/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/session.py
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revision 197 by jan, Thu Jun 20 15:20:58 2002 UTC revision 318 by bh, Fri Sep 13 14:21:12 2002 UTC
# Line 12  from Thuban.Lib.connector import Publish Line 12  from Thuban.Lib.connector import Publish
12    
13  from messages import MAPS_CHANGED, EXTENSIONS_CHANGED, FILENAME_CHANGED, \  from messages import MAPS_CHANGED, EXTENSIONS_CHANGED, FILENAME_CHANGED, \
14       LAYERS_CHANGED, MAP_PROJECTION_CHANGED, \       LAYERS_CHANGED, MAP_PROJECTION_CHANGED, \
15       LAYER_LEGEND_CHANGED, LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \       LAYER_LEGEND_CHANGED, LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED,\
16       EXTENSION_CHANGED, EXTENSION_OBJECTS_CHANGED       EXTENSION_CHANGED, EXTENSION_OBJECTS_CHANGED, CHANGED
17    
18  from base import TitledObject, Modifiable  from base import TitledObject, Modifiable
19    
# Line 39  class Session(TitledObject, Modifiable): Line 39  class Session(TitledObject, Modifiable):
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            CHANGED -- Generic changed event. Parameters: the session. The
44                       event is always issued when any other changed event
45                       is issused. This is useful for code that needs to be
46                       notified whenever something in the session has
47                       changed but it's too cumbersome or error-prone to
48                       subscribe to all the individual events.
49      """      """
50    
51      # message channels that have to be forwarded from maps contained in      # message channels that have to be forwarded from maps contained in
52      # the session.      # the session.
53      forwarded_channels = (      forwarded_channels = (
54            # generic channels
55            CHANGED,
56    
57          # map specific channels          # map specific channels
58          MAP_PROJECTION_CHANGED,          MAP_PROJECTION_CHANGED,
59          LAYERS_CHANGED,          LAYERS_CHANGED,
# Line 65  class Session(TitledObject, Modifiable): Line 75  class Session(TitledObject, Modifiable):
75          self.tables = []          self.tables = []
76          self.extensions = []          self.extensions = []
77    
78        def changed(self, channel = None, *args):
79            """Like the inherited version but issue a CHANGED message as well.
80    
81            The CHANGED message is only issued if channel given is a
82            different channel than CHANGED.
83            """
84            Modifiable.changed(self, channel, *args)
85            if channel != CHANGED:
86                self.issue(CHANGED, self)
87    
88      def SetFilename(self, filename):      def SetFilename(self, filename):
89          self.filename = filename          self.filename = filename
90          self.changed(FILENAME_CHANGED)          self.changed(FILENAME_CHANGED)
# Line 81  class Session(TitledObject, Modifiable): Line 101  class Session(TitledObject, Modifiable):
101              map.Subscribe(channel, self.forward, channel)              map.Subscribe(channel, self.forward, channel)
102          self.changed(MAPS_CHANGED)          self.changed(MAPS_CHANGED)
103    
104        def RemoveMap(self, map):
105            for channel in self.forwarded_channels:
106                map.Unsubscribe(channel, self.forward, channel)
107            self.maps.remove(map)
108            self.changed(MAPS_CHANGED)
109            map.Destroy()
110    
111      def Extensions(self):      def Extensions(self):
112          return self.extensions          return self.extensions
113    
# Line 98  class Session(TitledObject, Modifiable): Line 125  class Session(TitledObject, Modifiable):
125              map.Destroy()              map.Destroy()
126          self.maps = []          self.maps = []
127          self.tables = []          self.tables = []
128          Publisher.Destroy(self)          Modifiable.Destroy(self)
129    
130      def forward(self, *args):      def forward(self, *args):
131          """Reissue events"""          """Reissue events.
132    
133            If the channel the event is forwarded to is a changed-channel
134            that is not the CHANGED channel issue CHANGED as well. An
135            channel is considered to be a changed-channel if it's name ends
136            with 'CHANGED'.
137            """
138          if len(args) > 1:          if len(args) > 1:
139              args = (args[-1],) + args[:-1]              args = (args[-1],) + args[:-1]
140          apply(self.issue, args)          apply(self.issue, args)
141            channel = args[0]
142            # It's a bit of a kludge to rely on the channel name for this.
143            if channel.endswith("CHANGED") and channel != CHANGED:
144                self.issue(CHANGED, self)
145    
146      def WasModified(self):      def WasModified(self):
147          """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 122  class Session(TitledObject, Modifiable): Line 159  class Session(TitledObject, Modifiable):
159          for map in self.maps:          for map in self.maps:
160              map.UnsetModified()              map.UnsetModified()
161    
162        def TreeInfo(self):
163            items = []
164            if self.filename is None:
165                items.append("Filename:")
166            else:
167                items.append("Filename: %s" % self.filename)
168    
169            if self.WasModified():
170                items.append("Modified")
171            else:
172                items.append("Unmodified")
173    
174            items.extend(self.maps)
175            items.extend(self.extensions)
176    
177            return ("Session: %s" % self.title, items)
178    
179    
180  def create_empty_session():  def create_empty_session():
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