/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/application.py
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revision 535 by bh, Fri Mar 14 20:42:18 2003 UTC revision 1650 by bh, Mon Aug 25 15:05:49 2003 UTC
# Line 13  Thuban's application object. Line 13  Thuban's application object.
13  __version__ = "$Revision$"  __version__ = "$Revision$"
14    
15  import sys, os  import sys, os
16    import os.path
17    
18  import traceback  import traceback
19    
20  from wxPython.wx import *  from wxPython.wx import *
21    from wxPython.lib.dialogs import wxScrolledMessageDialog
22    
23  from Thuban.Lib.connector import Publisher  from Thuban.Lib.connector import Publisher
24    from Thuban.Lib.fileutil import get_application_dir
25    
26  from Thuban import _  from Thuban import _
27  from Thuban.Model.session import create_empty_session  from Thuban.Model.session import create_empty_session
28  from Thuban.Model.save import save_session  from Thuban.Model.save import save_session
29  from Thuban.Model.load import load_session  from Thuban.Model.load import load_session, LoadCancelled
30  from Thuban.Model.messages import MAPS_CHANGED  from Thuban.Model.messages import MAPS_CHANGED
31    from Thuban.Model.layer import RasterLayer
32    import Thuban.Model.resource
33    
34  import view  import view
35  import tree  import tree
# Line 32  import mainwindow Line 38  import mainwindow
38  from messages import SESSION_REPLACED  from messages import SESSION_REPLACED
39    
40    
   
41  class ThubanApplication(wxApp, Publisher):  class ThubanApplication(wxApp, Publisher):
42    
43      """      """
# Line 44  class ThubanApplication(wxApp, Publisher Line 49  class ThubanApplication(wxApp, Publisher
49      """      """
50    
51      def OnInit(self):      def OnInit(self):
52            sys.excepthook = self.ShowExceptionDialog
53          self.splash = self.splash_screen()          self.splash = self.splash_screen()
54          if self.splash is not None:          if self.splash is not None:
55              self.splash.Show()              self.splash.Show()
# Line 62  class ThubanApplication(wxApp, Publisher Line 68  class ThubanApplication(wxApp, Publisher
68          Extend this in derived classes if needed.          Extend this in derived classes if needed.
69          """          """
70          self.session.Destroy()          self.session.Destroy()
71            self.session = None
72          Publisher.Destroy(self)          Publisher.Destroy(self)
73    
     def MainLoop(self):  
         """Call the inherited MainLoop method and then call OnExit.  
   
         In wxPython OnExit isn't called automatically, unfortunately, so  
         we do it here.  
         """  
         wxApp.MainLoop(self)  
         self.OnExit()  
   
74      def read_startup_files(self):      def read_startup_files(self):
75          """Read the startup files."""          """Read the startup files."""
76          # for now the startup file is ~/.thuban/thubanstart.py          # for now the startup file is ~/.thuban/thubanstart.py
77          dir =os.path.expanduser("~/.thuban")          dir = get_application_dir()
78          if os.path.isdir(dir):          if os.path.isdir(dir):
79              sys.path.append(dir)              sys.path.append(dir)
80              try:              try:
# Line 88  class ThubanApplication(wxApp, Publisher Line 86  class ThubanApplication(wxApp, Publisher
86                          # The ImportError exception was raised from                          # The ImportError exception was raised from
87                          # inside the thubanstart module.                          # inside the thubanstart module.
88                          sys.stderr.write(_("Cannot import the thubanstart"                          sys.stderr.write(_("Cannot import the thubanstart"
89                                           "module\n"))                                           " module\n"))
90                          traceback.print_exc(None, sys.stderr)                          traceback.print_exc(None, sys.stderr)
91                      else:                      else:
92                          # There's no thubanstart module.                          # There's no thubanstart module.
# Line 141  class ThubanApplication(wxApp, Publisher Line 139  class ThubanApplication(wxApp, Publisher
139          msg = (_("This is the wxPython-based Graphical User Interface"          msg = (_("This is the wxPython-based Graphical User Interface"
140                 " for exploring geographic data"))                 " for exploring geographic data"))
141          return mainwindow.MainWindow(NULL, -1, "Thuban", self, None,          return mainwindow.MainWindow(NULL, -1, "Thuban", self, None,
142                                       initial_message = msg)                                       initial_message = msg,
143                                         size = (600, 400))
144    
145      def Session(self):      def Session(self):
146          """Return the application's session object"""          """Return the application's session object"""
# Line 190  class ThubanApplication(wxApp, Publisher Line 189  class ThubanApplication(wxApp, Publisher
189          """          """
190          self.SetSession(create_empty_session())          self.SetSession(create_empty_session())
191    
192      def OpenSession(self, filename):      def OpenSession(self, filename, db_connection_callback = None):
193          session = load_session(filename)          """Open the session in the file named filename"""
194            # Make sure we deal with an absolute pathname. Otherwise we can
195            # get problems when saving because the saving code expects an
196            # absolute directory name
197            filename = os.path.abspath(filename)
198            try:
199                session = load_session(filename,
200                                   db_connection_callback=db_connection_callback)
201            except LoadCancelled:
202                return
203          session.SetFilename(filename)          session.SetFilename(filename)
204          session.UnsetModified()          session.UnsetModified()
205          self.SetSession(session)          self.SetSession(session)
206    
207            for map in session.Maps():
208                for layer in map.Layers():
209                    if isinstance(layer, RasterLayer) \
210                        and not Thuban.Model.resource.has_gdal_support():
211                        msg = _("The current session contains Image layers,\n"
212                                "but the GDAL library is not available to "
213                                "draw them.")
214                        dlg = wx.wxMessageDialog(None,
215                                                 msg,
216                                                 _("Library not available"),
217                                                 wx.wxOK | wx.wxICON_INFORMATION)
218                        print msg
219                        dlg.ShowModal()
220                        dlg.Destroy()
221                        break
222    
223      def SaveSession(self):      def SaveSession(self):
224          save_session(self.session, self.session.filename)          save_session(self.session, self.session.filename)
225    
# Line 204  class ThubanApplication(wxApp, Publisher Line 228  class ThubanApplication(wxApp, Publisher
228              self.top.SetMap(self.session.Maps()[0])              self.top.SetMap(self.session.Maps()[0])
229          else:          else:
230              self.top.SetMap(None)              self.top.SetMap(None)
231    
232        in_exception_dialog = 0 # flag: are we already inside the exception dialog?
233    
234        def ShowExceptionDialog(self, exc_type, exc_value, exc_traceback):
235            """Show a message box with information about an exception.
236        
237            The parameters are the usual values describing an exception in
238            Python, the exception type, the value and the traceback.
239        
240            This method can be used as a value for the sys.excepthook.
241            """
242    
243            if self.in_exception_dialog:
244                return
245            self.in_exception_dialog = 1
246            while wxIsBusy():
247                wxEndBusyCursor() # reset the mouse cursor
248    
249            try:
250                lines = traceback.format_exception(exc_type, exc_value,
251                                                exc_traceback)
252                message = "An unhandled exception occurred:\n%s\n" % exc_value+\
253                        "(please report to " \
254                        "http://thuban.intevation.org/bugtracker.html)"\
255                        "\n\n\n"+\
256                        "".join(lines)
257                print message
258    
259                # We don't use an explicit parent here because this method might
260                # be called in circumstances where the main window doesn't exist
261                # anymore.
262                dlg = wxScrolledMessageDialog(None, message,
263                                            "Thuban: Internal Error")
264                dlg.ShowModal()
265                dlg.Destroy()
266    
267            finally:
268                self.in_exception_dialog = 0
269                # delete the last exception info that python keeps in
270                # sys.last_* because especially last_traceback keeps
271                # indirect references to all objects bound to local
272                # variables and this might prevent some object from being
273                # collected early enough.
274                sys.last_type = sys.last_value = sys.last_traceback = None
275    
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