QtQuick Slider: Style: Handle: mouse area size

[jseideman]

Current Problem: The Slider can't reach its full range:
Original Problem: The slider handle needed a larger "mouseArea" for easier use on a touch screen.
First Cut Solution: I met with Jens at the Digia booth at SF Developer days and he came up with this solution:
A larger Item wrapped around the visible handle. This solved the problem, but now prevents the slider from using its full range (since the larger item is now considered to be the actual handle). I tried changing the min/max, but that didn't fix it. Here's the code:

Slider
{
id: gammaSlider
objectName: "gammaSlider"
anchors
{
horizontalCenter: gammaValueLabel.horizontalCenter
topMargin: labelMargin
top: gammaValueLabel.bottom
bottom: histogramContainer.bottom
}

        orientation: Qt.Vertical
        minimumValue: 0
        maximumValue: transformController.mGetSliderMaxValue()
        stepSize: transformController.mGetSliderStepSize()
        style: SliderStyle {
                groove: Rectangle {
                    color: kMainColor
                    implicitWidth: 16
                    implicitHeight: 7
                    radius: 4
                }
                //nesting yields extra MouseArea
                handle: Item {
                    width: 56
                    height: 56
                    Rectangle {
                        anchors.centerIn: parent
                        color: "gray"
                        border.color: controlOrange
                        border.width: 2
                        width: 26
                        height: 26
                        radius: 13
                    }
                }
        }
        onValueChanged:
        {
            onGammaSliderChanged(value);
        }
    }