[Gtk2-perl-bugs] [Bug 570792] New: Support interface properties when subclassing

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

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  gnome-perl | Glib | Ver: unspecified
           Summary: Support interface properties when subclassing
           Product: gnome-perl
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: Glib
        AssignedTo: gtk...@li...
        ReportedBy: kaf...@gm...
         QAContact: gtk...@li...
     GNOME version: Unspecified
   GNOME milestone: Unspecified


When subclasses want to implement an interface that contains properties[1],
there appear to be two options[2]:

• add new properties with matching names; or
• use g_object_class_override_property.

I think Glib::Type->register should use the second approach when it encounters
a subclass which wants to implement an interface with a property and which
doesn't have its own property with the same name.  This means that Perl
subclasses implementing some interface will get calls to their [GS]ET_PROPERTY
for these properties automatically.

When a subclass is registered which implements some interface with properties
but doesn't override one of the properties, a critical warning is printed:

  GLib-GObject-CRITICAL **: Object class Switchable doesn't implement property  
  'orientation' from interface 'GtkOrientable'

In gtk+, there appear to be four interfaces with properties: GtkActivatable,
GtkFileChooser, GtkOrientable, and GtkRecentChooser.

[1]
<http://library.gnome.org/devel/gobject/2.19/howto-interface-properties.html>
[2]
<http://library.gnome.org/devel/gobject/2.19/gobject-The-Base-Object-Type.html#g-object-interface-install-property>


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