/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/mainwindow.py
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revision 49 by bh, Mon Sep 10 16:03:59 2001 UTC revision 299 by bh, Fri Aug 30 17:41:04 2002 UTC
# Line 1  Line 1 
1  # Copyright (C) 2001 by Intevation GmbH  # Copyright (C) 2001, 2002 by Intevation GmbH
2  # Authors:  # Authors:
3  # Jan-Oliver Wagner <[email protected]>  # Jan-Oliver Wagner <[email protected]>
4  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
# Line 12  The main window Line 12  The main window
12    
13  __version__ = "$Revision$"  __version__ = "$Revision$"
14    
15  import sys, os  import os
16    
17  from wxPython.wx import *  from wxPython.wx import *
18    
19  import Thuban  import Thuban
20  from Thuban.Model.session import Session  from Thuban.Model.session import create_empty_session
 from Thuban.Model.map import Map  
21  from Thuban.Model.layer import Layer  from Thuban.Model.layer import Layer
22  from Thuban.Model.color import Color  from Thuban.Model.color import Color
23  from Thuban.Model.proj import Projection  from Thuban.Model.proj import Projection
# Line 27  import view Line 26  import view
26  import tree  import tree
27  import proj4dialog  import proj4dialog
28  import tableview, identifyview  import tableview, identifyview
29    from menu import Menu
30    
31  import main  from context import Context
32  from command import registry, Command  from command import registry, Command
33  from messages import SELECTED_SHAPE  from messages import SELECTED_SHAPE, VIEW_POSITION
34    
35    
36  # the directory where the toolbar icons are stored  # the directory where the toolbar icons are stored
# Line 40  bitmapext = ".xpm" Line 40  bitmapext = ".xpm"
40    
41  class MainWindow(wxFrame):  class MainWindow(wxFrame):
42    
43      def __init__(self, parent, ID, interactor):      def __init__(self, parent, ID, title, application, interactor,
44          wxFrame.__init__(self, parent, ID, 'Thuban',                   initial_message = None, size = wxSize(-1, -1)):
45                           wxDefaultPosition, wxSize(400, 300))          wxFrame.__init__(self, parent, ID, title, wxDefaultPosition, size)
46    
47            self.application = application
48          self.interactor = interactor          self.interactor = interactor
49    
50          self.CreateStatusBar()          self.CreateStatusBar()
51          self.SetStatusText("This is the wxPython-based "          if initial_message:
52                        "Graphical User Interface for exploring geographic data")              self.SetStatusText(initial_message)
53    
54          self.identify_view = None          self.identify_view = None
55    
56          self.init_ids()          self.init_ids()
57    
58          menuBar = wxMenuBar()          # creat the menubar from the main_menu description
59            self.SetMenuBar(self.build_menu_bar(main_menu))
60    
61          menu = wxMenu()          # Similarly, create the toolbar from main_toolbar
62          menuBar.Append(menu, "&File");          toolbar = self.build_toolbar(main_toolbar)
         for name in ["new_session", "open_session", None,  
                      "save_session", "save_session_as", None,  
                      "exit"]:  
             self.add_menu_command(menu, name)  
   
         menu = wxMenu()  
         menuBar.Append(menu, "&Map");  
         for name in ["map_projection",  
                      None,  
                      "map_zoom_in_tool", "map_zoom_out_tool", "map_pan_tool",  
                      "map_identify_tool", "map_label_tool",  
                      None,  
                      "map_full_extent",  
                      None,  
                      "map_print"]:  
             self.add_menu_command(menu, name)  
   
         menu = wxMenu()  
         menuBar.Append(menu, "&Layer");  
         for name in ["layer_add", "layer_remove",  
                      None,  
                      "layer_fill_color", "layer_transparent_fill",  
                      "layer_ourline_color", "layer_no_outline",  
                      None,  
                      "layer_raise", "layer_lower",  
                      None,  
                      "layer_show", "layer_hide",  
                      None,  
                      "layer_show_table"]:  
             self.add_menu_command(menu, name)  
   
         menu = wxMenu()  
         menuBar.Append(menu, "&Help");  
         self.add_menu_command(menu, "help_about")  
   
         self.SetMenuBar(menuBar)  
   
         # toolbar  
         toolbar = self.CreateToolBar(wxTB_3DBUTTONS)  
         for name in ["map_zoom_in_tool", "map_zoom_out_tool", "map_pan_tool",  
                      "map_identify_tool", "map_label_tool"]:  
             self.add_toolbar_command(toolbar, name)  
63          # call Realize to make sure that the tools appear.          # call Realize to make sure that the tools appear.
64          toolbar.Realize()          toolbar.Realize()
65    
66          # Create the map canvas          # Create the map canvas
67          canvas = view.MapCanvas(self, -1, interactor)          canvas = view.MapCanvas(self, -1, interactor)
68            canvas.Subscribe(VIEW_POSITION, self.view_position_changed)
69          self.canvas = canvas          self.canvas = canvas
70    
71          self.init_dialogs()          self.init_dialogs()
# Line 118  class MainWindow(wxFrame): Line 79  class MainWindow(wxFrame):
79          self.current_id = 6000          self.current_id = 6000
80          self.id_to_name = {}          self.id_to_name = {}
81          self.name_to_id = {}          self.name_to_id = {}
82            self.events_bound = {}
83    
84      def get_id(self, name):      def get_id(self, name):
85          """Return the wxWindows id for the command named name.          """Return the wxWindows id for the command named name.
# Line 130  class MainWindow(wxFrame): Line 92  class MainWindow(wxFrame):
92              self.name_to_id[name] = ID              self.name_to_id[name] = ID
93              self.id_to_name[ID] = name              self.id_to_name[ID] = name
94          return ID          return ID
95            
96        def bind_command_events(self, command, ID):
97            """Bind the necessary events for the given command and ID"""
98            if not self.events_bound.has_key(ID):
99                # the events haven't been bound yet
100                EVT_MENU(self, ID, self.invoke_command)
101                if command.IsDynamic():
102                    EVT_UPDATE_UI(self, ID, self.update_command_ui)
103    
104        def build_menu_bar(self, menudesc):
105            """Build and return the menu bar from the menu description"""
106            menu_bar = wxMenuBar()
107    
108            for item in menudesc.items:
109                # here the items must all be Menu instances themselves
110                menu_bar.Append(self.build_menu(item), item.title)
111    
112            return menu_bar
113    
114        def build_menu(self, menudesc):
115            """Build and return a wxMenu from a menudescription"""
116            wxmenu = wxMenu()
117            last = None
118            for item in menudesc.items:
119                # here the items must all be Menu instances themselves
120                if item is None:
121                    # a separator. Only add one if the last item was not a
122                    # separator
123                    if last is not None:
124                        wxmenu.AppendSeparator()
125                elif isinstance(item, Menu):
126                    # a submenu
127                    wxmenu.AppendMenu(wxNewId(), item.title, self.build_menu(item))
128                else:
129                    # must the name the name of a command
130                    self.add_menu_command(wxmenu, item)
131                last = item
132            return wxmenu
133    
134        def build_toolbar(self, toolbardesc):
135            """Build and return the main toolbar window from a toolbar description
136    
137            The parameter should be an instance of the Menu class but it
138            should not contain submenus.
139            """
140            toolbar = self.CreateToolBar(wxTB_3DBUTTONS)
141    
142            # set the size of the tools' bitmaps. Not needed on wxGTK, but
143            # on Windows, although it doesn't work very well there. It seems
144            # that only 16x16 icons are really supported on windows.
145            # We probably shouldn't hardwire the bitmap size here.
146            toolbar.SetToolBitmapSize(wxSize(24, 24))
147    
148            for item in toolbardesc.items:
149                if item is None:
150                    toolbar.AddSeparator()
151                else:
152                    # assume it's a string.
153                    self.add_toolbar_command(toolbar, item)
154    
155            return toolbar
156    
157      def add_menu_command(self, menu, name):      def add_menu_command(self, menu, name):
158          """Add the command with name name to the menu menu.          """Add the command with name name to the menu menu.
159    
# Line 144  class MainWindow(wxFrame): Line 167  class MainWindow(wxFrame):
167                  ID = self.get_id(name)                  ID = self.get_id(name)
168                  menu.Append(ID, command.Title(), command.HelpText(),                  menu.Append(ID, command.Title(), command.HelpText(),
169                              command.IsCheckCommand())                              command.IsCheckCommand())
170                  EVT_MENU(self, ID, self.invoke_command)                  self.bind_command_events(command, ID)
                 if command.IsDynamic():  
                     EVT_UPDATE_UI(self, ID, self.update_command_ui)  
171              else:              else:
172                  print "Unknown command %s" % name                  print "Unknown command %s" % name
173    
# Line 168  class MainWindow(wxFrame): Line 189  class MainWindow(wxFrame):
189                  toolbar.AddTool(ID, bitmap,                  toolbar.AddTool(ID, bitmap,
190                                  shortHelpString = command.HelpText(),                                  shortHelpString = command.HelpText(),
191                                  isToggle = command.IsCheckCommand())                                  isToggle = command.IsCheckCommand())
192                    self.bind_command_events(command, ID)
193              else:              else:
194                  print "Unknown command %s" % name                  print "Unknown command %s" % name
195    
196        def Context(self):
197            """Return the context object for a command invoked from this window
198            """
199            return Context(self.application, self.application.Session(), self)
200    
201      def invoke_command(self, event):      def invoke_command(self, event):
202          name = self.id_to_name.get(event.GetId())          name = self.id_to_name.get(event.GetId())
203          if name is not None:          if name is not None:
204              command = registry.Command(name)              command = registry.Command(name)
205              command.Execute(self)              command.Execute(self.Context())
206          else:          else:
207              print "Unknown command ID %d" % event.GetId()              print "Unknown command ID %d" % event.GetId()
208    
209      def update_command_ui(self, event):      def update_command_ui(self, event):
210          #print "update_command_ui", self.id_to_name[event.GetId()]          #print "update_command_ui", self.id_to_name[event.GetId()]
211            context = self.Context()
212          command = registry.Command(self.id_to_name[event.GetId()])          command = registry.Command(self.id_to_name[event.GetId()])
213          if command is not None:          if command is not None:
214              event.Enable(command.Sensitive(self))              event.Enable(command.Sensitive(context))
215              event.SetText(command.DynText(self))              event.SetText(command.DynText(context))
216              if command.IsCheckCommand():              if command.IsCheckCommand():
217                  event.Check(command.Checked(self))                  event.Check(command.Checked(context))
218    
219      def RunMessageBox(self, title, text, flags = wxOK | wxICON_INFORMATION):      def RunMessageBox(self, title, text, flags = wxOK | wxICON_INFORMATION):
220          """Run a modla message box with the given text, title and flags          """Run a modal message box with the given text, title and flags
221          and return the result"""          and return the result"""
222          dlg = wxMessageDialog(self, text, title, flags)          dlg = wxMessageDialog(self, text, title, flags)
223          result = dlg.ShowModal()          result = dlg.ShowModal()
# Line 217  class MainWindow(wxFrame): Line 245  class MainWindow(wxFrame):
245      def get_open_dialog(self, name):      def get_open_dialog(self, name):
246          return self.dialogs.get(name)          return self.dialogs.get(name)
247    
248        def view_position_changed(self):
249            pos = self.canvas.CurrentPosition()
250            if pos is not None:
251                text = "(%10.10g, %10.10g)" % pos
252            else:
253                text = ""
254            self.SetStatusText(text)
255    
256        def save_modified_session(self, can_veto = 1):
257            """If the current session has been modified, ask the user
258            whether to save it and do so if requested. Return the outcome of
259            the dialog (either wxID_OK, wxID_CANCEL or wxID_NO). If the
260            dialog wasn't run return wxID_NO.
261    
262            If the can_veto parameter is true (default) the dialog includes
263            a cancel button, otherwise not.
264            """
265            if self.application.session.WasModified():
266                flags = wxYES_NO | wxICON_QUESTION
267                if can_veto:
268                    flags = flags | wxCANCEL
269                result = self.RunMessageBox("Exit",
270                                            ("The session has been modified."
271                                             " Do you want to save it?"),
272                                            flags)
273                if result == wxID_YES:
274                    self.SaveSession()
275            else:
276                result = wxID_NO
277            return result
278    
279      def NewSession(self):      def NewSession(self):
280          session = Session("")          self.save_modified_session()
281          session.AddMap(Map(""))          self.application.SetSession(create_empty_session())
         main.app.SetSession(session)  
282    
283      def OpenSession(self):      def OpenSession(self):
284            self.save_modified_session()
285          dlg = wxFileDialog(self, "Select a session file", ".", "",          dlg = wxFileDialog(self, "Select a session file", ".", "",
286                             "*.session", wxOPEN)                             "*.thuban", wxOPEN)
287          if dlg.ShowModal() == wxID_OK:          if dlg.ShowModal() == wxID_OK:
288              main.app.OpenSession(dlg.GetPath())              self.application.OpenSession(dlg.GetPath())
289          dlg.Destroy()          dlg.Destroy()
290    
291      def SaveSession(self):      def SaveSession(self):
292          main.app.SaveSession()          if self.application.session.filename == None:
293                self.SaveSessionAs()
294            self.application.SaveSession()
295    
296      def SaveSessionAs(self):      def SaveSessionAs(self):
297          dlg = wxFileDialog(self, "Enter a filename for session", ".", "",          dlg = wxFileDialog(self, "Enter a filename for session", ".", "",
298                             "*.session", wxOPEN)                             "*.thuban", wxOPEN)
299          if dlg.ShowModal() == wxID_OK:          if dlg.ShowModal() == wxID_OK:
300              main.app.session.SetFilename(dlg.GetPath())              self.application.session.SetFilename(dlg.GetPath())
301              main.app.SaveSession()              self.application.SaveSession()
302          dlg.Destroy()          dlg.Destroy()
303    
304      def Exit(self):      def Exit(self):
305          self.Close(false)          self.Close(false)
306    
307      def OnClose(self, event):      def OnClose(self, event):
308          veto = 0          result = self.save_modified_session(can_veto = event.CanVeto())
309          if main.app.session.WasModified():          if result == wxID_CANCEL:
             flags = wxYES_NO | wxICON_QUESTION  
             if event.CanVeto():  
                 flags = flags | wxCANCEL  
             result = self.RunMessageBox("Exit",  
                                         ("The session has been modified."  
                                          " Do you want to save it?"),  
                                         flags)  
             if result == wxID_YES:  
                 self.SaveSession()  
             elif result == wxID_CANCEL:  
                 veto = 1  
   
         if veto:  
310              event.Veto()              event.Veto()
311          else:          else:
312              self.Destroy()              self.Destroy()
# Line 270  class MainWindow(wxFrame): Line 318  class MainWindow(wxFrame):
318          name = "session_tree"          name = "session_tree"
319          dialog = self.get_open_dialog(name)          dialog = self.get_open_dialog(name)
320          if dialog is None:          if dialog is None:
321              dialog = tree.SessionTreeView(self, main.app, name)              dialog = tree.SessionTreeView(self, self.application, name)
322              self.add_dialog(name, dialog)              self.add_dialog(name, dialog)
323              dialog.Show(true)              dialog.Show(true)
324          else:          else:
# Line 286  class MainWindow(wxFrame): Line 334  class MainWindow(wxFrame):
334                             wxOK | wxICON_INFORMATION)                             wxOK | wxICON_INFORMATION)
335    
336      def AddLayer(self):      def AddLayer(self):
337          dlg = wxFileDialog(self, "Select a session file", ".", "", "*.*",          dlg = wxFileDialog(self, "Select a data file", ".", "", "*.*",
338                             wxOPEN)                             wxOPEN)
339          if dlg.ShowModal() == wxID_OK:          if dlg.ShowModal() == wxID_OK:
340              filename = dlg.GetPath()              filename = dlg.GetPath()
# Line 312  class MainWindow(wxFrame): Line 360  class MainWindow(wxFrame):
360          if layer is not None:          if layer is not None:
361              self.canvas.Map().RemoveLayer(layer)              self.canvas.Map().RemoveLayer(layer)
362    
363        def CanRemoveLayer(self):
364            """Return true if the currently selected layer can be deleted.
365    
366            If no layer is selected return false.
367    
368            The return value of this method determines whether the remove
369            layer command is sensitive in menu.
370            """
371            layer = self.current_layer()
372            if layer is not None:
373                return self.canvas.Map().CanRemoveLayer(layer)
374            return 0
375    
376      def RaiseLayer(self):      def RaiseLayer(self):
377          layer = self.current_layer()          layer = self.current_layer()
378          if layer is not None:          if layer is not None:
379              self.canvas.Map().RaiseLayer(layer)              self.canvas.Map().RaiseLayer(layer)
380            
381      def LowerLayer(self):      def LowerLayer(self):
382          layer = self.current_layer()          layer = self.current_layer()
383          if layer is not None:          if layer is not None:
# Line 390  class MainWindow(wxFrame): Line 451  class MainWindow(wxFrame):
451              name = "table_view" + str(id(table))              name = "table_view" + str(id(table))
452              dialog = self.get_open_dialog(name)              dialog = self.get_open_dialog(name)
453              if dialog is None:              if dialog is None:
454                  dialog = tableview.TableFrame(self, self.interactor, name,                  dialog = tableview.LayerTableFrame(self, self.interactor, name,
455                                                "Table: %s" % layer.Title(),                                                     "Table: %s" % layer.Title(),
456                                                layer, table)                                                     layer, table)
457                  self.add_dialog(name, dialog)                  self.add_dialog(name, dialog)
458                  dialog.Show(true)                  dialog.Show(true)
459              else:              else:
# Line 403  class MainWindow(wxFrame): Line 464  class MainWindow(wxFrame):
464          map = self.canvas.Map()          map = self.canvas.Map()
465          proj = map.projection          proj = map.projection
466          if proj is None:          if proj is None:
467              proj4Dlg = proj4dialog.Proj4Dialog(NULL, None)              proj4Dlg = proj4dialog.Proj4Dialog(NULL, None, map.BoundingBox())
468          else:          else:
469              proj4Dlg = proj4dialog.Proj4Dialog(NULL, map.projection.params)              proj4Dlg = proj4dialog.Proj4Dialog(NULL, map.projection.params,
470                                                   map.BoundingBox())
471          if proj4Dlg.ShowModal() == wxID_OK:          if proj4Dlg.ShowModal() == wxID_OK:
472              params = proj4Dlg.GetParams()              params = proj4Dlg.GetParams()
473              if params is not None:              if params is not None:
# Line 455  class MainWindow(wxFrame): Line 517  class MainWindow(wxFrame):
517    
518  # Helper functions to define common command implementations  # Helper functions to define common command implementations
519  def call_method(context, methodname, *args):  def call_method(context, methodname, *args):
520      """Call the context's method methodname with args *args"""      """Call the mainwindow's method methodname with args *args"""
521      apply(getattr(context, methodname), args)      apply(getattr(context.mainwindow, methodname), args)
522    
523  def _method_command(name, title, method, helptext = "", sensitive = None):  def _method_command(name, title, method, helptext = "",
524      """Add a command implemented by a method of the context object"""                      icon = "", sensitive = None):
525        """Add a command implemented by a method of the mainwindow object"""
526      registry.Add(Command(name, title, call_method, args=(method,),      registry.Add(Command(name, title, call_method, args=(method,),
527                           helptext = helptext, sensitive = sensitive))                           helptext = helptext, icon = icon,
528                             sensitive = sensitive))
529    
530    def make_check_current_tool(toolname):
531        """Return a function that tests if the currently active tool is toolname
532    
533        The returned function can be called with the context and returns
534        true iff the currently active tool's name is toolname. It's directly
535        usable as the 'checked' callback of a command.
536        """
537        def check_current_tool(context, name=toolname):
538            return context.mainwindow.canvas.CurrentTool() == name
539        return check_current_tool
540    
541  def _tool_command(name, title, method, toolname, helptext = "",  def _tool_command(name, title, method, toolname, helptext = "",
542                    icon = ""):                    icon = ""):
543      """Add a tool command"""      """Add a tool command"""
     def check_current_tool(context, name=toolname):  
         return context.canvas.CurrentTool() == name  
544      registry.Add(Command(name, title, call_method, args=(method,),      registry.Add(Command(name, title, call_method, args=(method,),
545                           helptext = helptext, icon = icon,                           helptext = helptext, icon = icon,
546                           checked = check_current_tool))                           checked = make_check_current_tool(toolname)))
547    
548  def _has_selected_layer(context):  def _has_selected_layer(context):
549      """Return true if a layer is selected in the context"""      """Return true if a layer is selected in the context"""
550      return context.has_selected_layer()      return context.mainwindow.has_selected_layer()
551    
552    def _can_remove_layer(context):
553        return context.mainwindow.CanRemoveLayer()
554    
555    def _has_tree_window_shown(context):
556        """Return true if the tree window is shown"""
557        return context.mainwindow.get_open_dialog("session_tree") is None
558    
559  # File menu  # File menu
560  _method_command("new_session", "&New Session", "NewSession")  _method_command("new_session", "&New Session", "NewSession")
561  _method_command("open_session", "&Open Session", "OpenSession")  _method_command("open_session", "&Open Session", "OpenSession")
562  _method_command("save_session", "&Save Session", "SaveSession")  _method_command("save_session", "&Save Session", "SaveSession")
563  _method_command("save_session_as", "Save Session &As", "SaveSessionAs")  _method_command("save_session_as", "Save Session &As", "SaveSessionAs")
564    _method_command("show_session_tree", "Show Session &Tree", "ShowSessionTree",
565                    sensitive = _has_tree_window_shown)
566  _method_command("exit", "&Exit", "Exit")  _method_command("exit", "&Exit", "Exit")
567    
568  # Help menu  # Help menu
# Line 499  _tool_command("map_identify_tool", "&Ide Line 582  _tool_command("map_identify_tool", "&Ide
582                helptext = "Switch to map-mode 'identify'", icon = "identify")                helptext = "Switch to map-mode 'identify'", icon = "identify")
583  _tool_command("map_label_tool", "&Label", "LabelTool", "LabelTool",  _tool_command("map_label_tool", "&Label", "LabelTool", "LabelTool",
584                helptext = "Add/Remove labels", icon = "label")                helptext = "Add/Remove labels", icon = "label")
585  _method_command("map_full_extent", "&Full extent", "FullExtent")  _method_command("map_full_extent", "&Full extent", "FullExtent",
586                   helptext = "Full Extent", icon = "fullextent")
587  _method_command("map_print", "Prin&t", "PrintMap", helptext = "Print the map")  _method_command("map_print", "Prin&t", "PrintMap", helptext = "Print the map")
588    
589  # Layer menu  # Layer menu
590  _method_command("layer_add", "&Add", "AddLayer",  _method_command("layer_add", "&Add Layer", "AddLayer",
591                  helptext = "Add a new layer to active map")                  helptext = "Add a new layer to active map")
592  _method_command("layer_remove", "&Remove", "RemoveLayer",  _method_command("layer_remove", "&Remove Layer", "RemoveLayer",
593                  helptext = "Remove selected layer(s)",                  helptext = "Remove selected layer(s)",
594                  sensitive = _has_selected_layer)                  sensitive = _can_remove_layer)
595  _method_command("layer_fill_color", "&Fill Color", "LayerFillColor",  _method_command("layer_fill_color", "&Fill Color", "LayerFillColor",
596                  helptext = "Set the fill color of selected layer(s)",                  helptext = "Set the fill color of selected layer(s)",
597                  sensitive = _has_selected_layer)                  sensitive = _has_selected_layer)
# Line 515  _method_command("layer_transparent_fill" Line 599  _method_command("layer_transparent_fill"
599                  "LayerTransparentFill",                  "LayerTransparentFill",
600                  helptext = "Do not fill the selected layer(s)",                  helptext = "Do not fill the selected layer(s)",
601                  sensitive = _has_selected_layer)                  sensitive = _has_selected_layer)
602  _method_command("layer_ourline_color", "&Outline Color", "LayerOutlineColor",  _method_command("layer_outline_color", "&Outline Color", "LayerOutlineColor",
603                  helptext = "Set the outline color of selected layer(s)",                  helptext = "Set the outline color of selected layer(s)",
604                  sensitive = _has_selected_layer)                  sensitive = _has_selected_layer)
605  _method_command("layer_no_outline", "&No Outline", "LayerNoOutline",  _method_command("layer_no_outline", "&No Outline", "LayerNoOutline",
# Line 536  _method_command("layer_hide", "&Hide", " Line 620  _method_command("layer_hide", "&Hide", "
620  _method_command("layer_show_table", "Show Ta&ble", "LayerShowTable",  _method_command("layer_show_table", "Show Ta&ble", "LayerShowTable",
621                  helptext = "Show the selected layer's table",                  helptext = "Show the selected layer's table",
622                  sensitive = _has_selected_layer)                  sensitive = _has_selected_layer)
623    
624    
625    # the menu structure
626    main_menu = Menu("<main>", "<main>",
627                     [Menu("file", "&File",
628                           ["new_session", "open_session", None,
629                            "save_session", "save_session_as", None,
630                            "show_session_tree", None,
631                            "exit"]),
632                      Menu("map", "&Map",
633                           ["layer_add", "layer_remove",
634                            None,
635                            "map_projection",
636                            None,
637                            "map_zoom_in_tool", "map_zoom_out_tool",
638                            "map_pan_tool", "map_identify_tool", "map_label_tool",
639                            None,
640                            "map_full_extent",
641                            None,
642                            "map_print"]),
643                      Menu("layer", "&Layer",
644                           ["layer_fill_color", "layer_transparent_fill",
645                            "layer_outline_color", "layer_no_outline",
646                            None,
647                            "layer_raise", "layer_lower",
648                            None,
649                            "layer_show", "layer_hide",
650                            None,
651                            "layer_show_table"]),
652                      Menu("help", "&Help",
653                           ["help_about"])])
654    
655    # the main toolbar
656    
657    main_toolbar = Menu("<toolbar>", "<toolbar>",
658                        ["map_zoom_in_tool", "map_zoom_out_tool", "map_pan_tool",
659                         "map_identify_tool", "map_label_tool", "map_full_extent"])
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