/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/application.py
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revision 1504 by jonathan, Tue Jul 29 14:28:55 2003 UTC revision 2072 by bh, Tue Feb 17 13:14:49 2004 UTC
# Line 1  Line 1 
1  # Copyright (C) 2001, 2002, 2003 by Intevation GmbH  # Copyright (C) 2001, 2002, 2003, 2004 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 18  import os.path Line 18  import os.path
18  import traceback  import traceback
19    
20  from wxPython.wx import *  from wxPython.wx import *
 from wxPython.lib.dialogs import wxScrolledMessageDialog  
21    
22  from Thuban.Lib.connector import Publisher  from Thuban.Lib.connector import Publisher
23  from Thuban.Lib.fileutil import get_application_dir  from Thuban.Lib.fileutil import get_application_dir
# Line 26  from Thuban.Lib.fileutil import get_appl Line 25  from Thuban.Lib.fileutil import get_appl
25  from Thuban import _  from Thuban import _
26  from Thuban.Model.session import create_empty_session  from Thuban.Model.session import create_empty_session
27  from Thuban.Model.save import save_session  from Thuban.Model.save import save_session
28  from Thuban.Model.load import load_session  from Thuban.Model.load import load_session, LoadCancelled
29  from Thuban.Model.messages import MAPS_CHANGED  from Thuban.Model.messages import MAPS_CHANGED
30  from Thuban.Model.layer import RasterLayer  from Thuban.Model.layer import RasterLayer
31  import Thuban.Model.resource  import Thuban.Model.resource
# Line 34  import Thuban.Model.resource Line 33  import Thuban.Model.resource
33  import view  import view
34  import tree  import tree
35  import mainwindow  import mainwindow
36    import dbdialog
37    import exceptiondialog
38    
39  from messages import SESSION_REPLACED  from messages import SESSION_REPLACED
40    
# Line 49  class ThubanApplication(wxApp, Publisher Line 50  class ThubanApplication(wxApp, Publisher
50      """      """
51    
52      def OnInit(self):      def OnInit(self):
53          sys.excepthook = show_exception_dialog          sys.excepthook = self.ShowExceptionDialog
54    
55            # Initialize instance variables before trying to create any
56            # windows.  Creating windows can start an event loop if
57            # e.g. message boxes are popped up for some reason, and event
58            # handlers, especially EVT_UPDATE_UI may want to access things
59            # from the application.
60    
61            # Defaults for the directories used in file dialogs
62            self.path={"data":".", "projection":"."}
63    
64            self.session = None
65            self.top = None
66            self.create_session()
67    
68            # Create an optional splash screen and then the mainwindow
69          self.splash = self.splash_screen()          self.splash = self.splash_screen()
70          if self.splash is not None:          if self.splash is not None:
71              self.splash.Show()              self.splash.Show()
# Line 58  class ThubanApplication(wxApp, Publisher Line 74  class ThubanApplication(wxApp, Publisher
74          self.SetTopWindow(self.top)          self.SetTopWindow(self.top)
75          if self.splash is None:          if self.splash is None:
76              self.ShowMainWindow()              self.ShowMainWindow()
77          self.session = None  
         self.create_session()  
78          return True          return True
79    
80      def OnExit(self):      def OnExit(self):
# Line 163  class ThubanApplication(wxApp, Publisher Line 178  class ThubanApplication(wxApp, Publisher
178              self.unsubscribe_session(oldsession)              self.unsubscribe_session(oldsession)
179              oldsession.Destroy()              oldsession.Destroy()
180    
181        def SetPath(self, group, filename):
182            """Store the application's default path for file dialogs extracted
183            from a given filename.
184            """
185            self.path[group] = os.path.dirname( filename )
186    
187        def Path(self, group):
188            """Return the application's default path for file dialogs."""
189            return self.path[group]
190    
191      def subscribe_session(self, session):      def subscribe_session(self, session):
192          """Subscribe to some of the sessions channels.          """Subscribe to some of the sessions channels.
193    
# Line 189  class ThubanApplication(wxApp, Publisher Line 214  class ThubanApplication(wxApp, Publisher
214          """          """
215          self.SetSession(create_empty_session())          self.SetSession(create_empty_session())
216    
217      def OpenSession(self, filename):      def OpenSession(self, filename, db_connection_callback = None):
218          """Open the session in the file named filename"""          """Open the session in the file named filename"""
219          # Make sure we deal with an absolute pathname. Otherwise we can          # Make sure we deal with an absolute pathname. Otherwise we can
220          # get problems when saving because the saving code expects an          # get problems when saving because the saving code expects an
221          # absolute directory name          # absolute directory name
222          filename = os.path.abspath(filename)          filename = os.path.abspath(filename)
223          session = load_session(filename)          if db_connection_callback is None:
224                db_connection_callback = self.run_db_param_dialog
225            try:
226                session = load_session(filename,
227                                   db_connection_callback=db_connection_callback)
228            except LoadCancelled:
229                return
230          session.SetFilename(filename)          session.SetFilename(filename)
231          session.UnsetModified()          session.UnsetModified()
232          self.SetSession(session)          self.SetSession(session)
# Line 204  class ThubanApplication(wxApp, Publisher Line 235  class ThubanApplication(wxApp, Publisher
235              for layer in map.Layers():              for layer in map.Layers():
236                  if isinstance(layer, RasterLayer) \                  if isinstance(layer, RasterLayer) \
237                      and not Thuban.Model.resource.has_gdal_support():                      and not Thuban.Model.resource.has_gdal_support():
238                      msg = _("The current session contains Image layers,\n" +                      msg = _("The current session contains Image layers,\n"
239                              "but the GDAL library is not available to " +                              "but the GDAL library is not available to "
240                              "draw them.")                              "draw them.")
241                      dlg = wx.wxMessageDialog(None,                      dlg = wx.wxMessageDialog(None,
242                                               msg,                                               msg,
243                                               _("Library not available"),                                               _("Library not available"),
244                                               wx.wxOK | wx.wxICON_INFORMATION)                                               wx.wxOK | wx.wxICON_INFORMATION)
245                      print msg                      print msg
# Line 216  class ThubanApplication(wxApp, Publisher Line 247  class ThubanApplication(wxApp, Publisher
247                      dlg.Destroy()                      dlg.Destroy()
248                      break                      break
249    
250        def run_db_param_dialog(self, parameters, message):
251            """Implementation of the db_connection_callback for loading sessions"""
252            dlg = dbdialog.DBDialog(None, _("DB Connection Parameters"),
253                                    parameters, message)
254            return dlg.RunDialog()
255    
256    
257      def SaveSession(self):      def SaveSession(self):
258          save_session(self.session, self.session.filename)          save_session(self.session, self.session.filename)
259    
260      def maps_changed(self, *args):      def maps_changed(self, *args):
261          if self.session.HasMaps():          """Subscribed to the session's MAPS_CHANGED messages.
             self.top.SetMap(self.session.Maps()[0])  
         else:  
             self.top.SetMap(None)  
   
 in_exception_dialog = 0 # flag: are we already inside the exception dialog?  
262    
263  def show_exception_dialog(exc_type, exc_value, exc_traceback):          Set the toplevel window's map to the map in the session. This is
264      """Show a message box with information about an exception.          done by calling the window's SetMap method with the map as
265            argument. If the session doesn't have any maps None is used
266      The parameters are the usual values describing an exception in          instead.
267      Python, the exception type, the value and the traceback.  
268            Currently Thuban can only really handle at most one map in a
269      This method can be used as a value for the sys.excepthook.          sessions so the first map in the session's list of maps as
270      """          returned by the Maps method is used.
271      global in_exception_dialog          """
272            # The mainwindow may not have been created yet, so check whether
273            # it has been created before calling any of its methods
274            if self.top is not None:
275                if self.session.HasMaps():
276                    self.top.SetMap(self.session.Maps()[0])
277                else:
278                    self.top.SetMap(None)
279    
280        in_exception_dialog = 0 # flag: are we already inside the exception dialog?
281    
282        def ShowExceptionDialog(self, exc_type, exc_value, exc_traceback):
283            """Show a message box with information about an exception.
284        
285            The parameters are the usual values describing an exception in
286            Python, the exception type, the value and the traceback.
287        
288            This method can be used as a value for the sys.excepthook.
289            """
290    
291      if in_exception_dialog:          if self.in_exception_dialog:
292          return              return
293      in_exception_dialog = 1          self.in_exception_dialog = 1
294      while wxIsBusy():          while wxIsBusy():
295          wxEndBusyCursor() # reset the mouse cursor              wxEndBusyCursor() # reset the mouse cursor
296    
297      try:          try:
298          lines = traceback.format_exception(exc_type, exc_value,              lines = traceback.format_exception(exc_type, exc_value,
299                                             exc_traceback)                                              exc_traceback)
300          message = "An unhandled exception occurred:\n%s\n" % exc_value+\              message = _("An unhandled exception occurred:\n%s\n"
301                    "(please report to " \                          "(please report to"
302                    "http://thuban.intevation.org/bugtracker.html)"\                          " http://thuban.intevation.org/bugtracker.html)"
303                    "\n\n\n"+\                          "\n\n%s") % (exc_value, "".join(lines))
304                    "".join(lines)              print message
305          print message  
306                # We don't use an explicit parent here because this method might
307          # We don't use an explicit parent here because this method might              # be called in circumstances where the main window doesn't exist
308          # be called in circumstances where the main window doesn't exist              # anymore.
309          # anymore.              exceptiondialog.run_exception_dialog(None, message)
310          dlg = wxScrolledMessageDialog(None, message,  
311                                        "Thuban: Internal Error")          finally:
312          dlg.ShowModal()              self.in_exception_dialog = 0
313          dlg.Destroy()              # delete the last exception info that python keeps in
314                # sys.last_* because especially last_traceback keeps
315      finally:              # indirect references to all objects bound to local
316          in_exception_dialog = 0              # variables and this might prevent some object from being
317          # delete the last exception info that python keeps in              # collected early enough.
318          # sys.last_* because especially last_traceback keeps              sys.last_type = sys.last_value = sys.last_traceback = None
         # indirect references to all objects bound to local  
         # variables and this might prevent some object from being  
         # collected early enough.  
         sys.last_type = sys.last_value = sys.last_traceback = None  
319    
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