diff --git a/QtScrcpy/device/device.cpp b/QtScrcpy/device/device.cpp
index c152e06..53304f5 100644
--- a/QtScrcpy/device/device.cpp
+++ b/QtScrcpy/device/device.cpp
@@ -239,6 +239,20 @@ void Device::startServer()
     });
 }
 
+void Device::setMainControl(bool mainControl)
+{
+    if (m_mainControl == mainControl) {
+        return;
+    }
+    m_mainControl = mainControl;
+    emit mainControlChange(this, m_mainControl);
+}
+
+bool Device::mainControl()
+{
+    return m_mainControl;
+}
+
 bool Device::saveFrame(const AVFrame* frame)
 {
     if (!frame) {
diff --git a/QtScrcpy/device/device.h b/QtScrcpy/device/device.h
index 2fb8917..e45aa50 100644
--- a/QtScrcpy/device/device.h
+++ b/QtScrcpy/device/device.h
@@ -40,9 +40,12 @@ public:
     const QString &getSerial();
 
     void updateScript(QString script);
+    void setMainControl(bool mainControl);
+    bool mainControl();
 
 signals:
     void deviceDisconnect(QString serial);
+    void mainControlChange(Device* device, bool mainControl);
 
 public slots:
     void onScreenshot();
@@ -67,6 +70,8 @@ private:
 
     QTime m_startTimeCount;
     DeviceParams m_params;
+
+    bool m_mainControl = false;
 };
 
 #endif // DEVICE_H
diff --git a/QtScrcpy/device/ui/toolform.cpp b/QtScrcpy/device/ui/toolform.cpp
index 452d6d6..9cceb5a 100644
--- a/QtScrcpy/device/ui/toolform.cpp
+++ b/QtScrcpy/device/ui/toolform.cpp
@@ -52,10 +52,10 @@ void ToolForm::initStyle()
 
 void ToolForm::updateGroupControl()
 {
-    if (!m_device || !m_device->getVideoForm()) {
+    if (!m_device) {
         return;
     }
-    if (m_device->getVideoForm()->mainControl()) {
+    if (m_device->mainControl()) {
         ui->groupControlBtn->setStyleSheet("color: red");
     } else {
         ui->groupControlBtn->setStyleSheet("color: #DCDCDC");
@@ -204,9 +204,9 @@ void ToolForm::on_touchBtn_clicked()
 
 void ToolForm::on_groupControlBtn_clicked()
 {
-    if (!m_device || !m_device->getVideoForm()) {
+    if (!m_device) {
         return;
     }
-    m_device->getVideoForm()->setMainControl(!m_device->getVideoForm()->mainControl());
+    m_device->setMainControl(!m_device->mainControl());
     updateGroupControl();
 }
diff --git a/QtScrcpy/device/ui/videoform.cpp b/QtScrcpy/device/ui/videoform.cpp
index 4b5997e..63b2f4e 100644
--- a/QtScrcpy/device/ui/videoform.cpp
+++ b/QtScrcpy/device/ui/videoform.cpp
@@ -255,25 +255,6 @@ void VideoForm::staysOnTop(bool top)
     }
 }
 
-Device *VideoForm::getDevice()
-{
-    return m_device;
-}
-
-void VideoForm::setMainControl(bool mainControl)
-{
-    if (m_mainControl == mainControl) {
-        return;
-    }
-    m_mainControl = mainControl;
-    emit mainControlChange(this, m_mainControl);
-}
-
-bool VideoForm::mainControl()
-{
-    return m_mainControl;
-}
-
 void VideoForm::setDevice(Device *device)
 {
     m_device = device;
diff --git a/QtScrcpy/device/ui/videoform.h b/QtScrcpy/device/ui/videoform.h
index 6557c64..26e5631 100644
--- a/QtScrcpy/device/ui/videoform.h
+++ b/QtScrcpy/device/ui/videoform.h
@@ -25,13 +25,9 @@ public:
     void updateShowSize(const QSize &newSize);
     void updateRender(const AVFrame *frame);
     void setDevice(Device *device);
-    Device* getDevice();
-    void setMainControl(bool mainControl);
-    bool mainControl();
 
 signals:
     void screenshot();
-    void mainControlChange(VideoForm* videoFrom, bool mainControl);
 
 public slots:
     void onGrabCursor(bool grab);
@@ -74,7 +70,6 @@ private:
     float m_widthHeightRatio = 0.5f;
     bool m_skin = true;
     QPoint m_fullScreenBeforePos;
-    bool m_mainControl = false;
 
     //outside member
     QPointer<Device> m_device;