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PyQt5 signals and slots Graphical applications (GUI) are event-driven, unlike console or terminal applications. A users action like clicks a button or selecting an item in a list is called an event. If an event takes place, each PyQt5 widget can emit a signal. PyQt4 has a unique signal and slot mechanism to deal with events. Signals and slots are used for communication between objects. A signal is emitted when a particular event occurs. A slot can be any Python callable. Qt Signals And Slots Across Threads If you have heard stories of 'rigged casinos' then you have almost certainly heard of some of the smaller casinos that have been exposed. The top sites are regulated by online watchdogs like eCOGRA and by our own independent analysts and their RNGs (random number generators) are frequently checked.
28 Aug 2011 Matteo Mattei pythonpysideqtthreadPyqt Signals And Slots Across Threads Onto
In these days I started studying PySide. After some days spent in reading lot of stuff, I thought that a real example could be useful for who intends to start learning PySide as well. In this example I can show you how you can implement a custom signal (MySignal) together with the usage of threads with QThread.
.png "Pyqt signals and slots across threads game")
The following code creates a window with two buttons: the first starts and stop a thread (MyThread) that runs a batch that prints a point in the stdout every seconds continuously. The second button lets you only start another thread (MyLongThread) that prints an asterisk in the stdout every second for 10 seconds.
This example uses the api version 2 (introduced with PyQt 4.5) to connect signals to slots.
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For more information you can look at:
- QThread documentation: http://doc.qt.nokia.com/latest/qthread.html
- PySide signals and slots: http://developer.qt.nokia.com/wiki/Signals_and_Slots_in_PySide
- PyQt api 2 on PySide: http://www.pyside.org/docs/pseps/psep-0101.html
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