/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/application.py
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revision 503 by jonathan, Mon Mar 10 15:12:09 2003 UTC revision 1874 by bh, Mon Oct 27 17:36:49 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    
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
 from interactor import Interactor  
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 41  class ThubanApplication(wxApp, Publisher Line 46  class ThubanApplication(wxApp, Publisher
46    
47      All wxWindows programs have to have an instance of an application      All wxWindows programs have to have an instance of an application
48      class derived from wxApp. In Thuban the application class holds      class derived from wxApp. In Thuban the application class holds
49      references to the main window, the session and the interactor.      references to the main window and the session.
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()
57          self.read_startup_files()          self.read_startup_files()
         self.interactor = Interactor(None)  
58          self.top = self.CreateMainWindow()          self.top = self.CreateMainWindow()
59          self.SetTopWindow(self.top)          self.SetTopWindow(self.top)
60          if self.splash is None:          if self.splash is None:
61              self.ShowMainWindow()              self.ShowMainWindow()
62          self.session = None          self.session = None
63          self.create_session()          self.create_session()
64          return true          return True
65    
66      def OnExit(self):      def OnExit(self):
67          """Clean up code.          """Clean up code.
# Line 64  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.interactor.Destroy()          self.session = None
73          Publisher.Destroy(self)          Publisher.Destroy(self)
74    
     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()  
   
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 91  class ThubanApplication(wxApp, Publisher Line 87  class ThubanApplication(wxApp, Publisher
87                          # The ImportError exception was raised from                          # The ImportError exception was raised from
88                          # inside the thubanstart module.                          # inside the thubanstart module.
89                          sys.stderr.write(_("Cannot import the thubanstart"                          sys.stderr.write(_("Cannot import the thubanstart"
90                                           "module\n"))                                           " module\n"))
91                          traceback.print_exc(None, sys.stderr)                          traceback.print_exc(None, sys.stderr)
92                      else:                      else:
93                          # There's no thubanstart module.                          # There's no thubanstart module.
# Line 132  class ThubanApplication(wxApp, Publisher Line 128  class ThubanApplication(wxApp, Publisher
128          also arranges for ShowMainWindow to be called at the appropriate          also arranges for ShowMainWindow to be called at the appropriate
129          time.          time.
130          """          """
131          self.top.Show(true)          self.top.Show(True)
132          
133      def CreateMainWindow(self):      def CreateMainWindow(self):
134          """Create and return the main window for the application.          """Create and return the main window for the application.
135    
136          Override this in subclasses to instantiate the Thuban mainwindow          Override this in subclasses to instantiate the Thuban mainwindow
137          with different parameters or to use a different class for the          with different parameters or to use a different class for the
138          main window.          main window.
   
         when this method is called by OnInit self.interactor (to be used  
         for the interactor argument of the standard Thuban main window  
         class) has already been instantiated.  
139          """          """
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, self.interactor,          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 166  class ThubanApplication(wxApp, Publisher Line 159  class ThubanApplication(wxApp, Publisher
159          self.session = session          self.session = session
160          self.subscribe_session(self.session)          self.subscribe_session(self.session)
161          self.issue(SESSION_REPLACED)          self.issue(SESSION_REPLACED)
         self.interactor.SetSession(session)  
162          self.maps_changed()          self.maps_changed()
163          if oldsession is not None:          if oldsession is not None:
164              self.unsubscribe_session(oldsession)              self.unsubscribe_session(oldsession)
# Line 198  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          session = load_session(filename)          """Open the session in the file named filename"""
195            # Make sure we deal with an absolute pathname. Otherwise we can
196            # get problems when saving because the saving code expects an
197            # absolute directory name
198            filename = os.path.abspath(filename)
199            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    
236      def maps_changed(self, *args):      def maps_changed(self, *args):
237            """Subscribed to the session's MAPS_CHANGED messages.
238    
239            Set the toplevel window's map to the map in the session. This is
240            done by calling the window's SetMap method with the map as
241            argument. If the session doesn't have any maps None is used
242            instead.
243    
244            Currently Thuban can only really handle at most one map in a
245            sessions so the first map in the session's list of maps as
246            returned by the Maps method is used.
247            """
248          if self.session.HasMaps():          if self.session.HasMaps():
249              self.top.SetMap(self.session.Maps()[0])              self.top.SetMap(self.session.Maps()[0])
250          else:          else:
251              self.top.SetMap(None)              self.top.SetMap(None)
252    
253        in_exception_dialog = 0 # flag: are we already inside the exception dialog?
254    
255        def ShowExceptionDialog(self, exc_type, exc_value, exc_traceback):
256            """Show a message box with information about an exception.
257        
258            The parameters are the usual values describing an exception in
259            Python, the exception type, the value and the traceback.
260        
261            This method can be used as a value for the sys.excepthook.
262            """
263    
264            if self.in_exception_dialog:
265                return
266            self.in_exception_dialog = 1
267            while wxIsBusy():
268                wxEndBusyCursor() # reset the mouse cursor
269    
270            try:
271                lines = traceback.format_exception(exc_type, exc_value,
272                                                exc_traceback)
273                message = _("An unhandled exception occurred:\n%s\n"
274                            "(please report to"
275                            " http://thuban.intevation.org/bugtracker.html)"
276                            "\n\n%s") % (exc_value, "".join(lines))
277                print message
278    
279                # We don't use an explicit parent here because this method might
280                # be called in circumstances where the main window doesn't exist
281                # anymore.
282                exceptiondialog.run_exception_dialog(None, message)
283    
284            finally:
285                self.in_exception_dialog = 0
286                # delete the last exception info that python keeps in
287                # sys.last_* because especially last_traceback keeps
288                # indirect references to all objects bound to local
289                # variables and this might prevent some object from being
290                # collected early enough.
291                sys.last_type = sys.last_value = sys.last_traceback = None
292    
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