java-gnome-developer

RE: [Java-gnome-developer] Question concerning pixel graphics (fw d)

[Jeffrey M. <Jef...@Br...>]

> 
> What is the idea behind defining all Gdk classes boxed? 
> As I stated before, in gdk GdkPixmap and GdkBitmap are subclasses
> of GdkWindow, and can imho only used correctly if you have the
> methods of GdkWindow to operate on them.

Classes derived from GtkObject have certain runtime capabilities
that are utilized by the bindings.  Classes defined as "define-object"
use these capabilities.  Since GDK objects don't have this runtime
feature they cannot be defined as "define-object".  As I said
in my earlier email I haven't focused my efforts on the GDK objects.
I should be able to add inheritance to the "define-boxed" objects.
Give me a day or so.

> 
> As GdkColor is "boxed", I can't add new colors. Correct me if 
> I'm wrong,
> but I think that this way I could only change the default colors 
> that ".getStyle()" can give me?

I am not sure I understand your question.  You are correct that
the constructor for GdkColor is currently protected.  This is due
to the fact that there is no method in GDK to create a GdkColor
object (no gdk_color_new()) and therefore the code generator doesn't
know how to create a valid constructor.  It is possible to create a new 
constructor for the object and have it added to the generated code.
Perhaps GdkColor(int red, int green, int blue).  If you are not 
familiar with this process I could add it for you.

-Jeff

RE: [Java-gnome-developer] Question concerning pixel graphics (fw d)

[Jeffrey M. <Jef...@Br...>]

> This is an artifact of the object wrapping, not of Gdk types 
> per se. The
> problem is that the code that is generated assumes it is 
> always generated
> for Gtk bindings. The code assumes that. What should be done 
> is to have a
> property for all objects to defined "what type" of object 
> they are. That
> property would then be properly inherited, eg. for example something
> like..

That is essentially what I am doing with "define-object" and 
"define-boxed".  The concept of define-object and define-boxed 
were not created in this project but were created and used in
several other language bindings (as were define-enum and 
define-flags)to differentiate between GtkObject objects and 
standard structures that do not have runtime type resolution 
capabilities.  define-boxed is also used for GTK objects
that don't have runtime discovery capabilities like GtkStyle.
In Java-GNOME the define-object type has been my primary focus, 
not define-boxed.  I have recently added the ability to have 
methods on define-boxed and as I stated in a previous email I 
will soon add the ability to implement inheritance.


> Then, when code is generated which requires to access the 
> underlying type
> mechanism, GtkFoo and GdkFoo at their code generation time 
> have access to
> information of which type they are.

Re: [Java-gnome-developer] Question concerning pixel graphics (fw d)

[Markus F. <mar...@t-...>]

> as I stated in a previous email I
> will soon add the ability to implement inheritance.

I didn't saw that
---------------------------------------
(define-func gdk_draw_point
  none
  ((GdkPixmap window (object))
   (GdkGC gc)
   (int x)
   (int y)))
---------------------------------------
was what I wanted to add ;-)

By the way, my fractal generator is displaying Mandelbrot an Julia 
(and, btw, about five times faster than the same program in kylix :-)). 
Now I'm heading for a zoom function ;-)

MfG Markus

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