Wrapping my own widgets

[Chris Seaton <chris chrisseaton com>]

Hi,

I'm writing a widget in C with a C++ wrapper.

I don't think I want to use the gtkmm generators, as it's only one class 
and I don't want to make people download the sources of gtkmm just to 
build my widget's bindings, so I'm writing it by hand.

I'm looking at the Gtk::DrawingArea widget as an example, as my widget 
was based (just based in the copy-and-paste sense, not inherited or 
anything) on that when I was writing the C code for the widget, but the 
code makes no sense!

I know that it's generated so it'll be a bit of a mess, but nothing adds up!

For example, DrawingArea_Class is declared with no members at all, but 
then there is code for DrawingArea_Class::init().

The destructor calls some function called _destroy(), but I have no idea 
what's providing this. It doesn't seem to be Glib::Object or 
Glib::ObjectBase.

What's the point in the typedefs

typedef struct _GtkDrawingArea GtkDrawingArea;
typedef struct _GtkDrawingAreaClass GtkDrawingAreaClass;

that are already defined by the C code header?

Why is (GObject*) used instead of G_OBJECT()

Could someone take the time to explain how to write a gtkmm style 
language binding for my widget?

Thanks very much

Chris Seaton