/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/application.py
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revision 25 by bh, Wed Sep 5 13:36:13 2001 UTC revision 1650 by bh, Mon Aug 25 15:05:49 2003 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    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, LoadCancelled
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
36  from interactor import Interactor  import mainwindow
 from mainwindow import MainWindow  
   
 from messages import SESSION_CHANGED  
37    
38    from messages import SESSION_REPLACED
39    
40    
41  class ThubanApplication(wxApp, Publisher):  class ThubanApplication(wxApp, Publisher):
# Line 35  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          self.interactor = Interactor(None)          sys.excepthook = self.ShowExceptionDialog
53          top = MainWindow(NULL, -1, self.interactor)          self.splash = self.splash_screen()
54          top.Show(true)          if self.splash is not None:
55          self.top = top              self.splash.Show()
56          self.SetTopWindow(top)          self.read_startup_files()
57            self.top = self.CreateMainWindow()
58            self.SetTopWindow(self.top)
59            if self.splash is None:
60                self.ShowMainWindow()
61          self.session = None          self.session = None
62          self.create_session()          self.create_session()
63            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):
75            """Read the startup files."""
76            # for now the startup file is ~/.thuban/thubanstart.py
77            dir = get_application_dir()
78            if os.path.isdir(dir):
79                sys.path.append(dir)
80                try:
81                    import thubanstart
82                except ImportError:
83                    tb = sys.exc_info()[2]
84                    try:
85                        if tb.tb_next is not None:
86                            # The ImportError exception was raised from
87                            # inside the thubanstart module.
88                            sys.stderr.write(_("Cannot import the thubanstart"
89                                             " module\n"))
90                            traceback.print_exc(None, sys.stderr)
91                        else:
92                            # There's no thubanstart module.
93                            sys.stderr.write(_("No thubanstart module available\n"))
94                    finally:
95                        # make sure we delete the traceback object,
96                        # otherwise there's be circular references involving
97                        # the current stack frame
98                        del tb
99                except:
100                    sys.stderr.write(_("Cannot import the thubanstart module\n"))
101                    traceback.print_exc(None, sys.stderr)
102            else:
103                # There's no .thuban directory
104                sys.stderr.write(_("No ~/.thuban directory\n"))
105    
106        def splash_screen(self):
107            """Create and return a splash screen.
108    
109          f = wxFrame(top, -1, 'test', wxDefaultPosition, wxSize(300, 300))          This method is called by OnInit to determine whether the
110          self.tree = tree.myTreeCtrlPanel(f, self)          application should have a splashscreen. If the application
111          f.Show(true)          should display a splash screen override this method in a derived
112          return true          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):
133            """Create and return the main window for the application.
134    
135            Override this in subclasses to instantiate the Thuban mainwindow
136            with different parameters or to use a different class for the
137            main window.
138            """
139            msg = (_("This is the wxPython-based Graphical User Interface"
140                   " for exploring geographic data"))
141            return mainwindow.MainWindow(NULL, -1, "Thuban", self, None,
142                                         initial_message = msg,
143                                         size = (600, 400))
144    
145        def Session(self):
146            """Return the application's session object"""
147            return self.session
148    
149      def SetSession(self, session):      def SetSession(self, session):
150            """Make session the new session.
151    
152            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            try:
199                session = load_session(filename,
200                                   db_connection_callback=db_connection_callback)
201            except LoadCancelled:
202                return
203          session.SetFilename(filename)          session.SetFilename(filename)
204          session.UnsetModified()          session.UnsetModified()
205          self.SetSession(session)          self.SetSession(session)
206    
207            for map in session.Maps():
208                for layer in map.Layers():
209                    if isinstance(layer, RasterLayer) \
210                        and not Thuban.Model.resource.has_gdal_support():
211                        msg = _("The current session contains Image layers,\n"
212                                "but the GDAL library is not available to "
213                                "draw them.")
214                        dlg = wx.wxMessageDialog(None,
215                                                 msg,
216                                                 _("Library not available"),
217                                                 wx.wxOK | wx.wxICON_INFORMATION)
218                        print msg
219                        dlg.ShowModal()
220                        dlg.Destroy()
221                        break
222    
223      def SaveSession(self):      def SaveSession(self):
224          save_session(self.session, self.session.filename)          save_session(self.session, self.session.filename)
225    
226      def set_map(self):      def maps_changed(self, *args):
227          if self.session.HasMaps():          if self.session.HasMaps():
228              self.top.SetMap(self.session.Maps()[0])              self.top.SetMap(self.session.Maps()[0])
229          else:          else:
230              self.top.SetMap(None)              self.top.SetMap(None)
231    
232        in_exception_dialog = 0 # flag: are we already inside the exception dialog?
233    
234        def ShowExceptionDialog(self, exc_type, exc_value, exc_traceback):
235            """Show a message box with information about an exception.
236        
237            The parameters are the usual values describing an exception in
238            Python, the exception type, the value and the traceback.
239        
240            This method can be used as a value for the sys.excepthook.
241            """
242    
243            if self.in_exception_dialog:
244                return
245            self.in_exception_dialog = 1
246            while wxIsBusy():
247                wxEndBusyCursor() # reset the mouse cursor
248    
249            try:
250                lines = traceback.format_exception(exc_type, exc_value,
251                                                exc_traceback)
252                message = "An unhandled exception occurred:\n%s\n" % exc_value+\
253                        "(please report to " \
254                        "http://thuban.intevation.org/bugtracker.html)"\
255                        "\n\n\n"+\
256                        "".join(lines)
257                print message
258    
259                # We don't use an explicit parent here because this method might
260                # be called in circumstances where the main window doesn't exist
261                # anymore.
262                dlg = wxScrolledMessageDialog(None, message,
263                                            "Thuban: Internal Error")
264                dlg.ShowModal()
265                dlg.Destroy()
266    
267            finally:
268                self.in_exception_dialog = 0
269                # delete the last exception info that python keeps in
270                # sys.last_* because especially last_traceback keeps
271                # indirect references to all objects bound to local
272                # variables and this might prevent some object from being
273                # collected early enough.
274                sys.last_type = sys.last_value = sys.last_traceback = None
275    
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