QGCSlider.qml

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import QtQuick 2.1
import QGroundControl.Controls 1.0

Item {
    id: slider;
    height: 12
    property real value // value is read/write.
    property real minimum: 0
    property real maximum: 1
    property int length: width - handle.width

    Rectangle {
        anchors.fill:   parent
        radius:         6
        color:          Qt.rgba(0,0,0,0.65);
    }

    Rectangle {
        anchors.left:       parent.left
        anchors.leftMargin: 4
        radius:             4
        height:             4
        width:              handle.x - x
        color:              "#69bb17"
        anchors.verticalCenter: parent.verticalCenter
    }

    Rectangle {
        id:                 labelRect
        width:              label.width
        height:             label.height + 4
        radius:             4
        smooth:             true
        color:              Qt.rgba(1,1,1,0.75);
        border.width:       1
        border.color:       Qt.rgba(0,0,0,0.45);
        anchors.bottom:     handle.top
        anchors.bottomMargin: 4
        visible: mouseRegion.pressed
        x: Math.max(Math.min(handle.x + (handle.width - width ) / 2, slider.width - width), 0)
        QGCLabel{
            id:     label
            color:  "black"
            text:   slider.value.toFixed(2)
            width:  font.pointSize * 3.5
            anchors.horizontalCenter:   labelRect.horizontalCenter
            horizontalAlignment:        Text.AlignHCenter
            anchors.verticalCenter:     labelRect.verticalCenter
        }
    }

    Rectangle {
        id:         handle;
        smooth:     true
        width:      26;
        y:          (slider.height - height) / 2;
        x:          (slider.value - slider.minimum) * slider.length / (slider.maximum - slider.minimum)

        height:     width
        radius:     width / 2
        gradient:   normalGradient
        border.width: 2
        border.color: "white"

        Gradient {
            id: normalGradient
            GradientStop { position: 0.0;  color: "#b0b0b0" }
            GradientStop { position: 0.66; color: "#909090" }
            GradientStop { position: 1.0;  color: "#545454" }
        }

        MouseArea {
            id: mouseRegion
            hoverEnabled: false
            anchors.fill: parent; drag.target: parent
            drag.axis: Drag.XAxis; drag.minimumX: 0; drag.maximumX: slider.length
            preventStealing: true
            onPositionChanged: { slider.value = (slider.maximum - slider.minimum) * handle.x / slider.length + slider.minimum; }
        }
    }
}