/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/classification.py
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revision 479 by jonathan, Thu Mar 6 16:46:07 2003 UTC revision 528 by jonathan, Wed Mar 12 19:55:13 2003 UTC
# Line 23  on the mapping algorithm. Line 23  on the mapping algorithm.
23  # fix for people using python2.1  # fix for people using python2.1
24  from __future__ import nested_scopes  from __future__ import nested_scopes
25    
26    import copy
27    
28  from types import *  from types import *
29    
30  from messages import LAYER_PROJECTION_CHANGED, LAYER_LEGEND_CHANGED, \  from messages import LAYER_PROJECTION_CHANGED, LAYER_LEGEND_CHANGED, \
# Line 57  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 90  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 112  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 type != self.fieldType:
129                if self.layer is not None:
130                    raise ValueError()
131                else:
132                    self.fieldType = type
133                    self.__SendNotification()
134    
135          if __debug__:      def SetLayer(self, layer):
136              if layer is not None:          """Set the owning Layer of this classification.
137                  assert(isinstance(layer, Thuban.Model.layer.Layer))  
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          #self.__SendMessage(LAYER_LEGEND_CHANGED)              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.__setLayerLock = False
169    
170      def GetLayer(self):      def GetLayer(self):
171          """Return the parent layer."""          """Return the parent layer."""
# Line 163  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 176  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 189  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 205  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.
# Line 350  class ClassGroupProperties: Line 383  class ClassGroupProperties:
383          if props is not None:          if props is not None:
384              self.SetProperties(props)              self.SetProperties(props)
385          else:          else:
386              self.SetLineColor(Color.None)              self.SetLineColor(Color.Black)
387              self.SetLineWidth(1)              self.SetLineWidth(1)
388              self.SetFill(Color.None)              self.SetFill(Color.None)
389    
# Line 414  class ClassGroupProperties: Line 447  class ClassGroupProperties:
447      def __ne__(self, other):      def __ne__(self, other):
448          return not self.__eq__(other)          return not self.__eq__(other)
449    
450        def __copy__(self):
451            return ClassGroupProperties(self)
452    
453  class ClassGroup:  class ClassGroup:
454      """A base class for all Groups within a Classification"""      """A base class for all Groups within a Classification"""
455    
# Line 481  class ClassGroupSingleton(ClassGroup): Line 517  class ClassGroupSingleton(ClassGroup):
517                                     self.GetProperties(),                                     self.GetProperties(),
518                                     self.GetLabel())                                     self.GetLabel())
519    
520        def __deepcopy__(self, memo):
521            return ClassGroupSingleton(copy.copy(self.GetValue()),
522                                       copy.copy(self.GetProperties()),
523                                       copy.copy(self.GetLabel()))
524    
525      def GetValue(self):      def GetValue(self):
526          """Return the associated value."""          """Return the associated value."""
527          return self.value          return self.value
# Line 540  class ClassGroupDefault(ClassGroup): Line 581  class ClassGroupDefault(ClassGroup):
581      def __copy__(self):      def __copy__(self):
582          return ClassGroupDefault(self.GetProperties(), self.GetLabel())          return ClassGroupDefault(self.GetProperties(), self.GetLabel())
583    
584        def __deepcopy__(self, memo):
585            return ClassGroupDefault(copy.copy(self.GetProperties()),
586                                     copy.copy(self.GetLabel()))
587    
588      def Matches(self, value):      def Matches(self, value):
589          return True          return True
590    
# Line 598  class ClassGroupRange(ClassGroup): Line 643  class ClassGroupRange(ClassGroup):
643                                 self.GetProperties(),                                 self.GetProperties(),
644                                 self.GetLabel())                                 self.GetLabel())
645    
646        def __deepcopy__(self, memo):
647            return ClassGroupRange(copy.copy(self.GetMin()),
648                                   copy.copy(self.GetMax()),
649                                   copy.copy(self.GetProperties()),
650                                   copy.copy(self.GetLabel()))
651    
652      def GetMin(self):      def GetMin(self):
653          """Return the range's minimum value."""          """Return the range's minimum value."""
654          return self.min          return self.min
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