How to register get_size etc when extends Gtk::CellRenderer in ruby

Hi, all

When i extends Gtk::CellRenderer from the gems of
http://rubygems.org/gems/gtk2 =EF=BC=88MS Windows), i got some error mess=
ages as
followed:
Gtk-CRITICAL **:gtk_cell_renderer_get_size: assertion
`GTK_CELL_RENDERER_GET_CLASS (cell)->get_size !=3D NULL' failed
Gtk-CRITICAL **:gtk_cell_renderer_render: assertion
`GTK_CELL_RENDERER_GET_CLASS (cell)->render !=3D NULL' failed

I think they must caused by the methods such as
gtk_cell_renderer_get_size of GTK+:
g_return_if_fail (GTK_IS_CELL_RENDERER (cell));
g_return_if_fail (GTK_CELL_RENDERER_GET_CLASS (cell)->get_size !=3D NULL)=
;

Maybe that means my custom cell renderer(Here as CellRendererRow, for
different cell renderer per row in the same column)'s get_size cann't be
recognized by GTK+.

I know i have use the 'type_register ' to register the CellRendererRow
to GTK+, but has there some way to register the methods such as
get_size, or we only need to name the method as do_get_size like
Python/GTK, but how to name the method in Ruby?

The followed is my source code(CellRendererRow.rb):


begin
  require 'rubygems'
rescue LoadError
end

require 'gtk2'
require 'glib2'

class CellRendererRow < Gtk::CellRenderer
  type_register

  install_property(GLib::Param::String.new(
                           "cell_type",
                           "cell_type",
                           "The type of the cell renderer",
                           "",
                           GLib::Param::READABLE|GLib::Param::WRITABLE))

  install_property(GLib::Param::String.new(
                       "cell_value",
                       "cell_value",
                       "The value of the cell renderer",
                       "",
                       GLib::Param::READABLE|GLib::Param::WRITABLE))

  PIXBUF   =3D "1"
  PROGRESS =3D "2"
  SPIN     =3D "3"
  TEXT     =3D "4"
  TOGGLE   =3D "5"

  attr_reader :cell_type, :cell_value

  def initialize(treeview)
    super()
    @treeview =3D treeview
    @comb_renderers =3D Hash.new
    @pixbuf =3D Gtk::CellRendererPixbuf.new
    @spin =3D Gtk::CellRendererSpin.new
    @text =3D Gtk::CellRendererText.new
    @toggle =3D Gtk::CellRendererToggle.new
  end

  def cell_type=3D (s)
    puts "cell type is: " + s
    @cell_type =3D s
  end

  def cell_value=3D (s)
    puts "cell value is: " + s

    @s =3D s
    case cell_type
      when  PIXBUF
        @pixbuf.pixbuf =3D s
      when  SPIN
        @spin.adjustment =3D s
      when  TEXT
        @text.text =3D s
      when  TOGGLE
        @toggle.active =3D s
      else
        cellrenderer =3D @comb_renderers.fetch(cell_type, @text)
        cellrenderer.text =3D s
    end
  end

  def renderer
    cellrenderer =3D case cell_type
                     when  PIXBUF
                       @pixbuf
                     when  SPIN
                       @spin
                     when  TEXT
                       @text
                     when  TOGGLE
                       @toggle
                     else  @comb_renderers.fetch(cell_type, @text)
                   end
  end

  def get_size(widget, cell_area)
    cellrenderer =3D renderer
    puts cellrenderer.class
    cellrenderer.get_size(widget, cell_area)
  end

  def render(window, widget, background_area, cell_area, expose_area,
flags)
    cellrenderer =3D renderer
    puts cellrenderer.class
    cellrenderer.render(window, widget, background_area, cell_area,
expose_area, flags)
 end

end

Attachments:
http://www.ruby-forum.com/attachment/8599/CellRendererRow.rb


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