Implementing event handler for objects

Hi

I'm wrapping a GUI toolkit using Luabind, and i've struck upon a problem 
with handling events.

The GUI-toolkit I'm wrapping is wxWidgets. Every widget inherits 
wxEvtHandler and that
class has a method called Bind() that is used to connect events to an 
event handler. A stupid example:

class MyClass {
     void init ()
     {
         b = wxButton (frm, -1, "Some button");
         b->Bind (wxEVT_COMMAND_BUTTON_CLICKED, 
&MyClass::HandleButtonClick, this);
     }

     void HandleButtonClick (wxCommandEvent& ev)
     {
         printf ("Button clicked.\n");
     }
}

My dream API for this in Lua would be:

     b = wx.Button (frm, -1, "Some button")
     b.on_click = function ()
         print ("Button clicked.\n")
     end

Or, even better:

     b.on_click:add (function ()
         print ("Button clicked, with multiple event handlers.\n")
     end

I guess I could live with something like this, which is more like the 
C++ API:

     b.bind (wx.EVT_COMMAND_BUTTON_CLICKED, function (ev)
         print ("Button clicked again...\n")
     end)

But I have no idea how to implement this using Luabind, without creating 
a wrapper class
for every class in the wxWidgets-library that I want to use.

I guess it would help if Luabind could automatically create a helper 
class for each class (say "wxLuaEventHandler"),
but I don't think that's possible? Kind of like a nested class, but not 
associated with any nested class in the base class.

Any suggestions?

Best regards,
Jonatan Magnusson



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