[PyQt] Fwd: Re: disconnect all slots in QObject

[Baz Walter]

-------- Forwarded Message --------
Subject: Re: [PyQt] disconnect all slots in QObject
Date: Fri, 11 Nov 2016 02:29:59 +0000
From: oliver <oliver.schoenborn at gmail.com>
To: Baz Walter <bazwal at ftml.net>

Thanks for your reply. However these 2 capabilities, although useful, are
not the same as asking how to do "emitter.disconnect(receiver)" which in
C++ would automatically loop over all signals of emitter, and for each one,
would call disconnect(receiver). I suppose I could create a helper function
that does this, using the metaObject().method(i) with type=Signal, but
since this is in Qt I thought there was a good chance I'd be
re-implementing the wheel in PyQt, but that's not the case from what you
are saying.
Oliver

On Thu, 10 Nov 2016 at 21:17 Baz Walter <bazwal at ftml.net> wrote:

> On 11/11/16 00:06, oliver wrote:
> > The Qt docs at http://doc.qt.io/qt-5/qobject.html#disconnect-2 suggest
> that
> > it is possible to disconnect all signals of an emitter from all slots of
> a
> > specific receiver (because the method name can be null). In Python, the
> > following should therefore work, but it doesn't:
> >
> > from PyQt5.QtCore import QObject, pyqtSignal
> >
> > class Foo(QObject):
> >     def slot1(self):
> >         print('slot1')
> >
> > class Emitter(QObject):
> >     sig_test = pyqtSignal()
> >
> > foo = Foo()
> > emitter = Emitter()
> > con = emitter.sig_test.connect(foo.slot1)
> > emitter.disconnect(foo)  # TypeError: too many arguments
> >
> > QObject.disconnect() takes no arguments. Is the equivalent functionality
> > somewhere else in PyQt? Also, the C++ docs indicate that connecting a
> > signal to a slot returns a QMetaObject::Connection object; nothing is
> > returned from connect(), so same question there.
>
> PyQt5 has it's own syntax for connecting signals, so much of the C++ API
> documentation on that topic is not relevant.
>
> The main exception is the no-argument overload of QObject.disconnect(),
> which disconnects *all* the signals of an object.
>
> Otherwise, the equivalent functionality is to be found on the bound pyqt
> signal object itself. So to disconnect all slots from a specific signal,
> you would do this:
>
>      emitter.sig_test.disconnect()
>
> and to disconnect a specific slot from a signal:
>
>      emitter.sig_test.disconnect(foo.slot1)
>
> If you want more details, read this:
>
>      http://pyqt.sourceforge.net/Docs/PyQt5/signals_slots.html
>
> --
> Regards
> Baz Walter
>
-- 
Oliver