diff options
author | Alejandro Gutierrez <Aenswindstorm@gmail.com> | 2019-08-09 11:12:15 +0200 |
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committer | Cristián Maureira-Fredes <cristian.maureira-fredes@qt.io> | 2020-01-27 23:41:24 +0100 |
commit | 450086611ae9640a375b696f251c337e160cbfbf (patch) | |
tree | 92fb3f926a42cace772d457e316d0a8b7fb43cd2 | |
parent | 1f827cc1cba846eb2c6edacd2096469e4b0bc400 (diff) |
Add example for Threads and Signals
The goal of this file is to provide an example for signals being
emitted from one thread to another.
Task-number: PYSIDE-841
Change-Id: If494fbfef6d8c46b37d5b750163c909bc6c55c7a
Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>
-rw-r--r-- | examples/widgets/threads/thread_signals.py | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/examples/widgets/threads/thread_signals.py b/examples/widgets/threads/thread_signals.py new file mode 100644 index 000000000..e12fdcecf --- /dev/null +++ b/examples/widgets/threads/thread_signals.py @@ -0,0 +1,98 @@ +############################################################################# +## +## Copyright (C) 2020 The Qt Company Ltd. +## Contact: https://www.qt.io/licensing/ +## +## This file is part of the Qt for Python project. +## +## $QT_BEGIN_LICENSE:LGPL$ +## Commercial License Usage +## Licensees holding valid commercial Qt licenses may use this file in +## accordance with the commercial license agreement provided with the +## Software or, alternatively, in accordance with the terms contained in +## a written agreement between you and The Qt Company. For licensing terms +## and conditions see https://www.qt.io/terms-conditions. For further +## information use the contact form at https://www.qt.io/contact-us. +## +## GNU Lesser General Public License Usage +## Alternatively, this file may be used under the terms of the GNU Lesser +## General Public License version 3 as published by the Free Software +## Foundation and appearing in the file LICENSE.LGPL3 included in the +## packaging of this file. Please review the following information to +## ensure the GNU Lesser General Public License version 3 requirements +## will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +## +## GNU General Public License Usage +## Alternatively, this file may be used under the terms of the GNU +## General Public License version 2.0 or (at your option) the GNU General +## Public license version 3 or any later version approved by the KDE Free +## Qt Foundation. The licenses are as published by the Free Software +## Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +## included in the packaging of this file. Please review the following +## information to ensure the GNU General Public License requirements will +## be met: https://www.gnu.org/licenses/gpl-2.0.html and +## https://www.gnu.org/licenses/gpl-3.0.html. +## +## $QT_END_LICENSE$ +## +############################################################################# + +import sys +from PySide2.QtCore import QObject, QThread, Signal, Slot +from PySide2.QtWidgets import QApplication, QPushButton, QVBoxLayout, QWidget + + +# Create a basic window with a layout and a button +class MainForm(QWidget): + def __init__(self): + QWidget.__init__(self) + self.setWindowTitle("My Form") + self.layout = QVBoxLayout() + self.button = QPushButton("Click me!") + self.button.clicked.connect(self.start_thread) + self.layout.addWidget(self.button) + self.setLayout(self.layout) + + # Instantiate and start a new thread + def start_thread(self): + instanced_thread = WorkerThread(self) + instanced_thread.start() + + # Create the Slots that will receive signals + @Slot(str) + def update_str_field(self, message): + print(message) + + @Slot(int) + def update_int_field(self, value): + print(value) + + +# Signals must inherit QObject +class MySignals(QObject): + signal_str = Signal(str) + signal_int = Signal(int) + + +# Create the Worker Thread +class WorkerThread(QThread): + def __init__(self, parent=None): + QThread.__init__(self, parent) + # Instantiate signals and connect signals to the slots + self.signals = MySignals() + self.signals.signal_str.connect(parent.update_str_field) + self.signals.signal_int.connect(parent.update_int_field) + + def run(self): + # Do something on the worker thread + a = 1 + 1 + # Emit signals whenever you want + self.signals.signal_int.emit(a) + self.signals.signal_str.emit("This text comes to Main thread from our Worker thread.") + + +if __name__ == "__main__": + app = QApplication(sys.argv) + window = MainForm() + window.show() + sys.exit(app.exec_()) |