/[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 2446 by frank, Mon Dec 13 11:52:34 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 altpathdialog
38    import exceptiondialog
39    
40  from messages import SESSION_REPLACED  from messages import SESSION_REPLACED
41    
# Line 49  class ThubanApplication(wxApp, Publisher Line 51  class ThubanApplication(wxApp, Publisher
51      """      """
52    
53      def OnInit(self):      def OnInit(self):
54          sys.excepthook = show_exception_dialog          sys.excepthook = self.ShowExceptionDialog
55    
56            # Initialize instance variables before trying to create any
57            # windows.  Creating windows can start an event loop if
58            # e.g. message boxes are popped up for some reason, and event
59            # handlers, especially EVT_UPDATE_UI may want to access things
60            # from the application.
61    
62            # Defaults for the directories used in file dialogs
63            self.path={"data":".", "projection":".", "alt_path":""}
64    
65            self.session = None
66            self.top = None
67            self.create_session()
68    
69            # Create an optional splash screen and then the mainwindow
70          self.splash = self.splash_screen()          self.splash = self.splash_screen()
71          if self.splash is not None:          if self.splash is not None:
72              self.splash.Show()              self.splash.Show()
73          self.read_startup_files()          self.read_startup_files()
74          self.top = self.CreateMainWindow()          self.top = self.CreateMainWindow()
75            # The session was alredy created above and we need to get the
76            # map into the mainwindow.  maps_changed does that.
77            self.maps_changed()
78          self.SetTopWindow(self.top)          self.SetTopWindow(self.top)
79          if self.splash is None:          if self.splash is None:
80              self.ShowMainWindow()              self.ShowMainWindow()
81          self.session = None  
         self.create_session()  
82          return True          return True
83    
84      def OnExit(self):      def OnExit(self):
# Line 163  class ThubanApplication(wxApp, Publisher Line 182  class ThubanApplication(wxApp, Publisher
182              self.unsubscribe_session(oldsession)              self.unsubscribe_session(oldsession)
183              oldsession.Destroy()              oldsession.Destroy()
184    
185        def SetPath(self, group, filename):
186            """Store the application's default path for file dialogs extracted
187            from a given filename.
188            """
189            self.path[group] = os.path.dirname( filename )
190    
191        def Path(self, group):
192            """Return the application's default path for file dialogs."""
193            return self.path[group]
194    
195      def subscribe_session(self, session):      def subscribe_session(self, session):
196          """Subscribe to some of the sessions channels.          """Subscribe to some of the sessions channels.
197    
# Line 189  class ThubanApplication(wxApp, Publisher Line 218  class ThubanApplication(wxApp, Publisher
218          """          """
219          self.SetSession(create_empty_session())          self.SetSession(create_empty_session())
220    
221      def OpenSession(self, filename):      def OpenSession(self, filename, db_connection_callback = None,
222                                        shapefile_callback = None):
223          """Open the session in the file named filename"""          """Open the session in the file named filename"""
224          # Make sure we deal with an absolute pathname. Otherwise we can          # Make sure we deal with an absolute pathname. Otherwise we can
225          # get problems when saving because the saving code expects an          # get problems when saving because the saving code expects an
226          # absolute directory name          # absolute directory name
227          filename = os.path.abspath(filename)          filename = os.path.abspath(filename)
228          session = load_session(filename)          if db_connection_callback is None:
229                db_connection_callback = self.run_db_param_dialog
230            if shapefile_callback is None:
231                shapefile_callback = self.run_alt_path_dialog
232            try:
233                session = load_session(filename,
234                                   db_connection_callback=db_connection_callback,
235                                   shapefile_callback=shapefile_callback)
236            except LoadCancelled:
237                return
238          session.SetFilename(filename)          session.SetFilename(filename)
239          session.UnsetModified()          session.UnsetModified()
240          self.SetSession(session)          self.SetSession(session)
# Line 204  class ThubanApplication(wxApp, Publisher Line 243  class ThubanApplication(wxApp, Publisher
243              for layer in map.Layers():              for layer in map.Layers():
244                  if isinstance(layer, RasterLayer) \                  if isinstance(layer, RasterLayer) \
245                      and not Thuban.Model.resource.has_gdal_support():                      and not Thuban.Model.resource.has_gdal_support():
246                      msg = _("The current session contains Image layers,\n" +                      msg = _("The current session contains Image layers,\n"
247                              "but the GDAL library is not available to " +                              "but the GDAL library is not available to "
248                              "draw them.")                              "draw them.")
249                      dlg = wx.wxMessageDialog(None,                      dlg = wx.wxMessageDialog(None,
250                                               msg,                                               msg,
251                                               _("Library not available"),                                               _("Library not available"),
252                                               wx.wxOK | wx.wxICON_INFORMATION)                                               wx.wxOK | wx.wxICON_INFORMATION)
253                      print msg                      print msg
# Line 216  class ThubanApplication(wxApp, Publisher Line 255  class ThubanApplication(wxApp, Publisher
255                      dlg.Destroy()                      dlg.Destroy()
256                      break                      break
257    
258      def SaveSession(self):      def run_db_param_dialog(self, parameters, message):
259          save_session(self.session, self.session.filename)          """Implementation of the db_connection_callback for loading sessions"""
260            dlg = dbdialog.DBDialog(None, _("DB Connection Parameters"),
261                                    parameters, message)
262            return dlg.RunDialog()
263    
264        # run_alt_path_dialog: Raise a dialog to ask for an alternative path
265        # if the shapefile couldn't be found.
266        # TODO:
267        #   - Store a list of already used alternative paths and return these
268        #     iteratively (using a generator)
269        #   - How do we interact with the user to tell him we used a different
270        #     shapefile (location), mode "check"? The current approach with the
271        #     file dialog is not that comfortable.
272        #
273        def run_alt_path_dialog(self, filename, mode = None, second_try = 0):
274            """Implemetation of the shapefile_callback while loading sessions.
275            
276               This implements two modes:
277               - search: Search for an alternative path. If available from a
278                 list of alrady known paths, else interactivly by file dialog.
279                 Currently the "second_try" is important since else the user might
280                 be caught in a loop.
281               - check: Ask the user for confirmation, if a path from list has
282                 been found successful.
283    
284               Returns:
285               - fname: The full path to the (shape) file.
286               - from_list: Flags if the path was taken from list or entered
287                 manually.
288            """
289    
290      def maps_changed(self, *args):          if mode == "search":
291          if self.session.HasMaps():              if self.Path('alt_path') == "" or second_try:
292              self.top.SetMap(self.session.Maps()[0])                  dlg = altpathdialog.AltPathFileDialog(filename)
293                    fname = dlg.RunDialog()
294                    if fname is not None:
295                        self.SetPath('alt_path', fname)    
296                    from_list = 0
297                else:
298                    fname = os.path.join(self.Path('alt_path'),
299                                         os.path.basename(filename))
300                    from_list = 1
301            elif mode == "check":
302                    dlg = altpathdialog.AltPathConfirmDialog(filename)
303                    fname = dlg.RunDialog()
304                    if fname is not None:
305                        self.SetPath('alt_path', fname)
306                    from_list = 0
307          else:          else:
308              self.top.SetMap(None)              fname = None
309                from_list = 0
310            return fname, from_list
311    
 in_exception_dialog = 0 # flag: are we already inside the exception dialog?  
312    
313  def show_exception_dialog(exc_type, exc_value, exc_traceback):      def SaveSession(self):
314      """Show a message box with information about an exception.          save_session(self.session, self.session.filename)
315    
316      The parameters are the usual values describing an exception in      def maps_changed(self, *args):
317      Python, the exception type, the value and the traceback.          """Subscribed to the session's MAPS_CHANGED messages.
318    
319      This method can be used as a value for the sys.excepthook.          Set the toplevel window's map to the map in the session. This is
320      """          done by calling the window's SetMap method with the map as
321      global in_exception_dialog          argument. If the session doesn't have any maps None is used
322            instead.
323    
324            Currently Thuban can only really handle at most one map in a
325            sessions so the first map in the session's list of maps as
326            returned by the Maps method is used.
327            """
328            # The mainwindow may not have been created yet, so check whether
329            # it has been created before calling any of its methods
330            if self.top is not None:
331                if self.session.HasMaps():
332                    self.top.SetMap(self.session.Maps()[0])
333                else:
334                    self.top.SetMap(None)
335    
336        in_exception_dialog = 0 # flag: are we already inside the exception dialog?
337    
338        def ShowExceptionDialog(self, exc_type, exc_value, exc_traceback):
339            """Show a message box with information about an exception.
340        
341            The parameters are the usual values describing an exception in
342            Python, the exception type, the value and the traceback.
343        
344            This method can be used as a value for the sys.excepthook.
345            """
346    
347      if in_exception_dialog:          if self.in_exception_dialog:
348          return              return
349      in_exception_dialog = 1          self.in_exception_dialog = 1
350      while wxIsBusy():          while wxIsBusy():
351          wxEndBusyCursor() # reset the mouse cursor              wxEndBusyCursor() # reset the mouse cursor
352    
353      try:          try:
354          lines = traceback.format_exception(exc_type, exc_value,              lines = traceback.format_exception(exc_type, exc_value,
355                                             exc_traceback)                                              exc_traceback)
356          message = "An unhandled exception occurred:\n%s\n" % exc_value+\              message = _("An unhandled exception occurred:\n%s\n"
357                    "(please report to " \                          "(please report to"
358                    "http://thuban.intevation.org/bugtracker.html)"\                          " http://thuban.intevation.org/bugtracker.html)"
359                    "\n\n\n"+\                          "\n\n%s") % (exc_value, "".join(lines))
360                    "".join(lines)              print message
361          print message  
362                # We don't use an explicit parent here because this method might
363          # We don't use an explicit parent here because this method might              # be called in circumstances where the main window doesn't exist
364          # be called in circumstances where the main window doesn't exist              # anymore.
365          # anymore.              exceptiondialog.run_exception_dialog(None, message)
366          dlg = wxScrolledMessageDialog(None, message,  
367                                        "Thuban: Internal Error")          finally:
368          dlg.ShowModal()              self.in_exception_dialog = 0
369          dlg.Destroy()              # delete the last exception info that python keeps in
370                # sys.last_* because especially last_traceback keeps
371      finally:              # indirect references to all objects bound to local
372          in_exception_dialog = 0              # variables and this might prevent some object from being
373          # delete the last exception info that python keeps in              # collected early enough.
374          # 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  
375    
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