/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/application.py
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revision 229 by bh, Thu Jul 18 16:27:44 2002 UTC revision 1150 by frank, Wed Jun 11 10:45:49 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    
22  from Thuban.Lib.connector import Publisher  from Thuban.Lib.connector import Publisher
23    from Thuban.Lib.fileutil import get_application_dir
24    
25    from Thuban import _
26  from Thuban.Model.session import create_empty_session  from Thuban.Model.session import create_empty_session
27  from Thuban.Model.save import save_session  from Thuban.Model.save import save_session
28  from Thuban.Model.load import load_session  from Thuban.Model.load import load_session
29    from Thuban.Model.messages import MAPS_CHANGED
30    
31  import view  import view
32  import tree  import tree
 from interactor import Interactor  
33  import mainwindow  import mainwindow
34    
35  from messages import SESSION_CHANGED  from messages import SESSION_REPLACED
36    
37    
38    
# Line 39  class ThubanApplication(wxApp, Publisher Line 43  class ThubanApplication(wxApp, Publisher
43    
44      All wxWindows programs have to have an instance of an application      All wxWindows programs have to have an instance of an application
45      class derived from wxApp. In Thuban the application class holds      class derived from wxApp. In Thuban the application class holds
46      references to the main window, the session and the interactor.      references to the main window and the session.
47      """      """
48    
49      def OnInit(self):      def OnInit(self):
50            self.splash = self.splash_screen()
51            if self.splash is not None:
52                self.splash.Show()
53          self.read_startup_files()          self.read_startup_files()
54          self.interactor = Interactor(None)          self.top = self.CreateMainWindow()
55          top = mainwindow.MainWindow(NULL, -1, self, self.interactor)          self.SetTopWindow(self.top)
56          top.Show(true)          if self.splash is None:
57          self.top = top              self.ShowMainWindow()
         self.SetTopWindow(top)  
58          self.session = None          self.session = None
59          self.create_session()          self.create_session()
60          return true          return True
61    
62        def OnExit(self):
63            """Clean up code.
64    
65            Extend this in derived classes if needed.
66            """
67            self.session.Destroy()
68            self.session = None
69            Publisher.Destroy(self)
70    
71      def read_startup_files(self):      def read_startup_files(self):
72          """Read the startup files."""          """Read the startup files."""
73          # for now the startup file is ~/.thuban/thubanstart.py          # for now the startup file is ~/.thuban/thubanstart.py
74          dir =os.path.expanduser("~/.thuban")          dir = get_application_dir()
75          if os.path.isdir(dir):          if os.path.isdir(dir):
76              sys.path.append(dir)              sys.path.append(dir)
77              try:              try:
# Line 67  class ThubanApplication(wxApp, Publisher Line 82  class ThubanApplication(wxApp, Publisher
82                      if tb.tb_next is not None:                      if tb.tb_next is not None:
83                          # The ImportError exception was raised from                          # The ImportError exception was raised from
84                          # inside the thubanstart module.                          # inside the thubanstart module.
85                          sys.stderr.write("Cannot import the thubanstart"                          sys.stderr.write(_("Cannot import the thubanstart"
86                                           "module\n")                                           " module\n"))
87                          traceback.print_exc(None, sys.stderr)                          traceback.print_exc(None, sys.stderr)
88                      else:                      else:
89                          # There's no thubanstart module.                          # There's no thubanstart module.
90                          sys.stderr.write("No thubanstart module available\n")                          sys.stderr.write(_("No thubanstart module available\n"))
91                  finally:                  finally:
92                      # make sure we delete the traceback object,                      # make sure we delete the traceback object,
93                      # otherwise there's be circular references involving                      # otherwise there's be circular references involving
94                      # the current stack frame                      # the current stack frame
95                      del tb                      del tb
96              except:              except:
97                  sys.stderr.write("Cannot import the thubanstart module\n")                  sys.stderr.write(_("Cannot import the thubanstart module\n"))
98                  traceback.print_exc(None, sys.stderr)                  traceback.print_exc(None, sys.stderr)
99          else:          else:
100              # There's no .thuban directory              # There's no .thuban directory
101              sys.stderr.write("No ~/.thuban directory\n")              sys.stderr.write(_("No ~/.thuban directory\n"))
102    
103        def splash_screen(self):
104            """Create and return a splash screen.
105    
106            This method is called by OnInit to determine whether the
107            application should have a splashscreen. If the application
108            should display a splash screen override this method in a derived
109            class and have it create and return the wxSplashScreen instance.
110            The implementation of this method in the derived class should
111            also arranged for ShowMainWindow to be called.
112    
113            The default implementation simply returns None so that no splash
114            screen is shown and ShowMainWindow will be called automatically.
115            """
116            return None
117    
118        def ShowMainWindow(self):
119            """Show the main window
120    
121            Normally this method is automatically called by OnInit to show
122            the main window. However, if the splash_screen method has
123            returned a splashscreen it is expected that the derived class
124            also arranges for ShowMainWindow to be called at the appropriate
125            time.
126            """
127            self.top.Show(True)
128    
129        def CreateMainWindow(self):
130            """Create and return the main window for the application.
131    
132            Override this in subclasses to instantiate the Thuban mainwindow
133            with different parameters or to use a different class for the
134            main window.
135            """
136            msg = (_("This is the wxPython-based Graphical User Interface"
137                   " for exploring geographic data"))
138            return mainwindow.MainWindow(NULL, -1, "Thuban", self, None,
139                                         initial_message = msg,
140                                         size = (600, 400))
141    
142      def Session(self):      def Session(self):
143          """Return the application's session object"""          """Return the application's session object"""
# Line 92  class ThubanApplication(wxApp, Publisher Line 146  class ThubanApplication(wxApp, Publisher
146      def SetSession(self, session):      def SetSession(self, session):
147          """Make session the new session.          """Make session the new session.
148    
149          Issue SESSION_CHANGED.          Issue SESSION_REPLACED after self.session has become the new
150            session. After the session has been assigned call
151            self.subscribe_session() with the new session and
152            self.unsubscribe_session with the old one.
153          """          """
154          oldsession = self.session          oldsession = self.session
155          self.session = session          self.session = session
156          self.issue(SESSION_CHANGED)          self.subscribe_session(self.session)
157          self.interactor.SetSession(session)          self.issue(SESSION_REPLACED)
158          self.set_map()          self.maps_changed()
159          if oldsession is not None:          if oldsession is not None:
160                self.unsubscribe_session(oldsession)
161              oldsession.Destroy()              oldsession.Destroy()
162    
163        def subscribe_session(self, session):
164            """Subscribe to some of the sessions channels.
165    
166            Extend this method in derived classes if you need additional
167            channels.
168            """
169            session.Subscribe(MAPS_CHANGED, self.maps_changed)
170    
171        def unsubscribe_session(self, session):
172            """Unsubscribe from the sessions channels.
173    
174            Extend this method in derived classes if you subscribed to
175            additional channels in subscribe_session().
176            """
177            session.Unsubscribe(MAPS_CHANGED, self.maps_changed)
178    
179      def create_session(self):      def create_session(self):
180          # Create a simple default session          """Create a default session.
181    
182            Override this method in derived classes to instantiate the
183            session differently or to use a different session class. Don't
184            subscribe to channels here yet. Do that in the
185            subscribe_session() method.
186            """
187          self.SetSession(create_empty_session())          self.SetSession(create_empty_session())
188    
189      def OpenSession(self, filename):      def OpenSession(self, filename):
190            """Open the session in the file named filename"""
191            # Make sure we deal with an absolute pathname. Otherwise we can
192            # get problems when saving because the saving code expects an
193            # absolute directory name
194            filename = os.path.abspath(filename)
195          session = load_session(filename)          session = load_session(filename)
196          session.SetFilename(filename)          session.SetFilename(filename)
197          session.UnsetModified()          session.UnsetModified()
# Line 115  class ThubanApplication(wxApp, Publisher Line 200  class ThubanApplication(wxApp, Publisher
200      def SaveSession(self):      def SaveSession(self):
201          save_session(self.session, self.session.filename)          save_session(self.session, self.session.filename)
202    
203      def set_map(self):      def maps_changed(self, *args):
204          if self.session.HasMaps():          if self.session.HasMaps():
205              self.top.SetMap(self.session.Maps()[0])              self.top.SetMap(self.session.Maps()[0])
206          else:          else:
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