ScrollBar.qml Example File

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  import QtQuick 2.0

  Item {
      id: container

      property variant flickableArea

      Rectangle {
          radius: 5
          color: "black"
          opacity: 0.3
          border.color: "white"
          border.width: 2
          x: 0
          y: flickableArea.visibleArea.yPosition * container.height
          width: parent.width
          height: flickableArea.visibleArea.heightRatio * container.height
      }
      states: [
          State {
              name: "show"
              when: flickableArea.movingVertically
              PropertyChanges {
                  target: container
                  opacity: 1
              }
          }
      ]
      transitions: [
          Transition {
              from: "*"
              to: "*"
              NumberAnimation {
                  target: container
                  properties: "opacity"
                  duration: 400
              }
          }
      ]
  }