Handling the multiscreen option

src/core/UBApplication.cpp

@@ -55,6 +55,7 @@
 #include "frameworks/UBCryptoUtils.h"
 #include "tools/UBToolsManager.h"
 
+#include "UBDisplayManager.h"
 #include "core/memcheck.h"
 
 QPointer<QUndoStack> UBApplication::undoStack;
@@ -378,9 +379,18 @@ int UBApplication::exec(const QString& pFileToImport)
     else
         applicationController->showBoard();
 
+    onScreenCountChanged(1);
+    connect(desktop(), SIGNAL(screenCountChanged(int)), this, SLOT(onScreenCountChanged(int)));
     return QApplication::exec();
 }
 
+void UBApplication::onScreenCountChanged(int newCount)
+{
+    Q_UNUSED(newCount);
+    UBDisplayManager displayManager;
+    mainWindow->actionMultiScreen->setEnabled(displayManager.numScreens() > 1);
+}
+
 void UBApplication::importUniboardFiles()
 {
     mUniboardSankoreTransition = new UniboardSankoreTransition();

src/core/UBApplication.h

@@ -117,6 +117,8 @@ class UBApplication : public QtSingleApplication
 #endif
         void importUniboardFiles();
 
+        void onScreenCountChanged(int newCount);
+
     private:
         void updateProtoActionsState();
         void setupTranslators(QStringList args);

src/core/UBPreferencesController.cpp

@@ -88,6 +88,7 @@ UBPreferencesController::~UBPreferencesController()
 
 void UBPreferencesController::adjustScreens(int screen)
 {
+    Q_UNUSED(screen);
     UBDisplayManager displayManager;
     mPreferencesUI->multiDisplayGroupBox->setEnabled(displayManager.numScreens() > 1);
 }