operator [] method

Implementation

@override
Attachment? operator [](int index) {
  if (index < 0 || index >= length) {
    throw RangeError.index(index, this, 'index');
  }
  final buffer = SpineBindings.bindings.spine_array_attachment_buffer(nativePtr.cast());
  if (buffer[index].address == 0) return null;
  final rtti = SpineBindings.bindings.spine_attachment_get_rtti(buffer[index]);
  final className = SpineBindings.bindings.spine_rtti_get_class_name(rtti).cast<Utf8>().toDartString();
  switch (className) {
    case 'BoundingBoxAttachment':
      final castedPtr = SpineBindings.bindings.spine_attachment_cast_to_bounding_box_attachment(buffer[index]);
      return BoundingBoxAttachment.fromPointer(castedPtr);
    case 'ClippingAttachment':
      final castedPtr = SpineBindings.bindings.spine_attachment_cast_to_clipping_attachment(buffer[index]);
      return ClippingAttachment.fromPointer(castedPtr);
    case 'MeshAttachment':
      final castedPtr = SpineBindings.bindings.spine_attachment_cast_to_mesh_attachment(buffer[index]);
      return MeshAttachment.fromPointer(castedPtr);
    case 'PathAttachment':
      final castedPtr = SpineBindings.bindings.spine_attachment_cast_to_path_attachment(buffer[index]);
      return PathAttachment.fromPointer(castedPtr);
    case 'PointAttachment':
      final castedPtr = SpineBindings.bindings.spine_attachment_cast_to_point_attachment(buffer[index]);
      return PointAttachment.fromPointer(castedPtr);
    case 'RegionAttachment':
      final castedPtr = SpineBindings.bindings.spine_attachment_cast_to_region_attachment(buffer[index]);
      return RegionAttachment.fromPointer(castedPtr);
    default:
      throw UnsupportedError('Unknown concrete type: $className for abstract class Attachment');
  }
}