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
         }
     }
 }