/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/session.py
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revision 56 by bh, Thu Sep 13 13:54:37 2001 UTC revision 582 by jonathan, Tue Apr 1 10:22:01 2003 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001 by Intevation GmbH  # Copyright (c) 2001, 2002 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4    # Jan-Oliver Wagner <[email protected]>
5  #  #
6  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
7  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
# Line 9  __version__ = "$Revision$" Line 10  __version__ = "$Revision$"
10    
11  from Thuban.Lib.connector import Publisher  from Thuban.Lib.connector import Publisher
12    
13  from messages import MAPS_CHANGED, LAYERS_CHANGED, MAP_PROJECTION_CHANGED, \  from messages import MAPS_CHANGED, EXTENSIONS_CHANGED, FILENAME_CHANGED, \
14       LAYER_LEGEND_CHANGED, FILENAME_CHANGED       MAP_LAYERS_CHANGED, MAP_PROJECTION_CHANGED, \
15         LAYER_CHANGED, LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED,\
16         EXTENSION_CHANGED, EXTENSION_OBJECTS_CHANGED, CHANGED
17    
18    from Thuban import _
19    
20  from base import TitledObject, Modifiable  from base import TitledObject, Modifiable
21    
# Line 21  class Session(TitledObject, Modifiable): Line 26  class Session(TitledObject, Modifiable):
26    
27      """A complete session.      """A complete session.
28    
29      A Session consists of arbitrary numbers of maps and tables      A Session consists of arbitrary numbers of maps, tables and extensions
30    
31      Session objects send the following events:      Session objects send the following events:
32    
# Line 31  class Session(TitledObject, Modifiable): Line 36  class Session(TitledObject, Modifiable):
36    
37          MAPS_CHANGED -- Maps were added, removed.          MAPS_CHANGED -- Maps were added, removed.
38    
39          LAYERS_CHANGED -- Same as the map's event of the same name.          EXTENSIONS_CHANGED -- Extensions were added, removed.
40    
41            MAP_LAYERS_CHANGED -- Same as the map's event of the same name.
42                            It's simply resent from the session to make                            It's simply resent from the session to make
43                            subscriptions easier.                            subscriptions easier.
44    
45            CHANGED -- Generic changed event. Parameters: the session. The
46                       event is always issued when any other changed event
47                       is issused. This is useful for code that needs to be
48                       notified whenever something in the session has
49                       changed but it's too cumbersome or error-prone to
50                       subscribe to all the individual events.
51      """      """
52    
53        # message channels that have to be forwarded from maps contained in
54        # the session.
55        forwarded_channels = (
56            # generic channels
57            CHANGED,
58    
59            # map specific channels
60            MAP_PROJECTION_CHANGED,
61            MAP_LAYERS_CHANGED,
62    
63            # layer channels forwarded by the map
64            LAYER_PROJECTION_CHANGED,
65            LAYER_CHANGED,
66            LAYER_VISIBILITY_CHANGED,
67    
68            # channels forwarded by an extension
69            EXTENSION_CHANGED,
70            EXTENSION_OBJECTS_CHANGED)
71    
72      def __init__(self, title):      def __init__(self, title):
73          TitledObject.__init__(self, title)          TitledObject.__init__(self, title)
74          Modifiable.__init__(self)          Modifiable.__init__(self)
75          self.filename = None          self.filename = None
76          self.maps = []          self.maps = []
77          self.tables = []          self.tables = []
78            self.extensions = []
79    
80        def changed(self, channel = None, *args):
81            """Like the inherited version but issue a CHANGED message as well.
82    
83            The CHANGED message is only issued if channel given is a
84            different channel than CHANGED.
85            """
86            Modifiable.changed(self, channel, *args)
87            if channel != CHANGED:
88                self.issue(CHANGED, self)
89    
90      def SetFilename(self, filename):      def SetFilename(self, filename):
91          self.filename = filename          self.filename = filename
# Line 55  class Session(TitledObject, Modifiable): Line 99  class Session(TitledObject, Modifiable):
99    
100      def AddMap(self, map):      def AddMap(self, map):
101          self.maps.append(map)          self.maps.append(map)
102          for channel in (LAYERS_CHANGED, MAP_PROJECTION_CHANGED,          for channel in self.forwarded_channels:
                         LAYER_LEGEND_CHANGED):  
103              map.Subscribe(channel, self.forward, channel)              map.Subscribe(channel, self.forward, channel)
104          self.changed(MAPS_CHANGED)          self.changed(MAPS_CHANGED)
105    
106        def RemoveMap(self, map):
107            for channel in self.forwarded_channels:
108                map.Unsubscribe(channel, self.forward, channel)
109            self.maps.remove(map)
110            self.changed(MAPS_CHANGED)
111            map.Destroy()
112    
113        def Extensions(self):
114            return self.extensions
115    
116        def HasExtensions(self):
117            return len(self.extensions) > 0
118    
119        def AddExtension(self, extension):
120            self.extensions.append(extension)
121            for channel in self.forwarded_channels:
122                extension.Subscribe(channel, self.forward, channel)
123            self.changed(EXTENSIONS_CHANGED)
124    
125      def Destroy(self):      def Destroy(self):
126          for map in self.maps:          for map in self.maps:
127              map.Destroy()              map.Destroy()
128          self.maps = []          self.maps = []
129          self.tables = []          self.tables = []
130          Publisher.Destroy(self)          Modifiable.Destroy(self)
131    
132      def forward(self, *args):      def forward(self, *args):
133          """Reissue events"""          """Reissue events.
134    
135            If the channel the event is forwarded to is a changed-channel
136            that is not the CHANGED channel issue CHANGED as well. An
137            channel is considered to be a changed-channel if it's name ends
138            with 'CHANGED'.
139            """
140          if len(args) > 1:          if len(args) > 1:
141              args = (args[-1],) + args[:-1]              args = (args[-1],) + args[:-1]
142          apply(self.issue, args)          apply(self.issue, args)
143            channel = args[0]
144            # It's a bit of a kludge to rely on the channel name for this.
145            if channel.endswith("CHANGED") and channel != CHANGED:
146                self.issue(CHANGED, self)
147    
148      def WasModified(self):      def WasModified(self):
149          """Return true if the session or one of the maps was modified"""          """Return true if the session or one of the maps was modified"""
# Line 89  class Session(TitledObject, Modifiable): Line 161  class Session(TitledObject, Modifiable):
161          for map in self.maps:          for map in self.maps:
162              map.UnsetModified()              map.UnsetModified()
163    
164        def TreeInfo(self):
165            items = []
166            if self.filename is None:
167                items.append(_("Filename:"))
168            else:
169                items.append(_("Filename: %s") % self.filename)
170    
171            if self.WasModified():
172                items.append(_("Modified"))
173            else:
174                items.append(_("Unmodified"))
175    
176            items.extend(self.maps)
177            items.extend(self.extensions)
178    
179            return (_("Session: %s") % self.title, items)
180    
181    
182  def create_empty_session():  def create_empty_session():
183      """Return an empty session useful as a starting point"""      """Return an empty session useful as a starting point"""
184      session = Session('unnamed session')      import os
185      session.SetFilename('unnamed.session')      session = Session(_('unnamed session'))
186      session.AddMap(Map('unnamed map'))      session.SetFilename(None)
187        session.AddMap(Map(_('unnamed map')))
188      session.UnsetModified()      session.UnsetModified()
189      return session      return session
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