Change Slider value on MouseWheel event.

[michaelmairegger]

Possibility to rotate the mouse wheel and change the value of the slider in following situations:
* None
* Only when the slider is focuesed and the mouse wheel is rotated
* If the mouse pointer is over the slider and the mouse wheel is rotated

[punker76]

we should always unregister the events

if (e.NewValue != e.OldValue)
{
    var slider = (Slider)d;
    UnregisterEvents(slider);
    if ((MouseWheelState)e.NewValue != MouseWheelState.None)
    {
        slider.Unloaded += OnUnloaded;
        slider.PreviewMouseWheel += OnPreviewMouseWheel;
    }
}

[thoemmi]

BTW, I would introduce RegisterEvents(Slider slider). Though it would be called only from one location, you would get symmetric methods, RegisterEvents and UnregisterEvents.

[punker76]

@thoemmi 👍

[michaelmairegger]

@thoemmi @punker76 Done 👍

[khteh]

Is there any change completion event for this mousewheel change of the slider value?