Getting Started Programming with Qt Quick

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 import QtQuick
 import QtQuick.Controls
 import QtQuick.Controls.Material

 Text {
     text: modelData
     color: Tumbler.tumbler.Material.foreground
     font: Tumbler.tumbler.font
     opacity: 1.0 - Math.abs(Tumbler.displacement) / (Tumbler.tumbler.visibleItemCount / 2)
     horizontalAlignment: Text.AlignHCenter
     verticalAlignment: Text.AlignVCenter
 }