091. How to display a popup menu for GtkNotebook tab - Part 1?

Problem

You want to display a popup menu when user right-click on the tab of GtkNotebook as shown below:

How to display a popup menu for GtkNotebook tab - Part 1?


Solution


Sample Code

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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->popup_enable();  // note 1
$vbox->pack_start($notebook);

// add two tabs of GtkLabel
add_new_tab($notebook, new GtkLabel('Notebook 1'), 'Label #1');
add_new_tab($notebook, new GtkLabel('Notebook 2'), 'Label #2');

// add a third tab of GtkTextView
$buffer = new GtkTextBuffer();
$view = new GtkTextView();
$view->set_buffer($buffer);
$view->set_wrap_mode(Gtk::WRAP_WORD);
add_new_tab($notebook, $view, 'Tab 3 - TextView');

$window->show_all();
Gtk::main();

// add new tab
function add_new_tab($notebook, $widget, $tab_label) {
    $eventbox = new GtkEventBox();
    $label = new GtkLabel($tab_label);
    $eventbox->add($label);
    $label->show();
    $eventbox->connect('button-press-event', 'on_tab', $tab_label);
    $notebook->append_page($widget, $eventbox);

    $menu_label = new GtkLabel($tab_label);
    $menu_label->set_alignment(0,0); // note 3
    $notebook->set_menu_label($widget, $menu_label); // note 2
}

// function that is called when user click on tab
function on_tab($widget, $event, $tab_label) {
    if ($event->button!==1) return; // note 4
    echo "tab clicked = $tab_label\n";
}

?>

Output

As shown above.
 

Explanation

We make use of the code in How to know which tab of GtkNotebook is being clicked on? to setup a tabbed GtkNotebook.

What's new here:

  1. Enable popup.
  2. Set the menu label.
  3. Align the menu label to the left. Try commenting this line, and you will know what I mean.
  4. Only process left mouse click.

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