Make it easier to use tri-state CheckBoxes

import QtQuick 2.6
import QtQuick.Controls 2.0
import QtQuick.Layouts 1.1
import QtQuick.Window 2.0

Window {
    width: column.implicitWidth
    height: column.implicitHeight
    visible: true

    ColumnLayout {
        id: column
        anchors.centerIn: parent

        CheckBox {
            text: qsTr("Languages")
            checkState: english.checked && norwegian.checked
                ? Qt.Checked : (english.checked || norwegian.checked) ? Qt.PartiallyChecked : Qt.Unchecked
            tristate: true
        }
        CheckBox {
            id: english
            text: qsTr("English")
            checked: true
            leftPadding: indicator.width
        }
        CheckBox {
            id: norwegian
            text: qsTr("Norwegian")
            checked: true
            leftPadding: indicator.width
        }
    }
}