diff --git a/src/ScanFormWidget.cpp b/src/ScanFormWidget.cpp
index d543b68..0feb6c5 100644
--- a/src/ScanFormWidget.cpp
+++ b/src/ScanFormWidget.cpp
@@ -99,12 +99,34 @@ ScanFormWidget::ScanFormWidget(QWidget *parent) : TabFormWidget(parent) {
     contentLayout->addWidget(param_widget);
     pat_inf = patient_information;
 
+    btnScan->setEnabled(false);
+    btnRefresh->setEnabled(false);
+    btnPreview->setEnabled(false);
+    btnStop->setEnabled(false);
+
+
     //Events---------------------------------------------------------------
     connect(EventCenter::Default(),&EventCenter::PatientSelected,[=](QObject* sender,QObject* data){
+        if(unset)
+        {
+            btnScan->setEnabled(true);
+            btnRefresh->setEnabled(true);
+            btnPreview->setEnabled(true);
+            btnStop->setEnabled(true);
+            unset = false;
+        }
         patient_information->setPatientInformation((PatientInformation*)data);
     });
 
     connect(group, SIGNAL(buttonClicked(int)),this,SLOT(protocolChanged(int)));
+
+    previewfunc = [=](bool val)->void{
+        btnPreview->setCheckable(val);
+        btnPreview->setChecked(val);
+        btnPreview->setEnabled(!val);
+        btnRefresh->setEnabled(!val);
+        btnScan->setEnabled(!val);
+    };
 }
 
 ScanFormWidget::~ScanFormWidget() {
@@ -115,3 +137,9 @@ void ScanFormWidget::protocolChanged(int type) {
     printf("%d\r\n",type);
     pat_inf->setProtocol(type);
 }
+
+void ScanFormWidget::setPreviewing(bool val) {
+    if(previewfunc) previewfunc(val);
+}
+
+
diff --git a/src/ScanFormWidget.h b/src/ScanFormWidget.h
index a60d757..d76526e 100644
--- a/src/ScanFormWidget.h
+++ b/src/ScanFormWidget.h
@@ -6,15 +6,19 @@
 #define GUI_SCANFORMWIDGET_H
 
 #include "tabformwidget.h"
+#include <functional>
 class PatientInformationForm;
 class ScanFormWidget :public TabFormWidget {
         Q_OBJECT
 public:
-        explicit ScanFormWidget(QWidget *parent = nullptr);
-        ~ScanFormWidget();
-
+    explicit ScanFormWidget(QWidget *parent = nullptr);
+    ~ScanFormWidget();
+    void setPreviewing(bool val);
 private:
     PatientInformationForm* pat_inf= nullptr;
+    bool unset = true;
+    bool previewing= false;
+    std::function<void(bool)> previewfunc = nullptr;
 private slots:
     void protocolChanged(int type);