QML Tumbler horizontally align visible items separately

[TomsBrook]

Hi I am using a QML Tumbler item with Qt5.5 and have a tumbler showing three visible elements and am trying to have the delegate above the current item aligned to the top of the tumbler and the delegate below the current item to align to the bottom - just to set some space between the three elements and fill the tumbler.

TumblerStyle{
            id: tumblerStyle
            visibleItemCount: 3
            background: Item{
                id: background_tmblr
                visible: false
            }

            foreground: Item{
                id: foreground_tmblr
                visible: false
            }

            delegate: Item {
                id: delegate_style
                implicitHeight: (parent.height - padding.top - padding.bottom) / tumblerStyle.visibleItemCount
                implicitWidth: (parent.width - padding.top - padding.bottom)
                Layout.alignment: Qt.AlignLeft | Qt.AlignVCenter
                anchors.centerIn: parent
                Item{
                    ColumnLayout {
                        id: metadata_tmbler
                        anchors.fill: parent
                        spacing: 10
                        Layout.alignment: Qt.AlignLeft | Qt.AlignVCenter

                        Text {
                            verticalAlignment: styleData.current? Text.AlignVCenter : styleData.displacement > 0? Text.AlignBottom : Text.AlignTop
                            horizontalAlignment: Text.AlignHCenter
                            Layout.preferredWidth: 300
                            Layout.preferredHeight: 40
                        }//Text
                    }//Column Layout
                }//item
            }//delegate Item

but I can't seem to get the vertical alignment to accurately show this.
Top Item - aligned to top of tumbler
Middle Item - aligned to center of tumbler
Bottom Item - aligned to bottom of tumbler

Thanks