useConstraints

useConstraints() provides selection-derived horizontal and vertical constraint state plus undo-aware actions.

ts

import { useConstraints } from '@open-pencil/vue'

const constraints = useConstraints()
constraints.setAxis('horizontal', 'STRETCH')
constraints.togglePin('vertical', 'trailing', false)

active requires every selected node to be an eligible child of a frame-like container.
horizontal and vertical return MIN, CENTER, MAX, STRETCH, SCALE, or MIXED.
Multi-selection updates are grouped into one undo entry.
Normal auto-layout children are excluded; absolutely positioned children remain eligible.

Use constraintPins() and toggleConstraintPin() to build a custom accessible pin diagram without duplicating mode mapping.