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"""
***************************************************************************
qgstaskwrapper.py
---------------------
Date : May 2018
Copyright : (C) 2018 by Denis Rouzaud
Email : denis@opengis.ch
***************************************************************************
* *
* 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. *
* *
***************************************************************************
"""
from qgis._core import QgsTask
class QgsTaskWrapper(QgsTask):
def __init__(self, description, flags, function, on_finished, *args, **kwargs):
QgsTask.__init__(self, description, flags)
self.args = args
self.kwargs = kwargs
self.function = function
self.on_finished = on_finished
self.returned_values = None
self.exception = None
def run(self):
try:
self.returned_values = self.function(self, *self.args, **self.kwargs)
except Exception as ex:
# report error
self.exception = ex
return False
return True
def finished(self, result):
if not self.on_finished:
return
if not result and self.exception is None:
self.exception = Exception("Task canceled")
try:
if self.returned_values:
self.on_finished(self.exception, self.returned_values)
else:
self.on_finished(self.exception)
except Exception as ex:
self.exception = ex
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