syncMultipleChildren method

void syncMultipleChildren(Map<TKey, List<TreeNode<TKey, TData>>> desiredByParent, { bool animate = true, })

Syncs children for multiple parents in a single batch.

This is the safe way to reparent nodes across parents when calling syncChildren directly (outside of syncRoots). The method pre-computes the union of all desired child keys so that removal of a node from its old parent is deferred when it is desired under a different parent, allowing TreeController.moveNode to preserve subtree state.

Set animate to false to suppress animations.

Implementation

void syncMultipleChildren(
  Map<TKey, List<TreeNode<TKey, TData>>> desiredByParent, {
  bool animate = true,
}) {
  _controller.runBatch(() {
    _globallyDesiredChildren = <TKey>{};
    try {
      for (final children in desiredByParent.values) {
        for (final c in children) {
          _globallyDesiredChildren!.add(c.key);
        }
      }
      for (final entry in desiredByParent.entries) {
        syncChildren(entry.key, entry.value, animate: animate);
      }
    } finally {
      _globallyDesiredChildren = null;
    }
  });
}