/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/session.py
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revision 217 by bh, Wed Jul 17 10:50:40 2002 UTC revision 241 by bh, Wed Jul 24 17:16:17 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
# Line 65  class Session(TitledObject, Modifiable): Line 72  class Session(TitledObject, Modifiable):
72          self.tables = []          self.tables = []
73          self.extensions = []          self.extensions = []
74    
75        def changed(self, channel = None, *args):
76            """Like the inherited version but issue a CHANGED message as well.
77    
78            The CHANGED message is only issued if channel given is a
79            different channel than CHANGED.
80            """
81            Modifiable.changed(self, channel, *args)
82            if channel != CHANGED:
83                self.issue(CHANGED, self)
84    
85      def SetFilename(self, filename):      def SetFilename(self, filename):
86          self.filename = filename          self.filename = filename
87          self.changed(FILENAME_CHANGED)          self.changed(FILENAME_CHANGED)
# Line 81  class Session(TitledObject, Modifiable): Line 98  class Session(TitledObject, Modifiable):
98              map.Subscribe(channel, self.forward, channel)              map.Subscribe(channel, self.forward, channel)
99          self.changed(MAPS_CHANGED)          self.changed(MAPS_CHANGED)
100    
101        def RemoveMap(self, map):
102            for channel in self.forwarded_channels:
103                map.Unsubscribe(channel, self.forward, channel)
104            self.maps.remove(map)
105            self.changed(MAPS_CHANGED)
106            map.Destroy()
107    
108      def Extensions(self):      def Extensions(self):
109          return self.extensions          return self.extensions
110    
# Line 101  class Session(TitledObject, Modifiable): Line 125  class Session(TitledObject, Modifiable):
125          Publisher.Destroy(self)          Publisher.Destroy(self)
126    
127      def forward(self, *args):      def forward(self, *args):
128          """Reissue events"""          """Reissue events.
129    
130            If the channel the event is forwarded to is a changed-channel
131            that is not the CHANGED channel issue CHANGED as well. An
132            channel is considered to be a changed-channel if it's name ends
133            with 'CHANGED'.
134            """
135          if len(args) > 1:          if len(args) > 1:
136              args = (args[-1],) + args[:-1]              args = (args[-1],) + args[:-1]
137          apply(self.issue, args)          apply(self.issue, args)
138            channel = args[0]
139            # It's a bit of a kludge to rely on the channel name for this.
140            if channel.endswith("CHANGED") and channel != CHANGED:
141                self.issue(CHANGED, self)
142    
143      def WasModified(self):      def WasModified(self):
144          """Return true if the session or one of the maps was modified"""          """Return true if the session or one of the maps was modified"""
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