detach method Null safety

  1. @override
void detach()
override

Mark this node as detached.

Typically called only from the parent's detach, and by the owner to mark the root of a tree as detached.

Subclasses with children should override this method to first call their inherited detach method, and then detach all their children.

Implementations of this method should end with a call to the inherited method, as in super.detach().

Implementation

@override
void detach() {
  super.detach();
  if (_rowDecorationPainters != null) {
    for (final BoxPainter? painter in _rowDecorationPainters!) {
      painter?.dispose();
    }
    _rowDecorationPainters = List<BoxPainter?>.filled(_rowDecorations!.length, null);
  }
  for (final RenderBox? child in _children) {
    child?.detach();
  }
}