/[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 671 by bh, Tue Apr 15 18:09:47 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 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
21    
22    from Thuban import _
23  from Thuban.Model.session import create_empty_session  from Thuban.Model.session import create_empty_session
24  from Thuban.Model.save import save_session  from Thuban.Model.save import save_session
25  from Thuban.Model.load import load_session  from Thuban.Model.load import load_session
26    from Thuban.Model.messages import MAPS_CHANGED
27    
28  import view  import view
29  import tree  import tree
30  from interactor import Interactor  import mainwindow
 from mainwindow import MainWindow  
31    
32  from messages import SESSION_CHANGED  from messages import SESSION_REPLACED
33    
34    
35    
# Line 35  class ThubanApplication(wxApp, Publisher Line 40  class ThubanApplication(wxApp, Publisher
40    
41      All wxWindows programs have to have an instance of an application      All wxWindows programs have to have an instance of an application
42      class derived from wxApp. In Thuban the application class holds      class derived from wxApp. In Thuban the application class holds
43      references to the main window, the session and the interactor.      references to the main window and the session.
44      """      """
45    
46      def OnInit(self):      def OnInit(self):
47          # ugly hack to set the global app object before window-classes          self.splash = self.splash_screen()
48          # are instantiated          if self.splash is not None:
49          import main              self.splash.Show()
50          main.app = self          self.read_startup_files()
51          self.interactor = Interactor(None)          self.top = self.CreateMainWindow()
52          top = MainWindow(NULL, -1)          self.SetTopWindow(self.top)
53          top.Show(true)          if self.splash is None:
54          self.top = top              self.ShowMainWindow()
         self.SetTopWindow(top)  
55          self.session = None          self.session = None
56          self.create_session()          self.create_session()
57            return True
58    
59        def OnExit(self):
60            """Clean up code.
61    
62            Extend this in derived classes if needed.
63            """
64            self.session.Destroy()
65            Publisher.Destroy(self)
66    
67        def MainLoop(self):
68            """Call the inherited MainLoop method and then call OnExit.
69    
70            In wxPython OnExit isn't called automatically, unfortunately, so
71            we do it here.
72            """
73            wxApp.MainLoop(self)
74            self.OnExit()
75    
76        def read_startup_files(self):
77            """Read the startup files."""
78            # for now the startup file is ~/.thuban/thubanstart.py
79            dir =os.path.expanduser("~/.thuban")
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          f = wxFrame(top, -1, 'test', wxDefaultPosition, wxSize(300, 300))          This method is called by OnInit to determine whether the
112          self.tree = tree.myTreeCtrlPanel(f, self)          application should have a splashscreen. If the application
113          f.Show(true)          should display a splash screen override this method in a derived
114          return true          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    
146        def Session(self):
147            """Return the application's session object"""
148            return self.session
149    
150      def SetSession(self, session):      def SetSession(self, session):
151            """Make session the new session.
152    
153            Issue SESSION_REPLACED after self.session has become the new
154            session. After the session has been assigned call
155            self.subscribe_session() with the new session and
156            self.unsubscribe_session with the old one.
157            """
158          oldsession = self.session          oldsession = self.session
159          self.session = session          self.session = session
160          self.issue(SESSION_CHANGED)          self.subscribe_session(self.session)
161          self.interactor.SetSession(session)          self.issue(SESSION_REPLACED)
162          self.set_map()          self.maps_changed()
163          if oldsession is not None:          if oldsession is not None:
164                self.unsubscribe_session(oldsession)
165              oldsession.Destroy()              oldsession.Destroy()
166    
167        def subscribe_session(self, session):
168            """Subscribe to some of the sessions channels.
169    
170            Extend this method in derived classes if you need additional
171            channels.
172            """
173            session.Subscribe(MAPS_CHANGED, self.maps_changed)
174    
175        def unsubscribe_session(self, session):
176            """Unsubscribe from the sessions channels.
177    
178            Extend this method in derived classes if you subscribed to
179            additional channels in subscribe_session().
180            """
181            session.Unsubscribe(MAPS_CHANGED, self.maps_changed)
182    
183      def create_session(self):      def create_session(self):
184          # Create a simple default session          """Create a default session.
185    
186            Override this method in derived classes to instantiate the
187            session differently or to use a different session class. Don't
188            subscribe to channels here yet. Do that in the
189            subscribe_session() method.
190            """
191          self.SetSession(create_empty_session())          self.SetSession(create_empty_session())
192    
193      def OpenSession(self, filename):      def OpenSession(self, filename):
194            """Open the session in the file named filename"""
195            # Make sure we deal with an absolute pathname. Otherwise we can
196            # get problems when saving because the saving code expects an
197            # absolute directory name
198            filename = os.path.abspath(filename)
199          session = load_session(filename)          session = load_session(filename)
200          session.SetFilename(filename)          session.SetFilename(filename)
201          session.UnsetModified()          session.UnsetModified()
# Line 78  class ThubanApplication(wxApp, Publisher Line 204  class ThubanApplication(wxApp, Publisher
204      def SaveSession(self):      def SaveSession(self):
205          save_session(self.session, self.session.filename)          save_session(self.session, self.session.filename)
206    
207      def set_map(self):      def maps_changed(self, *args):
208          if self.session.HasMaps():          if self.session.HasMaps():
209              self.top.SetMap(self.session.Maps()[0])              self.top.SetMap(self.session.Maps()[0])
210          else:          else:
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