performAction method

void performAction (int id, SemanticsAction action, [ dynamic args ])

Asks the SemanticsNode with the given id to perform the given action.

If the SemanticsNode has not indicated that it can perform the action, this function does nothing.

If the given action requires arguments they need to be passed in via the args parameter.

Implementation 

void performAction(int id, SemanticsAction action, [dynamic args]) {
  assert(action != null);
  final _SemanticsActionHandler handler = _getSemanticsActionHandlerForId(id, action);
  if (handler != null) {
    handler(args);
    return;
  }

  // Default actions if no [handler] was provided.
  if (action == SemanticsAction.showOnScreen && _nodes[id]._showOnScreen != null)
    _nodes[id]._showOnScreen();
}