PySide QtCore QEventLoop is a class in the PySide library that provides a simple event loop for PyQt/PySide applications. An event loop is a programming structure that lets an application wait for events, such as user input or system messages, and act on them as they occur. The QEventLoop class allows you to create an event loop for your application and run it until a given exit condition is met.
Example 1: In this example, we create a QEventLoop object and run it until a signal is emitted. The event loop exits when the signal is received.
import sys from PySide.QtCore import QObject, QEventLoop, QTimer, Signal, Slot
This example demonstrates how to use the QEventLoop to wait for a signal to be emitted and then exit the loop. We create an EventLoop object and connect its `signal` to the loop's `quit` slot. We then use two QTimer objects to emit the `signal` and call `some_slot()` after a certain delay. The event loop executes until the signal is received and the loop is quit.
Example 2: In this example, we create a QEventLoop object and run it until a condition is met. We use a QTimer to simulate a long-running task, and then we exit the loop when the task is complete.
import sys from PySide.QtCore import QEventLoop, QTimer
if __name__ == "__main__": app = QApplication(sys.argv) event_loop = QEventLoop()
This example demonstrates how to use the QEventLoop to run a long-running task and then exit the loop when the task is complete. We create a QEventLoop object and use a QTimer to simulate a 5-second task. When the task completes, we call `event_loop.exit()` to force the loop to quit.
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