/// <summary>
/// Removes a registered callbacks by the token.
/// </summary>
/// <param name="token">The token of the registered callback.</param>
/// <remarks>If the token is not known anymore nothing happen.</remarks>
public void RemoveCallback(KeyboardWatchToken token)
{
if (_callbacks.ContainsKey(token))
_callbacks.Remove(token);
}
/// <summary>
/// Registers a callback which got called if one of the given keys changed their state to one of the given states.
/// </summary>
/// <param name="keys">The keys which has to be watched for.</param>
/// <param name="states">The key states which has to be watched for.</param>
/// <param name="callback">The callback to be called.</param>
/// <returns>A token which represends the current callback to be used for <see cref="DW.WPFToolkit.Helpers.KeyboardWatcher.RemoveCallback" />.</returns>
public KeyboardWatchToken AddCallback(IEnumerable<Key> keys, IEnumerable<KeyState> states, Action<KeyStateChangedArgs> callback)
{
var token = new KeyboardWatchToken();
var callbackItem = new KeyboardWatcherCallback
{
Callback = callback,
Keys = keys,
KeyStates = states,
Token = token
};
_callbacks[token] = callbackItem;
return token;
}
