implemented subclass factories for XRC

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@17375 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

contrib/include/wx/xrc/xmlres.h

@@ -37,6 +37,9 @@ class WXDLLEXPORT wxFrame;
 class WXDLLEXPORT wxToolBar;
 
 class WXXMLDLLEXPORT wxXmlResourceHandler;
+class WXXMLDLLEXPORT wxXmlSubclassFactory;
+class WXXMLDLLEXPORT wxXmlSubclassFactoriesList;
+class wxXmlResourceModule;
 
 
 // These macros indicate current version of XML resources (this information is
@@ -133,6 +136,11 @@ public:
 
     // Removes all handlers
     void ClearHandlers();
+    
+    // Registers subclasses factory for use in XRC. This function is not meant
+    // for public use, please see the comment above wxXmlSubclassFactory
+    // definition.
+    static void AddSubclassFactory(wxXmlSubclassFactory *factory);
 
     // Loads menu from resource. Returns NULL on failure.
     wxMenu *LoadMenu(const wxString& name);
@@ -244,6 +252,9 @@ private:
 #endif
 
     friend class wxXmlResourceHandler;
+    friend class wxXmlResourceModule;
+
+    static wxXmlSubclassFactoriesList *ms_subclassFactories;
 
     // singleton instance:
     static wxXmlResource *ms_instance;
@@ -438,6 +449,20 @@ protected:
 void wxXmlInitResourceModule();
 
 
+// This class is used to create instances of XRC "object" nodes with "subclass"
+// property. It is _not_ supposed to be used by XRC users, you should instead
+// register your subclasses via wxWindows' RTTI mechanism. This class is useful
+// only for language bindings developer who need a way to implement subclassing
+// in wxWindows ports that don't support wxRTTI (e.g. wxPython).
+class WXXMLDLLEXPORT wxXmlSubclassFactory
+{
+public:
+    // Try to create instance of given class and return it, return NULL on failure:
+    virtual wxObject *Create(const wxString& className) = 0;
+    virtual ~wxXmlSubclassFactory() {}
+};
+
+
 /* -------------------------------------------------------------------------
    Backward compatibility macros. Do *NOT* use, they may disappear in future
    versions of the XRC library!