fluffychat/lib/utils/event_checkbox_extension.dart

import 'package:matrix/matrix.dart';

extension EventCheckboxRoomExtension on Room {
  static const String relationshipType = 'im.fluffychat.checkboxes';
  Future<String?> checkCheckbox(
    String eventId,
    int checkboxId, {
    String? txid,
  }) =>
      sendEvent(
        {
          'm.relates_to': {
            'rel_type': relationshipType,
            'event_id': eventId,
            'checkbox_id': checkboxId,
          },
        },
        type: EventTypes.Reaction,
        txid: txid,
      );
}

extension EventCheckboxExtension on Event {
  int? get checkedCheckboxId => content
      .tryGetMap<String, Object?>('m.relates_to')
      ?.tryGet<int>('checkbox_id');
}