/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/application.py
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revision 765 by bh, Tue Apr 29 12:42:14 2003 UTC revision 2072 by bh, Tue Feb 17 13:14:49 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 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    
55            # Initialize instance variables before trying to create any
56            # windows.  Creating windows can start an event loop if
57            # e.g. message boxes are popped up for some reason, and event
58            # handlers, especially EVT_UPDATE_UI may want to access things
59            # from the application.
60    
61            # Defaults for the directories used in file dialogs
62            self.path={"data":".", "projection":"."}
63    
64            self.session = None
65            self.top = None
66            self.create_session()
67    
68            # Create an optional splash screen and then the mainwindow
69          self.splash = self.splash_screen()          self.splash = self.splash_screen()
70          if self.splash is not None:          if self.splash is not None:
71              self.splash.Show()              self.splash.Show()
# Line 52  class ThubanApplication(wxApp, Publisher Line 74  class ThubanApplication(wxApp, Publisher
74          self.SetTopWindow(self.top)          self.SetTopWindow(self.top)
75          if self.splash is None:          if self.splash is None:
76              self.ShowMainWindow()              self.ShowMainWindow()
77          self.session = None  
         self.create_session()  
78          return True          return True
79    
80      def OnExit(self):      def OnExit(self):
# Line 68  class ThubanApplication(wxApp, Publisher Line 89  class ThubanApplication(wxApp, Publisher
89      def read_startup_files(self):      def read_startup_files(self):
90          """Read the startup files."""          """Read the startup files."""
91          # for now the startup file is ~/.thuban/thubanstart.py          # for now the startup file is ~/.thuban/thubanstart.py
92          dir =os.path.expanduser("~/.thuban")          dir = get_application_dir()
93          if os.path.isdir(dir):          if os.path.isdir(dir):
94              sys.path.append(dir)              sys.path.append(dir)
95              try:              try:
# Line 133  class ThubanApplication(wxApp, Publisher Line 154  class ThubanApplication(wxApp, Publisher
154          msg = (_("This is the wxPython-based Graphical User Interface"          msg = (_("This is the wxPython-based Graphical User Interface"
155                 " for exploring geographic data"))                 " for exploring geographic data"))
156          return mainwindow.MainWindow(NULL, -1, "Thuban", self, None,          return mainwindow.MainWindow(NULL, -1, "Thuban", self, None,
157                                       initial_message = msg)                                       initial_message = msg,
158                                         size = (600, 400))
159    
160      def Session(self):      def Session(self):
161          """Return the application's session object"""          """Return the application's session object"""
# Line 156  class ThubanApplication(wxApp, Publisher Line 178  class ThubanApplication(wxApp, Publisher
178              self.unsubscribe_session(oldsession)              self.unsubscribe_session(oldsession)
179              oldsession.Destroy()              oldsession.Destroy()
180    
181        def SetPath(self, group, filename):
182            """Store the application's default path for file dialogs extracted
183            from a given filename.
184            """
185            self.path[group] = os.path.dirname( filename )
186    
187        def Path(self, group):
188            """Return the application's default path for file dialogs."""
189            return self.path[group]
190    
191      def subscribe_session(self, session):      def subscribe_session(self, session):
192          """Subscribe to some of the sessions channels.          """Subscribe to some of the sessions channels.
193    
# Line 182  class ThubanApplication(wxApp, Publisher Line 214  class ThubanApplication(wxApp, Publisher
214          """          """
215          self.SetSession(create_empty_session())          self.SetSession(create_empty_session())
216    
217      def OpenSession(self, filename):      def OpenSession(self, filename, db_connection_callback = None):
218          """Open the session in the file named filename"""          """Open the session in the file named filename"""
219          # Make sure we deal with an absolute pathname. Otherwise we can          # Make sure we deal with an absolute pathname. Otherwise we can
220          # get problems when saving because the saving code expects an          # get problems when saving because the saving code expects an
221          # absolute directory name          # absolute directory name
222          filename = os.path.abspath(filename)          filename = os.path.abspath(filename)
223          session = load_session(filename)          if db_connection_callback is None:
224                db_connection_callback = self.run_db_param_dialog
225            try:
226                session = load_session(filename,
227                                   db_connection_callback=db_connection_callback)
228            except LoadCancelled:
229                return
230          session.SetFilename(filename)          session.SetFilename(filename)
231          session.UnsetModified()          session.UnsetModified()
232          self.SetSession(session)          self.SetSession(session)
233    
234            for map in session.Maps():
235                for layer in map.Layers():
236                    if isinstance(layer, RasterLayer) \
237                        and not Thuban.Model.resource.has_gdal_support():
238                        msg = _("The current session contains Image layers,\n"
239                                "but the GDAL library is not available to "
240                                "draw them.")
241                        dlg = wx.wxMessageDialog(None,
242                                                 msg,
243                                                 _("Library not available"),
244                                                 wx.wxOK | wx.wxICON_INFORMATION)
245                        print msg
246                        dlg.ShowModal()
247                        dlg.Destroy()
248                        break
249    
250        def run_db_param_dialog(self, parameters, message):
251            """Implementation of the db_connection_callback for loading sessions"""
252            dlg = dbdialog.DBDialog(None, _("DB Connection Parameters"),
253                                    parameters, message)
254            return dlg.RunDialog()
255    
256    
257      def SaveSession(self):      def SaveSession(self):
258          save_session(self.session, self.session.filename)          save_session(self.session, self.session.filename)
259    
260      def maps_changed(self, *args):      def maps_changed(self, *args):
261          if self.session.HasMaps():          """Subscribed to the session's MAPS_CHANGED messages.
262              self.top.SetMap(self.session.Maps()[0])  
263          else:          Set the toplevel window's map to the map in the session. This is
264              self.top.SetMap(None)          done by calling the window's SetMap method with the map as
265            argument. If the session doesn't have any maps None is used
266            instead.
267    
268            Currently Thuban can only really handle at most one map in a
269            sessions so the first map in the session's list of maps as
270            returned by the Maps method is used.
271            """
272            # The mainwindow may not have been created yet, so check whether
273            # it has been created before calling any of its methods
274            if self.top is not None:
275                if self.session.HasMaps():
276                    self.top.SetMap(self.session.Maps()[0])
277                else:
278                    self.top.SetMap(None)
279    
280        in_exception_dialog = 0 # flag: are we already inside the exception dialog?
281    
282        def ShowExceptionDialog(self, exc_type, exc_value, exc_traceback):
283            """Show a message box with information about an exception.
284        
285            The parameters are the usual values describing an exception in
286            Python, the exception type, the value and the traceback.
287        
288            This method can be used as a value for the sys.excepthook.
289            """
290    
291            if self.in_exception_dialog:
292                return
293            self.in_exception_dialog = 1
294            while wxIsBusy():
295                wxEndBusyCursor() # reset the mouse cursor
296    
297            try:
298                lines = traceback.format_exception(exc_type, exc_value,
299                                                exc_traceback)
300                message = _("An unhandled exception occurred:\n%s\n"
301                            "(please report to"
302                            " http://thuban.intevation.org/bugtracker.html)"
303                            "\n\n%s") % (exc_value, "".join(lines))
304                print message
305    
306                # We don't use an explicit parent here because this method might
307                # be called in circumstances where the main window doesn't exist
308                # anymore.
309                exceptiondialog.run_exception_dialog(None, message)
310    
311            finally:
312                self.in_exception_dialog = 0
313                # delete the last exception info that python keeps in
314                # sys.last_* because especially last_traceback keeps
315                # indirect references to all objects bound to local
316                # variables and this might prevent some object from being
317                # collected early enough.
318                sys.last_type = sys.last_value = sys.last_traceback = None
319    
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