Flat-style Qml scroll selection bar

Based Qml of Tumbler control revisions.

Scroll through lines of code

import QtQuick 2.0
import QtQuick.Controls 2.0
import QtGraphicalEffects 1.0

Tumbler {
    id: root

    property color currentItemColor: "#3498DB"

    visibleItemCount: 5

    delegate: Text {
        text: modelData
        color: root.currentItemColor

        font.family: "Arial"
        font.weight: Font.Thin
        font.pixelSize: 50

        horizontalAlignment: Text.AlignHCenter
        verticalAlignment: Text.AlignVCenter
        opacity: 1.0 - Math.abs(Tumbler.displacement) / root.visibleItemCount
        scale: opacity
    }

    background: Rectangle {
        width: root.width;
        height: root.height
        border.color: "#EBEDEF"

        layer.enabled: root.hovered
        layer.effect: DropShadow {
            transparentBorder: true
            color: root.currentItemColor
            samples: 5 /*20*/
        }
    }
}

Scroll selection bar style code

GridLayout {
    width: root.width
    rows: 3

    Repeater {
        model: ["#727CF5", "#0ACF97", "#F9375E",
                "#FFBC00", "#2B99B9", "#5A6268",
                "#EEF2F7", "#212730", "#3498DB"]

        Tumbler {
            model: ["00", "01", "02", "03", "04", "05"]
            currentItemColor: modelData
        }
    }
}

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