/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/application.py
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revision 235 by bh, Tue Jul 23 10:56:29 2002 UTC revision 1648 by bh, Mon Aug 25 13:55:35 2003 UTC
# Line 1  Line 1 
1  # Copyright (C) 2001, 2002 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]>  # 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    from wxPython.lib.dialogs import wxScrolledMessageDialog
22    
23  from Thuban.Lib.connector import Publisher  from Thuban.Lib.connector import Publisher
24    from Thuban.Lib.fileutil import get_application_dir
25    
26    from Thuban import _
27  from Thuban.Model.session import create_empty_session  from Thuban.Model.session import create_empty_session
28  from Thuban.Model.save import save_session  from Thuban.Model.save import save_session
29  from Thuban.Model.load import load_session  from Thuban.Model.load import load_session
30    from Thuban.Model.messages import MAPS_CHANGED
31    from Thuban.Model.layer import RasterLayer
32    import Thuban.Model.resource
33    
34  import view  import view
35  import tree  import tree
 from interactor import Interactor  
36  import mainwindow  import mainwindow
37    
38  from messages import SESSION_CHANGED  from messages import SESSION_REPLACED
   
39    
40    
41  class ThubanApplication(wxApp, Publisher):  class ThubanApplication(wxApp, Publisher):
# Line 39  class ThubanApplication(wxApp, Publisher Line 45  class ThubanApplication(wxApp, Publisher
45    
46      All wxWindows programs have to have an instance of an application      All wxWindows programs have to have an instance of an application
47      class derived from wxApp. In Thuban the application class holds      class derived from wxApp. In Thuban the application class holds
48      references to the main window, the session and the interactor.      references to the main window and the session.
49      """      """
50    
51      def OnInit(self):      def OnInit(self):
52            sys.excepthook = self.ShowExceptionDialog
53            self.splash = self.splash_screen()
54            if self.splash is not None:
55                self.splash.Show()
56          self.read_startup_files()          self.read_startup_files()
57          self.interactor = Interactor(None)          self.top = self.CreateMainWindow()
58          top = self.CreateMainWindow()          self.SetTopWindow(self.top)
59          top.Show(true)          if self.splash is None:
60          self.top = top              self.ShowMainWindow()
         self.SetTopWindow(top)  
61          self.session = None          self.session = None
62          self.create_session()          self.create_session()
63          return true          return True
64    
65        def OnExit(self):
66            """Clean up code.
67    
68            Extend this in derived classes if needed.
69            """
70            self.session.Destroy()
71            self.session = None
72            Publisher.Destroy(self)
73    
74      def read_startup_files(self):      def read_startup_files(self):
75          """Read the startup files."""          """Read the startup files."""
76          # for now the startup file is ~/.thuban/thubanstart.py          # for now the startup file is ~/.thuban/thubanstart.py
77          dir =os.path.expanduser("~/.thuban")          dir = get_application_dir()
78          if os.path.isdir(dir):          if os.path.isdir(dir):
79              sys.path.append(dir)              sys.path.append(dir)
80              try:              try:
# Line 67  class ThubanApplication(wxApp, Publisher Line 85  class ThubanApplication(wxApp, Publisher
85                      if tb.tb_next is not None:                      if tb.tb_next is not None:
86                          # The ImportError exception was raised from                          # The ImportError exception was raised from
87                          # inside the thubanstart module.                          # inside the thubanstart module.
88                          sys.stderr.write("Cannot import the thubanstart"                          sys.stderr.write(_("Cannot import the thubanstart"
89                                           "module\n")                                           " module\n"))
90                          traceback.print_exc(None, sys.stderr)                          traceback.print_exc(None, sys.stderr)
91                      else:                      else:
92                          # There's no thubanstart module.                          # There's no thubanstart module.
93                          sys.stderr.write("No thubanstart module available\n")                          sys.stderr.write(_("No thubanstart module available\n"))
94                  finally:                  finally:
95                      # make sure we delete the traceback object,                      # make sure we delete the traceback object,
96                      # otherwise there's be circular references involving                      # otherwise there's be circular references involving
97                      # the current stack frame                      # the current stack frame
98                      del tb                      del tb
99              except:              except:
100                  sys.stderr.write("Cannot import the thubanstart module\n")                  sys.stderr.write(_("Cannot import the thubanstart module\n"))
101                  traceback.print_exc(None, sys.stderr)                  traceback.print_exc(None, sys.stderr)
102          else:          else:
103              # There's no .thuban directory              # There's no .thuban directory
104              sys.stderr.write("No ~/.thuban directory\n")              sys.stderr.write(_("No ~/.thuban directory\n"))
105    
106        def splash_screen(self):
107            """Create and return a splash screen.
108    
109            This method is called by OnInit to determine whether the
110            application should have a splashscreen. If the application
111            should display a splash screen override this method in a derived
112            class and have it create and return the wxSplashScreen instance.
113            The implementation of this method in the derived class should
114            also arranged for ShowMainWindow to be called.
115    
116            The default implementation simply returns None so that no splash
117            screen is shown and ShowMainWindow will be called automatically.
118            """
119            return None
120    
121        def ShowMainWindow(self):
122            """Show the main window
123    
124            Normally this method is automatically called by OnInit to show
125            the main window. However, if the splash_screen method has
126            returned a splashscreen it is expected that the derived class
127            also arranges for ShowMainWindow to be called at the appropriate
128            time.
129            """
130            self.top.Show(True)
131    
132      def CreateMainWindow(self):      def CreateMainWindow(self):
133          """Create and return the main window for the application.          """Create and return the main window for the application.
# Line 91  class ThubanApplication(wxApp, Publisher Line 135  class ThubanApplication(wxApp, Publisher
135          Override this in subclasses to instantiate the Thuban mainwindow          Override this in subclasses to instantiate the Thuban mainwindow
136          with different parameters or to use a different class for the          with different parameters or to use a different class for the
137          main window.          main window.
138            """
139          when this method is called by OnInit self.interactor (to be used          msg = (_("This is the wxPython-based Graphical User Interface"
140          for the interactor argument of the standard Thuban main window                 " for exploring geographic data"))
141          class) has already been instantiated.          return mainwindow.MainWindow(NULL, -1, "Thuban", self, None,
142          """                                       initial_message = msg,
143          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)  
144    
145      def Session(self):      def Session(self):
146          """Return the application's session object"""          """Return the application's session object"""
# Line 108  class ThubanApplication(wxApp, Publisher Line 149  class ThubanApplication(wxApp, Publisher
149      def SetSession(self, session):      def SetSession(self, session):
150          """Make session the new session.          """Make session the new session.
151    
152          Issue SESSION_CHANGED.          Issue SESSION_REPLACED after self.session has become the new
153            session. After the session has been assigned call
154            self.subscribe_session() with the new session and
155            self.unsubscribe_session with the old one.
156          """          """
157          oldsession = self.session          oldsession = self.session
158          self.session = session          self.session = session
159          self.issue(SESSION_CHANGED)          self.subscribe_session(self.session)
160          self.interactor.SetSession(session)          self.issue(SESSION_REPLACED)
161          self.set_map()          self.maps_changed()
162          if oldsession is not None:          if oldsession is not None:
163                self.unsubscribe_session(oldsession)
164              oldsession.Destroy()              oldsession.Destroy()
165    
166        def subscribe_session(self, session):
167            """Subscribe to some of the sessions channels.
168    
169            Extend this method in derived classes if you need additional
170            channels.
171            """
172            session.Subscribe(MAPS_CHANGED, self.maps_changed)
173    
174        def unsubscribe_session(self, session):
175            """Unsubscribe from the sessions channels.
176    
177            Extend this method in derived classes if you subscribed to
178            additional channels in subscribe_session().
179            """
180            session.Unsubscribe(MAPS_CHANGED, self.maps_changed)
181    
182      def create_session(self):      def create_session(self):
183          # Create a simple default session          """Create a default session.
184    
185            Override this method in derived classes to instantiate the
186            session differently or to use a different session class. Don't
187            subscribe to channels here yet. Do that in the
188            subscribe_session() method.
189            """
190          self.SetSession(create_empty_session())          self.SetSession(create_empty_session())
191    
192      def OpenSession(self, filename):      def OpenSession(self, filename, db_connection_callback = None):
193          session = load_session(filename)          """Open the session in the file named filename"""
194            # Make sure we deal with an absolute pathname. Otherwise we can
195            # get problems when saving because the saving code expects an
196            # absolute directory name
197            filename = os.path.abspath(filename)
198            session = load_session(filename,
199                                   db_connection_callback = db_connection_callback)
200          session.SetFilename(filename)          session.SetFilename(filename)
201          session.UnsetModified()          session.UnsetModified()
202          self.SetSession(session)          self.SetSession(session)
203    
204            for map in session.Maps():
205                for layer in map.Layers():
206                    if isinstance(layer, RasterLayer) \
207                        and not Thuban.Model.resource.has_gdal_support():
208                        msg = _("The current session contains Image layers,\n"
209                                "but the GDAL library is not available to "
210                                "draw them.")
211                        dlg = wx.wxMessageDialog(None,
212                                                 msg,
213                                                 _("Library not available"),
214                                                 wx.wxOK | wx.wxICON_INFORMATION)
215                        print msg
216                        dlg.ShowModal()
217                        dlg.Destroy()
218                        break
219    
220      def SaveSession(self):      def SaveSession(self):
221          save_session(self.session, self.session.filename)          save_session(self.session, self.session.filename)
222    
223      def set_map(self):      def maps_changed(self, *args):
224          if self.session.HasMaps():          if self.session.HasMaps():
225              self.top.SetMap(self.session.Maps()[0])              self.top.SetMap(self.session.Maps()[0])
226          else:          else:
227              self.top.SetMap(None)              self.top.SetMap(None)
228    
229        in_exception_dialog = 0 # flag: are we already inside the exception dialog?
230    
231        def ShowExceptionDialog(self, exc_type, exc_value, exc_traceback):
232            """Show a message box with information about an exception.
233        
234            The parameters are the usual values describing an exception in
235            Python, the exception type, the value and the traceback.
236        
237            This method can be used as a value for the sys.excepthook.
238            """
239    
240            if self.in_exception_dialog:
241                return
242            self.in_exception_dialog = 1
243            while wxIsBusy():
244                wxEndBusyCursor() # reset the mouse cursor
245    
246            try:
247                lines = traceback.format_exception(exc_type, exc_value,
248                                                exc_traceback)
249                message = "An unhandled exception occurred:\n%s\n" % exc_value+\
250                        "(please report to " \
251                        "http://thuban.intevation.org/bugtracker.html)"\
252                        "\n\n\n"+\
253                        "".join(lines)
254                print message
255    
256                # We don't use an explicit parent here because this method might
257                # be called in circumstances where the main window doesn't exist
258                # anymore.
259                dlg = wxScrolledMessageDialog(None, message,
260                                            "Thuban: Internal Error")
261                dlg.ShowModal()
262                dlg.Destroy()
263    
264            finally:
265                self.in_exception_dialog = 0
266                # delete the last exception info that python keeps in
267                # sys.last_* because especially last_traceback keeps
268                # indirect references to all objects bound to local
269                # variables and this might prevent some object from being
270                # collected early enough.
271                sys.last_type = sys.last_value = sys.last_traceback = None
272    
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