Make wxSTAY_ON_TOP and other window styles toggleable via SetWindowStyleFlag under OS X Cocoa.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62568 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/cocoa/private.h

@@ -210,6 +210,7 @@ public :
     bool SetTransparent(wxByte alpha);
     bool SetBackgroundColour(const wxColour& col );
     void SetExtraStyle( long exStyle );
+    void SetWindowStyleFlag( long style );
     bool SetBackgroundStyle(wxBackgroundStyle style);
     bool CanSetTransparent();
 

include/wx/osx/core/private.h

@@ -685,7 +685,11 @@ public :
     virtual void SetExtraStyle( long WXUNUSED(exStyle) )
     {
     }
-
+    
+    virtual void SetWindowStyleFlag( long WXUNUSED(style) )
+    {
+    }
+    
     virtual bool SetBackgroundStyle(wxBackgroundStyle WXUNUSED(style))
     {
         return false ;

include/wx/osx/nonownedwnd.h

@@ -80,6 +80,7 @@ public:
     static void MacDelayedDeactivation(long timestamp);
     virtual void MacActivate( long timestamp , bool inIsActivating ) ;
 
+    virtual void SetWindowStyleFlag(long flags);
 
     virtual void Raise();
     virtual void Lower();