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"""
***************************************************************************
contextmanagers.py
---------------------
Date : May 2014
Copyright : (C) 2014 by Nathan Woodrow
Email : woodrow dot nathan at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************
"""
__author__ = "Nathan Woodrow"
__date__ = "May 2014"
__copyright__ = "(C) 2014, Nathan Woodrow"
import sys
from contextlib import contextmanager
from qgis.core import QgsApplication
@contextmanager
def qgisapp(args=None, guienabled=True, configpath=None, sysexit=True):
"""
Create a new QGIS Qt application.
You should use this before creating any Qt widgets or QGIS objects for
your custom QGIS based application.
usage:
from qgis.core.contextmanagers import qgisapp
def main(app):
# Run your main code block
with qgisapp(sys.argv) as app:
main(app)
args - args passed to the underlying QApplication.
guienabled - True by default will create a QApplication with a GUI. Pass
False if you wish to create no GUI based app, e.g a server app.
configpath - Custom config path QGIS will use to load settings.
sysexit - Call sys.exit on app exit. True by default.
"""
if not args:
args = []
app = QgsApplication(args, guienabled, configpath)
QgsApplication.initQgis()
yield app
if guienabled:
exitcode = app.exec()
else:
exitcode = 0
QgsApplication.exitQgis()
if sysexit:
sys.exit(exitcode)
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