/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/application.py
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revision 251 by bh, Tue Jul 30 14:18:40 2002 UTC revision 2072 by bh, Tue Feb 17 13:14:49 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            self.SetTopWindow(self.top)
75            if self.splash is None:
76                self.ShowMainWindow()
77    
78            return True
79    
80      def OnExit(self):      def OnExit(self):
81          """Clean up code.          """Clean up code.
# Line 60  class ThubanApplication(wxApp, Publisher Line 83  class ThubanApplication(wxApp, Publisher
83          Extend this in derived classes if needed.          Extend this in derived classes if needed.
84          """          """
85          self.session.Destroy()          self.session.Destroy()
86          self.interactor.Destroy()          self.session = None
87          Publisher.Destroy(self)          Publisher.Destroy(self)
88    
     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()  
   
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 86  class ThubanApplication(wxApp, Publisher Line 100  class ThubanApplication(wxApp, Publisher
100                      if tb.tb_next is not None:                      if tb.tb_next is not None:
101                          # The ImportError exception was raised from                          # The ImportError exception was raised from
102                          # inside the thubanstart module.                          # inside the thubanstart module.
103                          sys.stderr.write("Cannot import the thubanstart"                          sys.stderr.write(_("Cannot import the thubanstart"
104                                           "module\n")                                           " module\n"))
105                          traceback.print_exc(None, sys.stderr)                          traceback.print_exc(None, sys.stderr)
106                      else:                      else:
107                          # There's no thubanstart module.                          # There's no thubanstart module.
108                          sys.stderr.write("No thubanstart module available\n")                          sys.stderr.write(_("No thubanstart module available\n"))
109                  finally:                  finally:
110                      # make sure we delete the traceback object,                      # make sure we delete the traceback object,
111                      # otherwise there's be circular references involving                      # otherwise there's be circular references involving
112                      # the current stack frame                      # the current stack frame
113                      del tb                      del tb
114              except:              except:
115                  sys.stderr.write("Cannot import the thubanstart module\n")                  sys.stderr.write(_("Cannot import the thubanstart module\n"))
116                  traceback.print_exc(None, sys.stderr)                  traceback.print_exc(None, sys.stderr)
117          else:          else:
118              # There's no .thuban directory              # There's no .thuban directory
119              sys.stderr.write("No ~/.thuban directory\n")              sys.stderr.write(_("No ~/.thuban directory\n"))
120    
121        def splash_screen(self):
122            """Create and return a splash screen.
123    
124            This method is called by OnInit to determine whether the
125            application should have a splashscreen. If the application
126            should display a splash screen override this method in a derived
127            class and have it create and return the wxSplashScreen instance.
128            The implementation of this method in the derived class should
129            also arranged for ShowMainWindow to be called.
130    
131            The default implementation simply returns None so that no splash
132            screen is shown and ShowMainWindow will be called automatically.
133            """
134            return None
135    
136        def ShowMainWindow(self):
137            """Show the main window
138    
139            Normally this method is automatically called by OnInit to show
140            the main window. However, if the splash_screen method has
141            returned a splashscreen it is expected that the derived class
142            also arranges for ShowMainWindow to be called at the appropriate
143            time.
144            """
145            self.top.Show(True)
146    
147      def CreateMainWindow(self):      def CreateMainWindow(self):
148          """Create and return the main window for the application.          """Create and return the main window for the application.
# Line 110  class ThubanApplication(wxApp, Publisher Line 150  class ThubanApplication(wxApp, Publisher
150          Override this in subclasses to instantiate the Thuban mainwindow          Override this in subclasses to instantiate the Thuban mainwindow
151          with different parameters or to use a different class for the          with different parameters or to use a different class for the
152          main window.          main window.
153            """
154          when this method is called by OnInit self.interactor (to be used          msg = (_("This is the wxPython-based Graphical User Interface"
155          for the interactor argument of the standard Thuban main window                 " for exploring geographic data"))
156          class) has already been instantiated.          return mainwindow.MainWindow(NULL, -1, "Thuban", self, None,
157          """                                       initial_message = msg,
158          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)  
159    
160      def Session(self):      def Session(self):
161          """Return the application's session object"""          """Return the application's session object"""
# Line 127  class ThubanApplication(wxApp, Publisher Line 164  class ThubanApplication(wxApp, Publisher
164      def SetSession(self, session):      def SetSession(self, session):
165          """Make session the new session.          """Make session the new session.
166    
167          Issue SESSION_CHANGED after self.session has become the new          Issue SESSION_REPLACED after self.session has become the new
168          session. After the session has been assigned call          session. After the session has been assigned call
169          self.subscribe_session() with the new session and          self.subscribe_session() with the new session and
170          self.unsubscribe_session with the old one.          self.unsubscribe_session with the old one.
# Line 135  class ThubanApplication(wxApp, Publisher Line 172  class ThubanApplication(wxApp, Publisher
172          oldsession = self.session          oldsession = self.session
173          self.session = session          self.session = session
174          self.subscribe_session(self.session)          self.subscribe_session(self.session)
175          self.issue(SESSION_CHANGED)          self.issue(SESSION_REPLACED)
         self.interactor.SetSession(session)  
176          self.maps_changed()          self.maps_changed()
177          if oldsession is not None:          if oldsession is not None:
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 168  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          session = load_session(filename)          """Open the session in the file named filename"""
219            # Make sure we deal with an absolute pathname. Otherwise we can
220            # get problems when saving because the saving code expects an
221            # absolute directory name
222            filename = os.path.abspath(filename)
223            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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