/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/legend.py
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revision 562 by jonathan, Wed Mar 26 11:06:22 2003 UTC revision 854 by frank, Wed May 7 18:24:13 2003 UTC
# Line 9  __version__ = "$Revision$" Line 9  __version__ = "$Revision$"
9    
10  from Thuban import _  from Thuban import _
11    
12    import resource
13    
14  from wxPython.wx import *  from wxPython.wx import *
15    
16  from Thuban.Model.layer import Layer  from Thuban.Model.layer import Layer
17  from Thuban.Model.map import Map  from Thuban.Model.map import Map
18    from Thuban.Model.scalebar import ScaleBar
19  from Thuban.Model.messages import *  from Thuban.Model.messages import *
20  from Thuban.Model.classification import ClassGroup  from Thuban.Model.classification import ClassGroup
21    
22    from Thuban.UI.messages import *
23  from Thuban.UI.classifier import ClassDataPreviewer  from Thuban.UI.classifier import ClassDataPreviewer
24  from Thuban.UI.dock import DockPanel  from Thuban.UI.dock import DockPanel
25    
26  ID_LEGEND_MOVEUP = 4001  from Thuban.Lib.connector import ConnectorError
27  ID_LEGEND_MOVEDOWN = 4002  
28    ID_LEGEND_RAISE = 4001
29    ID_LEGEND_LOWER = 4002
30  ID_LEGEND_TREE = 4003  ID_LEGEND_TREE = 4003
31  ID_LEGEND_CLASSIFY = 4004  ID_LEGEND_PROPS = 4004
32  ID_LEGEND_SHOWLAYER = 4005  ID_LEGEND_SHOWLAYER = 4005
33  ID_LEGEND_HIDELAYER = 4006  ID_LEGEND_HIDELAYER = 4006
 ID_LEGEND_DOCK = 4007  
 ID_LEGEND_UNDOCK = 4008  
34    
35  BMP_SIZE_W = 30  BMP_SIZE_W = 30
36  BMP_SIZE_H = 15  BMP_SIZE_H = 15
37    
38  #class LegendDialog(NonModalDialog):  RAISE_BMP = "raise_layer"
39    LOWER_BMP = "lower_layer"
40      #def __init__(self, parent, name, panel):  SHOW_BMP  = "show_layer"
41          #NonModalDialog.__init__(self, parent, name,  HIDE_BMP  = "hide_layer"
42                                  #_("Legend: %s") % map.Title())  PROPS_BMP = "layer_properties"
   
         ##topBox = wxBoxSizer(wxVERTICAL)  
   
         #panel = LegendPanel(self, map)  
   
         #self.panel = panel  
43    
         #topBox.Add(panel, 1, wxGROW, 4)  
44    
         ##self.SetAutoLayout(True)  
         ##self.SetSizer(topBox)  
   
     #def GetLegendPanel(self):  
         #return self.panel  
   
     #def OnClose(self, event):  
         #NonModalDialog.OnClose(self, event)  
   
         #self.panel.SetMap(None)  
       
45  class LegendPanel(DockPanel):  class LegendPanel(DockPanel):
46    
47      def __init__(self, parent, map, mainWindow):      def __init__(self, parent, map, mainWindow):
# Line 64  class LegendPanel(DockPanel): Line 50  class LegendPanel(DockPanel):
50          self.mainWindow = mainWindow          self.mainWindow = mainWindow
51          self.parent = parent          self.parent = parent
52    
         panelBox = wxBoxSizer(wxVERTICAL)  
   
         buttonBox = wxGridSizer(2, 3, 0, 0)  
   
53          self.buttons = []          self.buttons = []
54    
55          button = wxButton(self, ID_LEGEND_MOVEUP, _("Move Up"))          panelBox = wxBoxSizer(wxVERTICAL)
56          buttonBox.Add(button, 0, wxGROW | wxLEFT | wxRIGHT, 0)  
57          self.buttons.append(button)          self.toolBar = wxToolBar(self, -1)
58            self.toolBar.SetToolBitmapSize(wxSize(24, 24))
         button = wxButton(self, ID_LEGEND_SHOWLAYER, _("Show Layer"))  
         buttonBox.Add(button, 0, wxGROW | wxLEFT | wxRIGHT, 0)  
         self.buttons.append(button)  
   
         button = wxButton(self, ID_LEGEND_CLASSIFY, _("Classify"))  
         buttonBox.Add(button, 0, wxGROW | wxLEFT | wxRIGHT, 0)  
         self.buttons.append(button)  
   
         button = wxButton(self, ID_LEGEND_MOVEDOWN, _("Move Down"))  
         buttonBox.Add(button, 0, wxGROW | wxLEFT | wxRIGHT, 0)  
         self.buttons.append(button)  
   
         button = wxButton(self, ID_LEGEND_HIDELAYER, _("Hide Layer"))  
         buttonBox.Add(button, 0, wxGROW | wxLEFT | wxRIGHT, 0)  
         self.buttons.append(button)  
   
 #       button = wxButton(self, ID_LEGEND_DOCK, _("Dock"))  
 #       buttonBox.Add(button, 0, wxGROW | wxLEFT | wxRIGHT, 0)  
 #       self.buttons.append(button)  
   
 #       button = wxButton(self, ID_LEGEND_UNDOCK, _("Undock"))  
 #       buttonBox.Add(button, 0, wxGROW | wxLEFT | wxRIGHT, 0)  
 #       self.buttons.append(button)  
   
   
         EVT_BUTTON(self, ID_LEGEND_MOVEUP, self._OnMoveUp)  
         EVT_BUTTON(self, ID_LEGEND_MOVEDOWN, self._OnMoveDown)  
         EVT_BUTTON(self, ID_LEGEND_CLASSIFY, self._OnClassify)  
         EVT_BUTTON(self, ID_LEGEND_SHOWLAYER, self._OnShowLayer)  
         EVT_BUTTON(self, ID_LEGEND_HIDELAYER, self._OnHideLayer)  
         #EVT_BUTTON(self, ID_LEGEND_DOCK, self._OnDock)  
         #EVT_BUTTON(self, ID_LEGEND_UNDOCK, self._OnUndock)  
59    
60          panelBox.Add(buttonBox, 0, 0, 4)          bmp = resource.GetBitmapResource(RAISE_BMP, wxBITMAP_TYPE_XPM)
61            self.toolBar.AddTool(ID_LEGEND_RAISE, bmp,
62                shortHelpString=_("Raise Layer"))
63    
64            bmp = resource.GetBitmapResource(LOWER_BMP, wxBITMAP_TYPE_XPM)
65            self.toolBar.AddTool(ID_LEGEND_LOWER, bmp,
66                shortHelpString=_("Lower Layer"))
67    
68            bmp = resource.GetBitmapResource(SHOW_BMP, wxBITMAP_TYPE_XPM)
69            self.toolBar.AddTool(ID_LEGEND_SHOWLAYER, bmp,
70                shortHelpString=_("Show Layer"))
71    
72            bmp = resource.GetBitmapResource(HIDE_BMP, wxBITMAP_TYPE_XPM)
73            self.toolBar.AddTool(ID_LEGEND_HIDELAYER, bmp,
74                shortHelpString=_("Hide Layer"))
75    
76            bmp = resource.GetBitmapResource(PROPS_BMP, wxBITMAP_TYPE_XPM)
77            self.toolBar.AddTool(ID_LEGEND_PROPS, bmp,
78                shortHelpString=_("Edit Layer Properties"))
79    
80            self.toolBar.Realize()
81            panelBox.Add(self.toolBar, 0, wxGROW, 0)
82    
83            EVT_TOOL(self, ID_LEGEND_RAISE, self._OnMoveUp)
84            EVT_TOOL(self, ID_LEGEND_LOWER, self._OnMoveDown)
85            EVT_TOOL(self, ID_LEGEND_PROPS, self._OnProperties)
86            EVT_TOOL(self, ID_LEGEND_SHOWLAYER, self._OnShowLayer)
87            EVT_TOOL(self, ID_LEGEND_HIDELAYER, self._OnHideLayer)
88    
89          self.tree = LegendTree(self, ID_LEGEND_TREE, map, mainWindow)          self.tree = LegendTree(self, ID_LEGEND_TREE, map, mainWindow)
90    
91          panelBox.Add(self.tree, 1, wxGROW, 4)          panelBox.Add(self.tree, 1, wxGROW, 0)
92    
93            self.scalebarbitmap = ScaleBarBitmap(self, map, mainWindow)
94            panelBox.Add(self.scalebarbitmap, 0, wxGROW, 0)
95    
96          self.SetAutoLayout(True)          self.SetAutoLayout(True)
97          self.SetSizer(panelBox)          self.SetSizer(panelBox)
98          panelBox.SetSizeHints(self)          panelBox.SetSizeHints(self)
99    
         #panelBox.SetSizeHints(self.parent)  
100    
101          self.panelBox = panelBox          self.panelBox = panelBox
102    
103            self.__EnableButtons(False)
104    
105            self.Create()
106    
107            EVT_CLOSE(self, self._OnClose)
108    
109    
110      def GetMap(self):      def GetMap(self):
111          return self.tree.GetMap()          return self.tree.GetMap()
112    
113      def SetMap(self, map):      def SetMap(self, map):
114          self.tree.SetMap(map)          self.tree.SetMap(map)
115            self.scalebarbitmap.SetCanvas(self.mainWindow.canvas)
116    
117        def DoOnSelChanged(self, layer, group):
118    
119            ok = isinstance(layer, Layer)
120            self.__EnableButtons(ok)
121    
122            self.mainWindow.SelectLayer(layer)
123    
124      def DoOnSelChanged(self):      def DoOnProperties(self):
125          self.__EnableButtons(self.tree.GetSelection().IsOk())          list = self.tree.GetSelectedHierarchy()
126    
127      def _OnClassify(self, event):          ok = isinstance(list[0], Layer)
128          self.tree.DoOnClassify()          if ok:
129                self.mainWindow.OpenLayerProperties(list[0], list[1])
130    
131        def Destroy(self):
132            self.__Close()
133    
134        def _OnProperties(self, event):
135            self.DoOnProperties()
136    
137      def _OnMoveUp(self, event):      def _OnMoveUp(self, event):
138          self.tree.MoveCurrentItemUp()          self.tree.MoveCurrentItemUp()
# Line 143  class LegendPanel(DockPanel): Line 144  class LegendPanel(DockPanel):
144          self.tree.DoOnShowLayer()          self.tree.DoOnShowLayer()
145          pass          pass
146    
147        #def Close(self, force = False):
148            #DockPanel.Close(self, force)
149            
150        def _OnClose(self, event):
151            self.__Close()
152    
153      def _OnHideLayer(self, event):      def _OnHideLayer(self, event):
154          self.tree.DoOnHideLayer()          self.tree.DoOnHideLayer()
155          pass          pass
156    
     def _OnDock(self, event):  
         self.Dock()  
   
     def _OnUndock(self, event):  
         self.UnDock()  
   
157      def __EnableButtons(self, on):      def __EnableButtons(self, on):
158          for b in self.buttons:          self.toolBar.EnableTool(ID_LEGEND_RAISE, on)
159              b.Enable(on)          self.toolBar.EnableTool(ID_LEGEND_LOWER, on)
160            self.toolBar.EnableTool(ID_LEGEND_SHOWLAYER,  on)
161            self.toolBar.EnableTool(ID_LEGEND_HIDELAYER,  on)
162            self.toolBar.EnableTool(ID_LEGEND_PROPS, on)
163    
164        def __Close(self):
165            self.tree.Close()
166    
167  class LegendTree(wxTreeCtrl):  class LegendTree(wxTreeCtrl):
168    
# Line 164  class LegendTree(wxTreeCtrl): Line 171  class LegendTree(wxTreeCtrl):
171                              style = wxTR_DEFAULT_STYLE | wxTR_HIDE_ROOT,                              style = wxTR_DEFAULT_STYLE | wxTR_HIDE_ROOT,
172                              size = (200, 200))                              size = (200, 200))
173    
174            self.mainWindow = mainWindow
175          self.map = None          self.map = None
176          self.parent = parent          self.parent = parent
177          self.layer2id = None          self.layer2id = {}
   
178    
179          self.image_list = None          self.image_list = None
180          self.emptyImageIndex = 0          self.emptyImageIndex = 0
# Line 177  class LegendTree(wxTreeCtrl): Line 184  class LegendTree(wxTreeCtrl):
184          EVT_TREE_ITEM_ACTIVATED(self, ID_LEGEND_TREE, self._OnItemActivated)          EVT_TREE_ITEM_ACTIVATED(self, ID_LEGEND_TREE, self._OnItemActivated)
185          EVT_TREE_SEL_CHANGED(self, ID_LEGEND_TREE, self._OnSelChanged)          EVT_TREE_SEL_CHANGED(self, ID_LEGEND_TREE, self._OnSelChanged)
186    
187            EVT_CLOSE(self, self._OnClose)
188    
189          self.SetMap(map)          self.SetMap(map)
190    
191        def _OnClose(self, event):
192            self.SetMap(None)
193    
194      def GetMap(self):      def GetMap(self):
195          return self.map          return self.map
196    
# Line 190  class LegendTree(wxTreeCtrl): Line 202  class LegendTree(wxTreeCtrl):
202    
203          if self.map is not None:          if self.map is not None:
204              for msg, func in sub_list: self.map.Unsubscribe(msg, func)              for msg, func in sub_list: self.map.Unsubscribe(msg, func)
205                #self.mainWindow.application.Unsubscribe(SESSION_REPLACED,
206                    #self._OnMsgMapsChanged)
207                #try:
208                    #self.mainWindow.application.session.Unsubscribe(MAPS_CHANGED,
209                        #self._OnMsgMapsChanged)
210                #except ConnectorError:
211                    #pass
212              self.__DeleteAllItems()              self.__DeleteAllItems()
213                    
214          self.map = map          self.map = map
215    
216          if self.map is not None:          if self.map is not None:
217              for msg, func in sub_list: self.map.Subscribe(msg, func)              for msg, func in sub_list: self.map.Subscribe(msg, func)
218                #self.mainWindow.application.session.Subscribe(MAPS_CHANGED,
219                    #self._OnMsgMapsChanged)
220                #self.mainWindow.application.Subscribe(SESSION_REPLACED,
221                    #self._OnMsgMapsChanged)
222              self.__FillTree(self.map)              self.__FillTree(self.map)
223    
               
224      def MoveCurrentItemUp(self):      def MoveCurrentItemUp(self):
225          cur_id = self.GetSelection()          layer, group = self.GetSelectedHierarchy()
         assert(cur_id.IsOk())  
   
         cur_data = self.GetPyData(cur_id)  
   
         #prev_id = self.GetPrevSibling(cur_id)  
   
         #  
         # Get out if there's nowhere to go  
         #  
         #if prev_id == INVALID_TREE_ID: return  
226    
227          if isinstance(cur_data, Layer):          if layer is not None:
228              self.map.RaiseLayer(cur_data)              self.map.RaiseLayer(layer)
         elif isinstance(cur_data, ClassGroup):  
             pass  
229          else:          else:
230              assert(False, "Shouldn't be here.")              assert False, "Shouldn't be allowed."
231              pass              pass
232    
233      def MoveCurrentItemDown(self):      def MoveCurrentItemDown(self):
234          cur_id = self.GetSelection()          layer, group = self.GetSelectedHierarchy()
         assert(cur_id.IsOk())  
   
         cur_data = self.GetPyData(cur_id)  
235    
236          if isinstance(cur_data, Layer):          if layer is not None:
237              self.map.LowerLayer(cur_data)              self.map.LowerLayer(layer)
         elif isinstance(cur_data, ClassGroup):  
             pass  
238          else:          else:
239              assert(False, "Shouldn't be here.")              assert False, "Shouldn't be allowed."
240              pass              pass
241    
   
242      def OnCompareItems(self, item1, item2):      def OnCompareItems(self, item1, item2):
243    
244          data1 = self.GetPyData(item1)          data1 = self.GetPyData(item1)
# Line 248  class LegendTree(wxTreeCtrl): Line 252  class LegendTree(wxTreeCtrl):
252    
253    
254      def DoOnShowLayer(self):      def DoOnShowLayer(self):
255          self.__ShowHideLayer(True)          #self.__ShowHideLayer(True)
256            layer, group = self.GetSelectedHierarchy()
257            layer.SetVisible(True)
258    
259      def DoOnHideLayer(self):      def DoOnHideLayer(self):
260          self.__ShowHideLayer(False)          #self.__ShowHideLayer(False)
261            layer, group = self.GetSelectedHierarchy()
262            layer.SetVisible(False)
263    
264      def DoOnClassify(self):      def Sort(self):
265          id = self.GetSelection()          self.SortChildren(self.GetRootItem())
         assert(id.IsOk())  
         assert(id.IsOk())  
266    
267          item = self.GetPyData(id)      def GetSelectedHierarchy(self):
268          if isinstance(item, ClassGroup):          id = self.GetSelection()
             id = self.GetItemParent(id)  
             assert(id.IsOk())  
             item = self.GetPyData(id)  
269    
270          # XXX: THIS IS SUCH AWFUL STYLE! YUCK!          if not id.IsOk():
271          self.parent.mainWindow.OpenClassifier(item)              return (None, None)
         #assert(False, "XXX: FIXME HERE")  
272    
273      def Sort(self):          layer = self.GetPyData(id)
274          self.SortChildren(self.GetRootItem())          group = None
275    
276            if isinstance(layer, ClassGroup):
277                id = self.GetItemParent(id)
278                assert id.IsOk()
279                group = layer
280                layer = self.GetPyData(id)
281    
282            return (layer, group)
283    
284        def _OnMsgMapsChanged(self):
285            #print self.map is self.mainWindow.Map()
286            self.SetMap(self.mainWindow.Map())
287            
288      def _OnSelChanged(self, event):      def _OnSelChanged(self, event):
289          self.parent.DoOnSelChanged()          self.__UpdateSelection()
290    
291      def _OnItemActivated(self, event):      def _OnItemActivated(self, event):
292          self.DoOnClassify()          self.parent.DoOnProperties()
293    
294      def _OnMsgLayerChanged(self, layer):      def _OnMsgLayerChanged(self, layer):
295          assert(isinstance(layer, Layer))          assert isinstance(layer, Layer)
296    
297          id = self.layer2id[layer]          id = self.layer2id[layer]
298            assert id.IsOk()
299    
300          self.__FillTreeLayer(id)          # XXX: yikes! this is so bad, we should be doing what is
301            #      commented out, but there is a problem with keeping
302            #      track of the images in the image list when we replace
303            #      a layer. it ends up causing a seg fault.
304            self.__FillTree(self.map)
305            self.__UpdateSelection()
306            #self.__FillTreeLayer(id)
307    
308      def _OnMsgMapStackingChanged(self, *args):      def _OnMsgMapStackingChanged(self, *args):
309          self.Sort()          self.Sort()
# Line 290  class LegendTree(wxTreeCtrl): Line 311  class LegendTree(wxTreeCtrl):
311    
312          if id.IsOk():          if id.IsOk():
313              self.EnsureVisible(id)              self.EnsureVisible(id)
314            self.__UpdateSelection()
315    
316      def _OnMsgMapLayersAddedRemoved(self, map):      def _OnMsgMapLayersAddedRemoved(self, map):
317          assert(id(map) == id(self.map))          assert map is self.map
318    
319          self.__FillTree(self.map)          self.__FillTree(self.map)
320            self.__UpdateSelection()
321    
322      def __FillTree(self, map):      def _OnMsgLayerVisibilityChanged(self, layer):
323            assert isinstance(layer, Layer)
324    
325            self.__ShowHideLayer(layer)
326            self.__UpdateSelection()
327    
328          assert(isinstance(map, Map))      def _OnMsgLayerTitleChanged(self, layer):
329    
330            id = self.layer2id[layer]
331            if id.IsOk():
332                self.SetItemText(id, layer.Title())
333            self.__UpdateSelection()
334    
335        def __UpdateSelection(self):
336            layer, group = self.GetSelectedHierarchy()
337            self.parent.DoOnSelChanged(layer, group)
338            
339        def __FillTree(self, map):
340    
341          self.Freeze()          self.Freeze()
342    
# Line 325  class LegendTree(wxTreeCtrl): Line 363  class LegendTree(wxTreeCtrl):
363              for l in map.Layers():              for l in map.Layers():
364                  id = self.PrependItem(root, l.Title())                  id = self.PrependItem(root, l.Title())
365                  l.Subscribe(LAYER_CHANGED, self._OnMsgLayerChanged)                  l.Subscribe(LAYER_CHANGED, self._OnMsgLayerChanged)
366                    l.Subscribe(LAYER_VISIBILITY_CHANGED,
367                                self._OnMsgLayerVisibilityChanged)
368                    l.Subscribe(TITLE_CHANGED, self._OnMsgLayerTitleChanged)
369                  self.SetPyData(id, l)                  self.SetPyData(id, l)
370                  font = self.GetItemFont(id)                  self.__SetVisibilityStyle(l.Visible(), id)
                 if not l.Visible():  
                     font.SetStyle(wxITALIC)  
                     self.SetItemFont(id, font)  
371    
372                  self.layer2id[l] = id                  self.layer2id[l] = id
373    
# Line 349  class LegendTree(wxTreeCtrl): Line 387  class LegendTree(wxTreeCtrl):
387    
388          shapeType = layer.ShapeType()          shapeType = layer.ShapeType()
389    
390            show = layer.Visible()
391          for g in clazz:          for g in clazz:
392              id = self.AppendItem(pid, g.GetDisplayText())              if g.IsVisible():
393              self.SetPyData(id, g)                  id = self.AppendItem(pid, g.GetDisplayText())
394                    self.SetPyData(id, g)
395              bmp = self.__BuildGroupImage(g, shapeType)                  self.__SetVisibilityStyle(show, id)
396    
397              if bmp is None:                  bmp = self.__BuildGroupImage(g, shapeType)
398                  self.SetItemImage(id, self.emptyImageIndex)  
399              else:                  if bmp is None:
400                  i = self.image_list.Add(bmp)                      self.SetItemImage(id, self.emptyImageIndex)
401                  self.SetItemImage(id, i)                  else:
402                        i = self.image_list.Add(bmp)
403              #self.layer2id[g] = id                      self.SetItemImage(id, i)
404    
405          self.Thaw()          self.Thaw()
406    
407      def __BuildGroupImage(self, group, shapeType):      def __BuildGroupImage(self, group, shapeType):
         assert(isinstance(group, ClassGroup))  
408    
409          bmp = wxEmptyBitmap(BMP_SIZE_W, BMP_SIZE_H)          bmp = wxEmptyBitmap(BMP_SIZE_W, BMP_SIZE_H)
410          #brush = wxBrush(Color2wxColour(item[1]), wxSOLID)          #brush = wxBrush(Color2wxColour(item[1]), wxSOLID)
# Line 379  class LegendTree(wxTreeCtrl): Line 417  class LegendTree(wxTreeCtrl):
417          return bmp          return bmp
418    
419      def __DeleteAllItems(self):      def __DeleteAllItems(self):
420    
421            while len(self.layer2id) > 0:
422                layer, id = self.layer2id.popitem()
423                layer.Unsubscribe(LAYER_CHANGED,
424                                  self._OnMsgLayerChanged)
425                layer.Unsubscribe(LAYER_VISIBILITY_CHANGED,
426                                  self._OnMsgLayerVisibilityChanged)
427                layer.Unsubscribe(TITLE_CHANGED, self._OnMsgLayerTitleChanged)
428    
429          self.DeleteAllItems()          self.DeleteAllItems()
         self.layer2id = {}  
430    
431        def __SetVisibilityStyle(self, visible, id):
432            font = self.GetItemFont(id)
433    
434      def __ShowHideLayer(self, show):          if visible:
435          id = self.GetSelection()              font.SetStyle(wxNORMAL)
436          assert(id.IsOk())              color = wxBLACK
437            else:
438                font.SetStyle(wxITALIC)
439                color = wxLIGHT_GREY
440    
441            self.SetItemTextColour(id, color)
442            self.SetItemFont(id, font)
443                    
444          item = self.GetPyData(id)      def __ShowHideLayer(self, layer):
445          if isinstance(item, ClassGroup):          parent = self.layer2id[layer]
446              id = self.GetItemParent(id)          assert parent.IsOk()
             assert(id.IsOk())  
             item = self.GetPyData(id)  
447    
448            visible = layer.Visible()
449    
450          if show != item.Visible():          self.__SetVisibilityStyle(visible, parent)
451    
452              item.SetVisible(show)          id, cookie = self.GetFirstChild(parent, 123)
453    
454              font = self.GetItemFont(id)          while id.IsOk():
455              if show:              self.__SetVisibilityStyle(visible, id)
456                  font.SetStyle(wxNORMAL)              id, cookie = self.GetNextChild(parent, cookie)
457                  self.SetItemFont(id, font)              
458              else:  class ScaleBarBitmap(wxBoxSizer):
459                  font.SetStyle(wxITALIC)  
460                  self.SetItemFont(id, font)      def __init__(self, parent, map, mainWindow):
461            # While the width is fixed, get the height _now_.
462            dc = wxMemoryDC()
463            textwidth, textheight = dc.GetTextExtent("%d"%0)
464            self.width = 200
465            self.height = textheight + 3*2 + 8
466    
467            wxBoxSizer.__init__(self, wxVERTICAL)
468            bmp=wxEmptyBitmap(self.width, self.height)
469            self.scalebarBitmap = wxStaticBitmap(parent, -1, bmp)
470            self.Add(self.scalebarBitmap, 0, wxALIGN_CENTER|wxLEFT|wxTOP|wxRIGHT, 1)
471    
472            self.mainWindow = mainWindow
473            self.parent = parent
474            self.canvas = None
475            self.scalebar = ScaleBar(map)
476            self.SetCanvas(self.mainWindow.canvas)
477    
478        def SetCanvas(self, canvas):
479            sub_list = [(SCALE_CHANGED, self._OnMsgScaleChanged)]
480    
481            if self.canvas is not None:
482                for msg, func in sub_list: self.canvas.Unsubscribe(msg, func)
483            
484            self.canvas = canvas
485    
486            if self.canvas is not None:
487                for msg, func in sub_list: self.canvas.Subscribe(msg, func)
488                self.__SetScale(self.canvas.scale)
489    
490        def _OnMsgScaleChanged(self, scale):
491            self.__SetScale(scale)
492    
493        def __SetScale(self, scale):
494            bmp = wxEmptyBitmap(self.width, self.height)
495            dc = wxMemoryDC()
496            dc.SelectObject(bmp)
497            dc.Clear()
498    
499            self.scalebar.DrawScalebar(scale, dc)
500    
501            self.scalebarBitmap.SetBitmap(bmp)
502    
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