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Problem When you have set up menus using GtkUIManager, you can activate or deactivate a group of menu items with just a one liner.
In this example, the Edit menu is only activated when there is a document. When the application is first started, there is no document, so the Edit menu is grayed out. When the user opens a document or starts a new document, we activate the Edit menu. When the user closes a document, we grayed out the Edit menu again as shown below:
Solution
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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());
// define menu definition
$menu_definition = '
<ui>
<menubar name="menubar1">
<menu action="FileMenu">
<menuitem action="New"/>
<menuitem action="Open"/>
<menuitem action="Close"/>
<separator/>
<menuitem action="Exit"/>
</menu>
<menu action="EditMenu">
<menuitem action="Cut"/>
<menuitem action="Copy"/>
<menuitem action="Paste"/>
<separator/>
<menuitem action="SelectAll"/>
</menu>
</menubar>
</ui>';
setup_menu($vbox, $menu_definition);
// display title
$title = new GtkLabel("Set up menu using GtkUIManager\n".
"Part 2 - the power of ActionGroup");
$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);
$window->show_all();
Gtk::main();
// setup menu
function setup_menu($vbox, $menu_definition) {
global $ui_mgr;
$ui_mgr = new GtkUiManager();
$file_action_group = new GtkActionGroup("FileActions");
$ui_mgr->insert_action_group($file_action_group, 0);
$fileAction = new GtkAction('FileMenu','_File', '', '');
$newAction = new GtkAction('New','_New', '', Gtk::STOCK_NEW);
$newAction->connect('activate','on_menu_select');
$openAction = new GtkAction('Open','_Open','', Gtk::STOCK_OPEN);
$openAction->connect('activate','on_menu_select');
$closeAction = new GtkAction('Close','_Close','', Gtk::STOCK_CLOSE);
$closeAction->connect('activate','on_menu_select');
$exitAction = new GtkAction('Exit','E_xit','', Gtk::STOCK_QUIT);
$exitAction->connect('activate', 'on_menu_select');
$file_action_group->add_action($fileAction);
$file_action_group->add_action($newAction);
$file_action_group->add_action($openAction);
$file_action_group->add_action($closeAction);
$file_action_group->add_action($exitAction);
$editAction = new GtkAction('EditMenu','_Edit','', '');
$cutAction = new GtkAction('Cut','Cu_t','', Gtk::STOCK_CUT);
$cutAction->connect('activate','on_menu_select');
$copyAction = new GtkAction('Copy','_Copy','', Gtk::STOCK_COPY);
$copyAction->connect('activate','on_menu_select');
$pasteAction = new GtkAction('Paste','_Paste','', Gtk::STOCK_PASTE);
$pasteAction->connect('activate','on_menu_select');
$selectAllAction = new GtkAction('SelectAll','Select _All','', '');
$selectAllAction->connect('activate', 'on_menu_select');
$edit_action_group = new GtkActionGroup("EditActions");
$ui_mgr->insert_action_group($edit_action_group, 0);
$edit_action_group->add_action($editAction);
$edit_action_group->add_action($cutAction);
$edit_action_group->add_action($copyAction);
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Explanation The above example makes use of the code in Part 1.
What's new here:
- When the application is first started, there is no active document, so we grayed out the Edit menu.
- Get the action group.
- When the user opens an existing document or starts a new document, we active the Edit menu.
- When the user closes the document, we deactive the Edit menu.
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