+bool wxTopLevelWindowMac::SetTransparent(wxByte alpha)
+{
+ OSStatus result = SetWindowAlpha((WindowRef)m_macWindow, float(alpha)/255.0);
+ return result == noErr;
+}
+
+
+bool wxTopLevelWindowMac::CanSetTransparent()
+{
+ return true;
+}
+
+
+void wxTopLevelWindowMac::SetExtraStyle(long exStyle)
+{
+ if ( GetExtraStyle() == exStyle )
+ return ;
+
+ wxTopLevelWindowBase::SetExtraStyle( exStyle ) ;
+
+ if ( m_macWindow != NULL )
+ {
+ bool metal = GetExtraStyle() & wxFRAME_EX_METAL ;
+
+ if ( MacGetMetalAppearance() != metal )
+ {
+ if ( MacGetUnifiedAppearance() )
+ MacSetUnifiedAppearance( !metal ) ;
+
+ MacSetMetalAppearance( metal ) ;
+ }
+ }
+}
+
+bool wxTopLevelWindowMac::SetBackgroundStyle(wxBackgroundStyle style)
+{
+ if ( !wxTopLevelWindowBase::SetBackgroundStyle(style) )
+ return false ;
+
+ WindowRef windowRef = HIViewGetWindow( (HIViewRef)GetHandle() );
+
+ if ( GetBackgroundStyle() == wxBG_STYLE_TRANSPARENT )
+ {
+ OSStatus err = HIWindowChangeFeatures( windowRef, 0, kWindowIsOpaque );
+ verify_noerr( err );
+ err = ReshapeCustomWindow( windowRef );
+ verify_noerr( err );
+ }
+
+ return true ;
+}
+
+// TODO: switch to structure bounds -
+// we are still using coordinates of the content view
+//