Here is a complete listing of the example source file.
import QtQuick 2.11
import QtQuick.Layouts 1.3
import QtQuick.Controls 2.1
 
 
ColumnLayout {
    anchors.fill: parent
 
    property real quadrat: Theme.units.quadrat
 
    Column {
        Layout.alignment: 
Qt.AlignCenter
 
        Slider {
            id: slider
 
            from: 0
            to: 100
        }
 
        Item {
            width: quadrat * 2.5
            height: quadrat * 3.75
 
            PropItem {
                id: sidePropNumberDisplay
 
                anchors.horizontalCenter: parent.horizontalCenter
 
                leftPadding: quadrat * 0.25
                rightPadding: quadrat * 0.25
                bottomPadding: quadrat * 0.5
 
                NumberDisplay {
                    value: slider.value * 10
                    integralWidth: 4
                    fractionalWidth: 0
                    unit: "kWh"
 
                    warning: value > 500
                    alarm: value > 800
                }
            }
 
            RectangularElement {
                id: element
 
                anchors.top: sidePropNumberDisplay.bottom
                width: parent.width
                height: parent.height - sidePropNumberDisplay.height - propNumberDisplay.height
 
                active: slider.value > 0
                warning: slider.value > 80
                alarm: slider.value > 90
 
                NumberDisplay {
                    id: numberDisplay
 
                    anchors.centerIn: parent
 
                    value: slider.value
 
                    warning: value > 30
                    alarm: value > 70
                }
            }
 
            PropItem {
                id: propNumberDisplay
 
                anchors.top: element.bottom
                anchors.horizontalCenter: parent.horizontalCenter
 
                topPadding: quadrat * 0.25
 
                NumberDisplay {
                    value: slider.value
                    fractionalWidth: 2
                    unit: "Pa"
 
                    warning: value > 60
                    alarm: value > 90
                }
            }
        }
    }
 
    Component.onCompleted: {
        Theme.units.quadrat = 80
    }
}