Cockpit-cpp/ZjQt/Run/QtQuick/Controls/Material/Tumbler.qml

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import QtQuick
import QtQuick.Controls.impl
import QtQuick.Templates as T
import QtQuick.Controls.Material

T.Tumbler {
    id: control

    implicitWidth: Math.max(implicitBackgroundWidth + leftInset + rightInset,
                            implicitContentWidth + leftPadding + rightPadding)
    implicitHeight: Math.max(implicitBackgroundHeight + topInset + bottomInset,
                             implicitContentHeight + topPadding + bottomPadding)

    delegate: Text {
        text: modelData
        color: control.Material.foreground
        font: control.font
        opacity: (1.0 - Math.abs(Tumbler.displacement) / (control.visibleItemCount / 2)) * (control.enabled ? 1 : 0.6)
        horizontalAlignment: Text.AlignHCenter
        verticalAlignment: Text.AlignVCenter

        required property var modelData
        required property int index
    }

    contentItem: TumblerView {
        implicitWidth: 60
        implicitHeight: 200
        model: control.model
        delegate: control.delegate
        path: Path {
            startX: control.contentItem.width / 2
            startY: -control.contentItem.delegateHeight / 2
            PathLine {
                x: control.contentItem.width / 2
                y: (control.visibleItemCount + 1) * control.contentItem.delegateHeight - control.contentItem.delegateHeight / 2
            }
        }

        property real delegateHeight: control.availableHeight / control.visibleItemCount
    }
}