/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/mainwindow.py

Diff of /branches/WIP-pyshapelib-bramz/Thuban/UI/mainwindow.py

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-revision 278 by bh,
Mon Aug 26 12:50:23 2002 UTC
+revision 321 by bh,
Fri Sep 13 14:21:48 2002 UTC
 Line 112 
 class MainWindow(wxFrame):
          return menu_bar
      def build_menu(self, menudesc):
-         """Build and return a wxMenu from a menudescription"""
+         """Return a wxMenu built from the menu description menudesc"""
          wxmenu = wxMenu()
          last = None
          for item in menudesc.items:
-             # here the items must all be Menu instances themselves
              if item is None:
                  # a separator. Only add one if the last item was not a
                  # separator
-Line 193 
 class MainWindow(wxFrame):
+Line 192 
 class MainWindow(wxFrame):
              else:
                  print "Unknown command %s" % name
+     def Context(self):
+         """Return the context object for a command invoked from this window
+         """
+         return Context(self.application, self.application.Session(), self)
      def invoke_command(self, event):
          name = self.id_to_name.get(event.GetId())
          if name is not None:
              command = registry.Command(name)
-             context = Context(self.application, self.application.Session(),
+             command.Execute(self.Context())
-                               self)
-             command.Execute(context)
          else:
              print "Unknown command ID %d" % event.GetId()
      def update_command_ui(self, event):
          #print "update_command_ui", self.id_to_name[event.GetId()]
-         context = Context(self.application, self.application.Session(), self)
+         context = self.Context()
          command = registry.Command(self.id_to_name[event.GetId()])
          if command is not None:
              event.Enable(command.Sensitive(context))
-Line 217 
 class MainWindow(wxFrame):
+Line 219 
 class MainWindow(wxFrame):
          """Run a modal message box with the given text, title and flags
          and return the result"""
          dlg = wxMessageDialog(self, text, title, flags)
+         dlg.CenterOnParent()
          result = dlg.ShowModal()
          dlg.Destroy()
          return result
-Line 248 
 class MainWindow(wxFrame):
+Line 251 
 class MainWindow(wxFrame):
              text = "(%10.10g, %10.10g)" % pos
          else:
              text = ""
+         self.set_position_text(text)
+     def set_position_text(self, text):
+         """Set the statusbar text showing the current position.
+         By default the text is shown in field 0 of the status bar.
+         Override this method in derived classes to put it into a
+         different field of the statusbar.
+         """
          self.SetStatusText(text)
      def save_modified_session(self, can_veto = 1):
-Line 306 
 class MainWindow(wxFrame):
+Line 318 
 class MainWindow(wxFrame):
          if result == wxID_CANCEL:
              event.Veto()
          else:
+             # FIXME: it would be better to tie the unsubscription to
+             # wx's destroy event, but that isn't implemented for wxGTK
+             # yet.
+             self.canvas.Unsubscribe(VIEW_POSITION, self.view_position_changed)
              self.Destroy()
      def SetMap(self, map):
          self.canvas.SetMap(map)
+     def Map(self):
+         """Return the map displayed by this mainwindow"""
+         return self.canvas.Map()
      def ShowSessionTree(self):
          name = "session_tree"
          dialog = self.get_open_dialog(name)
-Line 357 
 class MainWindow(wxFrame):
+Line 377 
 class MainWindow(wxFrame):
          if layer is not None:
              self.canvas.Map().RemoveLayer(layer)
+     def CanRemoveLayer(self):
+         """Return true if the currently selected layer can be deleted.
+         If no layer is selected return false.
+         The return value of this method determines whether the remove
+         layer command is sensitive in menu.
+         """
+         layer = self.current_layer()
+         if layer is not None:
+             return self.canvas.Map().CanRemoveLayer(layer)
+         return 0
      def RaiseLayer(self):
          layer = self.current_layer()
          if layer is not None:
-Line 523 
 def make_check_current_tool(toolname):
+Line 556 
 def make_check_current_tool(toolname):
      return check_current_tool
  def _tool_command(name, title, method, toolname, helptext = "",
-                   icon = ""):
+                   icon = "", sensitive = None):
      """Add a tool command"""
      registry.Add(Command(name, title, call_method, args=(method,),
                           helptext = helptext, icon = icon,
-                          checked = make_check_current_tool(toolname)))
+                          checked = make_check_current_tool(toolname),
+                          sensitive = sensitive))
  def _has_selected_layer(context):
      """Return true if a layer is selected in the context"""
      return context.mainwindow.has_selected_layer()
+ def _can_remove_layer(context):
+     return context.mainwindow.CanRemoveLayer()
  def _has_tree_window_shown(context):
      """Return true if the tree window is shown"""
      return context.mainwindow.get_open_dialog("session_tree") is None
+ def _has_visible_map(context):
+     """Return true iff theres a visible map in the mainwindow.
+     A visible map is a map with at least one visible layer."""
+     map = context.mainwindow.Map()
+     if map is not None:
+         for layer in map.Layers():
+             if layer.Visible():
+                 return 1
+     return 0
  # File menu
  _method_command("new_session", "&New Session", "NewSession")
  _method_command("open_session", "&Open Session", "OpenSession")
-Line 544 
 _method_command("save_session", "&Save S
+Line 593 
 _method_command("save_session", "&Save S
  _method_command("save_session_as", "Save Session &As", "SaveSessionAs")
  _method_command("show_session_tree", "Show Session &Tree", "ShowSessionTree",
                  sensitive = _has_tree_window_shown)
- _method_command("exit", "&Exit", "Exit")
+ _method_command("exit", "E&xit", "Exit")
  # Help menu
  _method_command("help_about", "&About", "About")
-Line 554 
 _method_command("help_about", "&About",
+Line 603 
 _method_command("help_about", "&About",
  _method_command("map_projection", "Pro&jection", "Projection")
  _tool_command("map_zoom_in_tool", "&Zoom in", "ZoomInTool", "ZoomInTool",
-               helptext = "Switch to map-mode 'zoom-in'", icon = "zoom_in")
+               helptext = "Switch to map-mode 'zoom-in'", icon = "zoom_in",
+               sensitive = _has_visible_map)
  _tool_command("map_zoom_out_tool", "Zoom &out", "ZoomOutTool", "ZoomOutTool",
-               helptext = "Switch to map-mode 'zoom-out'", icon = "zoom_out")
+               helptext = "Switch to map-mode 'zoom-out'", icon = "zoom_out",
+               sensitive = _has_visible_map)
  _tool_command("map_pan_tool", "&Pan", "PanTool", "PanTool",
-               helptext = "Switch to map-mode 'pan'", icon = "pan")
+               helptext = "Switch to map-mode 'pan'", icon = "pan",
+               sensitive = _has_visible_map)
  _tool_command("map_identify_tool", "&Identify", "IdentifyTool", "IdentifyTool",
-               helptext = "Switch to map-mode 'identify'", icon = "identify")
+               helptext = "Switch to map-mode 'identify'", icon = "identify",
+               sensitive = _has_visible_map)
  _tool_command("map_label_tool", "&Label", "LabelTool", "LabelTool",
-               helptext = "Add/Remove labels", icon = "label")
+               helptext = "Add/Remove labels", icon = "label",
+               sensitive = _has_visible_map)
  _method_command("map_full_extent", "&Full extent", "FullExtent",
-                helptext = "Full Extent", icon = "fullextent")
+                helptext = "Full Extent", icon = "fullextent",
+               sensitive = _has_visible_map)
  _method_command("map_print", "Prin&t", "PrintMap", helptext = "Print the map")
  # Layer menu
-Line 572 
 _method_command("layer_add", "&Add Layer
+Line 627 
 _method_command("layer_add", "&Add Layer
                  helptext = "Add a new layer to active map")
  _method_command("layer_remove", "&Remove Layer", "RemoveLayer",
                  helptext = "Remove selected layer(s)",
-                 sensitive = _has_selected_layer)
+                 sensitive = _can_remove_layer)
  _method_command("layer_fill_color", "&Fill Color", "LayerFillColor",
                  helptext = "Set the fill color of selected layer(s)",
                  sensitive = _has_selected_layer)

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Added in v.321
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-Removed from v.278
+Added in v.321

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