Thuban/UI/application.py

# Copyright (C) 2001, 2002 by Intevation GmbH
# Authors:
# Jan-Oliver Wagner <[email protected]>
# Bernhard Herzog <[email protected]>
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with Thuban for details.

"""
Thuban's application object.
"""

__version__ = "$Revision$"

import sys, os
import traceback

from wxPython.wx import *

from Thuban.Lib.connector import Publisher

from Thuban import _
from Thuban.Model.session import create_empty_session
from Thuban.Model.save import save_session
from Thuban.Model.load import load_session
from Thuban.Model.messages import MAPS_CHANGED

import view
import tree
from interactor import Interactor
import mainwindow

from messages import SESSION_CHANGED


class ThubanApplication(wxApp, Publisher):

    """
    Thuban's application class.

    All wxWindows programs have to have an instance of an application
    class derived from wxApp. In Thuban the application class holds
    references to the main window, the session and the interactor.
    """

    def OnInit(self):
        self.read_startup_files()
        self.interactor = Interactor(None)
        top = self.CreateMainWindow()
        top.Show(true)
        self.top = top
        self.SetTopWindow(top)
        self.session = None
        self.create_session()
        return true

    def OnExit(self):
        """Clean up code.

        Extend this in derived classes if needed.
        """
        self.session.Destroy()
        self.interactor.Destroy()
        Publisher.Destroy(self)

    def MainLoop(self):
        """Call the inherited MainLoop method and then call OnExit.

        In wxPython OnExit isn't called automatically, unfortunately, so
        we do it here.
        """
        wxApp.MainLoop(self)
        self.OnExit()

    def read_startup_files(self):
        """Read the startup files."""
        # for now the startup file is ~/.thuban/thubanstart.py
        dir =os.path.expanduser("~/.thuban")
        if os.path.isdir(dir):
            sys.path.append(dir)
            try:
                import thubanstart
            except ImportError:
                tb = sys.exc_info()[2]
                try:
                    if tb.tb_next is not None:
                        # The ImportError exception was raised from
                        # inside the thubanstart module.
                        sys.stderr.write(_("Cannot import the thubanstart"
                                         "module\n"))
                        traceback.print_exc(None, sys.stderr)
                    else:
                        # There's no thubanstart module.
                        sys.stderr.write(_("No thubanstart module available\n"))
                finally:
                    # make sure we delete the traceback object,
                    # otherwise there's be circular references involving
                    # the current stack frame
                    del tb
            except:
                sys.stderr.write(_("Cannot import the thubanstart module\n"))
                traceback.print_exc(None, sys.stderr)
        else:
            # There's no .thuban directory
            sys.stderr.write(_("No ~/.thuban directory\n"))

    def CreateMainWindow(self):
        """Create and return the main window for the application.

        Override this in subclasses to instantiate the Thuban mainwindow
        with different parameters or to use a different class for the
        main window.

        when this method is called by OnInit self.interactor (to be used
        for the interactor argument of the standard Thuban main window
        class) has already been instantiated.
        """
        msg = (_("This is the wxPython-based Graphical User Interface"
               " for exploring geographic data"))
        return mainwindow.MainWindow(NULL, -1, "Thuban", self, self.interactor,
                                     initial_message = msg)

    def Session(self):
        """Return the application's session object"""
        return self.session

    def SetSession(self, session):
        """Make session the new session.

        Issue SESSION_CHANGED after self.session has become the new
        session. After the session has been assigned call
        self.subscribe_session() with the new session and
        self.unsubscribe_session with the old one.
        """
        oldsession = self.session
        self.session = session
        self.subscribe_session(self.session)
        self.issue(SESSION_CHANGED)
        self.interactor.SetSession(session)
        self.maps_changed()
        if oldsession is not None:
            self.unsubscribe_session(oldsession)
            oldsession.Destroy()

    def subscribe_session(self, session):
        """Subscribe to some of the sessions channels.

        Extend this method in derived classes if you need additional
        channels.
        """
        session.Subscribe(MAPS_CHANGED, self.maps_changed)

    def unsubscribe_session(self, session):
        """Unsubscribe from the sessions channels.

        Extend this method in derived classes if you subscribed to
        additional channels in subscribe_session().
        """
        session.Unsubscribe(MAPS_CHANGED, self.maps_changed)

    def create_session(self):
        """Create a default session.

        Override this method in derived classes to instantiate the
        session differently or to use a different session class. Don't
        subscribe to channels here yet. Do that in the
        subscribe_session() method.
        """
        self.SetSession(create_empty_session())

    def OpenSession(self, filename):
        session = load_session(filename)
        session.SetFilename(filename)
        session.UnsetModified()
        self.SetSession(session)

    def SaveSession(self):
        save_session(self.session, self.session.filename)

    def maps_changed(self, *args):
        if self.session.HasMaps():
            self.top.SetMap(self.session.Maps()[0])
        else:
            self.top.SetMap(None)
1	# Copyright (C) 2001, 2002 by Intevation GmbH
2	# Authors:
3	# Jan-Oliver Wagner <[email protected]>
4	# Bernhard Herzog <[email protected]>
5	#
6	# This program is free software under the GPL (>=v2)
7	# Read the file COPYING coming with Thuban for details.
8
9	"""
10	Thuban's application object.
11	"""
12
13	__version__ = "$Revision$"
14
15	import sys, os
16	import traceback
17
18	from wxPython.wx import *
19
20	from Thuban.Lib.connector import Publisher
21
22	from Thuban import _
23	from Thuban.Model.session import create_empty_session
24	from Thuban.Model.save import save_session
25	from Thuban.Model.load import load_session
26	from Thuban.Model.messages import MAPS_CHANGED
27
28	import view
29	import tree
30	from interactor import Interactor
31	import mainwindow
32
33	from messages import SESSION_CHANGED
34
35
36
37	class ThubanApplication(wxApp, Publisher):
38
39	"""
40	Thuban's application class.
41
42	All wxWindows programs have to have an instance of an application
43	class derived from wxApp. In Thuban the application class holds
44	references to the main window, the session and the interactor.
45	"""
46
47	def OnInit(self):
48	self.read_startup_files()
49	self.interactor = Interactor(None)
50	top = self.CreateMainWindow()
51	top.Show(true)
52	self.top = top
53	self.SetTopWindow(top)
54	self.session = None
55	self.create_session()
56	return true
57
58	def OnExit(self):
59	"""Clean up code.
60
61	Extend this in derived classes if needed.
62	"""
63	self.session.Destroy()
64	self.interactor.Destroy()
65	Publisher.Destroy(self)
66
67	def MainLoop(self):
68	"""Call the inherited MainLoop method and then call OnExit.
69
70	In wxPython OnExit isn't called automatically, unfortunately, so
71	we do it here.
72	"""
73	wxApp.MainLoop(self)
74	self.OnExit()
75
76	def read_startup_files(self):
77	"""Read the startup files."""
78	# for now the startup file is ~/.thuban/thubanstart.py
79	dir =os.path.expanduser("~/.thuban")
80	if os.path.isdir(dir):
81	sys.path.append(dir)
82	try:
83	import thubanstart
84	except ImportError:
85	tb = sys.exc_info()[2]
86	try:
87	if tb.tb_next is not None:
88	# The ImportError exception was raised from
89	# inside the thubanstart module.
90	sys.stderr.write(_("Cannot import the thubanstart"
91	"module\n"))
92	traceback.print_exc(None, sys.stderr)
93	else:
94	# There's no thubanstart module.
95	sys.stderr.write(_("No thubanstart module available\n"))
96	finally:
97	# make sure we delete the traceback object,
98	# otherwise there's be circular references involving
99	# the current stack frame
100	del tb
101	except:
102	sys.stderr.write(_("Cannot import the thubanstart module\n"))
103	traceback.print_exc(None, sys.stderr)
104	else:
105	# There's no .thuban directory
106	sys.stderr.write(_("No ~/.thuban directory\n"))
107
108	def CreateMainWindow(self):
109	"""Create and return the main window for the application.
110
111	Override this in subclasses to instantiate the Thuban mainwindow
112	with different parameters or to use a different class for the
113	main window.
114
115	when this method is called by OnInit self.interactor (to be used
116	for the interactor argument of the standard Thuban main window
117	class) has already been instantiated.
118	"""
119	msg = (_("This is the wxPython-based Graphical User Interface"
120	" for exploring geographic data"))
121	return mainwindow.MainWindow(NULL, -1, "Thuban", self, self.interactor,
122	initial_message = msg)
123
124	def Session(self):
125	"""Return the application's session object"""
126	return self.session
127
128	def SetSession(self, session):
129	"""Make session the new session.
130
131	Issue SESSION_CHANGED after self.session has become the new
132	session. After the session has been assigned call
133	self.subscribe_session() with the new session and
134	self.unsubscribe_session with the old one.
135	"""
136	oldsession = self.session
137	self.session = session
138	self.subscribe_session(self.session)
139	self.issue(SESSION_CHANGED)
140	self.interactor.SetSession(session)
141	self.maps_changed()
142	if oldsession is not None:
143	self.unsubscribe_session(oldsession)
144	oldsession.Destroy()
145
146	def subscribe_session(self, session):
147	"""Subscribe to some of the sessions channels.
148
149	Extend this method in derived classes if you need additional
150	channels.
151	"""
152	session.Subscribe(MAPS_CHANGED, self.maps_changed)
153
154	def unsubscribe_session(self, session):
155	"""Unsubscribe from the sessions channels.
156
157	Extend this method in derived classes if you subscribed to
158	additional channels in subscribe_session().
159	"""
160	session.Unsubscribe(MAPS_CHANGED, self.maps_changed)
161
162	def create_session(self):
163	"""Create a default session.
164
165	Override this method in derived classes to instantiate the
166	session differently or to use a different session class. Don't
167	subscribe to channels here yet. Do that in the
168	subscribe_session() method.
169	"""
170	self.SetSession(create_empty_session())
171
172	def OpenSession(self, filename):
173	session = load_session(filename)
174	session.SetFilename(filename)
175	session.UnsetModified()
176	self.SetSession(session)
177
178	def SaveSession(self):
179	save_session(self.session, self.session.filename)
180
181	def maps_changed(self, *args):
182	if self.session.HasMaps():
183	self.top.SetMap(self.session.Maps()[0])
184	else:
185	self.top.SetMap(None)
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svn:keywords	Author Date Id Revision