discontinuedPackage jet_cad_floor_plan has been discontinued and replaced by jet_cad_2d_plan.

apply method

@override CommandResult apply(CommandTarget target)

Applies the change and returns its inverse plus the handles it touched. Must either complete fully or leave the target unmutated.

Implementation

@override
CommandResult apply(CommandTarget target) {
  final r = inner.apply(target);
  final inverses = <DraftCommand>[];
  final written = <Handle>{};
  var stamps = 0;
  try {
    for (final h in r.touched) {
      final DraftCommand derived;
      if (_stampFor(target, h) case final stamp?) {
        derived = stamp;
        stamps++;
      } else {
        continue;
      }
      final result = derived.apply(target);
      inverses.add(result.inverse);
      written.addAll(result.touched);
    }
  } catch (_) {
    // All or nothing: the stamps written so far, then the edit itself.
    for (final inverse in inverses.reversed) {
      inverse.apply(target);
    }
    r.inverse.apply(target);
    rethrow;
  }
  _stamped = stamps > 0;
  if (inverses.isEmpty) return r;
  // A replay with the edit's own authority: undo and redo need exactly
  // what the edit needed, not the stamps' `geometry` (review R-5).
  return CommandResult(
    inverse: ParametricReplay(
        CompoundCommand([...inverses.reversed, r.inverse], label: label),
        inner.capabilities),
    touched: {...r.touched, ...written},
  );
}