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revision 25 by bh, Wed Sep 5 13:36:13 2001 UTC revision 2072 by bh, Tue Feb 17 13:14:49 2004 UTC
# Line 1  Line 1 
1  # Copyright (C) 2001 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]>
5  #  #
6  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
7  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
# Line 11  Thuban's application object. Line 12  Thuban's application object.
12    
13  __version__ = "$Revision$"  __version__ = "$Revision$"
14    
15    import sys, os
16    import os.path
17    
18    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
30    from Thuban.Model.layer import RasterLayer
31    import Thuban.Model.resource
32    
33  import view  import view
34  import tree  import tree
35  from interactor import Interactor  import mainwindow
36  from mainwindow import MainWindow  import dbdialog
37    import exceptiondialog
 from messages import SESSION_CHANGED  
38    
39    from messages import SESSION_REPLACED
40    
41    
42  class ThubanApplication(wxApp, Publisher):  class ThubanApplication(wxApp, Publisher):
# Line 35  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.interactor = Interactor(None)          sys.excepthook = self.ShowExceptionDialog
54          top = MainWindow(NULL, -1, self.interactor)  
55          top.Show(true)          # Initialize instance variables before trying to create any
56          self.top = top          # windows.  Creating windows can start an event loop if
57          self.SetTopWindow(top)          # 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          self.session = None
65            self.top = None
66          self.create_session()          self.create_session()
67    
68          f = wxFrame(top, -1, 'test', wxDefaultPosition, wxSize(300, 300))          # Create an optional splash screen and then the mainwindow
69          self.tree = tree.myTreeCtrlPanel(f, self)          self.splash = self.splash_screen()
70          f.Show(true)          if self.splash is not None:
71          return true              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):
81            """Clean up code.
82    
83            Extend this in derived classes if needed.
84            """
85            self.session.Destroy()
86            self.session = None
87            Publisher.Destroy(self)
88    
89        def read_startup_files(self):
90            """Read the startup files."""
91            # for now the startup file is ~/.thuban/thubanstart.py
92            dir = get_application_dir()
93            if os.path.isdir(dir):
94                sys.path.append(dir)
95                try:
96                    import thubanstart
97                except ImportError:
98                    tb = sys.exc_info()[2]
99                    try:
100                        if tb.tb_next is not None:
101                            # The ImportError exception was raised from
102                            # inside the thubanstart module.
103                            sys.stderr.write(_("Cannot import the thubanstart"
104                                             " module\n"))
105                            traceback.print_exc(None, sys.stderr)
106                        else:
107                            # There's no thubanstart module.
108                            sys.stderr.write(_("No thubanstart module available\n"))
109                    finally:
110                        # make sure we delete the traceback object,
111                        # otherwise there's be circular references involving
112                        # the current stack frame
113                        del tb
114                except:
115                    sys.stderr.write(_("Cannot import the thubanstart module\n"))
116                    traceback.print_exc(None, sys.stderr)
117            else:
118                # There's no .thuban directory
119                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):
148            """Create and return the main window for the application.
149    
150            Override this in subclasses to instantiate the Thuban mainwindow
151            with different parameters or to use a different class for the
152            main window.
153            """
154            msg = (_("This is the wxPython-based Graphical User Interface"
155                   " for exploring geographic data"))
156            return mainwindow.MainWindow(NULL, -1, "Thuban", self, None,
157                                         initial_message = msg,
158                                         size = (600, 400))
159    
160        def Session(self):
161            """Return the application's session object"""
162            return self.session
163    
164      def SetSession(self, session):      def SetSession(self, session):
165            """Make session the new session.
166    
167            Issue SESSION_REPLACED after self.session has become the new
168            session. After the session has been assigned call
169            self.subscribe_session() with the new session and
170            self.unsubscribe_session with the old one.
171            """
172          oldsession = self.session          oldsession = self.session
173          self.session = session          self.session = session
174          self.issue(SESSION_CHANGED)          self.subscribe_session(self.session)
175          self.interactor.SetSession(session)          self.issue(SESSION_REPLACED)
176          self.set_map()          self.maps_changed()
177          if oldsession is not None:          if oldsession is not None:
178                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):
192            """Subscribe to some of the sessions channels.
193    
194            Extend this method in derived classes if you need additional
195            channels.
196            """
197            session.Subscribe(MAPS_CHANGED, self.maps_changed)
198    
199        def unsubscribe_session(self, session):
200            """Unsubscribe from the sessions channels.
201    
202            Extend this method in derived classes if you subscribed to
203            additional channels in subscribe_session().
204            """
205            session.Unsubscribe(MAPS_CHANGED, self.maps_changed)
206    
207      def create_session(self):      def create_session(self):
208          # Create a simple default session          """Create a default session.
209    
210            Override this method in derived classes to instantiate the
211            session differently or to use a different session class. Don't
212            subscribe to channels here yet. Do that in the
213            subscribe_session() method.
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 set_map(self):      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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