237. How to setup a dialog box of radio buttons - Part 2 - make sure user selects?

Problem

You have set up a popup dialog to prompt user to make a selection from a group of radio buttons in How to setup a dialog box of radio buttons - Part 1?

Suppose it is necessary that the user make a selection (e.g. software download for different platform). If the user did not make any selection, you will popup an alert message as shown below:

How to setup a dialog box of radio buttons - Part 2 - make sure user selects?


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\n".
    "Part 2 - user has to make a choice");
$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');
    $radio1 = setup_radio($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);
    $dialog->vbox->pack_start($radio2, 0, 0);
    $dialog->vbox->pack_start($radio3, 0, 0);

    $dialog->vbox->pack_start($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)");

}

function on_ok_button($button, $dialog) {
    global $selected_radio;
    if ($selected_radio=='') {
        alert("Please make a selection."); // note 1
    } else {
        $dialog->destroy(); // note 2
    }
}

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) {
    $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;
    }
}

// display popup alert box
function alert($msg) { // note 1
    $dialog = new GtkDialog('Alert', null, Gtk::DIALOG_MODAL);
    $dialog->set_position(Gtk::WIN_POS_CENTER_ALWAYS);
    $top_area = $dialog->vbox;
    $top_area->pack_start($hbox = new GtkHBox());
    $stock = GtkImage::new_from_stock(Gtk::STOCK_DIALOG_WARNING,
        Gtk::ICON_SIZE_DIALOG);
    $hbox->pack_start($stock, 0, 0);
    $hbox->pack_start(new GtkLabel($msg));
    $dialog->add_button(Gtk::STOCK_OK, Gtk::RESPONSE_OK);
    $dialog->set_has_separator(false);
    $dialog->show_all();
    $dialog->set_keep_above(1);
    $dialog->run();
    $dialog->destroy();
}

?>

Output

As shown above.
 

Explanation

The above example is an extension of the code from How to setup a dialog box of radio buttons - Part 1?

We also make use of the code from How to display a popup alert for required fields - Part 1? to display the alert box.

What's new here:

  1. If there is no selection, we popup an alert box.
  2. If the user has already made a selection, we manually close the dialog.

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