#
#		Python GUI - Menu Lists - Generic
#

class MenuList(list):
    """A MenuList is a sequence of Menus with methods for finding
    menus and menu items by command."""
    
    def menu_with_command(self, cmd):
        """Returns the menu containing the given command, or None
        if there is no such menu in the list."""
        for menu in self:
            if menu.item_with_command(cmd):
                return menu
        return None
    
    def item_with_command(self, cmd):
        """Returns the menu item having the given command, or None
        if there is no such item."""
        for menu in self:
            item = menu.item_with_command(cmd)
            if item:
                return item
        return None