Allow disabling interaction with controls

In design studio there is a use case where a CheckBox can be "read-only". The user can't click on it, but they can click on an action indicator to the left of it that opens a menu. Currently the only way to achieve this is to use a MouseArea to block the CheckBox while the "readOnly" property is true. Using Binding to force the checked state doesn't work (you can still affect it by clicking on it):

import QtQuick 2.12
import QtQuick.Controls 2.12

ApplicationWindow {
    width: 640
    height: 480
    visible: true

    CheckBox {
        id: checkBox

        property bool readOnly: true

        Binding {
            target: checkBox
            property: "checked"
            value: false
            when: checkBox.readOnly
        }

        Binding {
            target: checkBox
            property: "checkState"
            value: Qt.Unchecked
            when: checkBox.readOnly
        }
    }
}

Setting enabled to false is not an option because that then disables the action indicator (which is a child of the CheckBox).

So we could add an interactive property which disables interaction with the control itself but not its children.