deactivate method

@protected @override @mustCallSuper void deactivate()

The framework calls this method whenever it removes this State object from the tree.

Implementation

@protected
@override
@mustCallSuper
void deactivate() {
  /// The framework calls this method whenever it removes this [State] object
  /// from the tree. It might reinsert it into another part of the tree.
  /// Subclasses should override this method to clean up any links between
  /// this object and other elements in the tree (e.g. if you have provided an
  /// ancestor with a pointer to a descendant's [RenderObject]).

  /// No 'setState()' functions are allowed to fully function at this point.
  _rebuildAllowed = false;
  for (final listener in _beforeList) {
    listener.deactivate();
  }
  for (final con in _controllerList) {
    // Don't call its deactivate if it's in other State objects.
    if (con._stateMVCSet.isEmpty) {
      con.deactivate();
    }
  }
  for (final listener in _beforeList) {
    listener.deactivate();
  }
  super.deactivate();
  _rebuildAllowed = true;

  /// In some cases, if then reinserted back in another part of the tree
  /// the build is called, and so setState() is not necessary.
  _rebuildRequested = false;

  _deactivated = true;
}