/[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 197 by jan, Thu Jun 20 15:20:58 2002 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       LAYERS_CHANGED, MAP_PROJECTION_CHANGED, \
15         LAYER_LEGEND_CHANGED, LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \
16         EXTENSION_CHANGED, EXTENSION_OBJECTS_CHANGED
17    
18  from base import TitledObject, Modifiable  from base import TitledObject, Modifiable
19    
# Line 21  class Session(TitledObject, Modifiable): Line 24  class Session(TitledObject, Modifiable):
24    
25      """A complete session.      """A complete session.
26    
27      A Session consists of arbitrary numbers of maps and tables      A Session consists of arbitrary numbers of maps, tables and extensions
28    
29      Session objects send the following events:      Session objects send the following events:
30    
# Line 31  class Session(TitledObject, Modifiable): Line 34  class Session(TitledObject, Modifiable):
34    
35          MAPS_CHANGED -- Maps were added, removed.          MAPS_CHANGED -- Maps were added, removed.
36    
37            EXTENSIONS_CHANGED -- Extensions were added, removed.
38    
39          LAYERS_CHANGED -- Same as the map's event of the same name.          LAYERS_CHANGED -- Same as the map's event of the same name.
40                            It's simply resent from the session to make                            It's simply resent from the session to make
41                            subscriptions easier.                            subscriptions easier.
42      """      """
43    
44        # message channels that have to be forwarded from maps contained in
45        # the session.
46        forwarded_channels = (
47            # map specific channels
48            MAP_PROJECTION_CHANGED,
49            LAYERS_CHANGED,
50    
51            # layer channels forwarded by the map
52            LAYER_PROJECTION_CHANGED,
53            LAYER_LEGEND_CHANGED,
54            LAYER_VISIBILITY_CHANGED,
55    
56            # channels forwarded by an extension
57            EXTENSION_CHANGED,
58            EXTENSION_OBJECTS_CHANGED)
59    
60      def __init__(self, title):      def __init__(self, title):
61          TitledObject.__init__(self, title)          TitledObject.__init__(self, title)
62          Modifiable.__init__(self)          Modifiable.__init__(self)
63          self.filename = None          self.filename = None
64          self.maps = []          self.maps = []
65          self.tables = []          self.tables = []
66            self.extensions = []
67    
68      def SetFilename(self, filename):      def SetFilename(self, filename):
69          self.filename = filename          self.filename = filename
# Line 55  class Session(TitledObject, Modifiable): Line 77  class Session(TitledObject, Modifiable):
77    
78      def AddMap(self, map):      def AddMap(self, map):
79          self.maps.append(map)          self.maps.append(map)
80          for channel in (LAYERS_CHANGED, MAP_PROJECTION_CHANGED,          for channel in self.forwarded_channels:
                         LAYER_LEGEND_CHANGED):  
81              map.Subscribe(channel, self.forward, channel)              map.Subscribe(channel, self.forward, channel)
82          self.changed(MAPS_CHANGED)          self.changed(MAPS_CHANGED)
83    
84        def Extensions(self):
85            return self.extensions
86    
87        def HasExtensions(self):
88            return len(self.extensions) > 0
89    
90        def AddExtension(self, extension):
91            self.extensions.append(extension)
92            for channel in self.forwarded_channels:
93                extension.Subscribe(channel, self.forward, channel)
94            self.changed(EXTENSIONS_CHANGED)
95    
96      def Destroy(self):      def Destroy(self):
97          for map in self.maps:          for map in self.maps:
98              map.Destroy()              map.Destroy()
# Line 93  class Session(TitledObject, Modifiable): Line 126  class Session(TitledObject, Modifiable):
126    
127  def create_empty_session():  def create_empty_session():
128      """Return an empty session useful as a starting point"""      """Return an empty session useful as a starting point"""
129        import os
130      session = Session('unnamed session')      session = Session('unnamed session')
131      session.SetFilename('unnamed.session')      session.SetFilename(None)
132      session.AddMap(Map('unnamed map'))      session.AddMap(Map('unnamed map'))
133      session.UnsetModified()      session.UnsetModified()
134      return session      return session
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