#!/usr/bin/ruby

require 'gtk2'

Thread.abort_on_exception = true
Gtk.init

tv = Gtk::TreeView.new
renderer = Gtk::CellRendererText.new
column = Gtk::TreeViewColumn.new('', renderer, { :text => 0 })
tv.append_column(column)
tv.set_headers_visible(false)

ts = Gtk::TreeStore.new(String, String)
tv.set_model(ts)

iter_parent1 = ts.append(nil)
iter_parent1[0] = 'parent1'
iter_child1 = ts.append(iter_parent1)
iter_child1[0] = 'child1'

iter_parent2 = ts.append(nil)
iter_parent2[0] = 'parent2'
iter_child2 = ts.append(iter_parent2)
iter_child2[0] = 'child2'
iter_child3 = ts.append(iter_parent2)
iter_child3[0] = 'child3'

tv.expand_all

vb = Gtk::VBox.new
vb.add(tv)
vb.add(b = Gtk::Button.new('do'))
b.signal_connect('clicked') {
    ts.remove(ts.get_iter('0:0'))
}
main_window = Gtk::Window.new
main_window.add(vb)
main_window.signal_connect('delete-event') { Gtk.main_quit }
main_window.show_all

Gtk.main