Implement native OS X ComboBox for OS X Cocoa, and implement wxTextEntry methods to share code between wxComboBox and wxTextCtrl.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63105 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/core/private.h

@@ -470,7 +470,7 @@ public :
                                     long style,
                                     long extraStyle);
 
-#ifdef wxOSX_USE_NATIVE_COMBOBOX
+#if wxOSX_USE_COCOA
     static wxWidgetImplType*    CreateComboBox( wxWindowMac* wxpeer, 
                                     wxWindowMac* parent, 
                                     wxWindowID id, 
@@ -612,6 +612,31 @@ public :
     virtual wxSize GetBestSize() const { return wxDefaultSize; }
 };
 
+// common interface for all implementations
+class WXDLLIMPEXP_CORE wxComboWidgetImpl
+
+{
+public :
+    wxComboWidgetImpl() {}
+
+    virtual ~wxComboWidgetImpl() {}
+  
+    virtual int GetSelectedItem() const { return -1; };
+    virtual void SetSelectedItem(int WXUNUSED(item)) {};
+    
+    virtual int GetNumberOfItems() const { return -1; };
+    
+    virtual void InsertItem(int WXUNUSED(pos), const wxString& WXUNUSED(item)) {}
+    
+    virtual void RemoveItem(int WXUNUSED(pos)) {}
+    
+    virtual void Clear() {}
+    
+    virtual wxString GetStringAtIndex(int WXUNUSED(pos)) const { return wxEmptyString; }
+    
+    virtual int FindString(const wxString& WXUNUSED(text)) const { return -1; }
+};
+
 //
 // common interface for buttons
 //