# https://www.pythonguis.com/tutorials/multithreading-pyside-applications-qthreadpool/
import sys
import traceback
from PySide6.QtCore import QObject, QRunnable, Signal, Slot
[docs]
class WorkerSignals(QObject):
"""
Defines the signals available from a running worker thread.
Supported signals are:
finished
No data
error
tuple (exctype, value, traceback.format_exc() )
result
object data returned from processing, anything
progress
int indicating % progress
"""
finished = Signal()
error = Signal(tuple)
result = Signal(object)
progress = Signal(object, object)
[docs]
class Worker(QRunnable):
"""
Worker thread
Inherits from QRunnable to handler worker thread setup, signals and wrap-up.
:param callback: The function callback to run on this worker thread. Supplied args and
kwargs will be passed through to the runner.
:type callback: function
:param args: Arguments to pass to the callback function
:param kwargs: Keywords to pass to the callback function
"""
def __init__(self, fn, *args, **kwargs):
super(Worker, self).__init__()
# Store constructor arguments (re-used for processing)
self.fn = fn
self.args = args
self.kwargs = kwargs
self.signals = WorkerSignals()
# Add the callback to our kwargs
self.kwargs["progress_callback"] = self.signals.progress
[docs]
@Slot()
def run(self):
"""
Initialise the runner function with passed args, kwargs.
"""
# Retrieve args/kwargs here; and fire processing using them
try:
result = self.fn(*self.args, **self.kwargs)
except: # noqa: E722
traceback.print_exc()
exctype, value = sys.exc_info()[:2]
self.signals.error.emit((exctype, value, traceback.format_exc()))
else:
self.signals.result.emit(result) # Return the result of the processing
finally:
self.signals.finished.emit() # Done