dispose method

  1. @mustCallSuper
void dispose()

Call when the listener is no longer in use.

Do not use the object after calling dispose.

Subclasses must call this method in their overridden dispose, if any.

Implementation

@mustCallSuper
void dispose() {
  assert(_debugAssertNotDisposed());
  assert(debugMaybeDispatchDisposed(this));
  binding.removeObserver(this);
  assert(() {
    _debugDisposed = true;
    return true;
  }());
}