/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/application.py
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revision 39 by bh, Thu Sep 6 17:18:22 2001 UTC revision 2051 by frank, Wed Jan 21 17:09:15 2004 UTC
# Line 1  Line 1 
1  # Copyright (C) 2001 by Intevation GmbH  # Copyright (C) 2001, 2002, 2003 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)          self.splash = self.splash_screen()
55          top.Show(true)          if self.splash is not None:
56          self.top = top              self.splash.Show()
57          self.SetTopWindow(top)          self.read_startup_files()
58            self.top = self.CreateMainWindow()
59            self.SetTopWindow(self.top)
60            if self.splash is None:
61                self.ShowMainWindow()
62          self.session = None          self.session = None
63          self.create_session()          self.create_session()
64          return true          self.path={"data":".", "projection":"."}
65            return True
66    
67        def OnExit(self):
68            """Clean up code.
69    
70            Extend this in derived classes if needed.
71            """
72            self.session.Destroy()
73            self.session = None
74            Publisher.Destroy(self)
75    
76        def read_startup_files(self):
77            """Read the startup files."""
78            # for now the startup file is ~/.thuban/thubanstart.py
79            dir = get_application_dir()
80            if os.path.isdir(dir):
81                sys.path.append(dir)
82                try:
83                    import thubanstart
84                except ImportError:
85                    tb = sys.exc_info()[2]
86                    try:
87                        if tb.tb_next is not None:
88                            # The ImportError exception was raised from
89                            # inside the thubanstart module.
90                            sys.stderr.write(_("Cannot import the thubanstart"
91                                             " module\n"))
92                            traceback.print_exc(None, sys.stderr)
93                        else:
94                            # There's no thubanstart module.
95                            sys.stderr.write(_("No thubanstart module available\n"))
96                    finally:
97                        # make sure we delete the traceback object,
98                        # otherwise there's be circular references involving
99                        # the current stack frame
100                        del tb
101                except:
102                    sys.stderr.write(_("Cannot import the thubanstart module\n"))
103                    traceback.print_exc(None, sys.stderr)
104            else:
105                # There's no .thuban directory
106                sys.stderr.write(_("No ~/.thuban directory\n"))
107    
108        def splash_screen(self):
109            """Create and return a splash screen.
110    
111            This method is called by OnInit to determine whether the
112            application should have a splashscreen. If the application
113            should display a splash screen override this method in a derived
114            class and have it create and return the wxSplashScreen instance.
115            The implementation of this method in the derived class should
116            also arranged for ShowMainWindow to be called.
117    
118            The default implementation simply returns None so that no splash
119            screen is shown and ShowMainWindow will be called automatically.
120            """
121            return None
122    
123        def ShowMainWindow(self):
124            """Show the main window
125    
126            Normally this method is automatically called by OnInit to show
127            the main window. However, if the splash_screen method has
128            returned a splashscreen it is expected that the derived class
129            also arranges for ShowMainWindow to be called at the appropriate
130            time.
131            """
132            self.top.Show(True)
133    
134        def CreateMainWindow(self):
135            """Create and return the main window for the application.
136    
137            Override this in subclasses to instantiate the Thuban mainwindow
138            with different parameters or to use a different class for the
139            main window.
140            """
141            msg = (_("This is the wxPython-based Graphical User Interface"
142                   " for exploring geographic data"))
143            return mainwindow.MainWindow(NULL, -1, "Thuban", self, None,
144                                         initial_message = msg,
145                                         size = (600, 400))
146    
147        def Session(self):
148            """Return the application's session object"""
149            return self.session
150    
151      def SetSession(self, session):      def SetSession(self, session):
152            """Make session the new session.
153    
154            Issue SESSION_REPLACED after self.session has become the new
155            session. After the session has been assigned call
156            self.subscribe_session() with the new session and
157            self.unsubscribe_session with the old one.
158            """
159          oldsession = self.session          oldsession = self.session
160          self.session = session          self.session = session
161          self.issue(SESSION_CHANGED)          self.subscribe_session(self.session)
162          self.interactor.SetSession(session)          self.issue(SESSION_REPLACED)
163          self.set_map()          self.maps_changed()
164          if oldsession is not None:          if oldsession is not None:
165                self.unsubscribe_session(oldsession)
166              oldsession.Destroy()              oldsession.Destroy()
167    
168        def SetPath(self, group, filename):
169            """Store the application's default path for file dialogs extracted
170            from a given filename.
171            """
172            self.path[group] = os.path.dirname( filename )
173    
174        def Path(self, group):
175            """Return the application's default path for file dialogs."""
176            return self.path[group]
177    
178        def subscribe_session(self, session):
179            """Subscribe to some of the sessions channels.
180    
181            Extend this method in derived classes if you need additional
182            channels.
183            """
184            session.Subscribe(MAPS_CHANGED, self.maps_changed)
185    
186        def unsubscribe_session(self, session):
187            """Unsubscribe from the sessions channels.
188    
189            Extend this method in derived classes if you subscribed to
190            additional channels in subscribe_session().
191            """
192            session.Unsubscribe(MAPS_CHANGED, self.maps_changed)
193    
194      def create_session(self):      def create_session(self):
195          # Create a simple default session          """Create a default session.
196    
197            Override this method in derived classes to instantiate the
198            session differently or to use a different session class. Don't
199            subscribe to channels here yet. Do that in the
200            subscribe_session() method.
201            """
202          self.SetSession(create_empty_session())          self.SetSession(create_empty_session())
203    
204      def OpenSession(self, filename):      def OpenSession(self, filename, db_connection_callback = None):
205          session = load_session(filename)          """Open the session in the file named filename"""
206            # Make sure we deal with an absolute pathname. Otherwise we can
207            # get problems when saving because the saving code expects an
208            # absolute directory name
209            filename = os.path.abspath(filename)
210            if db_connection_callback is None:
211                db_connection_callback = self.run_db_param_dialog
212            try:
213                session = load_session(filename,
214                                   db_connection_callback=db_connection_callback)
215            except LoadCancelled:
216                return
217          session.SetFilename(filename)          session.SetFilename(filename)
218          session.UnsetModified()          session.UnsetModified()
219          self.SetSession(session)          self.SetSession(session)
220    
221            for map in session.Maps():
222                for layer in map.Layers():
223                    if isinstance(layer, RasterLayer) \
224                        and not Thuban.Model.resource.has_gdal_support():
225                        msg = _("The current session contains Image layers,\n"
226                                "but the GDAL library is not available to "
227                                "draw them.")
228                        dlg = wx.wxMessageDialog(None,
229                                                 msg,
230                                                 _("Library not available"),
231                                                 wx.wxOK | wx.wxICON_INFORMATION)
232                        print msg
233                        dlg.ShowModal()
234                        dlg.Destroy()
235                        break
236    
237        def run_db_param_dialog(self, parameters, message):
238            """Implementation of the db_connection_callback for loading sessions"""
239            dlg = dbdialog.DBDialog(None, _("DB Connection Parameters"),
240                                    parameters, message)
241            return dlg.RunDialog()
242    
243    
244      def SaveSession(self):      def SaveSession(self):
245          save_session(self.session, self.session.filename)          save_session(self.session, self.session.filename)
246    
247      def set_map(self):      def maps_changed(self, *args):
248            """Subscribed to the session's MAPS_CHANGED messages.
249    
250            Set the toplevel window's map to the map in the session. This is
251            done by calling the window's SetMap method with the map as
252            argument. If the session doesn't have any maps None is used
253            instead.
254    
255            Currently Thuban can only really handle at most one map in a
256            sessions so the first map in the session's list of maps as
257            returned by the Maps method is used.
258            """
259          if self.session.HasMaps():          if self.session.HasMaps():
260              self.top.SetMap(self.session.Maps()[0])              self.top.SetMap(self.session.Maps()[0])
261          else:          else:
262              self.top.SetMap(None)              self.top.SetMap(None)
263    
264        in_exception_dialog = 0 # flag: are we already inside the exception dialog?
265    
266        def ShowExceptionDialog(self, exc_type, exc_value, exc_traceback):
267            """Show a message box with information about an exception.
268        
269            The parameters are the usual values describing an exception in
270            Python, the exception type, the value and the traceback.
271        
272            This method can be used as a value for the sys.excepthook.
273            """
274    
275            if self.in_exception_dialog:
276                return
277            self.in_exception_dialog = 1
278            while wxIsBusy():
279                wxEndBusyCursor() # reset the mouse cursor
280    
281            try:
282                lines = traceback.format_exception(exc_type, exc_value,
283                                                exc_traceback)
284                message = _("An unhandled exception occurred:\n%s\n"
285                            "(please report to"
286                            " http://thuban.intevation.org/bugtracker.html)"
287                            "\n\n%s") % (exc_value, "".join(lines))
288                print message
289    
290                # We don't use an explicit parent here because this method might
291                # be called in circumstances where the main window doesn't exist
292                # anymore.
293                exceptiondialog.run_exception_dialog(None, message)
294    
295            finally:
296                self.in_exception_dialog = 0
297                # delete the last exception info that python keeps in
298                # sys.last_* because especially last_traceback keeps
299                # indirect references to all objects bound to local
300                # variables and this might prevent some object from being
301                # collected early enough.
302                sys.last_type = sys.last_value = sys.last_traceback = None
303    
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