/[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 723 by bh, Thu Apr 24 15:31:53 2003 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002 by Intevation GmbH  # Copyright (c) 2001, 2002, 2003 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4  # Jan-Oliver Wagner <[email protected]>  # Jan-Oliver Wagner <[email protected]>
# Line 8  Line 8 
8    
9  __version__ = "$Revision$"  __version__ = "$Revision$"
10    
 from Thuban.Lib.connector import Publisher  
   
11  from messages import MAPS_CHANGED, EXTENSIONS_CHANGED, FILENAME_CHANGED, \  from messages import MAPS_CHANGED, EXTENSIONS_CHANGED, FILENAME_CHANGED, \
12       LAYERS_CHANGED, MAP_PROJECTION_CHANGED, \       MAP_LAYERS_CHANGED, MAP_PROJECTION_CHANGED, \
13       LAYER_LEGEND_CHANGED, LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \       LAYER_CHANGED, LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED,\
14       EXTENSION_CHANGED, EXTENSION_OBJECTS_CHANGED       EXTENSION_CHANGED, EXTENSION_OBJECTS_CHANGED, CHANGED
15    
16  from base import TitledObject, Modifiable  from Thuban import _
17    
18    from base import TitledObject, Modifiable
19  from map import Map  from map import Map
20    from data import ShapefileStore
21    
22    
23  class Session(TitledObject, Modifiable):  class Session(TitledObject, Modifiable):
# Line 36  class Session(TitledObject, Modifiable): Line 36  class Session(TitledObject, Modifiable):
36    
37          EXTENSIONS_CHANGED -- Extensions were added, removed.          EXTENSIONS_CHANGED -- Extensions were added, removed.
38    
39          LAYERS_CHANGED -- Same as the map's event of the same name.          MAP_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,          MAP_LAYERS_CHANGED,
60    
61          # layer channels forwarded by the map          # layer channels forwarded by the map
62          LAYER_PROJECTION_CHANGED,          LAYER_PROJECTION_CHANGED,
63          LAYER_LEGEND_CHANGED,          LAYER_CHANGED,
64          LAYER_VISIBILITY_CHANGED,          LAYER_VISIBILITY_CHANGED,
65    
66          # channels forwarded by an extension          # channels forwarded by an extension
# 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 93  class Session(TitledObject, Modifiable): Line 120  class Session(TitledObject, Modifiable):
120              extension.Subscribe(channel, self.forward, channel)              extension.Subscribe(channel, self.forward, channel)
121          self.changed(EXTENSIONS_CHANGED)          self.changed(EXTENSIONS_CHANGED)
122    
123        def OpenShapefile(self, filename):
124            """Return a shapefile store object for the data in the given file"""
125            return ShapefileStore(self, filename)
126    
127      def Destroy(self):      def Destroy(self):
128          for map in self.maps:          for map in self.maps:
129              map.Destroy()              map.Destroy()
130          self.maps = []          self.maps = []
131          self.tables = []          self.tables = []
132          Publisher.Destroy(self)          Modifiable.Destroy(self)
133    
134      def forward(self, *args):      def forward(self, *args):
135          """Reissue events"""          """Reissue events.
136    
137            If the channel the event is forwarded to is a changed-channel
138            that is not the CHANGED channel issue CHANGED as well. An
139            channel is considered to be a changed-channel if it's name ends
140            with 'CHANGED'.
141            """
142          if len(args) > 1:          if len(args) > 1:
143              args = (args[-1],) + args[:-1]              args = (args[-1],) + args[:-1]
144          apply(self.issue, args)          apply(self.issue, args)
145            channel = args[0]
146            # It's a bit of a kludge to rely on the channel name for this.
147            if channel.endswith("CHANGED") and channel != CHANGED:
148                self.issue(CHANGED, self)
149    
150      def WasModified(self):      def WasModified(self):
151          """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 125  class Session(TitledObject, Modifiable): Line 166  class Session(TitledObject, Modifiable):
166      def TreeInfo(self):      def TreeInfo(self):
167          items = []          items = []
168          if self.filename is None:          if self.filename is None:
169              items.append("Filename:")              items.append(_("Filename:"))
170          else:          else:
171              items.append("Filename: %s" % self.filename)              items.append(_("Filename: %s") % self.filename)
172    
173          if self.WasModified():          if self.WasModified():
174              items.append("Modified")              items.append(_("Modified"))
175          else:          else:
176              items.append("Unmodified")              items.append(_("Unmodified"))
177    
178          items.extend(self.maps)          items.extend(self.maps)
179          items.extend(self.extensions)          items.extend(self.extensions)
180    
181          return ("Session: %s" % self.title, items)          return (_("Session: %s") % self.title, items)
182    
183    
184  def create_empty_session():  def create_empty_session():
185      """Return an empty session useful as a starting point"""      """Return an empty session useful as a starting point"""
186      import os      import os
187      session = Session('unnamed session')      session = Session(_('unnamed session'))
188      session.SetFilename(None)      session.SetFilename(None)
189      session.AddMap(Map('unnamed map'))      session.AddMap(Map(_('unnamed map')))
190      session.UnsetModified()      session.UnsetModified()
191      return session      return session
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