Consider the following QML:
import QtQuick 2.4
import QtQuick.Controls 1.3
import QtQuick.Window 2.2
onValueChanged: console.log("value", value);
Move the slide handle and observe that:
1. You have to move mouse a few pixels before the handle starts following.
2. The logged numbers jump from 1 to about 800. If you want to select a value between that you have to move the slider back once it has started following the mouse.