/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/application.py
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revision 242 by bh, Wed Jul 24 17:16:31 2002 UTC revision 2076 by bh, Thu Feb 19 15:19:39 2004 UTC
# Line 1  Line 1 
1  # Copyright (C) 2001, 2002 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 _
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_CHANGED  from messages import SESSION_REPLACED
   
40    
41    
42  class ThubanApplication(wxApp, Publisher):  class ThubanApplication(wxApp, Publisher):
# Line 40  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          self.read_startup_files()          sys.excepthook = self.ShowExceptionDialog
54          self.interactor = Interactor(None)  
55          top = self.CreateMainWindow()          # Initialize instance variables before trying to create any
56          top.Show(true)          # windows.  Creating windows can start an event loop if
57          self.top = top          # e.g. message boxes are popped up for some reason, and event
58          self.SetTopWindow(top)          # 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          self.session = None
65            self.top = None
66          self.create_session()          self.create_session()
67          return true  
68            # Create an optional splash screen and then the mainwindow
69            self.splash = self.splash_screen()
70            if self.splash is not None:
71                self.splash.Show()
72            self.read_startup_files()
73            self.top = self.CreateMainWindow()
74            # The session was alredy created above and we need to get the
75            # map into the mainwindow.  maps_changed does that.
76            self.maps_changed()
77            self.SetTopWindow(self.top)
78            if self.splash is None:
79                self.ShowMainWindow()
80    
81            return True
82    
83        def OnExit(self):
84            """Clean up code.
85    
86            Extend this in derived classes if needed.
87            """
88            self.session.Destroy()
89            self.session = None
90            Publisher.Destroy(self)
91    
92      def read_startup_files(self):      def read_startup_files(self):
93          """Read the startup files."""          """Read the startup files."""
94          # for now the startup file is ~/.thuban/thubanstart.py          # for now the startup file is ~/.thuban/thubanstart.py
95          dir =os.path.expanduser("~/.thuban")          dir = get_application_dir()
96          if os.path.isdir(dir):          if os.path.isdir(dir):
97              sys.path.append(dir)              sys.path.append(dir)
98              try:              try:
# Line 68  class ThubanApplication(wxApp, Publisher Line 103  class ThubanApplication(wxApp, Publisher
103                      if tb.tb_next is not None:                      if tb.tb_next is not None:
104                          # The ImportError exception was raised from                          # The ImportError exception was raised from
105                          # inside the thubanstart module.                          # inside the thubanstart module.
106                          sys.stderr.write("Cannot import the thubanstart"                          sys.stderr.write(_("Cannot import the thubanstart"
107                                           "module\n")                                           " module\n"))
108                          traceback.print_exc(None, sys.stderr)                          traceback.print_exc(None, sys.stderr)
109                      else:                      else:
110                          # There's no thubanstart module.                          # There's no thubanstart module.
111                          sys.stderr.write("No thubanstart module available\n")                          sys.stderr.write(_("No thubanstart module available\n"))
112                  finally:                  finally:
113                      # make sure we delete the traceback object,                      # make sure we delete the traceback object,
114                      # otherwise there's be circular references involving                      # otherwise there's be circular references involving
115                      # the current stack frame                      # the current stack frame
116                      del tb                      del tb
117              except:              except:
118                  sys.stderr.write("Cannot import the thubanstart module\n")                  sys.stderr.write(_("Cannot import the thubanstart module\n"))
119                  traceback.print_exc(None, sys.stderr)                  traceback.print_exc(None, sys.stderr)
120          else:          else:
121              # There's no .thuban directory              # There's no .thuban directory
122              sys.stderr.write("No ~/.thuban directory\n")              sys.stderr.write(_("No ~/.thuban directory\n"))
123    
124        def splash_screen(self):
125            """Create and return a splash screen.
126    
127            This method is called by OnInit to determine whether the
128            application should have a splashscreen. If the application
129            should display a splash screen override this method in a derived
130            class and have it create and return the wxSplashScreen instance.
131            The implementation of this method in the derived class should
132            also arranged for ShowMainWindow to be called.
133    
134            The default implementation simply returns None so that no splash
135            screen is shown and ShowMainWindow will be called automatically.
136            """
137            return None
138    
139        def ShowMainWindow(self):
140            """Show the main window
141    
142            Normally this method is automatically called by OnInit to show
143            the main window. However, if the splash_screen method has
144            returned a splashscreen it is expected that the derived class
145            also arranges for ShowMainWindow to be called at the appropriate
146            time.
147            """
148            self.top.Show(True)
149    
150      def CreateMainWindow(self):      def CreateMainWindow(self):
151          """Create and return the main window for the application.          """Create and return the main window for the application.
# Line 92  class ThubanApplication(wxApp, Publisher Line 153  class ThubanApplication(wxApp, Publisher
153          Override this in subclasses to instantiate the Thuban mainwindow          Override this in subclasses to instantiate the Thuban mainwindow
154          with different parameters or to use a different class for the          with different parameters or to use a different class for the
155          main window.          main window.
156            """
157          when this method is called by OnInit self.interactor (to be used          msg = (_("This is the wxPython-based Graphical User Interface"
158          for the interactor argument of the standard Thuban main window                 " for exploring geographic data"))
159          class) has already been instantiated.          return mainwindow.MainWindow(NULL, -1, "Thuban", self, None,
160          """                                       initial_message = msg,
161          msg = ("This is the wxPython-based Graphical User Interface"                                       size = (600, 400))
                " for exploring geographic data")  
         return mainwindow.MainWindow(NULL, -1, "Thuban", self, self.interactor,  
                                      initial_message = msg)  
162    
163      def Session(self):      def Session(self):
164          """Return the application's session object"""          """Return the application's session object"""
# Line 109  class ThubanApplication(wxApp, Publisher Line 167  class ThubanApplication(wxApp, Publisher
167      def SetSession(self, session):      def SetSession(self, session):
168          """Make session the new session.          """Make session the new session.
169    
170          Issue SESSION_CHANGED after self.session has become the new          Issue SESSION_REPLACED after self.session has become the new
171          session. After the session has been assigned call          session. After the session has been assigned call
172          self.subscribe_session() with the new session and          self.subscribe_session() with the new session and
173          self.unsubscribe_session with the old one.          self.unsubscribe_session with the old one.
# Line 117  class ThubanApplication(wxApp, Publisher Line 175  class ThubanApplication(wxApp, Publisher
175          oldsession = self.session          oldsession = self.session
176          self.session = session          self.session = session
177          self.subscribe_session(self.session)          self.subscribe_session(self.session)
178          self.issue(SESSION_CHANGED)          self.issue(SESSION_REPLACED)
         self.interactor.SetSession(session)  
179          self.maps_changed()          self.maps_changed()
180          if oldsession is not None:          if oldsession is not None:
181              self.unsubscribe_session(oldsession)              self.unsubscribe_session(oldsession)
182              oldsession.Destroy()              oldsession.Destroy()
183    
184        def SetPath(self, group, filename):
185            """Store the application's default path for file dialogs extracted
186            from a given filename.
187            """
188            self.path[group] = os.path.dirname( filename )
189    
190        def Path(self, group):
191            """Return the application's default path for file dialogs."""
192            return self.path[group]
193    
194      def subscribe_session(self, session):      def subscribe_session(self, session):
195          """Subscribe to some of the sessions channels.          """Subscribe to some of the sessions channels.
196    
# Line 150  class ThubanApplication(wxApp, Publisher Line 217  class ThubanApplication(wxApp, Publisher
217          """          """
218          self.SetSession(create_empty_session())          self.SetSession(create_empty_session())
219    
220      def OpenSession(self, filename):      def OpenSession(self, filename, db_connection_callback = None):
221          session = load_session(filename)          """Open the session in the file named filename"""
222            # Make sure we deal with an absolute pathname. Otherwise we can
223            # get problems when saving because the saving code expects an
224            # absolute directory name
225            filename = os.path.abspath(filename)
226            if db_connection_callback is None:
227                db_connection_callback = self.run_db_param_dialog
228            try:
229                session = load_session(filename,
230                                   db_connection_callback=db_connection_callback)
231            except LoadCancelled:
232                return
233          session.SetFilename(filename)          session.SetFilename(filename)
234          session.UnsetModified()          session.UnsetModified()
235          self.SetSession(session)          self.SetSession(session)
236    
237            for map in session.Maps():
238                for layer in map.Layers():
239                    if isinstance(layer, RasterLayer) \
240                        and not Thuban.Model.resource.has_gdal_support():
241                        msg = _("The current session contains Image layers,\n"
242                                "but the GDAL library is not available to "
243                                "draw them.")
244                        dlg = wx.wxMessageDialog(None,
245                                                 msg,
246                                                 _("Library not available"),
247                                                 wx.wxOK | wx.wxICON_INFORMATION)
248                        print msg
249                        dlg.ShowModal()
250                        dlg.Destroy()
251                        break
252    
253        def run_db_param_dialog(self, parameters, message):
254            """Implementation of the db_connection_callback for loading sessions"""
255            dlg = dbdialog.DBDialog(None, _("DB Connection Parameters"),
256                                    parameters, message)
257            return dlg.RunDialog()
258    
259    
260      def SaveSession(self):      def SaveSession(self):
261          save_session(self.session, self.session.filename)          save_session(self.session, self.session.filename)
262    
263      def maps_changed(self, *args):      def maps_changed(self, *args):
264          if self.session.HasMaps():          """Subscribed to the session's MAPS_CHANGED messages.
265              self.top.SetMap(self.session.Maps()[0])  
266          else:          Set the toplevel window's map to the map in the session. This is
267              self.top.SetMap(None)          done by calling the window's SetMap method with the map as
268            argument. If the session doesn't have any maps None is used
269            instead.
270    
271            Currently Thuban can only really handle at most one map in a
272            sessions so the first map in the session's list of maps as
273            returned by the Maps method is used.
274            """
275            # The mainwindow may not have been created yet, so check whether
276            # it has been created before calling any of its methods
277            if self.top is not None:
278                if self.session.HasMaps():
279                    self.top.SetMap(self.session.Maps()[0])
280                else:
281                    self.top.SetMap(None)
282    
283        in_exception_dialog = 0 # flag: are we already inside the exception dialog?
284    
285        def ShowExceptionDialog(self, exc_type, exc_value, exc_traceback):
286            """Show a message box with information about an exception.
287        
288            The parameters are the usual values describing an exception in
289            Python, the exception type, the value and the traceback.
290        
291            This method can be used as a value for the sys.excepthook.
292            """
293    
294            if self.in_exception_dialog:
295                return
296            self.in_exception_dialog = 1
297            while wxIsBusy():
298                wxEndBusyCursor() # reset the mouse cursor
299    
300            try:
301                lines = traceback.format_exception(exc_type, exc_value,
302                                                exc_traceback)
303                message = _("An unhandled exception occurred:\n%s\n"
304                            "(please report to"
305                            " http://thuban.intevation.org/bugtracker.html)"
306                            "\n\n%s") % (exc_value, "".join(lines))
307                print message
308    
309                # We don't use an explicit parent here because this method might
310                # be called in circumstances where the main window doesn't exist
311                # anymore.
312                exceptiondialog.run_exception_dialog(None, message)
313    
314            finally:
315                self.in_exception_dialog = 0
316                # delete the last exception info that python keeps in
317                # sys.last_* because especially last_traceback keeps
318                # indirect references to all objects bound to local
319                # variables and this might prevent some object from being
320                # collected early enough.
321                sys.last_type = sys.last_value = sys.last_traceback = None
322    
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