Python Qt Slot Decorator 6,4/10 6017 reviews
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PyObject is passed as direct pointer, which allows to pass/return any Python object directly to/from a Qt slot that uses PyObject. as its argument/return value. All Qt QVariant types are implemented, PythonQt supports the complete Qt API for these objects. Qt for Python When Use @Slot, sender has NoneType. Please read the Qt Code of Conduct. Decorator because the @Slot decorator means its a catcher for a.

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Unlike a console mode application, which is executed in a sequential manner, a GUI based application is event driven. Functions or methods are executed in response to user’s actions like clicking on a button, selecting an item from a collection or a mouse click etc., called events.

Widgets used to build the GUI interface act as the source of such events. Each PyQt widget, which is derived from QObject class, is designed to emit ‘signal’ in response to one or more events. The signal on its own does not perform any action. Instead, it is ‘connected’ to a ‘slot’. The slot can be any callable Python function.

In PyQt, connection between a signal and a slot can be achieved in different ways. Following are most commonly used techniques −

A more convenient way to call a slot_function, when a signal is emitted by a widget is as follows −

Suppose if a function is to be called when a button is clicked. Here, the clicked signal is to be connected to a callable function. It can be achieved in any of the following two techniques −

or

Example

In the following example, two QPushButton objects (b1 and b2) are added in QDialog window. We want to call functions b1_clicked() and b2_clicked() on clicking b1 and b2 respectively.

When b1 is clicked, the clicked() signal is connected to b1_clicked() function

When b2 is clicked, the clicked() signal is connected to b2_clicked() function

Example

Python Qt Slot Decorator Machine

The above code produces the following output −

Output

Python Qt Slot Decorator Tool

Hi!

Python qt slot decorator rods

Is it possible to connect a python lambda or functools.partial as a PySide2 Slot? It is possible with the C++ version of Qt but it seems that it is recommended to always use slots that have been decorated in PySide2, as stated in the note here.

I would do that in order to pass different arguments to my slots depending on which signal was emitted (my slot is connected to different signals). If you know a better way to do that I am greatly interested but I would like an answer to the original question nonetheless.

Python Qt Slot Decorator Rods

Thanks a lot!