CODEWITHSUNDEEP
pythonqtpyqt5qobject
dj K
dj K

Reputation: 300

PyQt5 support for signals in classes not inheriting from QObject

in the "Differences Between PyQt4 and PyQt5" section (http://pyqt.sourceforge.net/Docs/PyQt5/pyqt4_differences.html), I can read the following line:

Unlike PyQt4, PyQt5 supports the definition of properties, signals and slots in classes not sub-classed from QObject (i.e. in mixins).

However, in the "Support for Signals and Slots" section (http://pyqt.sourceforge.net/Docs/PyQt5/signals_slots.html), I can read:

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.

Am I misunderstanding something or the 2 sentences contradict each other?

Upvotes: 1

Views: 971

Answers (1)

The Compiler
The Compiler

Reputation: 11969

Note the in mixins part. It means you can do something like:

from PyQt5.QtCore import pyqtSignal, QObject

class SignalMixin:
    sig = pyqtSignal()

class Obj(SignalMixin, QObject):
    pass

o = Obj()
o.sig.connect(lambda: print('foo'))
o.sig.emit()

Upvotes: 2

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