qDebug() << "SetScanInfo>>>>>>>>>>>>>>>>>>>>";
     int ret = SetScanInfo(json, empty ? 1 : 0);