Add CHudBallInterface

Former-commit-id: cab29870fd

include/GuiSys/CGuiCompoundWidget.hpp

@@ -0,0 +1,16 @@
+#ifndef _CGUICOMPOUNDWIDGET
+#define _CGUICOMPOUNDWIDGET
+
+#include "GuiSys/CGuiWidget.hpp"
+
+class CGuiCompoundWidget : public CGuiWidget {
+public:
+  FourCC GetWidgetTypeID() const override { return -1; }
+
+  void OnVisibleChange() override;
+  void OnActiveChange() override;
+  virtual CGuiWidget* GetWorkerWidget(int id) const;
+private:
+};
+
+#endif // _CGUICOMPOUNDWIDGET