/[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 2051 by frank, Wed Jan 21 17:09:15 2004 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          self.path={"data":".", "projection":"."}
65            return True
66    
67      def OnExit(self):      def OnExit(self):
68          """Clean up code.          """Clean up code.
# Line 64  class ThubanApplication(wxApp, Publisher Line 70  class ThubanApplication(wxApp, Publisher
70          Extend this in derived classes if needed.          Extend this in derived classes if needed.
71          """          """
72          self.session.Destroy()          self.session.Destroy()
73          self.interactor.Destroy()          self.session = None
74          Publisher.Destroy(self)          Publisher.Destroy(self)
75    
     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()  
   
76      def read_startup_files(self):      def read_startup_files(self):
77          """Read the startup files."""          """Read the startup files."""
78          # for now the startup file is ~/.thuban/thubanstart.py          # for now the startup file is ~/.thuban/thubanstart.py
79          dir =os.path.expanduser("~/.thuban")          dir = get_application_dir()
80          if os.path.isdir(dir):          if os.path.isdir(dir):
81              sys.path.append(dir)              sys.path.append(dir)
82              try:              try:
# Line 91  class ThubanApplication(wxApp, Publisher Line 88  class ThubanApplication(wxApp, Publisher
88                          # The ImportError exception was raised from                          # The ImportError exception was raised from
89                          # inside the thubanstart module.                          # inside the thubanstart module.
90                          sys.stderr.write(_("Cannot import the thubanstart"                          sys.stderr.write(_("Cannot import the thubanstart"
91                                           "module\n"))                                           " module\n"))
92                          traceback.print_exc(None, sys.stderr)                          traceback.print_exc(None, sys.stderr)
93                      else:                      else:
94                          # There's no thubanstart module.                          # There's no thubanstart module.
# Line 132  class ThubanApplication(wxApp, Publisher Line 129  class ThubanApplication(wxApp, Publisher
129          also arranges for ShowMainWindow to be called at the appropriate          also arranges for ShowMainWindow to be called at the appropriate
130          time.          time.
131          """          """
132          self.top.Show(true)          self.top.Show(True)
133          
134      def CreateMainWindow(self):      def CreateMainWindow(self):
135          """Create and return the main window for the application.          """Create and return the main window for the application.
136    
137          Override this in subclasses to instantiate the Thuban mainwindow          Override this in subclasses to instantiate the Thuban mainwindow
138          with different parameters or to use a different class for the          with different parameters or to use a different class for the
139          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.  
140          """          """
141          msg = (_("This is the wxPython-based Graphical User Interface"          msg = (_("This is the wxPython-based Graphical User Interface"
142                 " for exploring geographic data"))                 " for exploring geographic data"))
143          return mainwindow.MainWindow(NULL, -1, "Thuban", self, self.interactor,          return mainwindow.MainWindow(NULL, -1, "Thuban", self, None,
144                                       initial_message = msg)                                       initial_message = msg,
145                                         size = (600, 400))
146    
147      def Session(self):      def Session(self):
148          """Return the application's session object"""          """Return the application's session object"""
# Line 166  class ThubanApplication(wxApp, Publisher Line 160  class ThubanApplication(wxApp, Publisher
160          self.session = session          self.session = session
161          self.subscribe_session(self.session)          self.subscribe_session(self.session)
162          self.issue(SESSION_REPLACED)          self.issue(SESSION_REPLACED)
         self.interactor.SetSession(session)  
163          self.maps_changed()          self.maps_changed()
164          if oldsession is not None:          if oldsession is not None:
165              self.unsubscribe_session(oldsession)              self.unsubscribe_session(oldsession)
166              oldsession.Destroy()              oldsession.Destroy()
167    
168        def SetPath(self, group, filename):
169            """Store the application's default path for file dialogs extracted
170            from a given filename.
171            """
172            self.path[group] = os.path.dirname( filename )
173    
174        def Path(self, group):
175            """Return the application's default path for file dialogs."""
176            return self.path[group]
177    
178      def subscribe_session(self, session):      def subscribe_session(self, session):
179          """Subscribe to some of the sessions channels.          """Subscribe to some of the sessions channels.
180    
# Line 198  class ThubanApplication(wxApp, Publisher Line 201  class ThubanApplication(wxApp, Publisher
201          """          """
202          self.SetSession(create_empty_session())          self.SetSession(create_empty_session())
203    
204      def OpenSession(self, filename):      def OpenSession(self, filename, db_connection_callback = None):
205          session = load_session(filename)          """Open the session in the file named filename"""
206            # Make sure we deal with an absolute pathname. Otherwise we can
207            # get problems when saving because the saving code expects an
208            # absolute directory name
209            filename = os.path.abspath(filename)
210            if db_connection_callback is None:
211                db_connection_callback = self.run_db_param_dialog
212            try:
213                session = load_session(filename,
214                                   db_connection_callback=db_connection_callback)
215            except LoadCancelled:
216                return
217          session.SetFilename(filename)          session.SetFilename(filename)
218          session.UnsetModified()          session.UnsetModified()
219          self.SetSession(session)          self.SetSession(session)
220    
221            for map in session.Maps():
222                for layer in map.Layers():
223                    if isinstance(layer, RasterLayer) \
224                        and not Thuban.Model.resource.has_gdal_support():
225                        msg = _("The current session contains Image layers,\n"
226                                "but the GDAL library is not available to "
227                                "draw them.")
228                        dlg = wx.wxMessageDialog(None,
229                                                 msg,
230                                                 _("Library not available"),
231                                                 wx.wxOK | wx.wxICON_INFORMATION)
232                        print msg
233                        dlg.ShowModal()
234                        dlg.Destroy()
235                        break
236    
237        def run_db_param_dialog(self, parameters, message):
238            """Implementation of the db_connection_callback for loading sessions"""
239            dlg = dbdialog.DBDialog(None, _("DB Connection Parameters"),
240                                    parameters, message)
241            return dlg.RunDialog()
242    
243    
244      def SaveSession(self):      def SaveSession(self):
245          save_session(self.session, self.session.filename)          save_session(self.session, self.session.filename)
246    
247      def maps_changed(self, *args):      def maps_changed(self, *args):
248            """Subscribed to the session's MAPS_CHANGED messages.
249    
250            Set the toplevel window's map to the map in the session. This is
251            done by calling the window's SetMap method with the map as
252            argument. If the session doesn't have any maps None is used
253            instead.
254    
255            Currently Thuban can only really handle at most one map in a
256            sessions so the first map in the session's list of maps as
257            returned by the Maps method is used.
258            """
259          if self.session.HasMaps():          if self.session.HasMaps():
260              self.top.SetMap(self.session.Maps()[0])              self.top.SetMap(self.session.Maps()[0])
261          else:          else:
262              self.top.SetMap(None)              self.top.SetMap(None)
263    
264        in_exception_dialog = 0 # flag: are we already inside the exception dialog?
265    
266        def ShowExceptionDialog(self, exc_type, exc_value, exc_traceback):
267            """Show a message box with information about an exception.
268        
269            The parameters are the usual values describing an exception in
270            Python, the exception type, the value and the traceback.
271        
272            This method can be used as a value for the sys.excepthook.
273            """
274    
275            if self.in_exception_dialog:
276                return
277            self.in_exception_dialog = 1
278            while wxIsBusy():
279                wxEndBusyCursor() # reset the mouse cursor
280    
281            try:
282                lines = traceback.format_exception(exc_type, exc_value,
283                                                exc_traceback)
284                message = _("An unhandled exception occurred:\n%s\n"
285                            "(please report to"
286                            " http://thuban.intevation.org/bugtracker.html)"
287                            "\n\n%s") % (exc_value, "".join(lines))
288                print message
289    
290                # We don't use an explicit parent here because this method might
291                # be called in circumstances where the main window doesn't exist
292                # anymore.
293                exceptiondialog.run_exception_dialog(None, message)
294    
295            finally:
296                self.in_exception_dialog = 0
297                # delete the last exception info that python keeps in
298                # sys.last_* because especially last_traceback keeps
299                # indirect references to all objects bound to local
300                # variables and this might prevent some object from being
301                # collected early enough.
302                sys.last_type = sys.last_value = sys.last_traceback = None
303    
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