[Gtk2-perl-bugs] [Bug 573493] New: suggest call-out for GObject "constructor" func

[gnome-perl (bugzilla.gnome.org) <bug...@bu...>]

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  gnome-perl | Glib | Ver: unspecified
           Summary: suggest call-out for GObject "constructor" func
           Product: gnome-perl
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: Glib
        AssignedTo: gtk...@li...
        ReportedBy: us...@zi...
         QAContact: gtk...@li...
     GNOME version: Unspecified
   GNOME milestone: Unspecified


With Perl-Gtk 1.200 and Gtk 2.12.11 the foo.pl below gets an error

GLib-GObject-CRITICAL **: g_object_set_property: assertion `G_IS_OBJECT
(object)' failed at foo.pl line 12.

I believe GtkFileChooserDialog dispatches chooser properties like 'action' to
its child GtkFileChooserWidget, but that widget is only created by the
GtkFileChooserDialog "class->constructor" func and is thus not available in a
subclass INIT_INSTANCE.

It'd be good to have a way to run code in the constructor() stage of a
subclass.  The gobject docs say this is supposed to be rarely needed, but
cooperating with what a superclass like GtkFileChooserDialog does in a
constructor() would be a good use.

If the docs are to be believed constructor stuff normally runs bottom-up, ie.
the first thing you do is call to the superclass constructor.  In theory it
looks like maybe you could mangle the GObjectConstructParam pspec+values going
to the superclass, or something like that.  So maybe an arbitrarily chainable
scheme could be wanted, at least eventually.

The workaround I got to for a perl subclass of GtkFileChooserDialog was to make
my own new(), and set ChooserWidget properties in there. Of course subclassed
new() is outside the GObject mechanism, not reached by non-Perl constructor
code.  For example making such a subclass with the GtkBuilder mechanism doesn't
reach that new() code.


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