#! /usr/bin/perl
use warnings;
use strict;
use Gtk2 '-init';
use Glib qw/TRUE FALSE/;

#standard window creation, placement, and signal connecting
my $window = Gtk2::Window->new('toplevel');
$window->signal_connect('delete_event' => sub { Gtk2->main_quit; });
$window->set_border_width(5);
$window->set_position('center_always');

#this vbox will geturn the bulk of the gui
my $vbox = &ret_vbox();

#add and show the vbox
$window->add($vbox);
$window->show();

#our main event-loop

Gtk2->main();


sub ret_vbox {

my $vbox = Gtk2::VBox->new(FALSE,5);

#create a scrolled window that will host the treeview
my $sw = Gtk2::ScrolledWindow->new (undef, undef);
$sw->set_shadow_type ('etched-out');
$sw->set_policy ('automatic', 'automatic');
#This is a method of the Gtk2::Widget class,it will force a minimum
#size on the widget. Handy to give intitial size to a
#Gtk2::ScrolledWindow class object
$sw->set_size_request (300, 300);
#method of Gtk2::Container
$sw->set_border_width(5);

#this is one of the provided base Gtk2::TreeModel classes.
my $tree_store = Gtk2::TreeStore->new(qw/Glib::String/);

#fill it with arbitry data
my @data = qw(q e r g x u b k p a v );
foreach (@data) {

my $parent_nr = $_;
#the iter is a pointer in the treestore. We
#use to add data.
my $iter = $tree_store->append(undef);
$tree_store->set ($iter,0 => "Parent $parent_nr");

foreach (1..3){
#here we append child iters to the parent iter
#and add data to those chils iters.
my $iter_child = $tree_store->append($iter);
$tree_store->set ($iter_child,0 => "Child $_ of Parent $parent_nr");
}
}

#this will create a treeview, specify $tree_store as its model
my $tree_view = Gtk2::TreeView->new($tree_store);


#create a Gtk2::TreeViewColumn to add to $tree_view
my $tree_column = Gtk2::TreeViewColumn->new();

$tree_column->set_title ("Click to sort");

#create a renderer that will be used to display info
#in the model
my $renderer = Gtk2::CellRendererText->new;
#add this renderer to $tree_column. This works like a Gtk2::Hbox
# so you can add more than one renderer to $tree_column
$tree_column->pack_start ($renderer, FALSE);

# set the cell "text" attribute to column 0
#- retrieve text from that column in treestore
# Thus, the "text" attribute's value will depend on the row's value
# of column 0 in the model($treestore),
# and this will be displayed by $renderer,
# which is a text renderer
$tree_column->add_attribute($renderer, text => 0);

#add $tree_column to the treeview
$tree_view->append_column ($tree_column);

# make it searchable
$tree_view->set_search_column(0);

# Allow sorting on the column
$tree_column->set_sort_column_id(0);

# Allow drag and drop reordering of rows
$tree_view->set_reorderable(TRUE);

$sw->add($tree_view);


$vbox->pack_start($sw,TRUE,TRUE,0);
$vbox->show_all();
return $vbox;
}