dialcontrol.qml Example File

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 import QtQuick 2.2
 import QtQuick.Window 2.1
 import "content"

 Rectangle {
     color: "#545454"
     width: 300; height: 300

     // Dial with a slider to adjust it
     Dial {
         id: dial
         anchors.centerIn: parent
         value: slider.x * 100 / (container.width - 32)
     }

     Rectangle {
         id: container
         property int oldWidth: 0
         anchors { bottom: parent.bottom; left: parent.left
             right: parent.right; leftMargin: 20; rightMargin: 20
             bottomMargin: 10
         }
         height: 16

         radius: 8
         opacity: 0.7
         antialiasing: true
         gradient: Gradient {
             GradientStop { position: 0.0; color: "gray" }
             GradientStop { position: 1.0; color: "white" }
         }

         onWidthChanged: {
             if (oldWidth === 0) {
                 oldWidth = width;
                 return
             }

             var desiredPercent = slider.x * 100 / (oldWidth - 32)
             slider.x = desiredPercent * (width - 32) / 100
             oldWidth = width
         }

         Rectangle {
             id: slider
             x: 1; y: 1; width: 30; height: 14
             radius: 6
             antialiasing: true
             gradient: Gradient {
                 GradientStop { position: 0.0; color: "#424242" }
                 GradientStop { position: 1.0; color: "black" }
             }

             MouseArea {
                 anchors.fill: parent
                 anchors.margins: -16 // Increase mouse area a lot outside the slider
                 drag.target: parent; drag.axis: Drag.XAxis
                 drag.minimumX: 2; drag.maximumX: container.width - 32
             }
         }
     }
     QuitButton {
         anchors.right: parent.right
         anchors.top: parent.top
         anchors.margins: 10
     }
 }