/[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 251 by bh, Tue Jul 30 14:18:40 2002 UTC
# Line 1  Line 1 
1  # Copyright (C) 2001 by Intevation GmbH  # Copyright (C) 2001, 2002 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 traceback
17    
18  from wxPython.wx import *  from wxPython.wx import *
19    
20  from Thuban.Lib.connector import Publisher  from Thuban.Lib.connector import Publisher
# Line 18  from Thuban.Lib.connector import Publish Line 22  from Thuban.Lib.connector import Publish
22  from Thuban.Model.session import create_empty_session  from Thuban.Model.session import create_empty_session
23  from Thuban.Model.save import save_session  from Thuban.Model.save import save_session
24  from Thuban.Model.load import load_session  from Thuban.Model.load import load_session
25    from Thuban.Model.messages import MAPS_CHANGED
26    
27  import view  import view
28  import tree  import tree
29  from interactor import Interactor  from interactor import Interactor
30  from mainwindow import MainWindow  import mainwindow
31    
32  from messages import SESSION_CHANGED  from messages import SESSION_CHANGED
33    
# Line 39  class ThubanApplication(wxApp, Publisher Line 44  class ThubanApplication(wxApp, Publisher
44      """      """
45    
46      def OnInit(self):      def OnInit(self):
47            self.read_startup_files()
48          self.interactor = Interactor(None)          self.interactor = Interactor(None)
49          top = MainWindow(NULL, -1, self.interactor)          top = self.CreateMainWindow()
50          top.Show(true)          top.Show(true)
51          self.top = top          self.top = top
52          self.SetTopWindow(top)          self.SetTopWindow(top)
# Line 48  class ThubanApplication(wxApp, Publisher Line 54  class ThubanApplication(wxApp, Publisher
54          self.create_session()          self.create_session()
55          return true          return true
56    
57        def OnExit(self):
58            """Clean up code.
59    
60            Extend this in derived classes if needed.
61            """
62            self.session.Destroy()
63            self.interactor.Destroy()
64            Publisher.Destroy(self)
65    
66        def MainLoop(self):
67            """Call the inherited MainLoop method and then call OnExit.
68    
69            In wxPython OnExit isn't called automatically, unfortunately, so
70            we do it here.
71            """
72            wxApp.MainLoop(self)
73            self.OnExit()
74    
75        def read_startup_files(self):
76            """Read the startup files."""
77            # for now the startup file is ~/.thuban/thubanstart.py
78            dir =os.path.expanduser("~/.thuban")
79            if os.path.isdir(dir):
80                sys.path.append(dir)
81                try:
82                    import thubanstart
83                except ImportError:
84                    tb = sys.exc_info()[2]
85                    try:
86                        if tb.tb_next is not None:
87                            # The ImportError exception was raised from
88                            # inside the thubanstart module.
89                            sys.stderr.write("Cannot import the thubanstart"
90                                             "module\n")
91                            traceback.print_exc(None, sys.stderr)
92                        else:
93                            # There's no thubanstart module.
94                            sys.stderr.write("No thubanstart module available\n")
95                    finally:
96                        # make sure we delete the traceback object,
97                        # otherwise there's be circular references involving
98                        # the current stack frame
99                        del tb
100                except:
101                    sys.stderr.write("Cannot import the thubanstart module\n")
102                    traceback.print_exc(None, sys.stderr)
103            else:
104                # There's no .thuban directory
105                sys.stderr.write("No ~/.thuban directory\n")
106    
107        def CreateMainWindow(self):
108            """Create and return the main window for the application.
109    
110            Override this in subclasses to instantiate the Thuban mainwindow
111            with different parameters or to use a different class for the
112            main window.
113    
114            when this method is called by OnInit self.interactor (to be used
115            for the interactor argument of the standard Thuban main window
116            class) has already been instantiated.
117            """
118            msg = ("This is the wxPython-based Graphical User Interface"
119                   " for exploring geographic data")
120            return mainwindow.MainWindow(NULL, -1, "Thuban", self, self.interactor,
121                                         initial_message = msg)
122    
123        def Session(self):
124            """Return the application's session object"""
125            return self.session
126    
127      def SetSession(self, session):      def SetSession(self, session):
128            """Make session the new session.
129    
130            Issue SESSION_CHANGED after self.session has become the new
131            session. After the session has been assigned call
132            self.subscribe_session() with the new session and
133            self.unsubscribe_session with the old one.
134            """
135          oldsession = self.session          oldsession = self.session
136          self.session = session          self.session = session
137            self.subscribe_session(self.session)
138          self.issue(SESSION_CHANGED)          self.issue(SESSION_CHANGED)
139          self.interactor.SetSession(session)          self.interactor.SetSession(session)
140          self.set_map()          self.maps_changed()
141          if oldsession is not None:          if oldsession is not None:
142                self.unsubscribe_session(oldsession)
143              oldsession.Destroy()              oldsession.Destroy()
144    
145        def subscribe_session(self, session):
146            """Subscribe to some of the sessions channels.
147    
148            Extend this method in derived classes if you need additional
149            channels.
150            """
151            session.Subscribe(MAPS_CHANGED, self.maps_changed)
152    
153        def unsubscribe_session(self, session):
154            """Unsubscribe from the sessions channels.
155    
156            Extend this method in derived classes if you subscribed to
157            additional channels in subscribe_session().
158            """
159            session.Unsubscribe(MAPS_CHANGED, self.maps_changed)
160    
161      def create_session(self):      def create_session(self):
162          # Create a simple default session          """Create a default session.
163    
164            Override this method in derived classes to instantiate the
165            session differently or to use a different session class. Don't
166            subscribe to channels here yet. Do that in the
167            subscribe_session() method.
168            """
169          self.SetSession(create_empty_session())          self.SetSession(create_empty_session())
170    
171      def OpenSession(self, filename):      def OpenSession(self, filename):
# Line 70  class ThubanApplication(wxApp, Publisher Line 177  class ThubanApplication(wxApp, Publisher
177      def SaveSession(self):      def SaveSession(self):
178          save_session(self.session, self.session.filename)          save_session(self.session, self.session.filename)
179    
180      def set_map(self):      def maps_changed(self, *args):
181          if self.session.HasMaps():          if self.session.HasMaps():
182              self.top.SetMap(self.session.Maps()[0])              self.top.SetMap(self.session.Maps()[0])
183          else:          else:
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