Slider.qml Example File

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  import QtQuick 2.0

  Item {
      property real value: bar.x / (foo.width - bar.width)
      Item {
          id: foo
          width: parent.width - 4
          height: 6
          anchors.centerIn: parent

          Rectangle {
              height: parent.height
              anchors.left: parent.left
              anchors.right: bar.horizontalCenter
              color: "blue"
              radius: 3
          }
          Rectangle {
              height: parent.height
              anchors.left: bar.horizontalCenter
              anchors.right: parent.right
              color: "gray"
              radius: 3
          }
          Rectangle {
              anchors.fill: parent
              color: "transparent"
              radius: 3
              border.width: 2
              border.color: "black"
          }

          Rectangle {
              id: bar
              y: -7
              width: 20
              height: 20
              radius: 15
              color: "white"
              border.width: 2
              border.color: "black"
              MouseArea {
                  anchors.fill: parent
                  drag.target: parent
                  drag.axis: Drag.XAxis
                  drag.minimumX: 0
                  drag.maximumX: foo.width - parent.width
              }
          }
      }
  }