Function layoutBlocksCore

apps/sim/lib/workflows/autolayout/core.ts:393–432

(
  blocks: Record<string, BlockState>,
  edges: Edge[],
  options: {
    isContainer: boolean
    layoutOptions?: LayoutOptions
    subflowDepths?: Map<string, number>
  }
)

 * @returns The laid-out nodes with updated positions, and bounding dimensions
 */
export function layoutBlocksCore(
  blocks: Record<string, BlockState>,
  edges: Edge[],
  options: {
    isContainer: boolean
    layoutOptions?: LayoutOptions
    subflowDepths?: Map<string, number>
  }
): { nodes: Map<string, GraphNode>; dimensions: { width: number; height: number } } {
  if (Object.keys(blocks).length === 0) {
    return { nodes: new Map(), dimensions: { width: 0, height: 0 } }
  }

  const layoutOptions: LayoutOptions =
    options.layoutOptions ??
    (options.isContainer ? CONTAINER_LAYOUT_OPTIONS : DEFAULT_LAYOUT_OPTIONS)

  // 1. Assign layers (with subflow depth adjustment for subflow end edges)
  const nodes = assignLayers(blocks, edges, options.subflowDepths)

  // 2. Prepare metrics
  prepareBlockMetrics(nodes)

  // 3. Group by layer
  const layers = groupByLayer(nodes)

  // 4. Calculate positions (pass edges for handle offset calculations)
  calculatePositions(layers, edges, layoutOptions)

  // 5. Normalize positions
  let dimensions = normalizePositions(nodes, { isContainer: options.isContainer })

  // 6. Snap to grid if gridSize is specified (recalculates dimensions)
  const snappedDimensions = snapNodesToGrid(nodes, layoutOptions.gridSize)
  if (snappedDimensions) {
    dimensions = snappedDimensions
  }

  return { nodes, dimensions }
}