method

listen

Source

/**
 * Adds a subscription to this stream.
 *
 * On each data event from this stream, the subscriber's [onData] handler
 * is called. If [onData] is null, nothing happens.
 *
 * On errors from this stream, the [onError] handler is given a
 * object describing the error.
 *
 * The [onError] callback must be of type `void onError(error)` or
 * `void onError(error, StackTrace stackTrace)`. If [onError] accepts
 * two arguments it is called with the stack trace (which could be `null` if
 * the stream itself received an error without stack trace).
 * Otherwise it is called with just the error object.
 *
 * If this stream closes, the [onDone] handler is called.
 *
 * If [cancelOnError] is true, the subscription is ended when
 * the first error is reported. The default is false.
 */
StreamSubscription<T> listen(void onData(T event),
                             { Function onError,
                               void onDone(),
                               bool cancelOnError});