Fix wxMSW build with wxUSE_UXTHEME==0

Make wxUxThemeIsActive() available even in this case to fix compilation
in some places and add the unavoidable preprocessor checks in other
ones.

Closes #18207.

include/wx/aui/auibar.h

@@ -759,7 +759,7 @@ typedef void (wxEvtHandler::*wxAuiToolBarEventFunction)(wxAuiToolBarEvent&);
 #define wxEVT_COMMAND_AUITOOLBAR_MIDDLE_CLICK     wxEVT_AUITOOLBAR_MIDDLE_CLICK
 #define wxEVT_COMMAND_AUITOOLBAR_BEGIN_DRAG       wxEVT_AUITOOLBAR_BEGIN_DRAG
 
-#ifdef __WXMSW__
+#if defined(__WXMSW__) && wxUSE_UXTHEME
     #define wxHAS_NATIVE_TOOLBAR_ART
     #include "wx/aui/barartmsw.h"
     #define wxAuiDefaultToolBarArt wxAuiMSWToolBarArt

include/wx/aui/tabart.h

@@ -318,7 +318,7 @@ protected:
         #define wxHAS_NATIVE_TABART
         #include "wx/aui/tabartgtk.h"
         #define wxAuiDefaultTabArt wxAuiGtkTabArt
-    #elif defined(__WXMSW__)
+    #elif defined(__WXMSW__) && wxUSE_UXTHEME
         #define wxHAS_NATIVE_TABART
         #include "wx/aui/tabartmsw.h"
         #define wxAuiDefaultTabArt wxAuiMSWTabArt

include/wx/msw/uxtheme.h

@@ -13,6 +13,8 @@
 
 #include "wx/defs.h"
 
+#if wxUSE_UXTHEME
+
 #include "wx/msw/private.h"     // we use GetHwndOf()
 #include <uxtheme.h>
 
@@ -253,5 +255,11 @@ private:
     wxDECLARE_NO_COPY_CLASS(wxUxThemeHandle);
 };
 
+#else // !wxUSE_UXTHEME
+
+inline bool wxUxThemeIsActive() { return false; }
+
+#endif // wxUSE_UXTHEME/!wxUSE_UXTHEME
+
 #endif // _WX_UXTHEME_H_
 

include/wx/systhemectrl.h

@@ -12,7 +12,7 @@
 
 #include "wx/defs.h"
 
-#if defined(__WXMSW__) && !defined(__WXUNIVERSAL__)
+#if defined(__WXMSW__) && wxUSE_UXTHEME && !defined(__WXUNIVERSAL__)
     #define wxHAS_SYSTEM_THEMED_CONTROL
 #endif