Sample Code 487: How to hide and unhide tabs in GtkNotebook? |
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Written by kksou
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Thursday, 01 May 2008 |
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Problem You have set up a GtkNotebook with multiple tabs.
Suppose you would like to allow the users to hide and unhide tabs as shown below:
Solution
- The "trick" in getting this to work is that: when you hide the top-level widget contained in a tab of a GtkNotebook, the tab will automatically hide itself too!
- To hide a widget, use the method GtkWidget::set_visible(false). To unhide it, set it to
true.
Sample Code 1
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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());
// setup notebook
$notebook = new GtkNotebook();
$notebook->connect('switch-page', 'on_switch');
$vbox->pack_start($notebook);
// stores the names of the tab labels
$tab_labels = array('Label #1', 'Label #2', 'Tab 3 - TextView');
// a global array that stores the widgets residing in each tab
$widgets = array();
$widgets[0] = new GtkLabel("Notebook 1");
$widgets[1] = new GtkLabel("Notebook 2");
// add a third tab of GtkTextView
$buffer = new GtkTextBuffer();
$view = new GtkTextView();
$view->set_buffer($buffer);
$view->set_wrap_mode(Gtk::WRAP_WORD);
$widgets[2] = $view;
// add two tabs of GtkLabel
add_new_tab($notebook, $widgets[0]);
add_new_tab($notebook, $widgets[1]);
add_new_tab($notebook, $widgets[2]);
$window->show_all();
Gtk::main();
// add new tab
function add_new_tab($notebook, $widget) {
global $tab_labels;
static $page_num=0;
$tab_label = $tab_labels[$page_num];
$eventbox = new GtkEventBox();
$label = new GtkLabel($tab_label);
$eventbox->add($label);
$label->show();
$eventbox->connect('button-press-event', 'on_tab', $page_num);
$notebook->append_page($widget, $eventbox);
$menu_label = new GtkLabel($tab_label);
$menu_label->set_alignment(0,0);
$notebook->set_menu_label($widget, $menu_label);
global $tab_widget;
static $page=0;
$tab_widget[$page] = $widget;
++$page;
++$page_num;
}
// function that is called when user click on tab
function on_tab($widget, $event, $page_num) {
global $tab_labels;
$tab_label = $tab_labels[$page_num];
if ($event->button==1) {
echo "tab clicked = $tab_label (page $page_num)\n";
return false;
}
if ($event->button==3) {
popup_menu($page_num);
return true;
}
return false;
}
function on_switch($notebook) {
$switched_from = $notebook->get_current_page();
if ($switched_from==-1) return;
global $tab_widget;
$tab_label = $notebook->get_tab_label($tab_widget[$switched_from]);
$tab_label_text = $tab_label->child->get_text();
echo "You have switched from: $tab_label_text (page $switched_from)\n";
}
function popup_menu($page_num) {
global $menu, $notebook;
//define the popup menu
$num_pages = $notebook->get_n_pages();
$menu_definition = array();
for ($i=0; $i<$num_pages; ++$i) {
$widget = $notebook->get_nth_page($i);
$tab_label = $notebook->get_tab_label($widget);
$tab_label_text = $tab_label->child->get_text();
$menu_definition[] = $tab_label_text;
}
$menu_definition = array_merge($menu_definition, array('<hr>', 'hide this tab', 'unhide all')); // note 1
$menu = show_popup_menu($menu_definition, $page_num); // show the popup menu
}
// show popup menu
function show_popup_menu($menu_definition, $page_num) {
$menu = new GtkMenu();
$menu_id = 0;
foreach($menu_definition as $menuitem_definition) {
if ($menuitem_definition=='<hr>') {
$menu->append(new GtkSeparatorMenuItem());
} else {
$menu_item = new GtkMenuItem($menuitem_definition);
$menu->append($menu_item);
$menu_item->connect('activate', 'on_popup_menu_select', $menu_id, $page_num);
++$menu_id;
}
}
$menu->show_all();
$menu->popup();
}
// process popup menu item selection
function on_popup_menu_select($menu_item, $menu_id, $page_num) {
global $notebook;
global $tab_labels;
$item = $menu_item->child->get_label();
echo "popup menu selected: $item ($menu_id / $page_num)\n";
if ($menu_id<3) {
$notebook->set_current_page($menu_id); // change tab
echo "New tab selected: $item (page $menu_id)\n";
} elseif ($menu_id==3) {
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Explanation The code above is based on the code from How to rename tab label in GtkNotebook?
What's new here:
- Set up the hide/unhide popup menu.
- Hide the selected tab.
- Unhide all tabs.
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