QSpinbox in QWizardPage gets initial focus even if its focus-policy is set to NoFocus - pyqt5

Question

I create a QSpinBox in a QWizardPage. It get focus at the start of the wizardpage even when I set the focusPolicy to Qt.Nofocus.
What I set in Qt creator is:
But When the wizardpage start, I got:
Then, if I press Tab for several times, the focus will move between Finish and Cancel as expected.
I am using PyQt 5.15.6 on Windows 10. My python codes consists of a WizardPage.py file generated by pyuic5 and a test_wizard.py file.
WizardPage.py file :
# -*- coding: utf-8 -*-
# Form implementation generated from reading ui file 'wizardpage.ui'
#
# Created by: PyQt5 UI code generator 5.15.6
#
# WARNING: Any manual changes made to this file will be lost when pyuic5 is
# run again. Do not edit this file unless you know what you are doing.
from PyQt5 import QtCore, QtGui, QtWidgets
class Ui_WizardPage(object):
def setupUi(self, WizardPage):
WizardPage.setObjectName("WizardPage")
WizardPage.resize(400, 300)
self.spinBox = QtWidgets.QSpinBox(WizardPage)
self.spinBox.setGeometry(QtCore.QRect(40, 50, 42, 22))
self.spinBox.setFocusPolicy(QtCore.Qt.NoFocus)
self.spinBox.setObjectName("spinBox")
self.retranslateUi(WizardPage)
QtCore.QMetaObject.connectSlotsByName(WizardPage)
def retranslateUi(self, WizardPage):
_translate = QtCore.QCoreApplication.translate
WizardPage.setWindowTitle(_translate("WizardPage", "WizardPage"))
test_wizard.py file:
from PyQt5 import QtCore, QtGui, QtWidgets
from WizardPage import *
from PyQt5.Qt import *
from PyQt5.QtCore import *
import sys
class test_wizard_page(QtWidgets.QWizardPage, Ui_WizardPage):
def __init__(self, parent):
super().__init__(parent)
self.setupUi(self)
class MyWizard(QtWidgets.QWizard):
def __init__(self):
super().__init__()
self.test_wizard_page = test_wizard_page(self)
# self.test_wizard_page.setE
self.addPage(self.test_wizard_page)
if __name__ == "__main__":
app = QApplication(sys.argv)
wizard = MyWizard()
wizard.show()
sys.exit(app.exec_())
And .ui file I create using the Qt Creator:
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>WizardPage</class>
<widget class="QWizardPage" name="WizardPage">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>400</width>
<height>300</height>
</rect>
</property>
<property name="windowTitle">
<string>WizardPage</string>
</property>
<widget class="QSpinBox" name="spinBox">
<property name="geometry">
<rect>
<x>40</x>
<y>50</y>
<width>42</width>
<height>22</height>
</rect>
</property>
<property name="focusPolicy">
<enum>Qt::NoFocus</enum>
</property>
</widget>
</widget>
<resources/>
<connections/>
</ui>
This question may be related to my question. I also tried to reproduce their problem but fails with PyQt I currently uses. Is my question also a bug of Qt? And how can deal with this?

Answer 1

I can reproduce the behaviour, and it is still present in PyQt6. A work-around is to set the focus-policy on the line-edit of the spin-box (it isn't necessary to set it on spin-box as well). If you also want to restore the normal focus behaviour, it can be done using a single-shot timer:
class test_wizard_page(QtWidgets.QWizardPage, Ui_WizardPage):
def __init__(self, parent):
super().__init__(parent)
self.setupUi(self)
for spinbox in self.findChildren(QtWidgets.QSpinBox):
edit = spinbox.lineEdit()
policy = edit.focusPolicy()
edit.setFocusPolicy(QtCore.Qt.NoFocus)
QtCore.QTimer.singleShot(
0, lambda edit=edit, policy=policy:
edit.setFocusPolicy(policy))