/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/tree.py
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revision 6 by bh, Tue Aug 28 15:41:52 2001 UTC revision 504 by jonathan, Mon Mar 10 15:12:24 2003 UTC
# Line 1  Line 1 
1  #! /usr/bin/python  #! /usr/bin/python
2  # Copyright (c) 2001 by Intevation GmbH  # Copyright (c) 2001, 2002 by Intevation GmbH
3  # Authors:  # Authors:
4  # Jan-Oliver Wagner <[email protected]>  # Jan-Oliver Wagner <[email protected]>
5  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
# Line 9  Line 9 
9    
10  __version__ = "$Revision$"  __version__ = "$Revision$"
11    
12    from types import StringType, UnicodeType
13    
14  from wxPython.wx import *  from wxPython.wx import *
15    
16  from Thuban.Model.messages import MAPS_CHANGED, MAP_PROJECTION_CHANGED, \  from Thuban import _
17       LAYERS_CHANGED, LAYER_LEGEND_CHANGED, LAYER_VISIBILITY_CHANGED  from Thuban.UI.common import *
18  from Thuban.Model.layer import Layer, shapetype_names  
19    from Thuban.Model.color import Color
20    
21    from Thuban.Model.messages import CHANGED
22    from Thuban.Model.layer import Layer
23  from Thuban.Model.map import Map  from Thuban.Model.map import Map
 import view  
24    
25  from messages import SESSION_CHANGED, SELECTED_LAYER  from dialogs import NonModalDialog
26    from messages import SESSION_REPLACED, SELECTED_LAYER
27    
28    BMP_SIZE = 15
29    
30    class SessionTreeCtrl(wxTreeCtrl):
31    
32        """Widget to display a tree view of the session.
33    
34        The tree view is created recursively from the session object. The
35        tree view calls the session's TreeInfo method which should return a
36        pair (<title>, <item>) where <title> ist the title of the session
37        item in the tree view and <items> is a list of objects to use as the
38        children of the session in the tree view.
39    
40  def color_string(color):      The items list can contain three types of items:
     if color is None:  
         return "None"  
     return "(%.3f, %.3f, %.3f)" % (color.red, color.green, color.blue)  
41    
42  class myTreeCtrlPanel(wxPanel):         1. a string. The string is used as the title for a leaf item in
43              the tree view.
44    
45           2. an object with a TreeInfo method. This method is called and
46              should return a pair just like the session's TreeInfo method.
47    
48           3. a pair (<title>, <item>) which is treated like the return
49              value of TreeInfo.
50        """
51    
52        def __init__(self, parent, ID, app):
53    
     def __init__(self, parent, app):  
54          # 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.
55          wxPanel.__init__(self, parent, -1, style=wxWANTS_CHARS)          wxTreeCtrl.__init__(self, parent, ID)
56    
57          self.app = app          self.app = app
58            # boolean to indicate that we manipulate the selection ourselves
59            # so that we can ignore the selection events generated
60            self.changing_selection = 0
61    
62          EVT_SIZE(self, self.OnSize)          # Dictionary mapping layer id's to tree items
63          self.tree = wxTreeCtrl(self, -1)          self.layer_to_item = {}
64    
65          self.app.Subscribe(SESSION_CHANGED, self.session_changed)          self.app.Subscribe(SESSION_REPLACED, self.session_changed)
66          self.app.interactor.Subscribe(SELECTED_LAYER, self.layer_selected)          self.app.interactor.Subscribe(SELECTED_LAYER, self.layer_selected)
67    
68            # the session currently displayed in the tree
69            self.session = None
70    
71            self.image_list = wxImageList(BMP_SIZE, BMP_SIZE)
72            self.AssignImageList(self.image_list)
73    
74          # pretend the session has changed to build the initial tree          # pretend the session has changed to build the initial tree
75          self.session_changed()          self.session_changed()
76    
77          EVT_TREE_SEL_CHANGED(self, self.tree.GetId(), self.OnSelChanged)          EVT_TREE_SEL_CHANGED(self, self.GetId(), self.OnSelChanged)
78    
79        def unsubscribe_all(self):
80            if self.session is not None:
81                self.session.Unsubscribe(CHANGED, self.update_tree)
82                self.session = None
83            self.app.Unsubscribe(SESSION_REPLACED, self.session_changed)
84            self.app.interactor.Unsubscribe(SELECTED_LAYER, self.layer_selected)
85    
86      def update_tree(self, *args):      def update_tree(self, *args):
87          """Clear and rebuild the tree"""          """Clear and rebuild the tree"""
88          self.tree.DeleteAllItems()          self.DeleteAllItems()
89            self.layer_to_item.clear()
90    
91          session = self.app.session          session = self.app.session
92          root = self.tree.AddRoot("Session: %s" % session.title)          info = session.TreeInfo()
93          for map in session.Maps():          root = self.AddRoot(info[0])
94              mapitem = self.tree.AppendItem(root, "Map: %s" % map.title)          self.add_items(root, info[1])
95              self.tree.SetPyData(mapitem, map)          self.Expand(root)
96              if map.projection and len(map.projection.params) > 0:          # select the selected layer
97                  projectionitem = self.tree.AppendItem(mapitem, "Projection")          selected_layer = self.app.interactor.selected_layer
98                  for param in map.projection.params:          if selected_layer is not None:
99                      parameteritem = self.tree.AppendItem(projectionitem,              # One would expect that the selected_layer's id is in
100                                                           str(param))              # layer_to_item at this point as we've just rebuilt that
101                  self.tree.Expand(projectionitem)              # mapping completely. However, when a new session is loaded
102                # for instance, it can happen that the tree view is updated
103              layers = map.Layers()              # before the interactor in which case selected_layer may be
104              for layer_index in range(len(layers) - 1, -1, -1):              # a layer of the old session.
105                  layer = layers[layer_index]              item = self.layer_to_item.get(id(selected_layer))
106                  idata = wxTreeItemData()              if item is not None:
107                  idata.SetData(layer)                  self.SelectItem(item)
108                  layeritem = self.tree.AppendItem(mapitem,  
109                                                   "Layer '%s'" % layer.Title(),      def add_items(self, parent, items):
110                                                   data = idata)  
111                  if layer is self.app.interactor.selected_layer:          if items is None: return
112                      self.tree.SelectItem(layeritem)  
113                  if isinstance(layer, Layer):          for item in items:
114                      if layer.Visible():              if hasattr(item, "TreeInfo"):
115                          text = "Shown"                  # Supports the TreeInfo protocol
116                      else:                  info = item.TreeInfo()
117                          text = "Hidden"                  treeitem = self.AppendItem(parent, info[0])
118                      self.tree.AppendItem(layeritem, text)                  self.SetPyData(treeitem, item)
119                      self.tree.AppendItem(layeritem,                  self.add_items(treeitem, info[1])
120                                           "Shapes: %d" % layer.NumShapes())                  self.Expand(treeitem)
121                      self.tree.AppendItem(layeritem,                  if isinstance(item, Layer):
122                                           ("Extents: (%g, %g, %g, %g)"                      self.layer_to_item[id(item)] = treeitem
123                                            % layer.LatLongBoundingBox()))              elif isinstance(item, StringType) or \
124                      self.tree.AppendItem(layeritem,                   isinstance(item, UnicodeType):
125                                           "Shapetype: %s" %                  # it's a string
126                                           shapetype_names[layer.ShapeType()])                  self.AppendItem(parent, item)
127                      self.tree.AppendItem(layeritem,              else:
128                                           "Fill: " + color_string(layer.fill))                  # assume its a sequence (title, items)
129                      self.tree.AppendItem(layeritem,                  if isinstance(item[1], Color):
130                                        "Outline: " + color_string(layer.stroke))  
131                  self.tree.Expand(layeritem)                      treeitem = self.AppendItem(parent, "(%s)" % item[0])
132              self.tree.Expand(mapitem)  
133          self.tree.Expand(root)                      bmp = wxEmptyBitmap(BMP_SIZE, BMP_SIZE)
134                        brush = wxBrush(Color2wxColour(item[1]), wxSOLID)
135                        dc = wxMemoryDC()
136                        dc.SelectObject(bmp)
137                        dc.SetBrush(brush)
138                        dc.Clear()
139                        dc.DrawRoundedRectangle(0, 0,
140                                                bmp.GetWidth(), bmp.GetHeight(),
141                                                4)
142                        dc.SelectObject(wxNullBitmap)
143    
144                        i = self.image_list.Add(bmp)
145                        self.SetItemImage(treeitem, i)
146                    else:
147                        treeitem = self.AppendItem(parent, item[0])
148                        self.add_items(treeitem, item[1])
149                    self.Expand(treeitem)
150    
151      def session_changed(self, *args):      def session_changed(self, *args):
152          for channel in (MAPS_CHANGED,          new_session = self.app.session
153                          MAP_PROJECTION_CHANGED,          # if the session has changed subscribe/unsubscribe
154                          LAYERS_CHANGED,          if self.session is not new_session:
155                          LAYER_LEGEND_CHANGED,              if self.session is not None:
156                          LAYER_VISIBILITY_CHANGED):                  self.session.Unsubscribe(CHANGED, self.update_tree)
157              self.app.session.Subscribe(channel, self.update_tree)              if new_session is not None:
158                    new_session.Subscribe(CHANGED, self.update_tree)
159                self.session = new_session
160          self.update_tree()          self.update_tree()
161    
     def OnSize(self, event):  
         w,h = self.GetClientSizeTuple()  
         self.tree.SetDimensions(0, 0, w, h)  
   
162      def normalize_selection(self):      def normalize_selection(self):
163          """Select the layer or map containing currently selected item"""          """Select the layer or map containing currently selected item"""
164          tree = self.tree          item = self.GetSelection()
         item = self.tree.GetSelection()  
165          while item.IsOk():          while item.IsOk():
166              object = tree.GetPyData(item)              object = self.GetPyData(item)
167              if isinstance(object, Layer) or isinstance(object, Map):              if isinstance(object, Layer) or isinstance(object, Map):
168                  break                  break
169              item = tree.GetItemParent(item)              item = self.GetItemParent(item)
170            else:
171          self.tree.SelectItem(item)              # No layer or map was found in the chain of parents, so
172                # there's nothing we can do.
173                return
174    
175            self.changing_selection = 1
176            try:
177                self.SelectItem(item)
178            finally:
179                self.changing_selection = 0
180    
181      def SelectedLayer(self):      def SelectedLayer(self):
182          """Return the layer object currently selected in the tree.          """Return the layer object currently selected in the tree.
183          Return None if no layer is selected"""          Return None if no layer is selected"""
184          tree = self.tree          layer = self.GetPyData(self.GetSelection())
         layer = tree.GetPyData(tree.GetSelection())  
185          if isinstance(layer, Layer):          if isinstance(layer, Layer):
186              return layer              return layer
187          return None          return None
188    
189      def OnSelChanged(self, event):      def OnSelChanged(self, event):
190            if self.changing_selection:
191                # we're changing the selection ourselves (probably through
192                # self.normalize_selection(). ignore the event.
193                return
194          self.normalize_selection()          self.normalize_selection()
195          layer = self.SelectedLayer()          # SelectedLayer returns None if no layer is selected. Since
196          if layer is not None:          # passing None to interactor.SelectLayer deselects the layer we
197              self.app.interactor.SelectLayer(layer)          # can simply pass the result of SelectedLayer on in all cases
198            self.app.interactor.SelectLayer(self.SelectedLayer())
199    
200      def layer_selected(self, layer):      def layer_selected(self, layer):
201          pass          item = self.layer_to_item.get(id(layer))
202            if item is not None and item != self.GetSelection():
203                self.SelectItem(item)
204    
205    
206    class SessionTreeView(NonModalDialog):
207    
208        """Non modal dialog showing the session as a tree"""
209    
210        def __init__(self, parent, app, name):
211            NonModalDialog.__init__(self, parent, app.interactor, name,
212                                    _("Session"))
213            self.tree = SessionTreeCtrl(self, -1, app)
214    
215        def OnClose(self, event):
216            NonModalDialog.OnClose(self, event)
217    
218            # if there were a way to get notified when the tree control
219            # itself is destroyed we could use that to unsubscribe instead
220            # of doing it here. (EVT_WINDOW_DESTROY doesn't seem to sent at
221            # all)
222            self.tree.unsubscribe_all()
223    
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