Animate positionViewAtIndex in ListView

[ephe]

I have a ListView which looks like a Carousel. The centered item is the current item. When the view is flicked and the flicking does not stop exactly in the middle of the item, the item is snapped.
I would like to have a smooth transition, no snapping. Is this possible?

I have already read this "post":http://www.qtcentre.org/threads/40680-Animate-ListView-positionViewAtIndex, but for me it did not work and maybe there is a better solution?
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import QtQuick 2.0

Rectangle {
width: 800
height: 300

ListView
{
    id: flickable
    clip: true
    anchors.fill: parent
    orientation: ListView.Horizontal
    anchors.topMargin: 50
    anchors.bottomMargin: 50
    cacheBuffer: 800
    boundsBehavior: Flickable.StopAtBounds
    highlightFollowsCurrentItem: true
    onFlickEnded: positionViewAtIndex(currentIndex, ListView.Center)
    onMovementEnded: positionViewAtIndex(currentIndex, ListView.Center)

    onCurrentIndexChanged:
    {
        if (!moving && !flicking)
        {
            positionViewAtIndex(currentIndex, ListView.Center)
        }
    }

    onContentXChanged:
    {
        var centerItem = indexAt(contentX+width/2, contentY+height/2)
        if ( centerItem <= 0 )
        {
            centerItem = 0
        }
        else if ( centerItem > count )
        {
            centerItem = count-1
        }
        currentIndex = centerItem
    }

    spacing: -300/2.5
    focus: true
    header: Item {width: 300; height: 200 }
    footer: Item {width: 300; height: 200 }

    model: 10
    delegate:
        Rectangle
        {
        width: 300
        height: 200
        color: "lightgrey"
        border.color: "green"
        border.width: 2
        z: {
            if (flickable.currentIndex == index) flickable.currentIndex
            else if (flickable.currentIndex > index) index
            else flickable.currentIndex-index
        }
        Text
        {
            font.pointSize: 16
            text: index
            anchors.centerIn: parent
        }

        scale:
        {
            if(flickable.currentIndex == index)
            {
                1.0
            }
            else if (flickable.currentIndex-1 == index || flickable.currentIndex+1 == index)
            {
                0.83
            }
            else if (flickable.currentIndex-2 == index || flickable.currentIndex+2 == index)
            {
                0.74
            }
            else
            {
                0.0
            }
        }

        Behavior on scale
        {
            NumberAnimation { duration: 200 }
        }
    }
}

}
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