Delivered-To: lablgtk at yquem.inria.fr
To: lablgtk at math.nagoya-u.ac.jp
From: Dawid Toton <d0 at wp.pl>
Date: Tue, 11 Sep 2007 04:06:33 +0200
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Message-ID: <fc4t7s$ue5$1 at sea.gmane.org>
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Subject: [Lablgtk] Low-level binding questions
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I'm still working on GtkPrintOperation. I have selected some most 
important questions for C-side of binding. Of course, I could find 
answers by myself, but I would took too much time. I've already spent 
several nights on reading LablGTK sources, and I'm really tired. So, 
forgive me if some of these problems have obvious solutions. :)

5) How is it translated to LablGKT: "GtkPrintOperation implements 
GtkPrintOperationPreview"
 GtkPrintOperationPreview is an interface, is special concern needed?

6) The following two objects are not said to be GObject descendants:
GtkPageSettings, GtkPageSetup
They have mainly setters&getters and really lot of them (but they are 
not labelled as properties in docs).
Can we take advatage of propcc in this case?
 
15) What classes need their  gtk_*_get_type function to be called? All 
GObject's descendants? Interfaces (like GtkPrintOperationPreview)?

16) When GTK function resturns potiner - have I always check it for 
null? What macros are intended for that?
  For example, in ml_gaction.c I read:
  ML_2 (gtk_action_group_get_action, GtkActionGroup_val, String_val, 
Val_GAnyObject)

  Where is the check for null pointer? Will it throw an exception? What 
should be done in cases, when a function is allowed to return null 
pointer in certain cases?

17) In ml_gobject.h :
 CAMLexport value Val_GObject (GObject *);
   
    Where is this function defined? I can't find it in LablGTK sources.
    
18) Is Val_GAnyObject suitable for converting any GObject to OCaml value?

Which one style is better:
ML_1(gtk_print_context_get_pango_fontmap,GtkPrintContext_val,Val_GAnyObject) 

ML_1(gtk_print_context_get_pango_fontmap,GtkPrintContext_val,Val_PangoFontMap)
  ?
 And what definition of Val_PangoFontMap should be?
 Maybe just #define Val_PangoFontMap Val_GAnyObject 

19) Is it safe to invoke caml_copy_double inside this macro? (I think it 
should be, but could't found any existing example.)
    
ML_1(gtk_print_context_get_width,GtkPrintContext_val,caml_copy_double) 
/* is it correct? */

Tkanks in advance.
Dawid Toton

PS. Poor parts of binding I've currently produced are here: 
http://www.toton.2-0.pl/OCaml/PrintOperation/

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