DropShadow.qml Example File

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import QtQuick 1.0
Item {
    id: main
    anchors.fill: parent
    Image {
        id: background
        anchors.fill: parent
        source: "images/bg.jpg"
    }
    DropShadowEffect {
        id: layer
        property real distance: 0.0
        width: photo.width
        height: photo.height
        sourceItem: photo
        color: "black"
        blur: distance / 10.0
        opacity: 1 - distance / 50.0
        Binding {
            target: layer
            property: "x"
            value: -0.4 * layer.distance
            when: !dragArea.pressed
        }
        Binding {
            target: layer
            property: "y"
            value: 0.9 * layer.distance
            when: !dragArea.pressed
        }
        SequentialAnimation on distance {
            id: animation
            running: true
            loops:  Animation.Infinite
            NumberAnimation { to: 30; duration: 2000 }
            PauseAnimation { duration: 500 }
            NumberAnimation { to: 0; duration: 2000 }
            PauseAnimation { duration: 500 }
        }
    }
    Image {
        id: photo
        anchors.fill: parent
        source: "images/drop_shadow.png"
        smooth: true
    }
    MouseArea {
        id: dragArea
        anchors.fill: parent
        property int startX
        property int startY
        onPressed: {
            startX = mouseX
            startY = mouseY
        }
        onPositionChanged: {
            layer.x += mouseX - startX
            layer.y += mouseY - startY
            startX = mouseX
            startY = mouseY
        }
    }
}