/[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 934 by jonathan, Tue May 20 15:24:03 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            self.session = None
66            Publisher.Destroy(self)
67    
68        def read_startup_files(self):
69            """Read the startup files."""
70            # for now the startup file is ~/.thuban/thubanstart.py
71            dir =os.path.expanduser("~/.thuban")
72            if os.path.isdir(dir):
73                sys.path.append(dir)
74                try:
75                    import thubanstart
76                except ImportError:
77                    tb = sys.exc_info()[2]
78                    try:
79                        if tb.tb_next is not None:
80                            # The ImportError exception was raised from
81                            # inside the thubanstart module.
82                            sys.stderr.write(_("Cannot import the thubanstart"
83                                             " module\n"))
84                            traceback.print_exc(None, sys.stderr)
85                        else:
86                            # There's no thubanstart module.
87                            sys.stderr.write(_("No thubanstart module available\n"))
88                    finally:
89                        # make sure we delete the traceback object,
90                        # otherwise there's be circular references involving
91                        # the current stack frame
92                        del tb
93                except:
94                    sys.stderr.write(_("Cannot import the thubanstart module\n"))
95                    traceback.print_exc(None, sys.stderr)
96            else:
97                # There's no .thuban directory
98                sys.stderr.write(_("No ~/.thuban directory\n"))
99    
100          f = wxFrame(top, -1, 'test', wxDefaultPosition, wxSize(300, 300))      def splash_screen(self):
101          self.tree = tree.myTreeCtrlPanel(f, self)          """Create and return a splash screen.
102          f.Show(true)  
103          return true          This method is called by OnInit to determine whether the
104            application should have a splashscreen. If the application
105            should display a splash screen override this method in a derived
106            class and have it create and return the wxSplashScreen instance.
107            The implementation of this method in the derived class should
108            also arranged for ShowMainWindow to be called.
109    
110            The default implementation simply returns None so that no splash
111            screen is shown and ShowMainWindow will be called automatically.
112            """
113            return None
114    
115        def ShowMainWindow(self):
116            """Show the main window
117    
118            Normally this method is automatically called by OnInit to show
119            the main window. However, if the splash_screen method has
120            returned a splashscreen it is expected that the derived class
121            also arranges for ShowMainWindow to be called at the appropriate
122            time.
123            """
124            self.top.Show(True)
125    
126        def CreateMainWindow(self):
127            """Create and return the main window for the application.
128    
129            Override this in subclasses to instantiate the Thuban mainwindow
130            with different parameters or to use a different class for the
131            main window.
132            """
133            msg = (_("This is the wxPython-based Graphical User Interface"
134                   " for exploring geographic data"))
135            return mainwindow.MainWindow(NULL, -1, "Thuban", self, None,
136                                         initial_message = msg,
137                                         size = (600, 400))
138    
139        def Session(self):
140            """Return the application's session object"""
141            return self.session
142    
143      def SetSession(self, session):      def SetSession(self, session):
144            """Make session the new session.
145    
146            Issue SESSION_REPLACED after self.session has become the new
147            session. After the session has been assigned call
148            self.subscribe_session() with the new session and
149            self.unsubscribe_session with the old one.
150            """
151          oldsession = self.session          oldsession = self.session
152          self.session = session          self.session = session
153          self.issue(SESSION_CHANGED)          self.subscribe_session(self.session)
154          self.interactor.SetSession(session)          self.issue(SESSION_REPLACED)
155          self.set_map()          self.maps_changed()
156          if oldsession is not None:          if oldsession is not None:
157                self.unsubscribe_session(oldsession)
158              oldsession.Destroy()              oldsession.Destroy()
159    
160        def subscribe_session(self, session):
161            """Subscribe to some of the sessions channels.
162    
163            Extend this method in derived classes if you need additional
164            channels.
165            """
166            session.Subscribe(MAPS_CHANGED, self.maps_changed)
167    
168        def unsubscribe_session(self, session):
169            """Unsubscribe from the sessions channels.
170    
171            Extend this method in derived classes if you subscribed to
172            additional channels in subscribe_session().
173            """
174            session.Unsubscribe(MAPS_CHANGED, self.maps_changed)
175    
176      def create_session(self):      def create_session(self):
177          # Create a simple default session          """Create a default session.
178    
179            Override this method in derived classes to instantiate the
180            session differently or to use a different session class. Don't
181            subscribe to channels here yet. Do that in the
182            subscribe_session() method.
183            """
184          self.SetSession(create_empty_session())          self.SetSession(create_empty_session())
185    
186      def OpenSession(self, filename):      def OpenSession(self, filename):
187            """Open the session in the file named filename"""
188            # Make sure we deal with an absolute pathname. Otherwise we can
189            # get problems when saving because the saving code expects an
190            # absolute directory name
191            filename = os.path.abspath(filename)
192          session = load_session(filename)          session = load_session(filename)
193          session.SetFilename(filename)          session.SetFilename(filename)
194          session.UnsetModified()          session.UnsetModified()
# Line 78  class ThubanApplication(wxApp, Publisher Line 197  class ThubanApplication(wxApp, Publisher
197      def SaveSession(self):      def SaveSession(self):
198          save_session(self.session, self.session.filename)          save_session(self.session, self.session.filename)
199    
200      def set_map(self):      def maps_changed(self, *args):
201          if self.session.HasMaps():          if self.session.HasMaps():
202              self.top.SetMap(self.session.Maps()[0])              self.top.SetMap(self.session.Maps()[0])
203          else:          else:
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