With the Slider from Qt Quick Controls:
import QtQuick 2.2
import QtQuick.Controls 1.1
import QtQuick.Controls.Styles 1.1
Item {
width: 400
height: 400
Slider {
anchors.centerIn: parent
style: SliderStyle {
handle: Image {
source: "http://icons.iconarchive.com/icons/custom-icon-design/pretty-office-9/256/square-icon.png"
width: 14
height: 14
}
}
}
}
See SliderStyle's documentation for more information.