Sample Code 36: How to use GtkCellRendererCombo - Part 3 - process user selection?
Written by kksou   
Tuesday, 26 September 2006
Problem

You have set up a combo box in a GtkTreeView in Part 1, and processed the combo box when user selects from the list in Part 2.

Now let's wrap up GtkCellRendererCombo with alternate row color and processing of user selection.

How to use GtkCellRendererCombo - Part 3 - process user selection?


Solution

Sample Code
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<?php
$window = new GtkWindow();
$window->set_size_request(400, 200);
$window->connect_simple('destroy', array('Gtk','main_quit'));

$window->add($vbox = new GtkVBox());

// display title
$title = new GtkLabel("Using GtkCellRendererCombo - Part 3\n".
"             process user selection");
$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(), 0, 0);

// the 2D table
$data = array(
array('row0', 'item 1', 2, 3.1),
array('row1', 'item 4', 5, 6.21),
array('row2', 'item 7', 8, 9.36),
array('row3', 'item 10', 11, 12.4),
array('row4', 'item 21', 14, 15.5),
array('row5', 'item 36', 17, 18.6),
array('row6', 'item 42', 20, 21.73));

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
    if (defined("GObject::TYPE_STRING")) {
        $model = new GtkListStore(GObject::TYPE_STRING, GObject::TYPE_STRING,
                    GObject::TYPE_LONG, GObject::TYPE_DOUBLE, GObject::TYPE_STRING);
    } else {
        $model = new GtkListStore(Gtk::TYPE_STRING, Gtk::TYPE_STRING,
                    Gtk::TYPE_LONG, Gtk::TYPE_DOUBLE, Gtk::TYPE_STRING);
    }
    $field_header = array('Row #', 'Description', 'Qty', 'Price');

    // creates the view to display the list store
    $view = new GtkTreeView($model);
    $scrolled_win->add($view);

    // creates columns
    for ($col=0; $col<count($field_header); ++$col) {
        $cell_renderer = new GtkCellRendererText();
        $column = new GtkTreeViewColumn($field_header[$col],
            $cell_renderer, 'text', $col);
        $column->set_cell_data_func($cell_renderer, "format_col", $col); // note 1
        $view->append_column($column);
    }

    // setup combo box
    $cell_renderer = new GtkCellRendererCombo();
    if (defined("GObject::TYPE_STRING")) {
        $category = new GtkListStore(GObject::TYPE_STRING);
    } else {
        $category = new GtkListStore(Gtk::TYPE_STRING);
    }
    $list = array('grp 1', 'grp 2', 'grp 3', 'grp 4');
    foreach($list as $choice) {
        $category->append(array($choice));
    }
    $cell_renderer->set_property('model', $category);
    $cell_renderer->set_property('text-column', 0);
    $cell_renderer->set_property('editable', true);
    $cell_renderer->connect('edited', 'on_combo', $model);

    $column = new GtkTreeViewColumn('Category', $cell_renderer, 'text', 4);
    $column->set_cell_data_func($cell_renderer, "format_col", 4);
    $view->append_column($column);

    $selection = $view->get_selection();
    $selection->connect('changed', 'on_selection'); // note 2
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Explanation
  • Set up user-defined cell-display function.
  • Register signal 'changed' on the GtkTreeSelection.
  • Display alternate row colors.
  • Process selection.

For details please refer to:


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