Curtain.qml Example File

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 import QtQuick 1.0
 import Qt.labs.shaders 1.0

 Item {
     id: main
     anchors.fill: parent

     Rectangle{
         id: bg
         anchors.fill: parent
         color: "black"
     }

     Image {
         source: "images/qt-logo.png"
         anchors.centerIn: parent
     }

     Image {
         id: fabric
         anchors.fill: parent
         source: "images/fabric.jpg"
         fillMode: Image.Tile
     }

     CurtainEffect {
         id: curtain
         anchors.fill: fabric
         bottomWidth: topWidth
         source: ShaderEffectSource { sourceItem: fabric; hideSource: true }

         Behavior on bottomWidth {
             SpringAnimation { easing.type: Easing.OutElastic; velocity: 250; mass: 1.5; spring: 0.5; damping: 0.05}
         }

         SequentialAnimation on topWidth {
             id: topWidthAnim
             loops: Animation.Infinite

             NumberAnimation { to: 360; duration: 1000 }
             PauseAnimation { duration: 2000 }
             NumberAnimation { to: 180; duration: 1000 }
             PauseAnimation { duration: 2000 }
         }
     }

     MouseArea {
         anchors.fill: parent

         onPressed: {
             topWidthAnim.stop()
             curtain.topWidth = mouseX;
         }

         onReleased: {
             topWidthAnim.restart()
         }

         onPositionChanged: {
             if (pressed) {
                 curtain.topWidth = mouseX;
             }
         }
     }
 }