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"""
Multithreading simple
=====================
.. tags:: interactivity
"""
import time
from qtpy.QtWidgets import QApplication, QHBoxLayout, QLabel, QWidget
from napari.qt import thread_worker
@thread_worker
def long_running_function():
"""Just a long running function, most like viewer.update."""
time.sleep(2) # long function
return 'finished!'
def create_widget():
widget = QWidget()
layout = QHBoxLayout()
widget.setLayout(layout)
widget.status = QLabel('ready...')
layout.addWidget(widget.status)
widget.show()
return widget
if __name__ == '__main__':
app = QApplication([])
wdg = create_widget()
# call decorated function
# By default, @thread_worker-decorated functions do not immediately start
worker = long_running_function()
# Signals are best connected *before* starting the worker.
worker.started.connect(lambda: wdg.status.setText('worker is running...'))
worker.returned.connect(lambda x: wdg.status.setText(f'returned {x}'))
# # Connections may also be passed directly to the decorated function.
# # The above syntax is equivalent to:
# worker = long_running_function(
# _connect={
# 'started': lambda: wdg.status.setText("worker is running..."),
# 'returned': lambda x: wdg.status.setText(f"returned {x!r}"),
# }
# )
worker.start()
app.exec_()
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