| 1 |
# Copyright (C) 2001, 2002, 2003 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_REPLACED |
| 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.splash = self.splash_screen() |
| 49 |
if self.splash is not None: |
| 50 |
self.splash.Show() |
| 51 |
self.read_startup_files() |
| 52 |
self.interactor = Interactor(None) |
| 53 |
self.top = self.CreateMainWindow() |
| 54 |
self.SetTopWindow(self.top) |
| 55 |
if self.splash is None: |
| 56 |
self.ShowMainWindow() |
| 57 |
self.session = None |
| 58 |
self.create_session() |
| 59 |
return true |
| 60 |
|
| 61 |
def OnExit(self): |
| 62 |
"""Clean up code. |
| 63 |
|
| 64 |
Extend this in derived classes if needed. |
| 65 |
""" |
| 66 |
self.session.Destroy() |
| 67 |
self.interactor.Destroy() |
| 68 |
Publisher.Destroy(self) |
| 69 |
|
| 70 |
def MainLoop(self): |
| 71 |
"""Call the inherited MainLoop method and then call OnExit. |
| 72 |
|
| 73 |
In wxPython OnExit isn't called automatically, unfortunately, so |
| 74 |
we do it here. |
| 75 |
""" |
| 76 |
wxApp.MainLoop(self) |
| 77 |
self.OnExit() |
| 78 |
|
| 79 |
def read_startup_files(self): |
| 80 |
"""Read the startup files.""" |
| 81 |
# for now the startup file is ~/.thuban/thubanstart.py |
| 82 |
dir =os.path.expanduser("~/.thuban") |
| 83 |
if os.path.isdir(dir): |
| 84 |
sys.path.append(dir) |
| 85 |
try: |
| 86 |
import thubanstart |
| 87 |
except ImportError: |
| 88 |
tb = sys.exc_info()[2] |
| 89 |
try: |
| 90 |
if tb.tb_next is not None: |
| 91 |
# The ImportError exception was raised from |
| 92 |
# inside the thubanstart module. |
| 93 |
sys.stderr.write(_("Cannot import the thubanstart" |
| 94 |
"module\n")) |
| 95 |
traceback.print_exc(None, sys.stderr) |
| 96 |
else: |
| 97 |
# There's no thubanstart module. |
| 98 |
sys.stderr.write(_("No thubanstart module available\n")) |
| 99 |
finally: |
| 100 |
# make sure we delete the traceback object, |
| 101 |
# otherwise there's be circular references involving |
| 102 |
# the current stack frame |
| 103 |
del tb |
| 104 |
except: |
| 105 |
sys.stderr.write(_("Cannot import the thubanstart module\n")) |
| 106 |
traceback.print_exc(None, sys.stderr) |
| 107 |
else: |
| 108 |
# There's no .thuban directory |
| 109 |
sys.stderr.write(_("No ~/.thuban directory\n")) |
| 110 |
|
| 111 |
def splash_screen(self): |
| 112 |
"""Create and return a splash screen. |
| 113 |
|
| 114 |
This method is called by OnInit to determine whether the |
| 115 |
application should have a splashscreen. If the application |
| 116 |
should display a splash screen override this method in a derived |
| 117 |
class and have it create and return the wxSplashScreen instance. |
| 118 |
The implementation of this method in the derived class should |
| 119 |
also arranged for ShowMainWindow to be called. |
| 120 |
|
| 121 |
The default implementation simply returns None so that no splash |
| 122 |
screen is shown and ShowMainWindow will be called automatically. |
| 123 |
""" |
| 124 |
return None |
| 125 |
|
| 126 |
def ShowMainWindow(self): |
| 127 |
"""Show the main window |
| 128 |
|
| 129 |
Normally this method is automatically called by OnInit to show |
| 130 |
the main window. However, if the splash_screen method has |
| 131 |
returned a splashscreen it is expected that the derived class |
| 132 |
also arranges for ShowMainWindow to be called at the appropriate |
| 133 |
time. |
| 134 |
""" |
| 135 |
self.top.Show(true) |
| 136 |
|
| 137 |
def CreateMainWindow(self): |
| 138 |
"""Create and return the main window for the application. |
| 139 |
|
| 140 |
Override this in subclasses to instantiate the Thuban mainwindow |
| 141 |
with different parameters or to use a different class for the |
| 142 |
main window. |
| 143 |
|
| 144 |
when this method is called by OnInit self.interactor (to be used |
| 145 |
for the interactor argument of the standard Thuban main window |
| 146 |
class) has already been instantiated. |
| 147 |
""" |
| 148 |
msg = (_("This is the wxPython-based Graphical User Interface" |
| 149 |
" for exploring geographic data")) |
| 150 |
return mainwindow.MainWindow(NULL, -1, "Thuban", self, self.interactor, |
| 151 |
initial_message = msg) |
| 152 |
|
| 153 |
def Session(self): |
| 154 |
"""Return the application's session object""" |
| 155 |
return self.session |
| 156 |
|
| 157 |
def SetSession(self, session): |
| 158 |
"""Make session the new session. |
| 159 |
|
| 160 |
Issue SESSION_REPLACED after self.session has become the new |
| 161 |
session. After the session has been assigned call |
| 162 |
self.subscribe_session() with the new session and |
| 163 |
self.unsubscribe_session with the old one. |
| 164 |
""" |
| 165 |
oldsession = self.session |
| 166 |
self.session = session |
| 167 |
self.subscribe_session(self.session) |
| 168 |
self.issue(SESSION_REPLACED) |
| 169 |
self.interactor.SetSession(session) |
| 170 |
self.maps_changed() |
| 171 |
if oldsession is not None: |
| 172 |
self.unsubscribe_session(oldsession) |
| 173 |
oldsession.Destroy() |
| 174 |
|
| 175 |
def subscribe_session(self, session): |
| 176 |
"""Subscribe to some of the sessions channels. |
| 177 |
|
| 178 |
Extend this method in derived classes if you need additional |
| 179 |
channels. |
| 180 |
""" |
| 181 |
session.Subscribe(MAPS_CHANGED, self.maps_changed) |
| 182 |
|
| 183 |
def unsubscribe_session(self, session): |
| 184 |
"""Unsubscribe from the sessions channels. |
| 185 |
|
| 186 |
Extend this method in derived classes if you subscribed to |
| 187 |
additional channels in subscribe_session(). |
| 188 |
""" |
| 189 |
session.Unsubscribe(MAPS_CHANGED, self.maps_changed) |
| 190 |
|
| 191 |
def create_session(self): |
| 192 |
"""Create a default session. |
| 193 |
|
| 194 |
Override this method in derived classes to instantiate the |
| 195 |
session differently or to use a different session class. Don't |
| 196 |
subscribe to channels here yet. Do that in the |
| 197 |
subscribe_session() method. |
| 198 |
""" |
| 199 |
self.SetSession(create_empty_session()) |
| 200 |
|
| 201 |
def OpenSession(self, filename): |
| 202 |
session = load_session(filename) |
| 203 |
session.SetFilename(filename) |
| 204 |
session.UnsetModified() |
| 205 |
self.SetSession(session) |
| 206 |
|
| 207 |
def SaveSession(self): |
| 208 |
save_session(self.session, self.session.filename) |
| 209 |
|
| 210 |
def maps_changed(self, *args): |
| 211 |
if self.session.HasMaps(): |
| 212 |
self.top.SetMap(self.session.Maps()[0]) |
| 213 |
else: |
| 214 |
self.top.SetMap(None) |
Parent Directory
| 
Revision Log