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Signals slots python

I am writing my first Python app with PyQt4. I have a MainWindow and a Dialog class, which is a part of MainWindow class: CRAIGFAM.INFOialog = LoginDialog(); I use slots and signals. On the #pyqt channel on Freenode, Khertan asked about sending Python values via Qt's signals and slots mechanism. The following example uses the PyQt_PyObject value declaration with an old-style signal-slot connection, and again when the signal is emitted, to communicate a Python dictionary. Support for Signals and Slots A slot is a Python callable. If a signal is connected to a slot then the slot is called when the signal is emitted.

PyQt5 signals and slots

The output from the thread is presented in a QLabel instance, viewer. If it is omitted then all slots connected to the signal are disconnected. For instance, one event activates its slot and related subsequent events trigger another signal and the code in its slot to be executed. Their use encourages the development of reusable components. This additional check allows us to terminate the thread on demand by setting the exiting attribute to True at any time. The next argument is the signal we would like to emit, for example it could have been SIGNAL "myfirstsignal " if we wanted to emit a signal with that name. This may only be given as a keyword argument.

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Qt for Python Signals and Slots

Join Stack Overflow to learn, share knowledge, and build your career. I am writing my first Python app with PyQt4. Unfortunately, slot is not invoked. I tried with no arguments as well, different styles of emitting signal. No errors, no warnings in the code. What might be the problem? Signals must have the same signature. By the way, if you are defining your own signals, don't define parametres.

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Check, if this helps: Hence there are four cases to emits a signal to a slot:. Signal signature for Python signal differentiate from that of QT signal in that it doesn't have the parenthesis and can be passed any python data types when you emit it. The Python signal is created when you emit it. These points are made in Summerfield's article on Signals and Slots.

As Idan K suggested there is an alternative new-style to do the things, especially for the Python signal. Refer to here for more. I checked your code and it looks like the problem is in the way how you're connecting your signal. As noted by gruszczy you have to use the same QtCore.

Also I think you should use Qt types in the arguments list of signal function. I haven't used PyQT4 but take a look at here. By posting your answer, you agree to the privacy policy and terms of service.

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One of the key features of Qt is its use of signals and slots to communicate between objects. Their use encourages the development of reusable components. A signal is emitted when something of potential interest happens. A slot is a Python callable. If a signal is connected to a slot then the slot is called when the signal is emitted. The code or component that emits the signal does not know or care if the signal is being used. A signal specifically an unbound signal is an attribute of a class that is a sub-class of QObject.

When a signal is referenced as an attribute of an instance of the class then PyQt4 automatically binds the instance to the signal in order to create a bound signal.

This is the same mechanism that Python itself uses to create bound methods from class functions. A bound signal has connect , disconnect and emit methods that implement the associated functionality.

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A signal may be overloaded, ie. A signal may be indexed with a signature in order to select the one required. A signature is a sequence of types. New signals can be defined as class attributes using the pyqtSignal factory.

New signals should only be defined in sub-classes of QObject. They must be part of the class definition and cannot be dynamically added as class attributes after the class has been defined. The following is an example of this:. Signals are connected to slots using the connect method of a bound signal. Signals are disconnected from slots using the disconnect method of a bound signal. Disconnect one or more slots from a signal. An exception will be raised if the slot is not connected to the signal or if the signal has no connections at all.

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