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Problem This article extends How to set up menu and radio menu - Part 3 - add accelerators? to allow display of multiple levels of submenus as shown below:
Solution
Usage:
- Display a menu with sub-menus is just a one-liner:
$menu = new Menu($vbox, $menu_definition)
- To display just one level of menu, use the following menu_definition:
'M1' => array('M1.1', 'M1.2', 'M1.3')
- Suppose
M1.3 has submenus, use the following:
'M1' => array('M1.1', 'M1.2',
'M1.3' => array('M1.3.1', 'M1.3.2', 'M1.3.3'))
- Suppose
M1.3.3 has another level of submenus, use the following:
'M1' => array('M1.1', 'M1.2',
'M1.3' => array('M1.3.1', 'M1.3.2',
'M1.3.3' => array('M1.3.3.1', 'M1.3.3.2', 'M1.3.3.3')))
Sample Code 1
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| <?php
$window = new GtkWindow();
$window->set_size_request(400, 150);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());
$accel_group = new GtkAccelGroup();
$window->add_accel_group($accel_group);
// define menu definition
$menu_definition = array( // note 1
'_File' => array('_New|N', '_Open|O', '_Close|C', '<hr>',
'_Save|S', 'Save _As','<hr>','E_xit'),
'_Edit' => array('_Undo|Z','_Redo|Y','<hr>',
'Cu_t|X', '_Copy|C', '_Paste|V', '<hr>',
'_Select' => array('_All|A', '_Paragraph', '_Word|W'),
'_Go to' => array('_Line', '_Bookmark',
'Level 2'=>array('Level 2.1','Level 2.2',
'Level 2.3' => array('Level 2.3.1','Level 2.3.2','Level 2.3.3')))
),
);
$menu = new Menu($vbox, $menu_definition);
// display title
$title = new GtkLabel("Menu and RadioMenuItem\n".
"Part 5 - Add Submenus");
$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);
$title->set_justify(Gtk::JUSTIFY_CENTER);
$alignment = new GtkAlignment(0.5, 0, 0, 0);
$alignment->add($title);
$vbox->pack_start($alignment, 0, 0);
$vbox->pack_start(new GtkLabel(), 0, 0);
$window->show_all();
Gtk::main();
// class Menu
class Menu {
var $prev_keyval = 0;
var $prev_state = 0;
var $prev_keypress = '';
function Menu($vbox, $menu_definition) {
$this->menu_definition = $menu_definition;
$menubar = new GtkMenuBar();
$vbox->pack_start($menubar, 0, 0);
foreach($menu_definition as $toplevel => $sublevels) {
$top_menu = new GtkMenuItem($toplevel);
$menubar->append($top_menu);
$this->setup_submenu($top_menu, $sublevels, $toplevel); // note 2
}
}
function setup_submenu($parent_menu, $sublevels, $toplevel) {
global $accel_group;
$menu = new GtkMenu();
$parent_menu->set_submenu($menu);
foreach($sublevels as $k=>$submenu) {
if (strpos("$submenu", '|') === false) {
$accel_key = '';
} else {
list($submenu, $accel_key) = explode('|', $submenu);
}
if (is_array($submenu)) { // set up radio menus
if (preg_match("/^\d+$/", $k)) {
// it's a toggle
$i=0;
$radio[0] = null;
foreach($submenu as $radio_item) {
$radio[$i] = new GtkRadioMenuItem($radio[0], $radio_item);
$radio[$i]->connect('toggled', array(&$this, "on_toggle"));
$menu->append($radio[$i]);
++$i;
}
$radio[0]->set_active(1); // select the first item
} else {
// it's a submenu
$menu_item = new GtkMenuItem($k);
if ($accel_key!='') {
$menu_item->add_accelerator("activate",
$accel_group, ord($accel_key), Gdk::CONTROL_MASK, 1);
}
$menu->append($menu_item);
$menu_item->connect('activate', array(&$this, 'on_menu_select'));
$this->setup_submenu($menu_item, $submenu, $toplevel); // note 3
}
} else {
if ($submenu=='<hr>') {
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Explanation
- The menu definitions. Note how the multiple levels of submenus are defined.
- Call the method
setup_submenu() recursively to set up each levels of submenus.
- If there's another submenu definition, we make another recursive call to the method
setup_submenu().
Note
Note that accelerators are different from mnemonics. For example, you can choose File Open using mnemonics by pressing Alt-F followed by O. Or you can use the accelerator key Ctrl-O.
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