Python Qt6 - Show QWidget window horizontally and vertically centered on screen - How to do it?

PythonQTMarlem

Hello,
the following code:

import sys
from PyQt6.QtWidgets import QApplication, QWidget, QVBoxLayout, QLabel, \
    QPushButton, QFormLayout, QLineEdit


class Window(QWidget):
    define __init__(self):
        super().__init__()
        self.UI()

    define UI(self):
        self.setWindowTitle("QFormLayout()")
        self.lname = QLabel("&Name:")
        self.nameLineEdit = QLineEdit()
        self.lmail = QLabel("&Email:")
        self.emailLineEdit = QLineEdit()
        self.lname.setBuddy(self.nameLineEdit)
        self.lmail.setBuddy(self.emailLineEdit)
        self.btn_programm_beenden = QPushButton("En&de", self)
        self.btn_terminate_program.setDefault(True)
        self.btn_programm_beenden.clicked.connect( self.programm_beeden)

        formLayout = QFormLayout()
        #Several control elements can be placed in a row
        #to be included
        formLayout.addRow(self.lname,self.nameLineEdit)
        formLayout.addRow(self.lmail,self.emailLineEdit)
        formLayout.addRow(self.btn_terminate_program)
        self.setLayout(formLayout)

    def program_finished(self):
        QApplication.instance().quit()


app = QApplication(sys.argv)
window = Window()
window.show()
sys.exit(app.exec())

Question:
How can I center the window horizontally and vertically on the screen?

JonB

@PythonQTMarlem
https://wiki.qt.io/How_to_Center_a_Window_on_the_Screen

PythonQTMarlem

Thank you.
But when I start the Python program I get this error message:
Traceback (most recent call last):
File "D:\Projekte\Python\qtadressverw\qtadressv.py", line 26, in <module>
import DesktopWidget
ModuleNotFoundError: No module named 'DesktopWidget'

What can I do?

JonB

@PythonQTMarlem said in Python Qt6 - Show QWidget window horizontally and vertically centered on screen - How to do it?:

import DesktopWidget
ModuleNotFoundError: No module named 'DesktopWidget'

You should not have any line import DesktopWidget, that does not occur anywhere in the reference I gave you, and Qt would not define a class/module spelled like that.

PythonQTMarlem

@JonB in Your Link there is:

include <QStyle>
include <QDesktopWidget>

It's C-Code, but I know what it means.

Now I get this errormessage:
D:\Projekte\Python\qtadressverw\venv\Scripts\python.exe D:\Projekte\Python\qtadressverw\qtadressv.py
Traceback (most recent call last):
File "D:\Projekte\Python\qtadressverw\qtadressv.py", line 146, in <module>
fenster = FensterKlasse()
File "D:\Projekte\Python\qtadressverw\qtadressv.py", line 32, in init
self.GUI()
File "D:\Projekte\Python\qtadressverw\qtadressv.py", line 40, in GUI
QStyle.alignedRect(Qt.LeftToRight,
AttributeError: type object 'Qt' has no attribute 'LeftToRight'

What I have to do?

JonB

@PythonQTMarlem said in Python Qt6 - Show QWidget window horizontally and vertically centered on screen - How to do it?:

include <QDesktopWidget>

That is QDesktopWidget. Your import and error message show you are trying import DesktopWidget, which does not exist like it says. No Qt class/module would be provided without a leading Q.

If you cannot translate the C++ to Python look at an example like https://pythonprogramminglanguage.com/pyqt5-center-window/, which uses the same principle.

PythonQTMarlem

Thanks! But from PyQt5 to PyQt6 there were changes: Traceback (most recent call last):
File "D:\Projects\Python\qtadressverw\qtadressv.py", line 23, in <module>
from PyQt6.QtWidgets import QWidget, QDesktopWidget
ImportError: cannot import name 'QDesktopWidget' from 'PyQt6.QtWidgets' (D:\Projects\Python\qtadressverw\venv\lib\site-packages\PyQt6\QtWidgets.pyd)

JonB

@PythonQTMarlem
So try Googling pyqt6 QDesktopWidget, where the first hit is https://stackoverflow.com/questions/68037950/module-pyqt6-qtwidgets-has-no-attribute-qdesktopwidget

PythonQTMarlem

Thanks very much! It works! But my problem is I would like to figure it out myself with this documentation https://doc.qt.io/qtforpython/ . But I have no idea how to do that!