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** This file is part of the examples of the Qt Toolkit.
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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;
            }
        }
    }
}