Re: class constrctor code

> a) I am still trying to wrap my brain around class
> constructor in wx.NET. I wonder what the following
> code does (as in e.g. Dialog and Button):
> 
> public Button( IntPtr wxObject ): base(wxObject)
> {
> }

The constructors that take the 'IntPtr' are (or will be) used when
constructing an object for which no C# reference is directly available
(basically, in Object::CreateFromObject and Event::CreateFrom.)

For example, when an event is received (in EvtHandler::MarshalEvent),
all that is available is an IntPtr to the C++ wxEvent subclass.  Using
the event type for the IntPtr, the IntPtr is used to create the
appropriate C# class for that event type (in Event::CreateFrom.)

The method of doing this is via a hashtable constructed in Event's
static constructor.  The hashtable links event types to object types.

A similar variation of this is used in Object, except that the wxWindows
RTTI strings are used to construct the hashtable.

I will extend the tutorial that I wrote to include this information the
next chance I get.

> and why it sometimes is "public" and sometimes defined
> as "internal" (e.g. in Dialog).

They _should_ be declared as 'internal', this is probably a bit of a
mess-up on my part, since I probably had the same difficulty as you are
having now.

> b) Am i right that it is the ultimate aim that
> class construction is always done through the
> wxXxxxx_Create interface and not through the
> wxXxxxx_ctor interface (so it should look like
> what e.g. Button currently does).

Yes; doing it this way seems to make life a little easier (less
constructors required in the C wrapper.)

-- 
Bryan Bulten
http://opendev.ods.org/
http://wxnet.sourceforge.net/

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