288. How to setup a dialog box of checkboxes - 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 checkboxes in a dialog box as shown below:

How to setup a dialog box of checkboxes - 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 Checkboxes - Part 1\n");
$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->set_title('');

    $dialog->vbox->pack_start(new GtkLabel("Which platforms are you using: \n".
    "(You can select more than one)"));

    global $checkbox1, $checkbox2, $checkbox3;
    $checkbox1 = setup_checkbox('Windows'); // note 1
    $checkbox2 = setup_checkbox('Mac');
    $checkbox3 = setup_checkbox('Linux');

    // pack them inside vbox
    $dialog->vbox->pack_start($checkbox1, 0, 0); // note 2
    $dialog->vbox->pack_start($checkbox2, 0, 0);
    $dialog->vbox->pack_start($checkbox3, 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, $selections;
    $response->set_text(implode(', ', $selections)); // note 7
}

function on_ok_button($button, $dialog) {
    global $checkbox1, $checkbox2, $checkbox3;
    $status1 = $checkbox1->get_active()?$checkbox1->get_label(): ''; // note 3
    $status2 = $checkbox2->get_active()?$checkbox2->get_label(): '';
    $status3 = $checkbox3->get_active()?$checkbox3->get_label(): '';

    global $selections;
    $selections = array();
    if ($status1!='') $selections[] = $status1; // note 4
    if ($status2!='') $selections[] = $status2;
    if ($status3!='') $selections[] = $status3;

    if (count($selections)==0) {
        alert("Please make a selection."); // note 5
    } else {
        $dialog->destroy(); // note 6
    }
}

function setup_checkbox($label) {
    $checkbox = new GtkCheckButton($label);
    $checkbox->connect('toggled', "on_toggle");
    return $checkbox;
}

function on_toggle($checkbox) {
    $label = $checkbox->get_label();
    $active = $checkbox->get_active();
    if ($active) echo "You have selected: $label\n";
}

// 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

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 setup and process checkboxes? to process the selection of checkboxes.

What's new here:

  1. Set up the checkboxes.
  2. Pack the checkboxes into the dialog vbox.
  3. Get the status of each checkbox.
  4. If the checkbox is selected, add this to the array $selections.
  5. Popup an alert if the user didn't make any selections.
  6. Manually close the dialog.
  7. Echo the checkbox selection.

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