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