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by kksou



Sample Code 427: How to set up check items in menu?
Written by kksou   
Wednesday, 30 January 2008
Problem

You want to set up check items in menus as shown below:

How to set up check items in menu?


Solution

Sample Code
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<?php
$window = new GtkWindow();
$window->set_title($argv[0]);
$window->set_size_request(400, 150);
$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('_New|N', '_Open|O', '_Close|C', '<hr>', '_Save|S', 'Save _As','<hr>', 'E_xit'),
    '_Edit' => array('Cu_t|X', '_Copy|C', '_Paste|V', '<hr>', 'Select _All|A', '<hr>', '_Undo|Z','_Redo|Y'),
    '_Test' => array('Test_1|1', 'Test_2|2', 'Test_3|3', '<hr>',
                array('Selection 1', 'Selection 2', 'Selection 3'), '<hr>',
                '<checkitem>Test_4|4', '<checkitem>Test_5|5', // note 1
                '<checkitem>Test_6|6') // note 1
);
$menu = new Menu($vbox, $menu_definition, $accel_group);

// display title
$title = new GtkLabel("Set up check items in menu");
$title->modify_font(new PangoFontDescription("Times New Roman Italic 10"));
$title->modify_fg(Gtk::STATE_NORMAL, GdkColor::parse("#0000ff"));
$vbox->pack_start($title);

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

// class Menu
class Menu {
    var $prev_keyval = 0;
    var $prev_state = 0;
    var $prev_keypress = '';
    function Menu($vbox, $menu_definition, $accel_group) {
        $this->menu_definition = $menu_definition;
        $menubar = new GtkMenuBar();
        $vbox->pack_start($menubar, 0, 0);
        foreach($menu_definition as $toplevel => $sublevels) {
            $top_menu = new GtkMenuItem($toplevel);
            $menubar->append($top_menu);
            $menu = new GtkMenu();
            $top_menu->set_submenu($menu);

            // let's ask php-gtk to tell us when user press the 2nd Alt key
            $menu->connect('key-press-event', array(&$this, 'on_menu_keypress'), $toplevel);

            foreach($sublevels as $submenu) {
                if (strpos("$submenu", '|') === false) {
                    $accel_key = '';
                } else {
                    list($submenu, $accel_key) = explode('|', $submenu);
                }

                if (is_array($submenu)) { // set up radio menus
                    $i=0;
                    $radio[0] = null;
                    foreach($submenu as $radio_item) {
                        $radio[$i] = new GtkRadioMenuItem($radio[0], $radio_item);
                        $radio[$i]->connect('toggled', array(&$this, "on_toggle"));
                        $menu->append($radio[$i]);
                        ++$i;
                    }
                    $radio[0]->set_active(1); // select the first item
                } else {
                    if ($submenu=='<hr>') {
                        $menu->append(new GtkSeparatorMenuItem());
                    } else {
                        $submenu2 = str_replace('_', '', $submenu);
                        $submenu2 = str_replace(' ', '_', $submenu2);
                        $stock_image_name = 'Gtk::STOCK_'.strtoupper($submenu2);
                        if (defined($stock_image_name)) {
                            $menu_item = new GtkImageMenuItem(constant($stock_image_name));
                        } else {
                            if (preg_match("/^<checkitem>(.*)/", $submenu, $matches)) { // note 2
                                $menu_item = new GtkCheckMenuItem($matches[1]); // note 3
                                $menu_item->connect('toggled', array(&$this, "on_toggle")); // note 4
                            } else {
                                $menu_item = new GtkMenuItem($submenu);
                            }
                        }
                        if ($accel_key!='') {
                            $menu_item->add_accelerator("activate",
                                $accel_group, ord($accel_key), Gdk::CONTROL_MASK, 1);
                        }

                        $menu->append($menu_item);
                        $menu_item->connect('activate', array(&$this, 'on_menu_select'));
                        $this->menuitem[$toplevel][$submenu] = $menu_item;
                    }
                }
            }
        }
    }

    // process radio menu selection
    function on_toggle($radio) { // note 4
        $label = $radio->child->get_label();
        $active = $radio->get_active();
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Explanation

The above code is based on that of How to set up menu and radio menu - Part 4 - allow Alt F Alt N?

What's new here:

  1. Note how we define check items in the menu definitions.
  2. Check whether this is a check item.
  3. Create the check menu item.
  4. Register the toggled signal on the check menu item.
  5. Toggle the check menu item. Note that we make use of the same signal hanlder as that of the radio menu items.

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