How Can I Update My Qt Designer UI Without Losing My Code Changes?

QtDesigner UI Updates Without Overwriting Changes

If you've encountered the issue where UI changes made in Qt Designer are later overwritten after code conversion, this article provides a solution to preserve your modifications.

To address this problem, avoid modifying the generated Python code directly. Instead, create a separate class in a new file to handle the UI logic. This class should inherit from the design class generated by Qt Designer and implement its methods.

Example:

Consider a MainWindow template with a corresponding design.ui file. Convert it to Ui_Design.py as follows:

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        [...]

    def retranslateUi(self, MainWindow):
        [...]

Create a new file logic.py:

class Logic(QMainWindow, Ui_MainWindow):
    def __init__(self, *args, **kwargs):
        QMainWindow.__init__(self, *args, **kwargs)
        self.setupUi(self)

By following these rules, you can modify the design and regenerate its code without affecting your logic implementation. Ensure that your logic class adheres to the following structure:

class Logic(PyQtClass, DesignClass):
    def __init__(self, *args, **kwargs):
        PyQtClass.__init__(self, *args, **kwargs)
        self.setupUi(self)

Where:

• PyQtClass depends on the design template (e.g., QMainWindow, QWidget).
• DesignClass is the name of the class in your design (e.g., Ui_MainWindow).

Additional Benefits:

This implementation allows you to implement logic within a designated widget, like closing a pyqt messageBox with the parent window's closeEvent:

class Logic(QMainWindow, Ui_MainWindow):
    def __init__(self, *args, **kwargs):
        QMainWindow.__init__(self, *args, **kwargs)
        self.setupUi(self)

    def closeEvent(self, event):
        answer = QtWidgets.QMessageBox.question(
            self,
            'Are you sure you want to quit ?',
            'Task is in progress !',
            QtWidgets.QMessageBox.Yes,
            QtWidgets.QMessageBox.No
        )
        if answer == QtWidgets.QMessageBox.Yes:
            event.accept()
        else:
            event.ignore()

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