Curtain.qml Example File

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  import QtQuick 2.0

  Rectangle {
      id: root
      color: "transparent"
      radius: 5
      property alias value: grip.value
      property color gripColor: "transparent"
      property real gripSize: 20
      property real gripTolerance: 3.0
      property real increment: 0.1
      property bool enabled: true
      property string imageSource: "qrc:/images/Triangle_Top.png"

      Rectangle {
          id: grip
          property real value: 0.5
          x: (value * parent.width) - width/2
          anchors.verticalCenter: parent.verticalCenter
          width: root.gripTolerance * root.gripSize
          height: width
          radius: width/2
          color: "transparent"

          Image {
              id: sliderhandleimage
              source: imageSource
              anchors.centerIn: parent
          }

          MouseArea {
              id: mouseArea
              enabled: root.enabled
              anchors.fill:  parent
              drag {
                  target: grip
                  axis: Drag.XAxis
                  minimumX: -parent.width/2
                  maximumX: root.width - parent.width/2
              }
              onPositionChanged:  {
                  if (drag.active)
                      updatePosition()
              }
              onReleased: {
                  updatePosition()
              }
              function updatePosition() {
                  value = (grip.x + grip.width/2) / grip.parent.width
              }
          }
      }
  }