MouseWheelEventArgs.Delta

When MouseWheelEventArgs.DeltaPrecise returns -1.0f, MouseWheelEventArgs.Delta returns 0. The code in MouseDevice.cs look like this:

public float DeltaPrecise { get { return delta; } internal set { delta = value; } }
public int Delta { get { return (int)(delta + 0.5f); } }

which only do the wanted rounding when delta is positive. When delta is a negative integer, Delta will return delta + 1. The following code corrects this:

public int Delta { get { return  Convert.ToInt32(delta); } }

or

public int Delta { get { return delta > 0 ? (int)(delta + 0.5f) : (int)(delta - 0.5f); } }

A seach for 0.5f in MouseDevice.cs gives the the following hits:

public int Wheel
{
    get { return (int)(wheel + 0.5f); }
    internal set { WheelPrecise = value; }
}

public int WheelDelta
{
    get
    {
        int result = (int)(wheel - wheel_last_accessed + 0.5f);
        wheel_last_accessed = (int)wheel;
        return result;
    }
}

public int Value { get { return (int)(value + 0.5f); } }

I guess these (and explicit conversions in other files) should also be changed.

/John