/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/classification.py
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revision 484 by jonathan, Fri Mar 7 18:20:10 2003 UTC revision 528 by jonathan, Wed Mar 12 19:55:13 2003 UTC
# Line 59  class Classification: Line 59  class Classification:
59          self.field = None          self.field = None
60          self.fieldType = None          self.fieldType = None
61          self.groups = []          self.groups = []
         self.__sendMessages = False  
62    
63          self.__ToggleMessages(False)          self.__setLayerLock = False
64    
65          self.SetDefaultGroup(ClassGroupDefault())          self.SetDefaultGroup(ClassGroupDefault())
66    
67          self.SetLayer(layer)          self.SetLayer(layer)
68          self.SetField(field)          self.SetField(field)
69    
         self.__ToggleMessages(True)  
   
70      def __iter__(self):      def __iter__(self):
71          return ClassIterator(self.groups)          return ClassIterator(self.groups)
72    
73      def __ToggleMessages(self, on):      def __SendNotification(self):
74          self.__sendMessages = on          """Notify the layer that this class has changed."""
75            if self.layer is not None:
76      def __SendMessage(self, message):              self.layer.ClassChanged()
         """Send the message 'message' to the parent layer."""  
         if self.__sendMessages and self.layer is not None:  
             self.layer.changed(message, self.layer)  
77            
78      def SetField(self, field = None):      def SetField(self, field):
79          """Set the name of the data table field to use.          """Set the name of the data table field to use.
80                    
81             If there is no layer then the field type is set to None,             If there is no layer then the field type is set to None,
# Line 92  class Classification: Line 88  class Classification:
88          if field == "":          if field == "":
89              field = None              field = None
90    
         self.field = field  
91    
92          if self.layer is not None:          if field is None:
93              fieldType = self.layer.GetFieldType(field)              if self.layer is not None:
94                    self.fieldType = None
95          else:          else:
96              fieldType = None              if self.layer is not None:
97                    fieldType = self.layer.GetFieldType(field)
98          self.SetFieldType(fieldType)                  if fieldType is None:
99                        raise ValueError("'%s' was not found in the layer's table."
100                                         % self.field)
101    
102                    #
103                    # unfortunately we cannot call SetFieldType() because it
104                    # requires the layer to be None
105                    #
106                    self.fieldType = fieldType
107                    #self.SetFieldType(fieldType)
108    
109          # XXX: if fieldType comes back None then field isn't in the table!          self.field = field
110    
111          self.__SendMessage(LAYER_LEGEND_CHANGED)          self.__SendNotification()
112    
113      def GetField(self):      def GetField(self):
114          """Return the name of the field."""          """Return the name of the field."""
# Line 114  class Classification: Line 119  class Classification:
119          return self.fieldType          return self.fieldType
120    
121      def SetFieldType(self, type):      def SetFieldType(self, type):
122          self.fieldType = type          """Set the type of the field used by this classification.
123    
124      def SetLayer(self, layer):          A ValueError is raised if the owning layer is not None and
125          """Set the owning Layer of this classification."""          'type' is different from the current field type.
126            """
127    
128          if __debug__:          if type != self.fieldType:
129              if layer is not None:              if self.layer is not None:
130                  assert(isinstance(layer, Thuban.Model.layer.Layer))                  raise ValueError()
131                else:
132                    self.fieldType = type
133                    self.__SendNotification()
134    
135        def SetLayer(self, layer):
136            """Set the owning Layer of this classification.
137    
138               A ValueError exception will be thrown either the field or
139               field type mismatch the information in the layer's table.
140            """
141    
142          # prevent infinite recursion when calling SetClassification()          # prevent infinite recursion when calling SetClassification()
143          if self.layer is not None and layer == self.layer:          if self.__setLayerLock: return
             return  
144    
145          self.layer = layer          self.__setLayerLock = True
         self.SetField(self.GetField()) # XXX: this sync's the fieldType  
146    
147          if self.layer is not None:          if layer is None:
148              self.layer.SetClassification(self)              if self.layer is not None:
149                    l = self.layer
150                    self.layer = None
151                    l.SetClassification(None)
152            else:
153                assert(isinstance(layer, Thuban.Model.layer.Layer))
154    
155                old_layer = self.layer
156    
157                self.layer = layer
158    
159                try:
160                    self.SetField(self.GetField()) # this sync's the fieldType
161                except ValueError:
162                    self.layer = old_layer
163                    self.__setLayerLock = False
164                    raise ValueError
165                else:
166                    self.layer.SetClassification(self)
167    
168          #self.__SendMessage(LAYER_LEGEND_CHANGED)          self.__setLayerLock = False
169    
170      def GetLayer(self):      def GetLayer(self):
171          """Return the parent layer."""          """Return the parent layer."""
# Line 165  class Classification: Line 197  class Classification:
197          """          """
198          assert(isinstance(fill, Color))          assert(isinstance(fill, Color))
199          self.GetDefaultGroup().GetProperties().SetFill(fill)          self.GetDefaultGroup().GetProperties().SetFill(fill)
200          self.__SendMessage(LAYER_LEGEND_CHANGED)          self.__SendNotification()
201                    
202      def GetDefaultFill(self):      def GetDefaultFill(self):
203          """Return the default fill color."""          """Return the default fill color."""
# Line 178  class Classification: Line 210  class Classification:
210          """          """
211          assert(isinstance(color, Color))          assert(isinstance(color, Color))
212          self.GetDefaultGroup().GetProperties().SetLineColor(color)          self.GetDefaultGroup().GetProperties().SetLineColor(color)
213          self.__SendMessage(LAYER_LEGEND_CHANGED)          self.__SendNotification()
214                    
215      def GetDefaultLineColor(self):      def GetDefaultLineColor(self):
216          """Return the default line color."""          """Return the default line color."""
# Line 191  class Classification: Line 223  class Classification:
223          """          """
224          assert(isinstance(lineWidth, IntType))          assert(isinstance(lineWidth, IntType))
225          self.GetDefaultGroup().GetProperties().SetLineWidth(lineWidth)          self.GetDefaultGroup().GetProperties().SetLineWidth(lineWidth)
226          self.__SendMessage(LAYER_LEGEND_CHANGED)          self.__SendNotification()
227                    
228      def GetDefaultLineWidth(self):      def GetDefaultLineWidth(self):
229          """Return the default line width."""          """Return the default line width."""
# Line 207  class Classification: Line 239  class Classification:
239    
240          if len(self.groups) > 0 and isinstance(item, ClassGroupDefault):          if len(self.groups) > 0 and isinstance(item, ClassGroupDefault):
241              self.groups[0] = item              self.groups[0] = item
             #self.SetDefaultGroup(item)  
242          else:          else:
243              self.groups.append(item)              self.groups.append(item)
244    
245          self.__SendMessage(LAYER_LEGEND_CHANGED)          self.__SendNotification()
246    
247      def GetGroup(self, value):      def GetGroup(self, value):
248          """Return the associated group, or the default group.          """Return the associated group, or the default group.
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