requestDeleteNode method

Future<bool> requestDeleteNode(String nodeId)

Requests deletion of a node with lock check and confirmation callback.

This async method:

1. Checks if deletion is allowed by current behavior
2. Checks if the node is locked (returns false if locked)
3. Calls onBeforeNodeDelete callback if provided (returns false if vetoed)
4. Removes the node if all checks pass

Use this method when you want to respect locks and confirmation dialogs. For direct removal without checks, use removeNode instead.

Returns true if the node was deleted, false if deletion was prevented.

Example:

final deleted = await controller.requestDeleteNode('node1');
if (!deleted) {
  print('Node deletion was prevented');
}

Implementation

Future<bool> requestDeleteNode(String nodeId) async {
  // Check behavior first
  if (!behavior.canDelete) return false;

  final node = _nodes[nodeId];
  if (node == null) return false;

  // Check if node is locked
  if (node.locked) return false;

  // Call before-delete callback if provided
  final callback = events.node?.onBeforeDelete;
  if (callback != null) {
    final allowed = await callback(node);
    if (!allowed) return false;
  }

  // Proceed with deletion
  removeNode(nodeId);
  return true;
}