/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/application.py
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revision 235 by bh, Tue Jul 23 10:56:29 2002 UTC revision 1162 by jonathan, Thu Jun 12 12:41:16 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    from Thuban.Model.layer import RasterLayer
31    import Thuban.Model.resource
32    
33  import view  import view
34  import tree  import tree
 from interactor import Interactor  
35  import mainwindow  import mainwindow
36    
37  from messages import SESSION_CHANGED  from messages import SESSION_REPLACED
38    
39    
40    
# Line 39  class ThubanApplication(wxApp, Publisher Line 45  class ThubanApplication(wxApp, Publisher
45    
46      All wxWindows programs have to have an instance of an application      All wxWindows programs have to have an instance of an application
47      class derived from wxApp. In Thuban the application class holds      class derived from wxApp. In Thuban the application class holds
48      references to the main window, the session and the interactor.      references to the main window and the session.
49      """      """
50    
51      def OnInit(self):      def OnInit(self):
52            self.splash = self.splash_screen()
53            if self.splash is not None:
54                self.splash.Show()
55          self.read_startup_files()          self.read_startup_files()
56          self.interactor = Interactor(None)          self.top = self.CreateMainWindow()
57          top = self.CreateMainWindow()          self.SetTopWindow(self.top)
58          top.Show(true)          if self.splash is None:
59          self.top = top              self.ShowMainWindow()
         self.SetTopWindow(top)  
60          self.session = None          self.session = None
61          self.create_session()          self.create_session()
62          return true          return True
63    
64        def OnExit(self):
65            """Clean up code.
66    
67            Extend this in derived classes if needed.
68            """
69            self.session.Destroy()
70            self.session = None
71            Publisher.Destroy(self)
72    
73      def read_startup_files(self):      def read_startup_files(self):
74          """Read the startup files."""          """Read the startup files."""
75          # for now the startup file is ~/.thuban/thubanstart.py          # for now the startup file is ~/.thuban/thubanstart.py
76          dir =os.path.expanduser("~/.thuban")          dir = get_application_dir()
77          if os.path.isdir(dir):          if os.path.isdir(dir):
78              sys.path.append(dir)              sys.path.append(dir)
79              try:              try:
# Line 67  class ThubanApplication(wxApp, Publisher Line 84  class ThubanApplication(wxApp, Publisher
84                      if tb.tb_next is not None:                      if tb.tb_next is not None:
85                          # The ImportError exception was raised from                          # The ImportError exception was raised from
86                          # inside the thubanstart module.                          # inside the thubanstart module.
87                          sys.stderr.write("Cannot import the thubanstart"                          sys.stderr.write(_("Cannot import the thubanstart"
88                                           "module\n")                                           " module\n"))
89                          traceback.print_exc(None, sys.stderr)                          traceback.print_exc(None, sys.stderr)
90                      else:                      else:
91                          # There's no thubanstart module.                          # There's no thubanstart module.
92                          sys.stderr.write("No thubanstart module available\n")                          sys.stderr.write(_("No thubanstart module available\n"))
93                  finally:                  finally:
94                      # make sure we delete the traceback object,                      # make sure we delete the traceback object,
95                      # otherwise there's be circular references involving                      # otherwise there's be circular references involving
96                      # the current stack frame                      # the current stack frame
97                      del tb                      del tb
98              except:              except:
99                  sys.stderr.write("Cannot import the thubanstart module\n")                  sys.stderr.write(_("Cannot import the thubanstart module\n"))
100                  traceback.print_exc(None, sys.stderr)                  traceback.print_exc(None, sys.stderr)
101          else:          else:
102              # There's no .thuban directory              # There's no .thuban directory
103              sys.stderr.write("No ~/.thuban directory\n")              sys.stderr.write(_("No ~/.thuban directory\n"))
104    
105        def splash_screen(self):
106            """Create and return a splash screen.
107    
108            This method is called by OnInit to determine whether the
109            application should have a splashscreen. If the application
110            should display a splash screen override this method in a derived
111            class and have it create and return the wxSplashScreen instance.
112            The implementation of this method in the derived class should
113            also arranged for ShowMainWindow to be called.
114    
115            The default implementation simply returns None so that no splash
116            screen is shown and ShowMainWindow will be called automatically.
117            """
118            return None
119    
120        def ShowMainWindow(self):
121            """Show the main window
122    
123            Normally this method is automatically called by OnInit to show
124            the main window. However, if the splash_screen method has
125            returned a splashscreen it is expected that the derived class
126            also arranges for ShowMainWindow to be called at the appropriate
127            time.
128            """
129            self.top.Show(True)
130    
131      def CreateMainWindow(self):      def CreateMainWindow(self):
132          """Create and return the main window for the application.          """Create and return the main window for the application.
# Line 91  class ThubanApplication(wxApp, Publisher Line 134  class ThubanApplication(wxApp, Publisher
134          Override this in subclasses to instantiate the Thuban mainwindow          Override this in subclasses to instantiate the Thuban mainwindow
135          with different parameters or to use a different class for the          with different parameters or to use a different class for the
136          main window.          main window.
137            """
138          when this method is called by OnInit self.interactor (to be used          msg = (_("This is the wxPython-based Graphical User Interface"
139          for the interactor argument of the standard Thuban main window                 " for exploring geographic data"))
140          class) has already been instantiated.          return mainwindow.MainWindow(NULL, -1, "Thuban", self, None,
141          """                                       initial_message = msg,
142          msg = ("This is the wxPython-based Graphical User Interface"                                       size = (600, 400))
                " for exploring geographic data")  
         return mainwindow.MainWindow(NULL, -1, "Thuban", self, self.interactor,  
                                      initial_message = msg)  
143    
144      def Session(self):      def Session(self):
145          """Return the application's session object"""          """Return the application's session object"""
# Line 108  class ThubanApplication(wxApp, Publisher Line 148  class ThubanApplication(wxApp, Publisher
148      def SetSession(self, session):      def SetSession(self, session):
149          """Make session the new session.          """Make session the new session.
150    
151          Issue SESSION_CHANGED.          Issue SESSION_REPLACED after self.session has become the new
152            session. After the session has been assigned call
153            self.subscribe_session() with the new session and
154            self.unsubscribe_session with the old one.
155          """          """
156          oldsession = self.session          oldsession = self.session
157          self.session = session          self.session = session
158          self.issue(SESSION_CHANGED)          self.subscribe_session(self.session)
159          self.interactor.SetSession(session)          self.issue(SESSION_REPLACED)
160          self.set_map()          self.maps_changed()
161          if oldsession is not None:          if oldsession is not None:
162                self.unsubscribe_session(oldsession)
163              oldsession.Destroy()              oldsession.Destroy()
164    
165        def subscribe_session(self, session):
166            """Subscribe to some of the sessions channels.
167    
168            Extend this method in derived classes if you need additional
169            channels.
170            """
171            session.Subscribe(MAPS_CHANGED, self.maps_changed)
172    
173        def unsubscribe_session(self, session):
174            """Unsubscribe from the sessions channels.
175    
176            Extend this method in derived classes if you subscribed to
177            additional channels in subscribe_session().
178            """
179            session.Unsubscribe(MAPS_CHANGED, self.maps_changed)
180    
181      def create_session(self):      def create_session(self):
182          # Create a simple default session          """Create a default session.
183    
184            Override this method in derived classes to instantiate the
185            session differently or to use a different session class. Don't
186            subscribe to channels here yet. Do that in the
187            subscribe_session() method.
188            """
189          self.SetSession(create_empty_session())          self.SetSession(create_empty_session())
190    
191      def OpenSession(self, filename):      def OpenSession(self, filename):
192            """Open the session in the file named filename"""
193            # Make sure we deal with an absolute pathname. Otherwise we can
194            # get problems when saving because the saving code expects an
195            # absolute directory name
196            filename = os.path.abspath(filename)
197          session = load_session(filename)          session = load_session(filename)
198          session.SetFilename(filename)          session.SetFilename(filename)
199          session.UnsetModified()          session.UnsetModified()
200          self.SetSession(session)          self.SetSession(session)
201    
202            for map in session.Maps():
203                for layer in map.Layers():
204                    if isinstance(layer, RasterLayer) \
205                        and not Thuban.Model.resource.has_gdal_support():
206                        msg = _("The current session contains Image layers,\n" +
207                                "but the GDAL library is not available to " +
208                                "draw them.")
209                        dlg = wx.wxMessageDialog(None,
210                                                 msg,
211                                                 _("Library not available"),
212                                                 wx.wxOK | wx.wxICON_INFORMATION)
213                        print msg
214                        dlg.ShowModal()
215                        dlg.Destroy()
216                        break
217    
218      def SaveSession(self):      def SaveSession(self):
219          save_session(self.session, self.session.filename)          save_session(self.session, self.session.filename)
220    
221      def set_map(self):      def maps_changed(self, *args):
222          if self.session.HasMaps():          if self.session.HasMaps():
223              self.top.SetMap(self.session.Maps()[0])              self.top.SetMap(self.session.Maps()[0])
224          else:          else:
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