didUpdateWidget method

@protected @override @mustCallSuper void didUpdateWidget(covariant StatefulWidget oldWidget)

Override this method to respond when its StatefulWidget is re-created. The framework always calls build after calling didUpdateWidget, which means any calls to setState in didUpdateWidget are redundant.

Implementation

@protected
@override
@mustCallSuper
void didUpdateWidget(StatefulWidget oldWidget) {
  /// No 'setState()' functions are allowed
  _setStateAllowed = false;
  for (final listener in _beforeList) {
    listener.didUpdateWidget(oldWidget);
  }
  for (final con in _controllerList) {
    con.didUpdateWidget(oldWidget);
  }
  for (final listener in _afterList) {
    listener.didUpdateWidget(oldWidget);
  }
  super.didUpdateWidget(oldWidget);

  /// Re-enable setState() function
  _setStateAllowed = true;

  /// No 'setState()' functions are necessary
  _setStateRequested = false;
}