Sample Code 142: How to sort treeview using GtkTreeModelSort?
Written by kksou   
Sunday, 14 January 2007
Problem

You would like to sort treeview data using GtkTreeModelSort as shown below:

How to sort treeview using GtkTreeModelSort?


Solution

We can sort a tree model using GtkTreeModelSort.


Sample Code
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<?php
$window = new GtkWindow();
$window->set_size_request(400, 312);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());
$accel_group = new GtkAccelGroup();
$window->add_accel_group($accel_group);

// define menu definition
$menu_definition = array(
    '_File' => array('_Quit|Q'),
    '_Sort By' => array('Row#|0', 'Description|1', 'Qty|2', 'Price|3')
);
setup_menu($vbox, $menu_definition);

// display title
$title = new GtkLabel("Sort Treeview using GtkTreeModelSort");
$title->modify_font(new PangoFontDescription("Times New Roman Italic 10"));
$title->modify_fg(Gtk::STATE_NORMAL, GdkColor::parse("#0000ff"));
$title->set_size_request(-1, 40);
$vbox->pack_start($title, 0, 0);

$vbox->pack_start(new GtkLabel("Ctrl-0: sort by row #\n".
"Ctrl-1: sort by Description\n".
"Ctrl-2: sort by Qty\n".
"Ctrl-3: sort by Price"), 0, 0);
$vbox->pack_start(new GtkLabel(), 0, 0);

// the 2D table
$data = array(
array('row0', 'item 42', 2, 3.1, 1),
array('row1', 'item 36', 20, 6.21, 1),
array('row2', 'item 21', 8, 9.36, 1),
array('row3', 'item 10', 11, 12.4, 1),
array('row4', 'item 7', 5, 15.5, 1),
array('row5', 'item 4', 17, 18.6, 1),
array('row6', 'item 3', 20, 21.73, 1));

display_table ($vbox, $data);

$window->show_all();
Gtk::main();

function display_table($vbox, $data) {

    // Set up a scroll window
    $scrolled_win = new GtkScrolledWindow();
    $scrolled_win->set_policy( Gtk::POLICY_AUTOMATIC,
        Gtk::POLICY_AUTOMATIC);
    $vbox->pack_start($scrolled_win);

    // Creates the list store
    global $model, $view;
    if (defined("GObject::TYPE_STRING")) {
        $model = new GtkListStore(GObject::TYPE_STRING, GObject::TYPE_STRING,
                    GObject::TYPE_LONG, GObject::TYPE_DOUBLE, GObject::TYPE_BOOLEAN);
    } else {
        $model = new GtkListStore(Gtk::TYPE_STRING, Gtk::TYPE_STRING,
                    Gtk::TYPE_LONG, Gtk::TYPE_DOUBLE, Gtk::TYPE_BOOLEAN);
    }
    $field_header = array('Row #', 'Description', 'Qty', 'Price');
    $field_justification = array(0.0, 0.0, 0.5, 1.0);

    // setup GtkTreeModelSort
    $modelsort = new GtkTreeModelSort($model);  // note 1
    $modelsort->set_sort_column_id(0, Gtk::SORT_ASCENDING); // note 2
    
    // Creates the view to display the list store
    $view = new GtkTreeView($modelsort); // note 3
    $scrolled_win->add($view);

    // Creates the columns
    for ($col=0; $col<count($field_header); ++$col) {
        $cell_renderer = new GtkCellRendererText();
        $cell_renderer->set_property("xalign", $field_justification[$col]);
        $column = new GtkTreeViewColumn($field_header[$col],
            $cell_renderer, 'text', $col);
        $column->set_alignment($field_justification[$col]);
        $column->set_sort_column_id($col);

        // set the header font and color
        $label = new GtkLabel($field_header[$col]);
        $label->modify_font(new PangoFontDescription("Arial Bold"));
        $label->modify_fg(Gtk::STATE_NORMAL, GdkColor::parse("#0000FF"));
        $column->set_widget($label);
        $label->show();

        // setup self-defined function to display alternate row color
        $column->set_cell_data_func($cell_renderer, "format_col", $col);
        $view->append_column($column);
    }

    // pupulates the data
    for ($row=0; $row<count($data); ++$row) {
        $values = array();
        for ($col=0; $col<count($data[$row]); ++$col) {
            $values[] = $data[$row][$col];
        }
        $model->append($values);
    }

    // setup selection
    $selection = $view->get_selection(); // get the selection associated with the view
    $selection->connect('changed', 'on_selection');

}

// self-defined function to format the price column
function format_col($column, $cell, $model, $iter, $col_num) {
    $path = $model->get_path($iter); // get the current path
    $row_num = $path[0]; // get the row number
    if ($col_num==3) {
        $amt = $model->get_value($iter, 3);
        $cell->set_property('text', '$'.number_format($amt,2));
    }
    $row_color = ($row_num%2==1) ? '#dddddd' : '#ffffff';
    $cell->set_property('cell-background', $row_color);
}

// the function that is called when user selects a row
function on_selection($selection) {
    list($model, $iter) = $selection->get_selected();
    if ($iter==NULL) return;
    $desc = $model->get_value($iter, 1);
    $qty = $model->get_value($iter, 2);
    $price = $model->get_value($iter, 3);
    print "You have selected $desc: $qty ($price)\n";
}

// setup menu
function setup_menu($vbox, $menus) {
    global $accel_group;
    $menubar = new GtkMenuBar();
    $vbox->pack_start($menubar, 0, 0);
    foreach($menus as $toplevel => $sublevels) {
        $menubar->append($top_menu = new GtkMenuItem($toplevel));
        $menu = new GtkMenu();
        $top_menu->set_submenu($menu);
        foreach($sublevels as $submenu) {
            if (strpos("$submenu", '|') === false) {
                $accel_key = '';
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Explanation

The above code is based on How to display a 2D array in GtkTreeView - Part 5 - get user selection?.

We also make use of the codes in How to set up menu and radio menu - Part 3 - add accelerators? to display a menu with accelerators so that we use Ctrl-0, Ctrl-1, Ctrl-2 and Ctrl-3 to switch between the four views.

What's new here:

  1. Create a new GtkTreeModelSort.
  2. Set the initial sort order to the first column (row #).
  3. Attach the GtkTreeModelSort to the treeview.
  4. Set the sort column accordingly based on user selection.

Note

If you sort by the column "item description", you will notice that "item 36" comes before "item 4".

If you would like "item 4" to come before "item 36", please refer to How to sort treeview using self defined sort function?


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