how to execute a QCombobox Pyqt6 cursor output method

Jbone73

Hello everybody,

I would like to execute a method when I lose the cursor in a QCombobox with Pyqt6.

I've looked on several forums but can't find any help on my topic.

Thank you all in advance for your help.

jsulm

@Jbone73 said in how to execute a QCombobox Pyqt6 cursor output method:

QCombobox

Subclass it and override https://doc.qt.io/qt-5/qwidget.html#focusOutEvent

Jbone73

Thanks jsulm for your help,

I looked at the event handler you linked, I tried the method but the syntax is not good.

QComboBox.focusOutEvent(QFocusEvent.lostFocus(self))

Do you have any idea?

Thank you in advance.

JonB

@Jbone73
As @jsulm said, you need to subclass QComboBox and override the QComboBox.focusOutEvent() method in Python, just as you would have to do in C++.

Jbone73

Hello everybody,

I'm sorry for my delay, I tested jsulm's post and followed the instructions. It works but I have a little presentation problem. The combobox cursor does not delete itself and I end up with another cursor on the other fields.

My code :

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        
        frame = QtWidgets.QFrame(self)
        qc == ComboBox(frame)
        qc.focusOutEvent()

class ComboBox(QComboBox):

    def focusOutEvent(self, event=QFocusEvent):
        pass

Do you have any idea about this problem?

Thank you in advance.

jsulm

@Jbone73 said in how to execute a QCombobox Pyqt6 cursor output method:

Do you have any idea about this problem?

Yes, you should also call the base class focusOutEvent in your focusOutEvent implementation.

Jbone73

@jsulm

Agreed ! Thank you ! I'm new to Qt and Python, I must admit I had a hard time understanding what you're asking to do.

Do I have to call the QFocusEvent class in the QCombobox class?

I'm sorry to ask so many questions but this is really new to me.

Thank you in advance.

jsulm

@Jbone73

class ComboBox(QComboBox):
    def focusOutEvent(self, event=QFocusEvent):
        super().focusOutEvent(event)

Jbone73

@jsulm
Thank you (sorry! I keep telling you but help is always useful, especially when you're just starting out), so I tried but I have a problem with the focusOutEvent method, which I can't seem to figure out the meaning of or event = QFocusEvent.

The error is:
TypeError: focusOutEvent(self, QFocusEvent): argument 1 has unexpected type 'PyQt6.sip.wrappertype'

Thank you for everything and if you don't mind and if it's not too long, would you be able to explain to me? I admit that I swim a little.

jsulm

@Jbone73 Please show the code causing this error

Jbone73

@jsulm
This is the one you shared with me, I note it below:

class ComboBox(QComboBox):
    def focusOutEvent(self, event=QFocusEvent):
        super().focusOutEvent(event)

JonB

@Jbone73
Only a guess, depends what you have imported how, QFocusEvent might not be defined, you might need QtGui.QFocusEvent.

Jbone73

@JonB

Hello JonB, thank you for your answer.

I just looked and QFocusEvent is present in QtGui.

I don't see why he is marking this message for me.

from PyQt6.QtGui import QIcon, QPixmap, QIntValidator, QFocusEvent

SGaist

Hi,

@Jbone73 said in how to execute a QCombobox Pyqt6 cursor output method:

@jsulm
This is the one you shared with me, I note it below:
class ComboBox(QComboBox):
    def focusOutEvent(self, event=QFocusEvent):
        super().focusOutEvent(event)

What about ?

class ComboBox(QComboBox):
     def focusOutEvent(self, event):
         super().focusOutEvent(event)

If you want type hints:

class ComboBox(QComboBox):
     def focusOutEvent(self, event: QFocusEvent) -> None:
         super().focusOutEvent(event)

Jbone73

@SGaist
Hello !
I don't understand ??

If I use your code :

class ComboBox(QComboBox):
     def focusOutEvent(self, event: QFocusEvent) -> None:
         super().focusOutEvent(event)

Or

class ComboBox(QComboBox):
     def focusOutEvent(self, event):
         super().focusOutEvent(event)

I have messages of errors and it does not work, on the other hand, if I put:

class ComboBox(QComboBox):

    def focusOutEvent(self, event=QFocusEvent):
        print('ok')

I do not have problem anymore, it works but not correctly.
The cursor of the combobox remains active when it takes the focus and I meet with another focus on other Widgets.

I do not understand why this does not work correctly???

SGaist

Can you provide a minimal complete script to reproduce this behaviour ?