operator [] method

Implementation

@override
Constraint? operator [](int index) {
  if (index < 0 || index >= length) {
    throw RangeError.index(index, this, 'index');
  }
  final buffer = SpineBindings.bindings.spine_array_constraint_buffer(nativePtr.cast());
  if (buffer[index].address == 0) return null;
  final rtti = SpineBindings.bindings.spine_constraint_get_rtti(buffer[index]);
  final className = SpineBindings.bindings.spine_rtti_get_class_name(rtti).cast<Utf8>().toDartString();
  switch (className) {
    case 'IkConstraint':
      final castedPtr = SpineBindings.bindings.spine_constraint_cast_to_ik_constraint(buffer[index]);
      return IkConstraint.fromPointer(castedPtr);
    case 'PathConstraint':
      final castedPtr = SpineBindings.bindings.spine_constraint_cast_to_path_constraint(buffer[index]);
      return PathConstraint.fromPointer(castedPtr);
    case 'PhysicsConstraint':
      final castedPtr = SpineBindings.bindings.spine_constraint_cast_to_physics_constraint(buffer[index]);
      return PhysicsConstraint.fromPointer(castedPtr);
    case 'Slider':
      final castedPtr = SpineBindings.bindings.spine_constraint_cast_to_slider(buffer[index]);
      return Slider.fromPointer(castedPtr);
    case 'TransformConstraint':
      final castedPtr = SpineBindings.bindings.spine_constraint_cast_to_transform_constraint(buffer[index]);
      return TransformConstraint.fromPointer(castedPtr);
    default:
      throw UnsupportedError('Unknown concrete type: $className for abstract class Constraint');
  }
}