/[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 1648 by bh, Mon Aug 25 13:55:35 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
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
 from interactor import Interactor  
36  import mainwindow  import mainwindow
37    
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 41  class ThubanApplication(wxApp, Publisher Line 45  class ThubanApplication(wxApp, Publisher
45    
46      All wxWindows programs have to have an instance of an application      All wxWindows programs have to have an instance of an application
47      class derived from wxApp. In Thuban the application class holds      class derived from wxApp. In Thuban the application class holds
48      references to the main window, the session and the interactor.      references to the main window and the session.
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()
56          self.read_startup_files()          self.read_startup_files()
         self.interactor = Interactor(None)  
57          self.top = self.CreateMainWindow()          self.top = self.CreateMainWindow()
58          self.SetTopWindow(self.top)          self.SetTopWindow(self.top)
59          if self.splash is None:          if self.splash is None:
60              self.ShowMainWindow()              self.ShowMainWindow()
61          self.session = None          self.session = None
62          self.create_session()          self.create_session()
63          return true          return True
64    
65      def OnExit(self):      def OnExit(self):
66          """Clean up code.          """Clean up code.
# Line 64  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.interactor.Destroy()          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 91  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 132  class ThubanApplication(wxApp, Publisher Line 127  class ThubanApplication(wxApp, Publisher
127          also arranges for ShowMainWindow to be called at the appropriate          also arranges for ShowMainWindow to be called at the appropriate
128          time.          time.
129          """          """
130          self.top.Show(true)          self.top.Show(True)
131          
132      def CreateMainWindow(self):      def CreateMainWindow(self):
133          """Create and return the main window for the application.          """Create and return the main window for the application.
134    
135          Override this in subclasses to instantiate the Thuban mainwindow          Override this in subclasses to instantiate the Thuban mainwindow
136          with different parameters or to use a different class for the          with different parameters or to use a different class for the
137          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.  
138          """          """
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, self.interactor,          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 166  class ThubanApplication(wxApp, Publisher Line 158  class ThubanApplication(wxApp, Publisher
158          self.session = session          self.session = session
159          self.subscribe_session(self.session)          self.subscribe_session(self.session)
160          self.issue(SESSION_REPLACED)          self.issue(SESSION_REPLACED)
         self.interactor.SetSession(session)  
161          self.maps_changed()          self.maps_changed()
162          if oldsession is not None:          if oldsession is not None:
163              self.unsubscribe_session(oldsession)              self.unsubscribe_session(oldsession)
# Line 198  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            session = load_session(filename,
199                                   db_connection_callback = db_connection_callback)
200          session.SetFilename(filename)          session.SetFilename(filename)
201          session.UnsetModified()          session.UnsetModified()
202          self.SetSession(session)          self.SetSession(session)
203    
204            for map in session.Maps():
205                for layer in map.Layers():
206                    if isinstance(layer, RasterLayer) \
207                        and not Thuban.Model.resource.has_gdal_support():
208                        msg = _("The current session contains Image layers,\n"
209                                "but the GDAL library is not available to "
210                                "draw them.")
211                        dlg = wx.wxMessageDialog(None,
212                                                 msg,
213                                                 _("Library not available"),
214                                                 wx.wxOK | wx.wxICON_INFORMATION)
215                        print msg
216                        dlg.ShowModal()
217                        dlg.Destroy()
218                        break
219    
220      def SaveSession(self):      def SaveSession(self):
221          save_session(self.session, self.session.filename)          save_session(self.session, self.session.filename)
222    
# Line 212  class ThubanApplication(wxApp, Publisher Line 225  class ThubanApplication(wxApp, Publisher
225              self.top.SetMap(self.session.Maps()[0])              self.top.SetMap(self.session.Maps()[0])
226          else:          else:
227              self.top.SetMap(None)              self.top.SetMap(None)
228    
229        in_exception_dialog = 0 # flag: are we already inside the exception dialog?
230    
231        def ShowExceptionDialog(self, exc_type, exc_value, exc_traceback):
232            """Show a message box with information about an exception.
233        
234            The parameters are the usual values describing an exception in
235            Python, the exception type, the value and the traceback.
236        
237            This method can be used as a value for the sys.excepthook.
238            """
239    
240            if self.in_exception_dialog:
241                return
242            self.in_exception_dialog = 1
243            while wxIsBusy():
244                wxEndBusyCursor() # reset the mouse cursor
245    
246            try:
247                lines = traceback.format_exception(exc_type, exc_value,
248                                                exc_traceback)
249                message = "An unhandled exception occurred:\n%s\n" % exc_value+\
250                        "(please report to " \
251                        "http://thuban.intevation.org/bugtracker.html)"\
252                        "\n\n\n"+\
253                        "".join(lines)
254                print message
255    
256                # We don't use an explicit parent here because this method might
257                # be called in circumstances where the main window doesn't exist
258                # anymore.
259                dlg = wxScrolledMessageDialog(None, message,
260                                            "Thuban: Internal Error")
261                dlg.ShowModal()
262                dlg.Destroy()
263    
264            finally:
265                self.in_exception_dialog = 0
266                # delete the last exception info that python keeps in
267                # sys.last_* because especially last_traceback keeps
268                # indirect references to all objects bound to local
269                # variables and this might prevent some object from being
270                # collected early enough.
271                sys.last_type = sys.last_value = sys.last_traceback = None
272    
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