/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/application.py
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revision 6 by bh, Tue Aug 28 15:41:52 2001 UTC revision 2076 by bh, Thu Feb 19 15:19:39 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          # ugly hack to set the global app object before window-classes          sys.excepthook = self.ShowExceptionDialog
54          # are instantiated  
55          import main          # Initialize instance variables before trying to create any
56          main.app = self          # windows.  Creating windows can start an event loop if
57          self.interactor = Interactor(None)          # e.g. message boxes are popped up for some reason, and event
58          top = MainWindow(NULL, -1)          # handlers, especially EVT_UPDATE_UI may want to access things
59          top.Show(true)          # from the application.
60          self.top = top  
61          self.SetTopWindow(top)          # 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            # 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):
93            """Read the startup files."""
94            # for now the startup file is ~/.thuban/thubanstart.py
95            dir = get_application_dir()
96            if os.path.isdir(dir):
97                sys.path.append(dir)
98                try:
99                    import thubanstart
100                except ImportError:
101                    tb = sys.exc_info()[2]
102                    try:
103                        if tb.tb_next is not None:
104                            # The ImportError exception was raised from
105                            # inside the thubanstart module.
106                            sys.stderr.write(_("Cannot import the thubanstart"
107                                             " module\n"))
108                            traceback.print_exc(None, sys.stderr)
109                        else:
110                            # There's no thubanstart module.
111                            sys.stderr.write(_("No thubanstart module available\n"))
112                    finally:
113                        # make sure we delete the traceback object,
114                        # otherwise there's be circular references involving
115                        # the current stack frame
116                        del tb
117                except:
118                    sys.stderr.write(_("Cannot import the thubanstart module\n"))
119                    traceback.print_exc(None, sys.stderr)
120            else:
121                # There's no .thuban directory
122                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):
151            """Create and return the main window for the application.
152    
153            Override this in subclasses to instantiate the Thuban mainwindow
154            with different parameters or to use a different class for the
155            main window.
156            """
157            msg = (_("This is the wxPython-based Graphical User Interface"
158                   " for exploring geographic data"))
159            return mainwindow.MainWindow(NULL, -1, "Thuban", self, None,
160                                         initial_message = msg,
161                                         size = (600, 400))
162    
163        def Session(self):
164            """Return the application's session object"""
165            return self.session
166    
167      def SetSession(self, session):      def SetSession(self, session):
168            """Make session the new session.
169    
170            Issue SESSION_REPLACED after self.session has become the new
171            session. After the session has been assigned call
172            self.subscribe_session() with the new session and
173            self.unsubscribe_session with the old one.
174            """
175          oldsession = self.session          oldsession = self.session
176          self.session = session          self.session = session
177          self.issue(SESSION_CHANGED)          self.subscribe_session(self.session)
178          self.interactor.SetSession(session)          self.issue(SESSION_REPLACED)
179          self.set_map()          self.maps_changed()
180          if oldsession is not None:          if oldsession is not None:
181                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):
195            """Subscribe to some of the sessions channels.
196    
197            Extend this method in derived classes if you need additional
198            channels.
199            """
200            session.Subscribe(MAPS_CHANGED, self.maps_changed)
201    
202        def unsubscribe_session(self, session):
203            """Unsubscribe from the sessions channels.
204    
205            Extend this method in derived classes if you subscribed to
206            additional channels in subscribe_session().
207            """
208            session.Unsubscribe(MAPS_CHANGED, self.maps_changed)
209    
210      def create_session(self):      def create_session(self):
211          # Create a simple default session          """Create a default session.
212    
213            Override this method in derived classes to instantiate the
214            session differently or to use a different session class. Don't
215            subscribe to channels here yet. Do that in the
216            subscribe_session() method.
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 set_map(self):      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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