diff options
Diffstat (limited to 'examples/widgets/threads/thread_signals.py')
-rw-r--r-- | examples/widgets/threads/thread_signals.py | 100 |
1 files changed, 100 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..d63040491 --- /dev/null +++ b/examples/widgets/threads/thread_signals.py @@ -0,0 +1,100 @@ + +############################################################################# +## +## Copyright (C) 2020 The Qt Company Ltd. +## Contact: https://www.qt.io/licensing/ +## +## This file is part of the Qt for Python examples of the Qt Toolkit. +## +## $QT_BEGIN_LICENSE:BSD$ +## You may use this file under the terms of the BSD license as follows: +## +## "Redistribution and use in source and binary forms, with or without +## modification, are permitted provided that the following conditions are +## met: +## * Redistributions of source code must retain the above copyright +## notice, this list of conditions and the following disclaimer. +## * Redistributions in binary form must reproduce the above copyright +## notice, this list of conditions and the following disclaimer in +## the documentation and/or other materials provided with the +## distribution. +## * Neither the name of The Qt Company Ltd nor the names of its +## contributors may be used to endorse or promote products derived +## from this software without specific prior written permission. +## +## +## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +## +## $QT_END_LICENSE$ +## +############################################################################# + +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_()) |