toggle method

void toggle()

Toggle expansion state (same as ElkNode).

Moves children between children and hiddenChildren. Also clears any partial expansion state on this node and descendants.

Implementation

void toggle() {
  if (isExpandable) {
    // Expand: move hidden children to visible
    children = hiddenChildren!;
    hiddenChildren = null;
  } else if (isExpanded) {
    // Collapse: move visible children to hidden
    clearDescendantMarks(children);
    hiddenChildren = children;
    children = [];
  }
  // Clear partial expansion on any full toggle
  partialChildIds = null;
  partialHyperedgeIds = null;
}