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Problem A GtkAction is usually used together with GtkUIManager to manage menus and toolbar items. But it can actually be used with almost any standard GtkWidget.
We've seen how to use GtkAction with GtkButton in How to activate deactivate a bunch of GtkButtons using GtkAction and GtkActionGroup?
In this example, we will use GtkAction with GtkLabel. It is useful when you need to hide or unhide a group of related GtkLabels as shown below:
Solution
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| <?php
$window = new GtkWindow();
$window->set_size_request(400, 280);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());
// display title
$title = new GtkLabel(" Hide/unhide a bunch of GtkLabels\n".
"using GtkAction and GtkActionGroup");
$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);
$vbox->pack_start(new GtkLabel(), 0, 0);
setup_menu($vbox);
setup_numbers($vbox);
$window->show_all();
Gtk::main();
function setup_numbers($vbox) {
function setup_buttons($label_text, $vbox, $action_grp) {
$label = new GtkLabel($label_text);
$vbox->pack_start($hbox = new GtkHBox(), 0);
$hbox->pack_start($label, 0);
$action = new GtkAction($label_text, '_'.$label_text, '', ''); // note 3
$action->connect_proxy($label); // note 3
$action_grp->add_action($action); // note 4
return $label;
}
$vbox->pack_start($hbox = new GtkHBox());
$hbox->pack_start($vbox1 = new GtkVBox());
$hbox->pack_start($vbox2 = new GtkVBox());
global $odd_nummbers_action_grp;
$odd_nummbers_action_grp = new GtkActionGroup("OddActions"); // note 1
global $buttons;
$vbox1->pack_start($hbox1 = new GtkHBox, 0);
$hbox1->pack_start($label = new GtkLabel('Odd'), 0);
$label->modify_font(new PangoFontDescription("Arial Bold"));
for ($i=1; $i<=10; $i+=2) {
$buttons[$i] = setup_buttons($i, $vbox1, $odd_nummbers_action_grp);
}
global $even_nummbers_action_grp;
$even_nummbers_action_grp = new GtkActionGroup("EvenActions"); // note 2
$vbox2->pack_start($hbox2 = new GtkHBox, 0);
$hbox2->pack_start($label = new GtkLabel('Even'), 0);
$label->modify_font(new PangoFontDescription("Arial Bold"));
for ($i=2; $i<=10; $i+=2) {
$buttons[$i] = setup_buttons($i, $vbox2, $even_nummbers_action_grp);
}
}
function setup_menu($vbox) {
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) {
global $status_area;
$label = $radio->child->get_label();
$active = $radio->get_active();
global $odd_nummbers_action_grp, $even_nummbers_action_grp;
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Explanation
- Create the odd-number action group.
- Create the even-number action group.
- Create a new action and binds the GtkLabel to the action.
- Add the action to the action group.
- Turn the respective group visible and not visible based on the user selection.
- Hide all the odd numbers.
Note
Compare the above code with that of How to activate deactivate a bunch of GtkButtons using GtkAction and GtkActionGroup? The two are very similar, except one uses GtkLabels, and the other uses GtkButtons.
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