[Gtk-sharp-list] default empty protected constructors (please read this one instead of crapped previous one)

[Mike Kestner]

On 12 Jul 2002, Radek [ISO-8859-1] Doulík wrote:

> why do we have constructors like this one?
> 
> protected ScrolledWindow() : base(){}

If a class doesn't have a void ctor, we generate the above so that it can
be subclassed easily. I know this messes with customization possibilities,
because at one point I attempted to add a void Window ctor in a .custom
file.
 
> I would like to add new constructor to ScrolledWindow, but I can't do it
> yet because of mentioned protected one.
> 
> public ScrolledWindow () : this (new Adjustment (IntPtr.Zero), new Adjustment (IntPtr.Zero)) {}

I know I suggested this on IRC last night, but thinking about it further, it
won't work.  We need null handling to do this right.  I logged a bug for null
handling already, but you might want to make a note that ScrolledWindow is a 
good test case.  :)

Since providing simplified "default" ctors is likely to be a common 
customization, I'm thinking it might be worth adding a metadata category for
defining default parameter values for existing ctors.

Mike