discontinuedPackage jet_cad_floor_plan has been discontinued and replaced by jet_cad_2d_plan.

layerMoveCommand function

DraftCommand? layerMoveCommand(DraftDocument doc, Iterable<SelectionKey> keys, Handle layer)

The one command that moves keys to layer (spec 12b D12), or null when every member is already on it. Read from doc as it is now.

Per key:

• a root entity: SetEntityLayerCommand; a drafted region moves every record of it — from a fill, its boundary and every fill naming that boundary; from a boundary, every fill in fills.fillsOf(boundary);
• an ATTRIB: its owning instance, which then moves as below;
• an instance: SetInstanceLayerCommand;
• a parametric object: SetComponentCommand<ObjectLayer>.

Each member is moved once — the entity records first, then the instances, then the objects, each in key order; a member already on layer (exact == on the stored value; an object without an ObjectLayer is on layer 0) is skipped. One member left is its command alone; more are one CompoundCommand: one undo step either way. A plain group is not a member (the picker is disabled for it, layerPickerBlocked).

Implementation

DraftCommand? layerMoveCommand(
    DraftDocument doc, Iterable<SelectionKey> keys, Handle layer) {
  final entities = <Handle>{};
  final instances = <Handle>{};
  final objects = <Handle>{};
  final store = doc.entities;
  for (final k in keys) {
    final h = k.target;
    final node = doc.tree[h];
    if (node is InstanceNode) {
      instances.add(h);
      continue;
    }
    if (node is GroupNode) {
      if (isParametricObject(doc, h)) objects.add(h);
      continue;
    }
    if (node != null) continue;
    final slot = store.slotOf(h);
    if (slot == null) continue;
    if (_owningInstance(doc, slot) case final owner?) {
      instances.add(owner.handle);
      continue;
    }
    final boundary = _boundaryOfFill(doc, slot) ?? h;
    entities
      ..add(boundary)
      ..addAll(doc.fills.fillsOf(boundary));
    if (boundary != h) entities.add(h);
  }
  final commands = <DraftCommand>[
    for (final e in entities)
      if (store.layerAt(store.slotOf(e)!) != layer)
        SetEntityLayerCommand(e, layer),
    for (final i in instances)
      if ((doc.tree[i]! as InstanceNode).layer != layer)
        SetInstanceLayerCommand(i, layer),
    for (final o in objects)
      if ((doc.components.get<ObjectLayer>(o)?.layer ??
              ReservedHandles.layerZero) !=
          layer)
        SetComponentCommand<ObjectLayer>(o, ObjectLayer(layer)),
  ];
  return switch (commands.length) {
    0 => null,
    1 => commands.single,
    _ => CompoundCommand(commands, label: 'Move to layer'),
  };
}