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# Copyright (C) 2001, 2002, 2003 by Intevation GmbH |
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# Authors: |
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# Jan-Oliver Wagner <[email protected]> |
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# Bernhard Herzog <[email protected]> |
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# |
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# This program is free software under the GPL (>=v2) |
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# Read the file COPYING coming with Thuban for details. |
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|
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""" |
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Thuban's application object. |
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""" |
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|
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__version__ = "$Revision$" |
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|
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import sys, os |
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import os.path |
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|
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import traceback |
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|
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from wxPython.wx import * |
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from wxPython.lib.dialogs import wxScrolledMessageDialog |
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|
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from Thuban.Lib.connector import Publisher |
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from Thuban.Lib.fileutil import get_application_dir |
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|
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from Thuban import _ |
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from Thuban.Model.session import create_empty_session |
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from Thuban.Model.save import save_session |
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from Thuban.Model.load import load_session |
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from Thuban.Model.messages import MAPS_CHANGED |
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from Thuban.Model.layer import RasterLayer |
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import Thuban.Model.resource |
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|
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import view |
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import tree |
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import mainwindow |
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|
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from messages import SESSION_REPLACED |
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|
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|
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class ThubanApplication(wxApp, Publisher): |
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|
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""" |
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Thuban's application class. |
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|
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All wxWindows programs have to have an instance of an application |
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class derived from wxApp. In Thuban the application class holds |
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references to the main window and the session. |
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""" |
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|
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def OnInit(self): |
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sys.excepthook = self.ShowExceptionDialog |
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self.splash = self.splash_screen() |
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if self.splash is not None: |
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self.splash.Show() |
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self.read_startup_files() |
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self.top = self.CreateMainWindow() |
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self.SetTopWindow(self.top) |
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if self.splash is None: |
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self.ShowMainWindow() |
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self.session = None |
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self.create_session() |
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return True |
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|
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def OnExit(self): |
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"""Clean up code. |
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|
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Extend this in derived classes if needed. |
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""" |
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self.session.Destroy() |
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self.session = None |
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Publisher.Destroy(self) |
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|
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def read_startup_files(self): |
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"""Read the startup files.""" |
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# for now the startup file is ~/.thuban/thubanstart.py |
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dir = get_application_dir() |
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if os.path.isdir(dir): |
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sys.path.append(dir) |
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try: |
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import thubanstart |
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except ImportError: |
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tb = sys.exc_info()[2] |
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try: |
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if tb.tb_next is not None: |
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# The ImportError exception was raised from |
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# inside the thubanstart module. |
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sys.stderr.write(_("Cannot import the thubanstart" |
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" module\n")) |
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traceback.print_exc(None, sys.stderr) |
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else: |
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# There's no thubanstart module. |
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sys.stderr.write(_("No thubanstart module available\n")) |
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finally: |
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# make sure we delete the traceback object, |
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# otherwise there's be circular references involving |
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# the current stack frame |
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del tb |
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except: |
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sys.stderr.write(_("Cannot import the thubanstart module\n")) |
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traceback.print_exc(None, sys.stderr) |
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else: |
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# There's no .thuban directory |
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sys.stderr.write(_("No ~/.thuban directory\n")) |
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|
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def splash_screen(self): |
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"""Create and return a splash screen. |
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|
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This method is called by OnInit to determine whether the |
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application should have a splashscreen. If the application |
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should display a splash screen override this method in a derived |
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class and have it create and return the wxSplashScreen instance. |
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The implementation of this method in the derived class should |
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also arranged for ShowMainWindow to be called. |
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|
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The default implementation simply returns None so that no splash |
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screen is shown and ShowMainWindow will be called automatically. |
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""" |
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return None |
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|
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def ShowMainWindow(self): |
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"""Show the main window |
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|
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Normally this method is automatically called by OnInit to show |
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the main window. However, if the splash_screen method has |
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returned a splashscreen it is expected that the derived class |
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also arranges for ShowMainWindow to be called at the appropriate |
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time. |
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""" |
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self.top.Show(True) |
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|
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def CreateMainWindow(self): |
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"""Create and return the main window for the application. |
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Override this in subclasses to instantiate the Thuban mainwindow |
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with different parameters or to use a different class for the |
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main window. |
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""" |
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msg = (_("This is the wxPython-based Graphical User Interface" |
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" for exploring geographic data")) |
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return mainwindow.MainWindow(NULL, -1, "Thuban", self, None, |
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initial_message = msg, |
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size = (600, 400)) |
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|
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def Session(self): |
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"""Return the application's session object""" |
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return self.session |
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|
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def SetSession(self, session): |
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"""Make session the new session. |
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|
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Issue SESSION_REPLACED after self.session has become the new |
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session. After the session has been assigned call |
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self.subscribe_session() with the new session and |
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self.unsubscribe_session with the old one. |
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""" |
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oldsession = self.session |
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self.session = session |
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self.subscribe_session(self.session) |
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self.issue(SESSION_REPLACED) |
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self.maps_changed() |
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if oldsession is not None: |
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self.unsubscribe_session(oldsession) |
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oldsession.Destroy() |
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|
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def subscribe_session(self, session): |
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"""Subscribe to some of the sessions channels. |
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|
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Extend this method in derived classes if you need additional |
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channels. |
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""" |
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session.Subscribe(MAPS_CHANGED, self.maps_changed) |
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|
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def unsubscribe_session(self, session): |
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"""Unsubscribe from the sessions channels. |
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|
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Extend this method in derived classes if you subscribed to |
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additional channels in subscribe_session(). |
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""" |
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session.Unsubscribe(MAPS_CHANGED, self.maps_changed) |
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|
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def create_session(self): |
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"""Create a default session. |
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Override this method in derived classes to instantiate the |
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session differently or to use a different session class. Don't |
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subscribe to channels here yet. Do that in the |
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subscribe_session() method. |
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""" |
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self.SetSession(create_empty_session()) |
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|
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def OpenSession(self, filename): |
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"""Open the session in the file named filename""" |
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# Make sure we deal with an absolute pathname. Otherwise we can |
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# get problems when saving because the saving code expects an |
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# absolute directory name |
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filename = os.path.abspath(filename) |
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session = load_session(filename) |
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session.SetFilename(filename) |
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session.UnsetModified() |
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self.SetSession(session) |
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|
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for map in session.Maps(): |
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for layer in map.Layers(): |
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if isinstance(layer, RasterLayer) \ |
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and not Thuban.Model.resource.has_gdal_support(): |
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msg = _("The current session contains Image layers,\n" |
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"but the GDAL library is not available to " |
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"draw them.") |
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dlg = wx.wxMessageDialog(None, |
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msg, |
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_("Library not available"), |
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wx.wxOK | wx.wxICON_INFORMATION) |
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print msg |
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dlg.ShowModal() |
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dlg.Destroy() |
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break |
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|
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def SaveSession(self): |
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save_session(self.session, self.session.filename) |
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|
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def maps_changed(self, *args): |
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if self.session.HasMaps(): |
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self.top.SetMap(self.session.Maps()[0]) |
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else: |
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self.top.SetMap(None) |
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|
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in_exception_dialog = 0 # flag: are we already inside the exception dialog? |
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|
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def ShowExceptionDialog(self, exc_type, exc_value, exc_traceback): |
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"""Show a message box with information about an exception. |
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The parameters are the usual values describing an exception in |
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Python, the exception type, the value and the traceback. |
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|
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This method can be used as a value for the sys.excepthook. |
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""" |
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|
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if self.in_exception_dialog: |
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return |
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self.in_exception_dialog = 1 |
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while wxIsBusy(): |
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wxEndBusyCursor() # reset the mouse cursor |
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|
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try: |
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lines = traceback.format_exception(exc_type, exc_value, |
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exc_traceback) |
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message = "An unhandled exception occurred:\n%s\n" % exc_value+\ |
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"(please report to " \ |
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"http://thuban.intevation.org/bugtracker.html)"\ |
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"\n\n\n"+\ |
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"".join(lines) |
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print message |
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|
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# We don't use an explicit parent here because this method might |
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# be called in circumstances where the main window doesn't exist |
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# anymore. |
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dlg = wxScrolledMessageDialog(None, message, |
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"Thuban: Internal Error") |
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dlg.ShowModal() |
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dlg.Destroy() |
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|
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finally: |
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self.in_exception_dialog = 0 |
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# delete the last exception info that python keeps in |
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# sys.last_* because especially last_traceback keeps |
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# indirect references to all objects bound to local |
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# variables and this might prevent some object from being |
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# collected early enough. |
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sys.last_type = sys.last_value = sys.last_traceback = None |
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