Curtain.qml Example File

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import QtQuick 2.0

Rectangle {
    id: root
    color: "transparent"
    radius: 5
    property alias value: grip.value
    property color gripColor: "transparent"
    property real gripSize: 20
    property real gripTolerance: 3.0
    property real increment: 0.1
    property bool enabled: true
    property string imageSource: "qrc:/images/Triangle_Top.png"

    Rectangle {
        id: grip
        property real value: 0.5
        x: (value * parent.width) - width/2
        anchors.verticalCenter: parent.verticalCenter
        width: root.gripTolerance * root.gripSize
        height: width
        radius: width/2
        color: "transparent"

        Image {
            id: sliderhandleimage
            source: imageSource
            anchors.centerIn: parent
        }

        MouseArea {
            id: mouseArea
            enabled: root.enabled
            anchors.fill:  parent
            drag {
                target: grip
                axis: Drag.XAxis
                minimumX: -parent.width/2
                maximumX: root.width - parent.width/2
            }
            onPositionChanged:  {
                if (drag.active)
                    updatePosition()
            }
            onReleased: {
                updatePosition()
            }
            function updatePosition() {
                value = (grip.x + grip.width/2) / grip.parent.width
            }
        }
    }
}