void updateNode({int id, int flags, int actions, Rect rect, String label, Float64List transform, Int32List children })

Update the information associated with the node with the given id.

The semantics nodes form a tree, with the root of the tree always having an id of zero. The children are the ids of the nodes that are immediate children of this node. The system retains the nodes that are currently reachable from the root. A given update need not contain information for nodes that do not change in the update. If a node is not reachable from the root after an update, the node will be discarded from the tree.

The flags are a bit field of SemanticsFlags that apply to this node.

The actions are a bit field of SemanticsActions that can be undertaken by this node. If the user wishes to undertake one of these actions on this node, the Window.onSemanticsAction will be called with id and one of the possible SemanticsActions. Because the semantics tree is maintained asynchronously, the Window.onSemanticsAction callback might be called with an action that is no longer possible.

The label is a string that describes this node.

The rect is the region occupied by this node in its own coordinate system.

The transform is a matrix that maps this node's coodinate system into its parent's coordate system.

Source 

void updateNode({
  int id,
  int flags,
  int actions,
  Rect rect,
  String label,
  Float64List transform,
  Int32List children
}) {
  if (transform.length != 16)
    throw new ArgumentError("[transform] must have 16 entries.");
  _updateNode(id,
              flags,
              actions,
              rect.left,
              rect.top,
              rect.right,
              rect.bottom,
              label,
              transform,
              children);
}