"currentValue" is a read-only property of ComboBox

eschutz

I am trying to run the (minimally modified) example for Model Roles on the ComboBox QML Type:

import QtQuick
import QtQuick.Controls

ApplicationWindow {
    width: 640
    height: 480
    visible: true

    // Used as an example of a backend - this would usually be
    // e.g. a C++ type exposed to QML.
    QtObject {
        id: backend
        property int modifier: Qt.NoModifier
    }

    ComboBox {
        model: [
            { value: Qt.NoModifier, text: qsTr("No modifier") },
            { value: Qt.ShiftModifier, text: qsTr("Shift") },
            { value: Qt.ControlModifier, text: qsTr("Control") }
        ]
        textRole: "text"
        valueRole: "value"
        // Set currentValue to the value stored in the backend.
        currentValue: backend.modifier
        // When an item is selected, update the backend.
        onActivated: backend.modifier = currentValue
    }
}

Running this with pyside6-qml produces the error Invalid property assignment: "currentValue" is a read-only property. This example is taken directly from the documentation. How can I set the value of the combo box?

GrecKo

currentValue is writeable since Qt 6.10 only.

Bandler

You can set the current index instead with something like that:

Component.onCompleted: {
     let index = indexOfValue(backend.modifier);
     if (index >= 0) {
              currentIndex = index
     }
}

GrecKo

currentValue is writeable since Qt 6.10 only.

eschutz

Apparently I was running 6.9.3. Code works in 6.10. Thank you!