/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/tree.py
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revision 177 by bh, Wed May 15 14:02:09 2002 UTC revision 353 by bh, Tue Dec 3 17:35:30 2002 UTC
# Line 9  Line 9 
9    
10  __version__ = "$Revision$"  __version__ = "$Revision$"
11    
12    from types import StringType
13    
14  from wxPython.wx import *  from wxPython.wx import *
15    
16  from Thuban.Model.messages import MAPS_CHANGED, MAP_PROJECTION_CHANGED, \  from Thuban.Model.messages import CHANGED
17       LAYERS_CHANGED, LAYER_LEGEND_CHANGED, LAYER_VISIBILITY_CHANGED  from Thuban.Model.layer import Layer
 from Thuban.Model.layer import Layer, shapetype_names  
18  from Thuban.Model.map import Map  from Thuban.Model.map import Map
19    
20  from dialogs import NonModalDialog  from dialogs import NonModalDialog
21  from messages import SESSION_CHANGED, SELECTED_LAYER  from messages import SESSION_CHANGED, SELECTED_LAYER
22    
 def color_string(color):  
     if color is None:  
         return "None"  
     return "(%.3f, %.3f, %.3f)" % (color.red, color.green, color.blue)  
   
23    
24  class SessionTreeCtrl(wxTreeCtrl):  class SessionTreeCtrl(wxTreeCtrl):
25    
26      # the session channels to subscribe to to update the tree      """Widget to display a tree view of the session.
27      session_channels = (MAPS_CHANGED, MAP_PROJECTION_CHANGED,  
28                          LAYERS_CHANGED, LAYER_LEGEND_CHANGED,      The tree view is created recursively from the session object. The
29                          LAYER_VISIBILITY_CHANGED)      tree view calls the session's TreeInfo method which should return a
30        pair (<title>, <item>) where <title> ist the title of the session
31        item in the tree view and <items> is a list of objects to use as the
32        children of the session in the tree view.
33    
34        The items list can contain three types of items:
35    
36           1. a string. The string is used as the title for a leaf item in
37              the tree view.
38    
39           2. an object with a TreeInfo method. This method is called and
40              should return a pair just like the session's TreeInfo method.
41    
42           3. a pair (<title>, <item>) which is treated like the return
43              value of TreeInfo.
44        """
45    
46      def __init__(self, parent, ID, app):      def __init__(self, parent, ID, app):
47          # Use the WANTS_CHARS style so the panel doesn't eat the Return key.          # Use the WANTS_CHARS style so the panel doesn't eat the Return key.
# Line 57  class SessionTreeCtrl(wxTreeCtrl): Line 68  class SessionTreeCtrl(wxTreeCtrl):
68    
69      def unsubscribe_all(self):      def unsubscribe_all(self):
70          if self.session is not None:          if self.session is not None:
71              for channel in self.session_channels:              self.session.Unsubscribe(CHANGED, self.update_tree)
                 self.session.Unsubscribe(channel, self.update_tree)  
72              self.session = None              self.session = None
73          self.app.Unsubscribe(SESSION_CHANGED, self.session_changed)          self.app.Unsubscribe(SESSION_CHANGED, self.session_changed)
74          self.app.interactor.Unsubscribe(SELECTED_LAYER, self.layer_selected)          self.app.interactor.Unsubscribe(SELECTED_LAYER, self.layer_selected)
# Line 66  class SessionTreeCtrl(wxTreeCtrl): Line 76  class SessionTreeCtrl(wxTreeCtrl):
76      def update_tree(self, *args):      def update_tree(self, *args):
77          """Clear and rebuild the tree"""          """Clear and rebuild the tree"""
78          self.DeleteAllItems()          self.DeleteAllItems()
         session = self.app.session  
         root = self.AddRoot("Session: %s" % session.title)  
79          self.layer_to_item.clear()          self.layer_to_item.clear()
         if session.filename == None:  
             self.AppendItem(root, "Filename:")  
         else:  
             self.AppendItem(root, "Filename: %s" % session.filename)  
         if session.WasModified():  
             self.AppendItem(root, "Modified: yes")  
         else:  
             self.AppendItem(root, "Modified: no")  
80    
81          for map in session.Maps():          session = self.app.session
82              mapitem = self.AppendItem(root, "Map: %s" % map.title)          info = session.TreeInfo()
83              self.SetPyData(mapitem, map)          root = self.AddRoot(info[0])
84              if map.BoundingBox() != None:          self.add_items(root, info[1])
                 self.AppendItem(mapitem, ("Extent (lat-lon): (%g, %g, %g, %g)"  
                                           % map.BoundingBox()))  
             if map.projection and len(map.projection.params) > 0:  
                 self.AppendItem(mapitem,  
                                 ("Extent (projected): (%g, %g, %g, %g)"  
                                  % map.ProjectedBoundingBox()))  
                 projectionitem = self.AppendItem(mapitem, "Projection")  
                 for param in map.projection.params:  
                     parameteritem = self.AppendItem(projectionitem, str(param))  
                 self.Expand(projectionitem)  
   
             layers = map.Layers()  
             for layer_index in range(len(layers) - 1, -1, -1):  
                 layer = layers[layer_index]  
                 idata = wxTreeItemData()  
                 idata.SetData(layer)  
                 layeritem = self.AppendItem(mapitem,  
                                             "Layer '%s'" % layer.Title(),  
                                             data = idata)  
                 self.layer_to_item[id(layer)] = layeritem  
                 if layer is self.app.interactor.selected_layer:  
                     self.SelectItem(layeritem)  
                 if isinstance(layer, Layer):  
                     if layer.Visible():  
                         text = "Shown"  
                     else:  
                         text = "Hidden"  
                     self.AppendItem(layeritem, text)  
                     self.AppendItem(layeritem, "Shapes: %d" %layer.NumShapes())  
                     bbox = layer.LatLongBoundingBox()  
                     if bbox is not None:  
                         self.AppendItem(layeritem,  
                                         ("Extent (lat-lon): (%g, %g, %g, %g)"  
                                          % bbox))  
                     else:  
                         self.AppendItem(layeritem, ("Extent (lat-lon):"))  
                     self.AppendItem(layeritem,  
                                     "Shapetype: %s"  
                                     % shapetype_names[layer.ShapeType()])  
                     self.AppendItem(layeritem,  
                                     "Fill: " + color_string(layer.fill))  
                     self.AppendItem(layeritem,  
                                     "Outline: " + color_string(layer.stroke))  
                 self.Expand(layeritem)  
             self.Expand(mapitem)  
85          self.Expand(root)          self.Expand(root)
86            # select the selected layer
87            selected_layer = self.app.interactor.selected_layer
88            if selected_layer is not None:
89                # One would expect that the selected_layer's id is in
90                # layer_to_item at this point as we've just rebuilt that
91                # mapping completely. However, when a new session is loaded
92                # for instance, it can happen that the tree view is updated
93                # before the interactor in which case selected_layer may be
94                # a layer of the old session.
95                item = self.layer_to_item.get(id(selected_layer))
96                if item is not None:
97                    self.SelectItem(item)
98    
99        def add_items(self, parent, items):
100            for item in items:
101                if hasattr(item, "TreeInfo"):
102                    # Supports the TreeInfo protocol
103                    info = item.TreeInfo()
104                    treeitem = self.AppendItem(parent, info[0])
105                    self.SetPyData(treeitem, item)
106                    self.add_items(treeitem, info[1])
107                    self.Expand(treeitem)
108                    if isinstance(item, Layer):
109                        self.layer_to_item[id(item)] = treeitem
110                elif isinstance(item, StringType):
111                    # it's a string
112                    # FIXME: What to do about UNICODE
113                    self.AppendItem(parent, item)
114                else:
115                    # assume its a sequence (title, items)
116                    treeitem = self.AppendItem(parent, item[0])
117                    self.add_items(treeitem, item[1])
118                    self.Expand(treeitem)
119    
120      def session_changed(self, *args):      def session_changed(self, *args):
121          new_session = self.app.session          new_session = self.app.session
122          # if the session has changed subscribe/unsubscribe          # if the session has changed subscribe/unsubscribe
123          if self.session is not new_session:          if self.session is not new_session:
124              if self.session is not None:              if self.session is not None:
125                  for channel in self.session_channels:                  self.session.Unsubscribe(CHANGED, self.update_tree)
                     self.session.Unsubscribe(channel, self.update_tree)  
126              if new_session is not None:              if new_session is not None:
127                  for channel in self.session_channels:                  new_session.Subscribe(CHANGED, self.update_tree)
                     new_session.Subscribe(channel, self.update_tree)  
128              self.session = new_session              self.session = new_session
129          self.update_tree()          self.update_tree()
130    
# Line 150  class SessionTreeCtrl(wxTreeCtrl): Line 136  class SessionTreeCtrl(wxTreeCtrl):
136              if isinstance(object, Layer) or isinstance(object, Map):              if isinstance(object, Layer) or isinstance(object, Map):
137                  break                  break
138              item = self.GetItemParent(item)              item = self.GetItemParent(item)
139            else:
140                # No layer or map was found in the chain of parents, so
141                # there's nothing we can do.
142                return
143    
144          self.changing_selection = 1          self.changing_selection = 1
145          try:          try:
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