examples: Simplify minimal_asyncio

For historical reasons, the minimal asyncio example was unnecessarily
complicated (as it tried to follow the trio example's approach of an
AsyncHelper class). Simplify the code to make it more straightforward
and understandable.

Pick-to: 6.6
Task-number: PYSIDE-769
Change-Id: I376b73356f7e46f640db482a9e149f1a6fa54dd6
Reviewed-by: Christian Tismer <[email protected]>

1 files changed, 2 insertions, 24 deletions

diff --git a/examples/async/minimal/minimal_asyncio.py b/examples/async/minimal/minimal_asyncio.py
index 4545f35d5..1b72f44c1 100644
--- a/examples/async/minimal/minimal_asyncio.py
+++ b/examples/async/minimal/minimal_asyncio.py
@@ -1,7 +1,7 @@
 # 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.QtCore import Qt
 from PySide6.QtWidgets import (QApplication, QLabel, QMainWindow, QPushButton, QVBoxLayout, QWidget)
 
 import PySide6.QtAsyncio as QtAsyncio
@@ -12,8 +12,6 @@ import sys
 
 class MainWindow(QMainWindow):
 
-    start_signal = Signal()
-
     def __init__(self):
         super().__init__()
 
@@ -26,37 +24,17 @@ class MainWindow(QMainWindow):
         layout.addWidget(self.text, alignment=Qt.AlignmentFlag.AlignCenter)
 
         async_trigger = QPushButton(text="What is the question?")
-        async_trigger.clicked.connect(self.async_start)
+        async_trigger.clicked.connect(lambda: asyncio.ensure_future(self.set_text()))
         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()