Simple Widget Layout
You learned yesterday about the idea of packing in Ruby/Tk. A widget needs to be packed before it can be seen, and the way a thing is packed determines its location within its parent.
The process is slightly different in Ruby/Gtk. Placement and visibility are achieved separately. Making things visible is very simple, because you can wait until everything in the window is set up, then invoke Gtk::Window#show_all. Placement is mostly a matter of understanding the roles of the Gtk::Bin, Gtk::Box, and Gtk::Table classes, so let's look at them next.
Bin Containers
A Bin is a special kind of container that has room for only one occupant. Descendant classes of Gtk::Bin include Gtk::Window and Gtk::Button. The Gtk::Bin#child method ...
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