/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/application.py
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revision 189 by bh, Tue May 28 12:39:17 2002 UTC revision 518 by jonathan, Tue Mar 11 17:34:21 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 19  from wxPython.wx import * Line 19  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  from interactor import Interactor
31  from mainwindow import MainWindow  import mainwindow
32    
33  from messages import SESSION_CHANGED  from messages import SESSION_REPLACED
34    
35    
36    
# Line 43  class ThubanApplication(wxApp, Publisher Line 45  class ThubanApplication(wxApp, Publisher
45      """      """
46    
47      def OnInit(self):      def OnInit(self):
48            self.splash = self.splash_screen()
49            if self.splash is not None:
50                self.splash.Show()
51          self.read_startup_files()          self.read_startup_files()
52          self.interactor = Interactor(None)          self.interactor = Interactor(None)
53          top = MainWindow(NULL, -1, self.interactor)          self.top = self.CreateMainWindow()
54          top.Show(true)          self.SetTopWindow(self.top)
55          self.top = top          if self.splash is None:
56          self.SetTopWindow(top)              self.ShowMainWindow()
57          self.session = None          self.session = None
58          self.create_session()          self.create_session()
59          return true          return True
60    
61        def OnExit(self):
62            """Clean up code.
63    
64            Extend this in derived classes if needed.
65            """
66            self.session.Destroy()
67            self.interactor.Destroy()
68            Publisher.Destroy(self)
69    
70        def MainLoop(self):
71            """Call the inherited MainLoop method and then call OnExit.
72    
73            In wxPython OnExit isn't called automatically, unfortunately, so
74            we do it here.
75            """
76            wxApp.MainLoop(self)
77            self.OnExit()
78    
79      def read_startup_files(self):      def read_startup_files(self):
80          """Read the startup files."""          """Read the startup files."""
# Line 67  class ThubanApplication(wxApp, Publisher Line 90  class ThubanApplication(wxApp, Publisher
90                      if tb.tb_next is not None:                      if tb.tb_next is not None:
91                          # The ImportError exception was raised from                          # The ImportError exception was raised from
92                          # inside the thubanstart module.                          # inside the thubanstart module.
93                          sys.stderr.write("Cannot import the thubanstart"                          sys.stderr.write(_("Cannot import the thubanstart"
94                                           "module\n")                                           "module\n"))
95                          traceback.print_exc(None, sys.stderr)                          traceback.print_exc(None, sys.stderr)
96                      else:                      else:
97                          # There's no thubanstart module.                          # There's no thubanstart module.
98                          sys.stderr.write("No thubanstart module available\n")                          sys.stderr.write(_("No thubanstart module available\n"))
99                  finally:                  finally:
100                      # make sure we delete the traceback object,                      # make sure we delete the traceback object,
101                      # otherwise there's be circular references involving                      # otherwise there's be circular references involving
102                      # the current stack frame                      # the current stack frame
103                      del tb                      del tb
104              except:              except:
105                  sys.stderr.write("Cannot import the thubanstart module\n")                  sys.stderr.write(_("Cannot import the thubanstart module\n"))
106                  traceback.print_exc(None, sys.stderr)                  traceback.print_exc(None, sys.stderr)
107          else:          else:
108              # There's no .thuban directory              # There's no .thuban directory
109              sys.stderr.write("No ~/.thuban directory\n")              sys.stderr.write(_("No ~/.thuban directory\n"))
110    
111        def splash_screen(self):
112            """Create and return a splash screen.
113    
114            This method is called by OnInit to determine whether the
115            application should have a splashscreen. If the application
116            should display a splash screen override this method in a derived
117            class and have it create and return the wxSplashScreen instance.
118            The implementation of this method in the derived class should
119            also arranged for ShowMainWindow to be called.
120    
121            The default implementation simply returns None so that no splash
122            screen is shown and ShowMainWindow will be called automatically.
123            """
124            return None
125    
126        def ShowMainWindow(self):
127            """Show the main window
128    
129            Normally this method is automatically called by OnInit to show
130            the main window. However, if the splash_screen method has
131            returned a splashscreen it is expected that the derived class
132            also arranges for ShowMainWindow to be called at the appropriate
133            time.
134            """
135            self.top.Show(True)
136          
137        def CreateMainWindow(self):
138            """Create and return the main window for the application.
139    
140            Override this in subclasses to instantiate the Thuban mainwindow
141            with different parameters or to use a different class for the
142            main window.
143    
144            when this method is called by OnInit self.interactor (to be used
145            for the interactor argument of the standard Thuban main window
146            class) has already been instantiated.
147            """
148            msg = (_("This is the wxPython-based Graphical User Interface"
149                   " for exploring geographic data"))
150            return mainwindow.MainWindow(NULL, -1, "Thuban", self, self.interactor,
151                                         initial_message = msg)
152    
153        def Session(self):
154            """Return the application's session object"""
155            return self.session
156    
157      def SetSession(self, session):      def SetSession(self, session):
158            """Make session the new session.
159    
160            Issue SESSION_REPLACED after self.session has become the new
161            session. After the session has been assigned call
162            self.subscribe_session() with the new session and
163            self.unsubscribe_session with the old one.
164            """
165          oldsession = self.session          oldsession = self.session
166          self.session = session          self.session = session
167          self.issue(SESSION_CHANGED)          self.subscribe_session(self.session)
168            self.issue(SESSION_REPLACED)
169          self.interactor.SetSession(session)          self.interactor.SetSession(session)
170          self.set_map()          self.maps_changed()
171          if oldsession is not None:          if oldsession is not None:
172                self.unsubscribe_session(oldsession)
173              oldsession.Destroy()              oldsession.Destroy()
174    
175        def subscribe_session(self, session):
176            """Subscribe to some of the sessions channels.
177    
178            Extend this method in derived classes if you need additional
179            channels.
180            """
181            session.Subscribe(MAPS_CHANGED, self.maps_changed)
182    
183        def unsubscribe_session(self, session):
184            """Unsubscribe from the sessions channels.
185    
186            Extend this method in derived classes if you subscribed to
187            additional channels in subscribe_session().
188            """
189            session.Unsubscribe(MAPS_CHANGED, self.maps_changed)
190    
191      def create_session(self):      def create_session(self):
192          # Create a simple default session          """Create a default session.
193    
194            Override this method in derived classes to instantiate the
195            session differently or to use a different session class. Don't
196            subscribe to channels here yet. Do that in the
197            subscribe_session() method.
198            """
199          self.SetSession(create_empty_session())          self.SetSession(create_empty_session())
200    
201      def OpenSession(self, filename):      def OpenSession(self, filename):
# Line 107  class ThubanApplication(wxApp, Publisher Line 207  class ThubanApplication(wxApp, Publisher
207      def SaveSession(self):      def SaveSession(self):
208          save_session(self.session, self.session.filename)          save_session(self.session, self.session.filename)
209    
210      def set_map(self):      def maps_changed(self, *args):
211          if self.session.HasMaps():          if self.session.HasMaps():
212              self.top.SetMap(self.session.Maps()[0])              self.top.SetMap(self.session.Maps()[0])
213          else:          else:
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