Class to Widget

Desktop Ruby-Gnome 2
1

I’d like to learn how to convert a class to a widget. Is there someone
who can help me with this? The Ruby tutorial on this subject hasn’t
been written yet. I’d like to write that section using listbox.rb as an
example.

2

Your class should be a child of Gtk::TreeView, not Gtk::Widget. Updated
example attached.

Mathieu

3

Mathieu B. wrote:

Your class should be a child of Gtk::TreeView, not Gtk::Widget. Updated
example attached.

Mathieu
Thanks, Mathieu! That takes care of the reason it wouldn’t run. But,
does the fact that TreeView is a widget automatically make ListBox a
widget?

4

Alan L. wrote:

Mathieu B. wrote:

Thanks, Mathieu! That takes care of the reason it wouldn’t run. But,
does the fact that TreeView is a widget automatically make ListBox a
widget?

Yes it is because Gtk::TreeView is itself a Gtk::Widget (and otherwise
you wouldn’t be able to add your ListBox object to the window). Have a
look at the object hierarchy of a Gtk::TreeView:

http://ruby-gnome2.sourceforge.jp/hiki.cgi?Gtk%3A%3ATreeView

mathieu@mathieulaptop:~$ irb
irb(main):001:0> require “gtk2”
=> true
irb(main):002:0> Gtk::TreeView.ancestors
=> [Gtk::TreeView, Gtk::Container, Gtk::Widget, Atk::Implementor,
GLib::Interface, GLib::MetaInterface, Gtk::Object,
GLib::InitiallyUnowned, GLib::Object, GLib::Instantiatable, Object,
Kernel]
irb(main):003:0> tv = Gtk::TreeView.new
=> #<Gtk::TreeView:0xb67d37d0 ptr=0x8328120>
irb(main):004:0> tv.is_a? Gtk::Widget
=> true

HTH,
Mathieu