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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- Note that this is only 70% of the sample code. You have to be a registered member to see the entire sample code. Please login or register.
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- Have some doubt about the registration? Please read this forum article.
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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