GroupAnnotation class

A group annotation that automatically surrounds and contains a set of nodes.

Group annotations create visual boundaries around related nodes, making it easier to organize complex workflows. They feature:

• Automatic sizing based on contained nodes
• Customizable title and color
• Automatic position updates when nodes move
• Support for moving all contained nodes together
• Typically rendered behind nodes (negative z-index)

Groups maintain node dependencies and automatically recalculate their bounds when dependent nodes are moved, resized, or added/removed.

Example

final group = controller.annotations.createGroupAnnotation(
  id: 'group-1',
  title: 'Data Processing',
  nodeIds: {'node1', 'node2', 'node3'},
  nodes: controller.nodes,
  color: Colors.blue,
  padding: EdgeInsets.all(20),
);
controller.annotations.addAnnotation(group);