236. How to setup a dialog box of radio buttons - Part 1?

Problem

The GtkDialog constructor example in the offical PHP-GTK2 documentation shows only how to get a yes/no response using a dialog box with GtkButtons.

Suppose you would like to get inputs from user using radio buttons in a dialog box as shown below:

How to setup a dialog box of radio buttons - Part 1?


Solution


Sample Code

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<?php
$window = new GtkWindow();
$window->set_title($argv[0]);
$window->set_size_request(400, 120);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());

// display title
$title = new GtkLabel("Set up Dialog Box of Radio Buttons - Part 1");
$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);
$title->set_justify(Gtk::JUSTIFY_CENTER);
$alignment = new GtkAlignment(0.5, 0, 0, 0);
$alignment->add($title);
$vbox->pack_start($alignment, 0, 0);
$vbox->pack_start(new GtkLabel(), 0, 0);

$vbox->pack_start($hbox = new GtkHBox(), 0);
$hbox->pack_start(new GtkLabel('Response: '), 0);
$hbox->pack_start($response = new GtkLabel(), 0);
$hbox->pack_start($button = new GtkButton('Get Response'), 0);
$button->connect('clicked', 'on_click');

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

function on_click() {
    setup_dialog();
}

function setup_dialog() {

    $dialog = new GtkDialog();

    $dialog->vbox->pack_start(new GtkLabel('Which platform are you using: '));

    $radio0 = setup_radio(null, 'radio button 0', '100'); // note 1
    $radio1 = setup_radio($radio0, 'Windows', 'win');
    $radio2 = setup_radio($radio0, 'Mac', 'mac');
    $radio3 = setup_radio($radio0, 'Linux', 'linux');

    // pack them inside vbox
    $dialog->vbox->pack_start($radio1, 0, 0); // note 2
    $dialog->vbox->pack_start($radio2, 0, 0); // note 2
    $dialog->vbox->pack_start($radio3, 0, 0); // note 2

    $dialog->vbox->pack_start($hbox2 = new GtkHBox());
    $button_ok = GtkButton::new_from_stock(Gtk::STOCK_OK);
    $button_ok->set_size_request(87, 33);
    $hbox2->pack_start(new GtkLabel());
    $hbox2->pack_start($button_ok, 0);
    $button_ok->connect('clicked', 'on_ok_button', $dialog);

    $dialog->set_has_separator(false);
    $dialog->action_area->set_size_request(-1, 1);
    $dialog->show_all();

    global $selected_radio, $selected_radio_value;
    $selected_radio = $selected_radio_value = '';
    $dialog->run();
    $dialog->destroy();

    global $response;
    $response->set_text("$selected_radio ($selected_radio_value)"); // note 5

}

function on_ok_button($button, $dialog) {
    $dialog->destroy(); // note 4
}

function setup_radio($radio_button_grp, $button_label, $button_value) {
    $radio = new GtkRadioButton($radio_button_grp, $button_label);
    $radio->connect('toggled', "on_toggle", $button_value);
    return $radio;
}

function on_toggle($radio, $value) { // note 3
    $label = $radio->child->get_label();
    $active = $radio->get_active();
    if ($active) {
        global $response, $selected_radio, $selected_radio_value;
        $selected_radio = $label;
        $selected_radio_value = $value;
    }
}

?>

Output

As shown above.
 

Explanation

We make use of the code from How to setup a dialog box - Part 4 - non integer response id? to manually set up the Yes/No buttons.

We also make use of the code from How to set up radio buttons with default all unselected? to process the selection of radio buttons.

What's new here:

  1. Set up the radio buttons.
  2. Pack the radio group into the dialog vbox.
  3. Process radio button toggle. Note that we save the selected radio item together with its value in the global variable $selected_radio and $selected_radio_value.
  4. When the user presses the OK button, we manually close the dialog.
  5. Echo the radio button selection.

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