Sample Code 409: How to disconnect a signal? |
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Written by kksou
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Tuesday, 15 January 2008 |
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Problem This is in response to Manar's post titled "How to disconnect an event?"
He has set up a button-press-event and want to disconnect the signal as shown below:
Solution
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| <?php
$window = new GtkWindow();
$window->set_size_request(400, 175);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());
// display title
$title = new GtkLabel("Disconnecting a signal");
$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);
$vbox->pack_start(new GtkLabel(), 0);
$vbox->pack_start(new GtkLabel('Click on the blue sqaure once. '.
'It will change to green.'), 0);
$signal_id = setup_colorbox('#0000ff', 'blue', $vbox); // note 1
$window->show_all();
Gtk::main();
function setup_colorbox($color, $label, $vbox) {
$hbox = new GtkHBox();
$hbox->set_size_request(30, 30);
$eventbox = new GtkEventBox();
$eventbox->add($hbox);
$eventbox->modify_bg(Gtk::STATE_NORMAL, GdkColor::parse($color));
$signal_id = $eventbox->connect('button-press-event',
'on_button_press'); // note 2
$hbox = new GtkHBox();
$vbox->pack_start($hbox, 0);
$hbox->pack_start(new GtkLabel());
$hbox->pack_start($eventbox, 0);
$hbox->pack_start(new GtkLabel());
return $signal_id;
}
function on_button_press($eventbox, $event) {
$eventbox->modify_bg(Gtk::STATE_NORMAL,
GdkColor::parse('#00ff00')); // note 3
global $signal_id;
$eventbox->disconnect($signal_id); // note 4
}
?>
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Explanation
- Set up the blue color box. Note that here we store the signal handler id in the variable
$signal_id.
- Set up the
button-press-event event. Don't forget to take note of the signal handler id.
- Change the color box from blue to green.
- Disconnect the
button-press-event signal.
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