115. How to setup and process checkboxes?

Problem

You want to setup checkboxes and find out the status of each checkbox as shown below:

How to setup and process checkboxes?


Solution


Sample Code

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<?php
$window = new GtkWindow();
$window->set_size_request(400, 240);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());

// display title
$title = new GtkLabel("Setup and process checkboxes");
$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);

// setup checkboxes
$checkbox1 = setup_checkbox('checkbox 1');
$checkbox2 = setup_checkbox('checkbox 2');
$checkbox3 = setup_checkbox('checkbox 3');

// pack them inside vbox
$vbox->pack_start($checkbox1, 0, 0);
$vbox->pack_start($checkbox2, 0, 0);
$vbox->pack_start($checkbox3, 0, 0);

// add a status area
$vbox->pack_start($status_area = new GtkLabel('Select the checkboxes'));

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

// function to simplify the display of grouped radio buttons
function setup_checkbox($label) {
    $checkbox = new GtkCheckButton($label); // note 1
    $checkbox->connect('toggled', "on_toggle"); // note 2
    return $checkbox;
}

// call-back function when user pressed a radio button
function on_toggle($checkbox) {
    global $status_area;
    $label = $checkbox->child->get_label();

    global $checkbox1, $checkbox2, $checkbox3;
    $status1 = $checkbox1->get_active() ? 'on' : 'off'; // note 3
    $status2 = $checkbox2->get_active() ? 'on' : 'off'; // note 3
    $status3 = $checkbox3->get_active() ? 'on' : 'off'; // note 3
    $status_area->set_text("Status of checkbox1: $status1\n
Status of checkbox2: $status2\n
Status of checkbox3: $status3");
}
?>

Output

As shown above.

 

Explanation

  1. Create the checkbox.
  2. Call on_toggle() when user checks the checkboxes.
  3. Get the status of each checkbox.

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