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import Qt 4.7

Item {

    id: container

    property variant flickableArea

    Rectangle {

        radius: 5

        color: "black"

        opacity: 0.3

        border.color: "white"

        border.width: 2

        x: 0

        y: flickableArea.visibleArea.yPosition * container.height

        width: parent.width

        height: flickableArea.visibleArea.heightRatio * container.height

    }

    states: [

        State {

            name: "show"

            when: flickableArea.movingVertically

            PropertyChanges {

                target: container

                opacity: 1

            }

        }

    ]

    transitions: [

        Transition {

            from: "*"

            to: "*"

            NumberAnimation {

                target: container

                properties: "opacity"

                duration: 400

            }

        }

    ]

}