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
- When you set up a signal with GObject::connect(), PHP-GTK2 will return you a signal handler id. Store this in a variable.
- When you want to disconnect the signal, use GObject::disconnect($signal_handler_id), where
$signal_handler_id
is the signal handler id you have stored earlier.
Sample Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 45 46 49 50 51 52 53 54 | <?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 } ?> |
Output
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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