Abstracting WPF's KeyEventArgs

IKeyEventArgs.cs

/// <summary>
/// Extracts the interesting parts of a <see cref="KeyEventArgs"/> so that we can mock it outside of the WPF runtime in a test.
/// </summary>
public interface IKeyEventArgs
{
    bool Handled { get; set; }
    object OriginalSource { get; }
    Key DeadCharProcessedKey { get; }
    Key ImeProcessedKey { get; }
    bool IsDown { get; }
    bool IsRepeat { get; }
    bool IsToggled { get; }
    bool IsUp { get; }
    Key Key { get; }
    KeyStates KeyStates { get; }
    Key SystemKey { get; }
}

KeyEventArgsWrapper.cs

/// <summary>
/// Wraps the interesting parts of a <see cref="KeyEventArgs"/> so that we can instantiate it outside of the WPF runtime in a test.
/// </summary>
public class KeyEventArgsWrapper : IKeyEventArgs
{
    KeyEventArgs e;

    public KeyEventArgsWrapper(KeyEventArgs e)
    {
        this.e = e;
    }

    public bool Handled
    {
        get { return e.Handled; }
        set { e.Handled = value; }
    }

    public object OriginalSource { get { return e.OriginalSource; } }
    public Key DeadCharProcessedKey { get { return e.DeadCharProcessedKey; } }
    public Key ImeProcessedKey { get { return e.ImeProcessedKey; } }
    public bool IsDown { get { return e.IsDown; } }
    public bool IsRepeat { get { return e.IsRepeat; } }
    public bool IsToggled { get { return e.IsToggled; } }
    public bool IsUp { get { return e.IsUp; } }
    public Key Key { get { return e.Key; } }
    public KeyStates KeyStates { get { return e.KeyStates; } }
    public Key SystemKey { get { return e.SystemKey; } }
}