refs #901, use CSingleApplicationUi for UI settings

plus stylesheet update to notice disabled component

src/blackgui/components/settingsguicomponent.cpp

@@ -27,6 +27,7 @@ namespace BlackGui
     {
         CSettingsGuiComponent::CSettingsGuiComponent(QWidget *parent) :
             QFrame(parent),
+            BlackGui::CSingleApplicationUi(this),
             ui(new Ui::CSettingsGuiComponent)
         {
             ui->setupUi(this);

src/blackgui/components/settingsguicomponent.h

@@ -12,6 +12,7 @@
 #ifndef BLACKGUI_COMPONENTS_SETTINGSGUICOMPONENT_H
 #define BLACKGUI_COMPONENTS_SETTINGSGUICOMPONENT_H
 
+#include "blackgui/singleapplicationui.h"
 #include "blackgui/settings/guisettings.h"
 #include <QFrame>
 #include <QScopedPointer>
@@ -24,7 +25,8 @@ namespace BlackGui
         /*!
          * General GUI settings
          */
-        class CSettingsGuiComponent : public QFrame
+        class CSettingsGuiComponent :
+            public QFrame, BlackGui::CSingleApplicationUi
         {
             Q_OBJECT
 

src/blackgui/share/qss/stdwidget.qss

@@ -282,6 +282,10 @@ QGroupBox {
   background-image: url(:/textures/icons/textures/texture-inner.jpg);
 }
 
+QGroupBox::disabled {
+  background: rgba(4, 105, 105, 105);
+}
+
 QGroupBox::title {
   top: 2px;
   left: 5px;