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	bh	189	# Copyright (C) 2001, 2002 by Intevation GmbH
2	bh	6	# Authors:
3			# Jan-Oliver Wagner <[email protected]>
4	bh	189	# Bernhard Herzog <[email protected]>
5	bh	6	#
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	bh	189	import sys, os
16			import traceback
17
18	bh	6	from wxPython.wx import *
19
20			from Thuban.Lib.connector import Publisher
21
22	jan	374	from Thuban import _
23	bh	6	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	bh	242	from Thuban.Model.messages import MAPS_CHANGED
27	bh	6
28			import view
29			import tree
30			from interactor import Interactor
31	bh	215	import mainwindow
32	bh	6
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	bh	189	self.read_startup_files()
49	bh	6	self.interactor = Interactor(None)
50	bh	235	top = self.CreateMainWindow()
51	bh	6	top.Show(true)
52			self.top = top
53			self.SetTopWindow(top)
54			self.session = None
55			self.create_session()
56			return true
57
58	bh	251	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	bh	189	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	jan	374	sys.stderr.write(_("Cannot import the thubanstart"
91			"module\n"))
92	bh	189	traceback.print_exc(None, sys.stderr)
93			else:
94			# There's no thubanstart module.
95	jan	374	sys.stderr.write(_("No thubanstart module available\n"))
96	bh	189	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	jan	374	sys.stderr.write(_("Cannot import the thubanstart module\n"))
103	bh	189	traceback.print_exc(None, sys.stderr)
104			else:
105			# There's no .thuban directory
106	jan	374	sys.stderr.write(_("No ~/.thuban directory\n"))
107	bh	189
108	bh	235	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	jan	374	msg = (_("This is the wxPython-based Graphical User Interface"
120			" for exploring geographic data"))
121	bh	235	return mainwindow.MainWindow(NULL, -1, "Thuban", self, self.interactor,
122			initial_message = msg)
123
124	bh	219	def Session(self):
125			"""Return the application's session object"""
126			return self.session
127
128	bh	6	def SetSession(self, session):
129	bh	219	"""Make session the new session.
130
131	bh	242	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	bh	219	"""
136	bh	6	oldsession = self.session
137			self.session = session
138	bh	242	self.subscribe_session(self.session)
139	bh	6	self.issue(SESSION_CHANGED)
140			self.interactor.SetSession(session)
141	bh	242	self.maps_changed()
142	bh	6	if oldsession is not None:
143	bh	242	self.unsubscribe_session(oldsession)
144	bh	6	oldsession.Destroy()
145
146	bh	242	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	bh	6	def create_session(self):
163	bh	242	"""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	bh	6	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	bh	242	def maps_changed(self, *args):
182	bh	6	if self.session.HasMaps():
183			self.top.SetMap(self.session.Maps()[0])
184			else:
185			self.top.SetMap(None)
Name	Value
svn:eol-style	native
svn:keywords	Author Date Id Revision