Thuban/UI/menu.py

# Copyright (C) 2001, 2002 by Intevation GmbH
# Author:
# Bernhard Herzog <[email protected]>
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with Thuban for details.

"""Menu management"""

__version__ = "$Revision$"


class Menu:

    """Represent a menu or submenu.

    A menu has a name and a title. The name can be used to identify
    menus internally while the title is intended for use in the GUI.

    Menu items can be added with the Insert* methods.
    """

    def __init__(self, name, title, items = None):
        """Initialize the menu.

        Parameters:
           name -- the name of the menu
           title -- the (possibly localized) title of the menu
           items -- (optional) a list of menu items.

        The items list may contains strings with command names, None to
        indicate separators or Menu instances for submenus.
        """
        self.name = name
        self.title = title
        if items is None:
            self.items = []
        else:
            self.items = items

    def item_index(self, item):
        """Return the index of item in the menu.

        Return None it item is not found.
        """
        try:
            return self.items.index(item)
        except ValueError:
            return None

    def find_menu(self, name):
        """Return the submenu named name or None if no such item exists"""
        for item in self.items:
            if isinstance(item, Menu) and item.name == name:
                return item
        return None

    def InsertItem(self, item, menu = (), after = None):
        """Insert a menu item.

        Parameters:
        
         item -- the menu item to insert must be either a string with
                the command's name or a Menu instance.
         
         menu -- (optional) the submenu to insert into. It should be a
                sequence of menu names.
         
         after -- (optional) insert the new item after this one. after
                 should be the name of a command.
        """
        # if menu is given, get the first submenu
        if menu:
            submenu_index = self.find_menu(menu[0])
            if submenu_index is not None:
                submenu_index.InsertItem(item, menu = menu[1:], after = after)
            else:
                # the submenu doesn't exist yet. Raise an error.
                raise KeyError("Submenu %s doesn't exist" % menu[0])
        else:
            if after is not None:
                idx = self.item_index(after)
            else:
                idx = None

            if idx is not None:
                self.items.insert(idx + 1, item) 
            else:
                self.items.append(item)

    def InsertSeparator(self):
        """Insert a separator"""
        self.InsertItem(None)

    def InsertMenu(self, name, title, menu = (), after = None):
        """Insert and return a new menu.

        Parameters:

         name -- the (internal) name of the menu

         title -- the (possibly localized) title
         
         menu -- (optional) the submenu to insert into. It should be a
                sequence of menu names.
         
         after -- (optional) insert the new item after this one. after
                 should be the name of a command.
        """
        newmenu = Menu(name, title)
        self.InsertItem(newmenu, menu = menu, after = after)
        return newmenu
1	bh	187	# Copyright (C) 2001, 2002 by Intevation GmbH
2			# Author:
3			# Bernhard Herzog <[email protected]>
4			#
5			# This program is free software under the GPL (>=v2)
6			# Read the file COPYING coming with Thuban for details.
7
8			"""Menu management"""
9
10			__version__ = "$Revision$"
11
12
13			class Menu:
14
15			"""Represent a menu or submenu.
16
17			A menu has a name and a title. The name can be used to identify
18			menus internally while the title is intended for use in the GUI.
19
20			Menu items can be added with the Insert* methods.
21			"""
22
23			def __init__(self, name, title, items = None):
24			"""Initialize the menu.
25
26			Parameters:
27			name -- the name of the menu
28			title -- the (possibly localized) title of the menu
29			items -- (optional) a list of menu items.
30
31			The items list may contains strings with command names, None to
32			indicate separators or Menu instances for submenus.
33			"""
34			self.name = name
35			self.title = title
36			if items is None:
37			self.items = []
38			else:
39			self.items = items
40
41			def item_index(self, item):
42			"""Return the index of item in the menu.
43
44			Return None it item is not found.
45			"""
46			try:
47			return self.items.index(item)
48			except ValueError:
49			return None
50
51			def find_menu(self, name):
52			"""Return the submenu named name or None if no such item exists"""
53			for item in self.items:
54			if isinstance(item, Menu) and item.name == name:
55			return item
56			return None
57
58			def InsertItem(self, item, menu = (), after = None):
59			"""Insert a menu item.
60
61			Parameters:
62
63			item -- the menu item to insert must be either a string with
64			the command's name or a Menu instance.
65
66			menu -- (optional) the submenu to insert into. It should be a
67			sequence of menu names.
68
69			after -- (optional) insert the new item after this one. after
70			should be the name of a command.
71			"""
72			# if menu is given, get the first submenu
73			if menu:
74			submenu_index = self.find_menu(menu[0])
75			if submenu_index is not None:
76			submenu_index.InsertItem(item, menu = menu[1:], after = after)
77			else:
78			# the submenu doesn't exist yet. Raise an error.
79			raise KeyError("Submenu %s doesn't exist" % menu[0])
80			else:
81			if after is not None:
82			idx = self.item_index(after)
83			else:
84			idx = None
85
86			if idx is not None:
87			self.items.insert(idx + 1, item)
88			else:
89			self.items.append(item)
90
91			def InsertSeparator(self):
92			"""Insert a separator"""
93			self.InsertItem(None)
94
95			def InsertMenu(self, name, title, menu = (), after = None):
96			"""Insert and return a new menu.
97
98			Parameters:
99
100			name -- the (internal) name of the menu
101
102			title -- the (possibly localized) title
103
104			menu -- (optional) the submenu to insert into. It should be a
105			sequence of menu names.
106
107			after -- (optional) insert the new item after this one. after
108			should be the name of a command.
109			"""
110			newmenu = Menu(name, title)
111			self.InsertItem(newmenu, menu = menu, after = after)
112			return newmenu
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