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http://bugzilla.gnome.org/show_bug.cgi?id=573493
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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