/[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 2076 by bh, Thu Feb 19 15:19:39 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()
72          self.read_startup_files()          self.read_startup_files()
73          self.top = self.CreateMainWindow()          self.top = self.CreateMainWindow()
74            # The session was alredy created above and we need to get the
75            # map into the mainwindow.  maps_changed does that.
76            self.maps_changed()
77          self.SetTopWindow(self.top)          self.SetTopWindow(self.top)
78          if self.splash is None:          if self.splash is None:
79              self.ShowMainWindow()              self.ShowMainWindow()
80          self.session = None  
         self.create_session()  
81          return True          return True
82    
83      def OnExit(self):      def OnExit(self):
# Line 163  class ThubanApplication(wxApp, Publisher Line 181  class ThubanApplication(wxApp, Publisher
181              self.unsubscribe_session(oldsession)              self.unsubscribe_session(oldsession)
182              oldsession.Destroy()              oldsession.Destroy()
183    
184        def SetPath(self, group, filename):
185            """Store the application's default path for file dialogs extracted
186            from a given filename.
187            """
188            self.path[group] = os.path.dirname( filename )
189    
190        def Path(self, group):
191            """Return the application's default path for file dialogs."""
192            return self.path[group]
193    
194      def subscribe_session(self, session):      def subscribe_session(self, session):
195          """Subscribe to some of the sessions channels.          """Subscribe to some of the sessions channels.
196    
# Line 189  class ThubanApplication(wxApp, Publisher Line 217  class ThubanApplication(wxApp, Publisher
217          """          """
218          self.SetSession(create_empty_session())          self.SetSession(create_empty_session())
219    
220      def OpenSession(self, filename):      def OpenSession(self, filename, db_connection_callback = None):
221          """Open the session in the file named filename"""          """Open the session in the file named filename"""
222          # Make sure we deal with an absolute pathname. Otherwise we can          # Make sure we deal with an absolute pathname. Otherwise we can
223          # get problems when saving because the saving code expects an          # get problems when saving because the saving code expects an
224          # absolute directory name          # absolute directory name
225          filename = os.path.abspath(filename)          filename = os.path.abspath(filename)
226          session = load_session(filename)          if db_connection_callback is None:
227                db_connection_callback = self.run_db_param_dialog
228            try:
229                session = load_session(filename,
230                                   db_connection_callback=db_connection_callback)
231            except LoadCancelled:
232                return
233          session.SetFilename(filename)          session.SetFilename(filename)
234          session.UnsetModified()          session.UnsetModified()
235          self.SetSession(session)          self.SetSession(session)
# Line 204  class ThubanApplication(wxApp, Publisher Line 238  class ThubanApplication(wxApp, Publisher
238              for layer in map.Layers():              for layer in map.Layers():
239                  if isinstance(layer, RasterLayer) \                  if isinstance(layer, RasterLayer) \
240                      and not Thuban.Model.resource.has_gdal_support():                      and not Thuban.Model.resource.has_gdal_support():
241                      msg = _("The current session contains Image layers,\n" +                      msg = _("The current session contains Image layers,\n"
242                              "but the GDAL library is not available to " +                              "but the GDAL library is not available to "
243                              "draw them.")                              "draw them.")
244                      dlg = wx.wxMessageDialog(None,                      dlg = wx.wxMessageDialog(None,
245                                               msg,                                               msg,
246                                               _("Library not available"),                                               _("Library not available"),
247                                               wx.wxOK | wx.wxICON_INFORMATION)                                               wx.wxOK | wx.wxICON_INFORMATION)
248                      print msg                      print msg
# Line 216  class ThubanApplication(wxApp, Publisher Line 250  class ThubanApplication(wxApp, Publisher
250                      dlg.Destroy()                      dlg.Destroy()
251                      break                      break
252    
253        def run_db_param_dialog(self, parameters, message):
254            """Implementation of the db_connection_callback for loading sessions"""
255            dlg = dbdialog.DBDialog(None, _("DB Connection Parameters"),
256                                    parameters, message)
257            return dlg.RunDialog()
258    
259    
260      def SaveSession(self):      def SaveSession(self):
261          save_session(self.session, self.session.filename)          save_session(self.session, self.session.filename)
262    
263      def maps_changed(self, *args):      def maps_changed(self, *args):
264          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?  
265    
266  def show_exception_dialog(exc_type, exc_value, exc_traceback):          Set the toplevel window's map to the map in the session. This is
267      """Show a message box with information about an exception.          done by calling the window's SetMap method with the map as
268            argument. If the session doesn't have any maps None is used
269      The parameters are the usual values describing an exception in          instead.
270      Python, the exception type, the value and the traceback.  
271            Currently Thuban can only really handle at most one map in a
272      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
273      """          returned by the Maps method is used.
274      global in_exception_dialog          """
275            # The mainwindow may not have been created yet, so check whether
276            # it has been created before calling any of its methods
277            if self.top is not None:
278                if self.session.HasMaps():
279                    self.top.SetMap(self.session.Maps()[0])
280                else:
281                    self.top.SetMap(None)
282    
283        in_exception_dialog = 0 # flag: are we already inside the exception dialog?
284    
285        def ShowExceptionDialog(self, exc_type, exc_value, exc_traceback):
286            """Show a message box with information about an exception.
287        
288            The parameters are the usual values describing an exception in
289            Python, the exception type, the value and the traceback.
290        
291            This method can be used as a value for the sys.excepthook.
292            """
293    
294      if in_exception_dialog:          if self.in_exception_dialog:
295          return              return
296      in_exception_dialog = 1          self.in_exception_dialog = 1
297      while wxIsBusy():          while wxIsBusy():
298          wxEndBusyCursor() # reset the mouse cursor              wxEndBusyCursor() # reset the mouse cursor
299    
300      try:          try:
301          lines = traceback.format_exception(exc_type, exc_value,              lines = traceback.format_exception(exc_type, exc_value,
302                                             exc_traceback)                                              exc_traceback)
303          message = "An unhandled exception occurred:\n%s\n" % exc_value+\              message = _("An unhandled exception occurred:\n%s\n"
304                    "(please report to " \                          "(please report to"
305                    "http://thuban.intevation.org/bugtracker.html)"\                          " http://thuban.intevation.org/bugtracker.html)"
306                    "\n\n\n"+\                          "\n\n%s") % (exc_value, "".join(lines))
307                    "".join(lines)              print message
308          print message  
309                # We don't use an explicit parent here because this method might
310          # We don't use an explicit parent here because this method might              # be called in circumstances where the main window doesn't exist
311          # be called in circumstances where the main window doesn't exist              # anymore.
312          # anymore.              exceptiondialog.run_exception_dialog(None, message)
313          dlg = wxScrolledMessageDialog(None, message,  
314                                        "Thuban: Internal Error")          finally:
315          dlg.ShowModal()              self.in_exception_dialog = 0
316          dlg.Destroy()              # delete the last exception info that python keeps in
317                # sys.last_* because especially last_traceback keeps
318      finally:              # indirect references to all objects bound to local
319          in_exception_dialog = 0              # variables and this might prevent some object from being
320          # delete the last exception info that python keeps in              # collected early enough.
321          # 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  
322    
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