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