ConnectionStartContext<T> class

Context provided when starting a connection from a port.

This context is passed to validation callbacks when a user begins dragging a connection from a port. It provides information about the source node, port, and existing connections to help determine if the drag operation should be allowed.

Usage Example

ConnectionValidationResult validateStart<T>(
  ConnectionStartContext<T> context,
) {
  // Don't allow starting from a port that already has max connections
  if (!context.sourcePort.allowMultiple &&
      context.existingConnections.isNotEmpty) {
    return ConnectionValidationResult.deny(
      reason: 'Port already has a connection',
      showMessage: true,
    );
  }
  return ConnectionValidationResult.allow();
}