How to check only one switch in ListView

Iheb

I have a qml ListView that show languages and respective switches as shown in the code below. The English language is initially selected. Howerver, with this code I can select multiple languages. I want to select only one (when I select one language the others are automatically unselected). How to do it? I'm using Qt 5.8.0 and QtQuick.Controls 2.0

    id: langlist
    clip: true

    model: ListModel {
        ListElement { selected:true; title: "English"}
        ListElement { selected:false;title: "French"}
        ListElement { selected:false;title: "German"}
        ListElement { selected:false;title: "Italian"}
    }

    delegate: Rectangle{
        id: langelement
        height: 70
        width: parent.width
        color: "transparent"
        Label{
            anchors.left: langelement.left
            anchors.leftMargin: 30
            anchors.top : langelement.top
            anchors.topMargin: 30
            text: model.title
            font.family: "Lato"
            font.pixelSize: 30
            font.bold: false
            color: "#FFFFFF"
        }

        Switch {
            id: control
            anchors.right: langelement.right
            anchors.rightMargin: 30
            anchors.top : langelement.top
            anchors.topMargin: 20
            checked: model.selected
        }
    }
}

I tried to use onPressed signal but it doesn't work properly. When I check the switch it turns on and directly turns off, dispite the selectedIndex property get the new value of the index.

ListView{
    id: langlist
    clip: true

    property int selectedIndex : 0

    model: ListModel {
        ListElement { selected:true; title: "English"}
        ListElement { selected:false;title: "French"}
        ListElement { selected:false;title: "German"}
        ListElement { selected:false;title: "Italian"}
    }

    delegate: Rectangle{
        id: langelement
        height: 70
        width: parent.width
        color: "transparent"
        Label{
            anchors.left: langelement.left
            anchors.leftMargin: 30
            anchors.top : langelement.top
            anchors.topMargin: 30
            text: model.title
            font.family: "Lato"
            font.pixelSize: 30
            font.bold: false
            color: "#FFFFFF"
        }

        Switch {
            id: control
            anchors.right: langelement.right
            anchors.rightMargin: 30
            anchors.top : langelement.top
            anchors.topMargin: 20
            checked: selectedIndex == index

            onPressed: selectedIndex = index
        }
    }
}

IntruderExcluder

Try something like this:

            Switch {
                id: control
                ...

                checked: model.selected
                checkable: !checked // Prevent to uncheck already checked switch

                onPressed: {
                    if (!checked) {
                        for (let i = 0; i < langlist.model.count; ++i) {
                            langlist.model.setProperty(i, "selected", i === model.index); // Toggle all switches
                        }
                    }
                }
            }