PyQt6 / Confusion over enum and flags

[John F Sturtz]

Argh!  Thank you.  I had a hunch this was going to turn out to be a dumb 
question when I posted it, and sure enough ... I guess it was late and I 
was bleary-eyed when I was messing around with it.

I assumed the problem was with the first argument, because that was 
(partly) what the error message said:

Traceback (most recent call last):
   File "<pyshell#4>", line 1, in <module>
     QKeyCombination(Qt.KeyboardModifier.ControlModifier, key=65)
TypeError: arguments did not match any overloaded call:
   QKeyCombination(key: Qt.Key = Qt.Key_unknown): argument 1 has 
unexpected type 'KeyboardModifier'
   QKeyCombination(modifiers: Qt.Modifier, key: Qt.Key = Qt.Key_unknown): 
argument 1 has unexpected type 'KeyboardModifier'
   QKeyCombination(modifiers: Qt.KeyboardModifier, key: Qt.Key = 
Qt.Key_unknown): argument 'key' has unexpected type 'int'
   QKeyCombination(a0: QKeyCombination): argument 1 has unexpected type 
'KeyboardModifier'

I see now that that part of the error message refers to the prototype 
with only one argument, which isn't the one I was trying to use.  The 
message I should have been looking at was the third one down, and then I 
would have seen the mistake you pointed out to me.  😖

Thanks again.  (Now slinking off with my tail between my legs ...)

/John


------ Original Message ------
>From "Charles" <peacech at gmail.com>
To "John F Sturtz" <john at sturtz.org>
Cc pyqt at riverbankcomputing.com
Date 12/17/2024 11:57:53 PM
Subject Re: PyQt6 / Confusion over enum and flags

> > QKeyCombination(Qt.KeyboardModifier.ControlModifier, key=65)
>
>You can't pass integer for enum, either use
>
>QKeyCombination(Qt.KeyboardModifier.ControlModifier, key=Qt.Key.Key_A)
>
>or
>
>QKeyCombination(Qt.KeyboardModifier.ControlModifier, key=Qt.Key(65))
>
>On Wed, Dec 18, 2024 at 12:38 PM John F Sturtz <john at sturtz.org> wrote:
>>Hi again.
>>
>>I am trying to port some PyQt5 code to PyQt6, and am running into 
>>confusion using the Qt.KeyboardModifierenum objects.  I think (hope) 
>>the answer to this question would probably enlighten me more generally 
>>as to what I'm misunderstanding:
>>
>>Suppose I want to manually construct a QKeyCombination object.  This:
>>
>>     QKeyCombination(Qt.KeyboardModifier.ControlModifier, key=65)
>>
>>fails, telling me that argument 1 has unexpected type 
>>'KeyboardModifier'.
>>
>>Indeed the Qt documentation for QKeyCombination says that argument 1 
>>should be of type Qt::KeyboardModifiers (plural).  And that the type 
>>of Qt::KeyboardModifier is enum, and that of Qt::KeyboardModifiers 
>>(plural) is flags.
>>
>>It also says 'The KeyboardModifiers type is a typedef for 
>>QFlags<KeyboardModifier>. It stores an OR combination of 
>>KeyboardModifier values.'
>>
>>I think I understand (on some level) that the concept of QFlags in Qt 
>>is not used in PyQt (anyway, I can't find anything called QFlags in 
>>PyQt).  But then I'm beating my head against the wall trying to figure 
>>out:  What does the QKeyCombination constructor want for its first 
>>argument?
>>
>>The PySide6 documentation for QKeyCombination (unhelpfully) says:
>>>__init__(modifiers[, key=Qt.Key_unknown])
>>>
>>>     Parameters:
>>>             modifiers – Combination of KeyboardModifier
>>>             key – Key
>>
>>What sort of 'combination'?  In what way do I combine KeyboardModifier 
>>objects so as to satisfy QKeyCombination's demand for an object of 
>>type KeyboardModifiers (plural) as the first argument?
>>
>>Thanks again!
>>
>>/John
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