Passing extra arguments to object that is generated by QtDesigner

JokZiz1

I have created custom class that inherits from QListWidget. I have promoted widget to my custom class through QtDesigner. Problem is, that I need to pass additional argument to that Widget, which I am able to do manually, but every time I rebuild my GUI, it will obviously get changed. I provide example below if I am not clear enough:

custom.py:

class LoggerList(QListWidget):
    def __init__(self, extra_argument, parent = None) -> None:
        super(LoggerList, self).__init__(parent)
        self.argument= extra_argument

I have GUI built on QtDesigner and this is what is generated:

main_window_ui.py

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        if not MainWindow.objectName():
            MainWindow.setObjectName(u"MainWindow")
        MainWindow.resize(1583, 883)
        font = QFont()
        font.setFamily(u"Segoe UI")
        MainWindow.setFont(font)
        self.centralwidget = QWidget(MainWindow)
        self.centralwidget.setObjectName(u"centralwidget")
        self.main_display = QLabel(self.centralwidget)
        self.main_display.setObjectName(u"main_display")
        self.main_display.setGeometry(QRect(10, 100, 581, 581))
        self.main_display.setFocusPolicy(Qt.NoFocus)
        self.main_display.setStyleSheet(u"background-color: rgb(160, 160, 160);")
        self.main_display.setAlignment(Qt.AlignCenter)
        self.main_display.setIndent(0)
        self.listWidget = LoggerList(self.groupBox_4)
        self.listWidget.setObjectName(u"listWidget")
        self.listWidget.setGeometry(QRect(10, 20, 1021, 111))

What I want is (3rd last row):

self.listWidget = LoggerList(my_extra_argument, self.groupBox_4)

If I manually change main_window_ui.py file by adding the argument, everything works fine, however, whenever I generate main_window_ui.py file over again, my_extra_argument is lost, all I can do is add it over again manually every time i regenrate my UI file. Is there any way to let Designer know, that I want to pass another argument to my QListWidget?

mpergand

Hi,

It's possible with dynamic properties, but as you want to pass an object, it's a little bit tricky:

In the designer, you create a property named "argument" ( + sign on the right panel) and set groupBox_4 as value for this property.

Then by code you can retreave that object:

QString name=ui->listWidget->property("argument").toString();
QGroupBox* box=findChild<QGroupBox*>(name);
if(box) { 
   // do what you want width the groupbox 
   }

From inside LoggerList, you have to start the search from the window :
QGroupBox* box=window()->findChild<QGroupBox*>(name);