How Can I Preserve My Code Changes When Redesigning Qt Designer UIs in Python?

Preserving Changes in Qt Designer Interfaces after UI Redesign

When working with Qt Designer to create graphical user interfaces (GUIs) for Python applications, it's essential to avoid losing previous changes when modifying the UI and generating updated Python code. To address this issue, rather than modifying the generated Python code, consider the following strategy:

Separate Design and Logic in Multiple Files

• Design the UI in Qt Designer and convert it to a Python file that defines the design, such as Ui_Design.py.
• Create a separate module, e.g. logic.py, that implements the application logic and uses the design file as shown below:

from Ui_Design import Ui_MainWindow

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

By managing the design and logic in separate files, you can modify the UI in Qt Designer without affecting the logic code.

Rules for Separating Design and Logic

When implementing this strategy, it's crucial to adhere to the following rules:

• PyQtClass: Select the appropriate PyQt class based on the UI template used. (See table below for reference)
• DesignClass: Use the name of the class defined in the design file.

**	Template	PyQtClass	**
Main Window	QMainWindow
Widget	QWidget
Dialog with Buttons Bottom	QDialog
Dialog with Buttons Right	QDialog
Dialog with Without Buttons	QDialog

Preserving Logic with Specific Implementation

For example, consider preserving the logic to close a PyQt MessageBox with the close event of the parent window:

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()

By following these guidelines, you can preserve your code changes when modifying Qt Designer UIs, ensuring a seamless workflow and preventing data loss.

The above is the detailed content of How Can I Preserve My Code Changes When Redesigning Qt Designer UIs in Python?. For more information, please follow other related articles on the PHP Chinese website!