Make CreateClassDialog use the new WindowBase

apps/openmw/mwgui/class.cpp

@@ -380,19 +380,14 @@ ClassChoiceDialog::ClassChoiceDialog(MWWorld::Environment& environment)
 /* CreateClassDialog */
 
 CreateClassDialog::CreateClassDialog(MWWorld::Environment& environment)
-  : Layout("openmw_chargen_create_class_layout.xml")
-  , environment(environment)
+  : WindowBase("openmw_chargen_create_class_layout.xml", environment)
   , specDialog(nullptr)
   , attribDialog(nullptr)
   , skillDialog(nullptr)
   , descDialog(nullptr)
 {
     // Centre dialog
-    MyGUI::IntSize gameWindowSize = environment.mWindowManager->getGui()->getViewSize();
-    MyGUI::IntCoord coord = mMainWidget->getCoord();
-    coord.left = (gameWindowSize.width - coord.width)/2;
-    coord.top = (gameWindowSize.height - coord.height)/2;
-    mMainWidget->setCoord(coord);
+    center();
 
     WindowManager *wm = environment.mWindowManager;
     setText("SpecializationT", wm->getGameSettingString("sChooseClassMenu1", "Specialization"));

apps/openmw/mwgui/class.hpp

@@ -273,7 +273,7 @@ namespace MWGui
         MyGUI::EditPtr textEdit;
     };
 
-    class CreateClassDialog : public OEngine::GUI::Layout
+    class CreateClassDialog : public WindowBase
     {
     public:
         CreateClassDialog(MWWorld::Environment& environment);
@@ -317,8 +317,6 @@ namespace MWGui
         void onDialogCancel();
 
     private:
-        MWWorld::Environment& environment;
-
         MyGUI::EditPtr          editName;
         MyGUI::WidgetPtr        specializationName;
         Widgets::MWAttributePtr favoriteAttribute0, favoriteAttribute1;