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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from PySide6.QtCore import (Qt, QObject, Signal, Slot)
from PySide6.QtWidgets import (QApplication, QLabel, QMainWindow, QPushButton, QVBoxLayout, QWidget)
import PySide6.QtAsyncio as QtAsyncio
import asyncio
import sys
class MainWindow(QMainWindow):
start_signal = Signal()
def __init__(self):
super().__init__()
widget = QWidget()
self.setCentralWidget(widget)
layout = QVBoxLayout(widget)
self.text = QLabel("The answer is 42.")
layout.addWidget(self.text, alignment=Qt.AlignmentFlag.AlignCenter)
async_trigger = QPushButton(text="What is the question?")
async_trigger.clicked.connect(self.async_start)
layout.addWidget(async_trigger, alignment=Qt.AlignmentFlag.AlignCenter)
@Slot()
def async_start(self):
self.start_signal.emit()
async def set_text(self):
await asyncio.sleep(1)
self.text.setText("What do you get if you multiply six by nine?")
class AsyncHelper(QObject):
def __init__(self, worker, entry):
super().__init__()
self.entry = entry
self.worker = worker
if hasattr(self.worker, "start_signal") and isinstance(self.worker.start_signal, Signal):
self.worker.start_signal.connect(self.on_worker_started)
@Slot()
def on_worker_started(self):
asyncio.ensure_future(self.entry())
if __name__ == "__main__":
app = QApplication(sys.argv)
main_window = MainWindow()
async_helper = AsyncHelper(main_window, main_window.set_text)
main_window.show()
QtAsyncio.run()
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