Pyside6 QWizard setFocus() not working

Erriez

I've a PIP PySide 6.4.1 QWizard application on Ubuntu 20.04 with two textboxes. Goal is to set focus on a QLineEdit named txt_edit2 by default, but the code below ignores line txt_edit2.setFocus() and sets focus on the first txt_edit1:

# Focus not working in QWizard!
from PySide6.QtWidgets import (QApplication, QWizard, QWizardPage, QLineEdit, QHBoxLayout)
import sys

class ClassInfoPage(QWizardPage):
    def __init__(self, parent=None):
        super().__init__(parent)

        txt_edit1 = QLineEdit('txt_edit1: Focused: wrong')
        txt_edit2 = QLineEdit('txt_edit2: Focus not set')

        layout = QHBoxLayout(self)
        layout.addWidget(txt_edit1)
        layout.addWidget(txt_edit2)

        # setFocus() line below is ignored! txt_edit1 is still the default
        txt_edit2.setFocus()


class MyWizard(QWizard):
    def __init__(self, parent=None):
        super().__init__(parent)

        self.setWindowTitle("Wizard setFocus() issue")

        self.addPage(ClassInfoPage())


if __name__ == '__main__':
    app = QApplication(sys.argv)
    wizard = MyWizard()
    wizard.show()
    sys.exit(wizard.exec())

Screenshot wrong focus:

The code below works for a window:

# Focus works in normal window!
from PySide6.QtWidgets import QApplication, QMainWindow, QWidget, QLineEdit, QHBoxLayout
import sys

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        self.setMinimumSize(400, 100)
        self.setWindowTitle("Focus example")

        txt_edit1 = QLineEdit('txt_edit1: Focused: wrong')
        txt_edit2 = QLineEdit('txt_edit2: Focus not set')

        layout = QHBoxLayout()
        layout.addWidget(txt_edit1)
        layout.addWidget(txt_edit2)

        widget = QWidget()
        widget.setLayout(layout)

        self.setCentralWidget(widget)

        # setFocus() works for a normal QMainWindow application!
        txt_edit2.setFocus()


if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    app.exec()

Screenshot correct focus:

Is setFocus() a bug in QWizard or do I something wrong?

Erriez

Workaround is calling setFocus() via a QTimer.singleShot():

+from PySide6.QtCore import QTimer

class ClassInfoPage(QWizardPage):
    def __init__(self, parent=None):
        super().__init__(parent)

        self.txt_edit1 = QLineEdit('txt_edit1: Focused: wrong')
        self.txt_edit2 = QLineEdit('txt_edit2: Focus not set')

        layout = QHBoxLayout(self)
        layout.addWidget(self.txt_edit1)
        layout.addWidget(self.txt_edit2)

+        # Workaround to call setFocus() from a timer event:
+        QTimer.singleShot(0, self.timer_event)

+    def timer_event(self):
+        self.txt_edit2.setFocus()

Any suggestion why txt_edit2.setFocus() is not working from the QWizardPage constructor?

JonB

@Erriez said in Pyside6 QWizard setFocus() not working:

Any suggestion why txt_edit2.setFocus() is not working from the QWizardPage constructor?

I have a feeling this, or similar, may have been asked before. I suspect the wizard does its own focus setting as each page is shown. Therefore the technique of doing your own setFocus() on a delayed timer is required for your code to change which widget has focus.

Erriez

@JonB Thanks for your confirmation. I found this suggestion somewhere on the internet (not in this Qt forum). The behavior is not clear for me when reading the documentation, but maybe I overlooked something. I'll continue with this workaround.