/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/application.py
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revision 25 by bh, Wed Sep 5 13:36:13 2001 UTC revision 1133 by frank, Thu Jun 5 13:27:33 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 os.path
17    from tempfile import mktemp
18    
19    import traceback
20    
21  from wxPython.wx import *  from wxPython.wx import *
22    
23  from Thuban.Lib.connector import Publisher  from Thuban.Lib.connector import Publisher
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
33  from interactor import Interactor  import mainwindow
 from mainwindow import MainWindow  
34    
35  from messages import SESSION_CHANGED  from messages import SESSION_REPLACED
36    
37    
38    
# Line 35  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.interactor = Interactor(None)          self.splash = self.splash_screen()
51          top = MainWindow(NULL, -1, self.interactor)          if self.splash is not None:
52          top.Show(true)              self.splash.Show()
53          self.top = top          self.read_startup_files()
54          self.SetTopWindow(top)          self.top = self.CreateMainWindow()
55            self.SetTopWindow(self.top)
56            if self.splash is None:
57                self.ShowMainWindow()
58          self.session = None          self.session = None
59          self.create_session()          self.create_session()
60            return True
61    
62          f = wxFrame(top, -1, 'test', wxDefaultPosition, wxSize(300, 300))      def OnExit(self):
63          self.tree = tree.myTreeCtrlPanel(f, self)          """Clean up code.
64          f.Show(true)  
65          return true          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):
72            """Read the startup files."""
73            # for now the startup file is ~/.thuban/thubanstart.py
74            if os.name == 'nt':
75                # This should result in something like the user directory ...
76                guess = os.path.dirname(os.path.dirname(os.path.dirname(mktemp())))
77                dir = os.path.join(guess, ".thuban")
78                if not os.path.isdir(dir):
79                    os.mkdir(dir)
80            else:
81                dir =os.path.expanduser("~/.thuban")
82            if os.path.isdir(dir):
83                sys.path.append(dir)
84                try:
85                    import thubanstart
86                except ImportError:
87                    tb = sys.exc_info()[2]
88                    try:
89                        if tb.tb_next is not None:
90                            # The ImportError exception was raised from
91                            # inside the thubanstart module.
92                            sys.stderr.write(_("Cannot import the thubanstart"
93                                             " module\n"))
94                            traceback.print_exc(None, sys.stderr)
95                        else:
96                            # There's no thubanstart module.
97                            sys.stderr.write(_("No thubanstart module available\n"))
98                    finally:
99                        # make sure we delete the traceback object,
100                        # otherwise there's be circular references involving
101                        # the current stack frame
102                        del tb
103                except:
104                    sys.stderr.write(_("Cannot import the thubanstart module\n"))
105                    traceback.print_exc(None, sys.stderr)
106            else:
107                # There's no .thuban directory
108                sys.stderr.write(_("No ~/.thuban directory\n"))
109    
110        def splash_screen(self):
111            """Create and return a splash screen.
112    
113            This method is called by OnInit to determine whether the
114            application should have a splashscreen. If the application
115            should display a splash screen override this method in a derived
116            class and have it create and return the wxSplashScreen instance.
117            The implementation of this method in the derived class should
118            also arranged for ShowMainWindow to be called.
119    
120            The default implementation simply returns None so that no splash
121            screen is shown and ShowMainWindow will be called automatically.
122            """
123            return None
124    
125        def ShowMainWindow(self):
126            """Show the main window
127    
128            Normally this method is automatically called by OnInit to show
129            the main window. However, if the splash_screen method has
130            returned a splashscreen it is expected that the derived class
131            also arranges for ShowMainWindow to be called at the appropriate
132            time.
133            """
134            self.top.Show(True)
135    
136        def CreateMainWindow(self):
137            """Create and return the main window for the application.
138    
139            Override this in subclasses to instantiate the Thuban mainwindow
140            with different parameters or to use a different class for the
141            main window.
142            """
143            msg = (_("This is the wxPython-based Graphical User Interface"
144                   " for exploring geographic data"))
145            return mainwindow.MainWindow(NULL, -1, "Thuban", self, None,
146                                         initial_message = msg,
147                                         size = (600, 400))
148    
149        def Session(self):
150            """Return the application's session object"""
151            return self.session
152    
153      def SetSession(self, session):      def SetSession(self, session):
154            """Make session the new session.
155    
156            Issue SESSION_REPLACED after self.session has become the new
157            session. After the session has been assigned call
158            self.subscribe_session() with the new session and
159            self.unsubscribe_session with the old one.
160            """
161          oldsession = self.session          oldsession = self.session
162          self.session = session          self.session = session
163          self.issue(SESSION_CHANGED)          self.subscribe_session(self.session)
164          self.interactor.SetSession(session)          self.issue(SESSION_REPLACED)
165          self.set_map()          self.maps_changed()
166          if oldsession is not None:          if oldsession is not None:
167                self.unsubscribe_session(oldsession)
168              oldsession.Destroy()              oldsession.Destroy()
169    
170        def subscribe_session(self, session):
171            """Subscribe to some of the sessions channels.
172    
173            Extend this method in derived classes if you need additional
174            channels.
175            """
176            session.Subscribe(MAPS_CHANGED, self.maps_changed)
177    
178        def unsubscribe_session(self, session):
179            """Unsubscribe from the sessions channels.
180    
181            Extend this method in derived classes if you subscribed to
182            additional channels in subscribe_session().
183            """
184            session.Unsubscribe(MAPS_CHANGED, self.maps_changed)
185    
186      def create_session(self):      def create_session(self):
187          # Create a simple default session          """Create a default session.
188    
189            Override this method in derived classes to instantiate the
190            session differently or to use a different session class. Don't
191            subscribe to channels here yet. Do that in the
192            subscribe_session() method.
193            """
194          self.SetSession(create_empty_session())          self.SetSession(create_empty_session())
195    
196      def OpenSession(self, filename):      def OpenSession(self, filename):
197            """Open the session in the file named filename"""
198            # Make sure we deal with an absolute pathname. Otherwise we can
199            # get problems when saving because the saving code expects an
200            # absolute directory name
201            filename = os.path.abspath(filename)
202          session = load_session(filename)          session = load_session(filename)
203          session.SetFilename(filename)          session.SetFilename(filename)
204          session.UnsetModified()          session.UnsetModified()
# Line 74  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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