Thuban/Model/extension.py

# Copyright (c) 2001, 2002 by Intevation GmbH
# Authors:
# Jan-Oliver Wagner <[email protected]>
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with Thuban for details.

__version__ = "$Revision$"

from Thuban import _

from messages import EXTENSION_CHANGED, EXTENSION_OBJECTS_CHANGED

from base import TitledObject, Modifiable


class Extension(TitledObject, Modifiable):

    """Represent a extension. A extension is a package of additional
       functionality to Thuban and contains a number of Objects
           that can be freely defined in an extension.
           Each object must a a TitleObject with additional set "object.name".

    Extension objects send the following message types:

        EXTENSION_CHANGED -- Something in the extension has changed.

        EXTENSION_OBJECTS_CHANGED -- Something in the objects has changed.

    """

    forwarded_channels = (EXTENSION_CHANGED, EXTENSION_OBJECTS_CHANGED)

    def __init__(self, title):
        """Initialize the extension."""
        TitledObject.__init__(self, title)
        self.objects = []

    def Destroy(self):
        for object in self.objects:
            object.Destroy()
        Modifiable.Destroy(self)

    def AddObject(self, object):
        self.objects.append(object)
        for channel in self.forwarded_channels:
            object.Subscribe(channel, self.forward, channel)
        self.changed(EXTENSION_OBJECTS_CHANGED, self)

    def RemoveObject(self, object):
        for channel in self.forwarded_channels:
            object.Unsubscribe(channel, self.forward, channel)
        self.layers.remove(layer)
        self.changed(EXTENSION_OBJECTS_CHANGED, self)
        object.Destroy()

    def Objects(self):
        return self.objects

    def HasObjects(self):
        return len(self.objects) > 0

    def FindObject(self, title):
        """Find an object by title. If found, return it, else return None."""
        for object in self.objects:
            if object.title == title:
                return object
        return None

    def forward(self, *args):
        """Reissue events"""
        if len(args) > 1:
            args = (args[-1],) + args[:-1]
        apply(self.issue, args)

    def WasModified(self):
        """Return true if something of the extension was modified"""
        if self.modified:
            return 1
        else:
            return 0

    def UnsetModified(self):
        """Unset the modified flag of the extension"""
        Modifiable.UnsetModified(self)

    def TreeInfo(self):
        return (_("Extension: %s") % self.title,
                ["%s: %s" % (object.title, object.name)
                 for object in self.objects])
1	# Copyright (c) 2001, 2002 by Intevation GmbH
2	# Authors:
3	# Jan-Oliver Wagner <[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	__version__ = "$Revision$"
9
10	from Thuban import _
11
12	from messages import EXTENSION_CHANGED, EXTENSION_OBJECTS_CHANGED
13
14	from base import TitledObject, Modifiable
15
16
17	class Extension(TitledObject, Modifiable):
18
19	"""Represent a extension. A extension is a package of additional
20	functionality to Thuban and contains a number of Objects
21	that can be freely defined in an extension.
22	Each object must a a TitleObject with additional set "object.name".
23
24	Extension objects send the following message types:
25
26	EXTENSION_CHANGED -- Something in the extension has changed.
27
28	EXTENSION_OBJECTS_CHANGED -- Something in the objects has changed.
29
30	"""
31
32	forwarded_channels = (EXTENSION_CHANGED, EXTENSION_OBJECTS_CHANGED)
33
34	def __init__(self, title):
35	"""Initialize the extension."""
36	TitledObject.__init__(self, title)
37	self.objects = []
38
39	def Destroy(self):
40	for object in self.objects:
41	object.Destroy()
42	Modifiable.Destroy(self)
43
44	def AddObject(self, object):
45	self.objects.append(object)
46	for channel in self.forwarded_channels:
47	object.Subscribe(channel, self.forward, channel)
48	self.changed(EXTENSION_OBJECTS_CHANGED, self)
49
50	def RemoveObject(self, object):
51	for channel in self.forwarded_channels:
52	object.Unsubscribe(channel, self.forward, channel)
53	self.layers.remove(layer)
54	self.changed(EXTENSION_OBJECTS_CHANGED, self)
55	object.Destroy()
56
57	def Objects(self):
58	return self.objects
59
60	def HasObjects(self):
61	return len(self.objects) > 0
62
63	def FindObject(self, title):
64	"""Find an object by title. If found, return it, else return None."""
65	for object in self.objects:
66	if object.title == title:
67	return object
68	return None
69
70	def forward(self, *args):
71	"""Reissue events"""
72	if len(args) > 1:
73	args = (args[-1],) + args[:-1]
74	apply(self.issue, args)
75
76	def WasModified(self):
77	"""Return true if something of the extension was modified"""
78	if self.modified:
79	return 1
80	else:
81	return 0
82
83	def UnsetModified(self):
84	"""Unset the modified flag of the extension"""
85	Modifiable.UnsetModified(self)
86
87	def TreeInfo(self):
88	return (_("Extension: %s") % self.title,
89	["%s: %s" % (object.title, object.name)
90	for object in self.objects])
Name	Value
svn:eol-style	native
svn:keywords	Author Date Id Revision