/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/application.py
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revision 699 by bh, Thu Apr 17 15:20:14 2003 UTC revision 1704 by jan, Wed Sep 3 07:02:36 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    
22  from Thuban.Lib.connector import Publisher  from Thuban.Lib.connector import Publisher
23    from Thuban.Lib.fileutil import get_application_dir
24    
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
31    import Thuban.Model.resource
32    
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    
41    
   
42  class ThubanApplication(wxApp, Publisher):  class ThubanApplication(wxApp, Publisher):
43    
44      """      """
# Line 44  class ThubanApplication(wxApp, Publisher Line 50  class ThubanApplication(wxApp, Publisher
50      """      """
51    
52      def OnInit(self):      def OnInit(self):
53            sys.excepthook = self.ShowExceptionDialog
54          self.splash = self.splash_screen()          self.splash = self.splash_screen()
55          if self.splash is not None:          if self.splash is not None:
56              self.splash.Show()              self.splash.Show()
# Line 62  class ThubanApplication(wxApp, Publisher Line 69  class ThubanApplication(wxApp, Publisher
69          Extend this in derived classes if needed.          Extend this in derived classes if needed.
70          """          """
71          self.session.Destroy()          self.session.Destroy()
72            self.session = None
73          Publisher.Destroy(self)          Publisher.Destroy(self)
74    
75      def read_startup_files(self):      def read_startup_files(self):
76          """Read the startup files."""          """Read the startup files."""
77          # for now the startup file is ~/.thuban/thubanstart.py          # for now the startup file is ~/.thuban/thubanstart.py
78          dir =os.path.expanduser("~/.thuban")          dir = get_application_dir()
79          if os.path.isdir(dir):          if os.path.isdir(dir):
80              sys.path.append(dir)              sys.path.append(dir)
81              try:              try:
# Line 132  class ThubanApplication(wxApp, Publisher Line 140  class ThubanApplication(wxApp, Publisher
140          msg = (_("This is the wxPython-based Graphical User Interface"          msg = (_("This is the wxPython-based Graphical User Interface"
141                 " for exploring geographic data"))                 " for exploring geographic data"))
142          return mainwindow.MainWindow(NULL, -1, "Thuban", self, None,          return mainwindow.MainWindow(NULL, -1, "Thuban", self, None,
143                                       initial_message = msg)                                       initial_message = msg,
144                                         size = (600, 400))
145    
146      def Session(self):      def Session(self):
147          """Return the application's session object"""          """Return the application's session object"""
# Line 181  class ThubanApplication(wxApp, Publisher Line 190  class ThubanApplication(wxApp, Publisher
190          """          """
191          self.SetSession(create_empty_session())          self.SetSession(create_empty_session())
192    
193      def OpenSession(self, filename):      def OpenSession(self, filename, db_connection_callback = None):
194          """Open the session in the file named filename"""          """Open the session in the file named filename"""
195          # Make sure we deal with an absolute pathname. Otherwise we can          # Make sure we deal with an absolute pathname. Otherwise we can
196          # get problems when saving because the saving code expects an          # get problems when saving because the saving code expects an
197          # absolute directory name          # absolute directory name
198          filename = os.path.abspath(filename)          filename = os.path.abspath(filename)
199          session = load_session(filename)          if db_connection_callback is None:
200                db_connection_callback = self.run_db_param_dialog
201            try:
202                session = load_session(filename,
203                                   db_connection_callback=db_connection_callback)
204            except LoadCancelled:
205                return
206          session.SetFilename(filename)          session.SetFilename(filename)
207          session.UnsetModified()          session.UnsetModified()
208          self.SetSession(session)          self.SetSession(session)
209    
210            for map in session.Maps():
211                for layer in map.Layers():
212                    if isinstance(layer, RasterLayer) \
213                        and not Thuban.Model.resource.has_gdal_support():
214                        msg = _("The current session contains Image layers,\n"
215                                "but the GDAL library is not available to "
216                                "draw them.")
217                        dlg = wx.wxMessageDialog(None,
218                                                 msg,
219                                                 _("Library not available"),
220                                                 wx.wxOK | wx.wxICON_INFORMATION)
221                        print msg
222                        dlg.ShowModal()
223                        dlg.Destroy()
224                        break
225    
226        def run_db_param_dialog(self, parameters, message):
227            """Implementation of the db_connection_callback for loading sessions"""
228            dlg = dbdialog.DBDialog(None, _("DB Connection Parameters"),
229                                    parameters, message)
230            return dlg.RunDialog()
231    
232    
233      def SaveSession(self):      def SaveSession(self):
234          save_session(self.session, self.session.filename)          save_session(self.session, self.session.filename)
235    
# Line 200  class ThubanApplication(wxApp, Publisher Line 238  class ThubanApplication(wxApp, Publisher
238              self.top.SetMap(self.session.Maps()[0])              self.top.SetMap(self.session.Maps()[0])
239          else:          else:
240              self.top.SetMap(None)              self.top.SetMap(None)
241    
242        in_exception_dialog = 0 # flag: are we already inside the exception dialog?
243    
244        def ShowExceptionDialog(self, exc_type, exc_value, exc_traceback):
245            """Show a message box with information about an exception.
246        
247            The parameters are the usual values describing an exception in
248            Python, the exception type, the value and the traceback.
249        
250            This method can be used as a value for the sys.excepthook.
251            """
252    
253            if self.in_exception_dialog:
254                return
255            self.in_exception_dialog = 1
256            while wxIsBusy():
257                wxEndBusyCursor() # reset the mouse cursor
258    
259            try:
260                lines = traceback.format_exception(exc_type, exc_value,
261                                                exc_traceback)
262                message = _("An unhandled exception occurred:\n%s\n") % exc_value+\
263                        _("(please report to") +\
264                        " http://thuban.intevation.org/bugtracker.html)"\
265                        "\n\n\n"+\
266                        "".join(lines)
267                print message
268    
269                # We don't use an explicit parent here because this method might
270                # be called in circumstances where the main window doesn't exist
271                # anymore.
272                exceptiondialog.run_exception_dialog(None, message)
273    
274            finally:
275                self.in_exception_dialog = 0
276                # delete the last exception info that python keeps in
277                # sys.last_* because especially last_traceback keeps
278                # indirect references to all objects bound to local
279                # variables and this might prevent some object from being
280                # collected early enough.
281                sys.last_type = sys.last_value = sys.last_traceback = None
282    
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