qtdeclarative/examples/declarative/canvas/contents/Slider.qml

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import QtQuick 2.0

Item {
    id:slider
    property real min:0
    property real max:1
    property real value: min + (max - min) * (bar.x / (foo.width - bar.width))
    property real init:min+(max-min)/2
    property string name:"Slider"

    Component.onCompleted: setValue(init)
    function setValue(v) {
       if (min < max)
          bar.x = v/(max - min) * (foo.width - bar.width);
    }
    Rectangle {
        id:sliderName
        anchors.left:parent.left
        height: childrenRect.height
        width:childrenRect.width
        anchors.verticalCenter:parent.verticalCenter
        Text {
           text:slider.name
           font.pointSize:12
         }
    }
    Item {
        id: foo
        height: 6
        width: parent.width - 4 - sliderName.width
        anchors.verticalCenter:parent.verticalCenter
        anchors.left:sliderName.right
        anchors.leftMargin:5
        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
            }
        }
    }
}