comunicmobile/lib/ui/widgets/like_widget.dart

import 'package:comunic/enums/likes_type.dart';
import 'package:comunic/helpers/likes_helper.dart';
import 'package:comunic/ui/widgets/safe_state.dart';
import 'package:comunic/utils/intl_utils.dart';
import 'package:flutter/material.dart';

/// Like widget
///
/// @author Pierre Hubert

/// Updated linking callback
/// int : new number of likes
/// bool : new user liking status
typedef UpdatedLikingCallBack = Function(int, bool);

class LikeWidget extends StatefulWidget {
  final LikesType likeType;
  final int likeID;
  int likesCount;
  bool isLiking;
  final UpdatedLikingCallBack onUpdatedLikings;

  LikeWidget({
    Key key,
    @required this.likeType,
    @required this.likeID,
    @required this.likesCount,
    @required this.isLiking,
    @required this.onUpdatedLikings,
  })  : assert(likeType != null),
        assert(likeID != null),
        assert(likesCount != null),
        assert(isLiking != null),
        assert(onUpdatedLikings != null),
        super(key: key);

  @override
  _LikeWidgetState createState() => _LikeWidgetState();
}

class _LikeWidgetState extends SafeState<LikeWidget> {
  String get _likeString {
    switch (widget.likesCount) {
      case 0:
        return tr("Like");

      case 1:
        return tr("1 Like");

      default:
        return tr("%num% likes", args: {"num": widget.likesCount.toString()});
    }
  }

  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.only(top: 4.0, bottom: 4.0),
      child: Align(
        alignment: AlignmentDirectional.topStart,
        child: Column(
          children: <Widget>[
            InkWell(
              onTap: () => _toggleLike(),
              child: Row(
                children: <Widget>[
                  Icon(
                    Icons.thumb_up,
                    color: widget.isLiking ? Colors.blue : null,
                    size: 15.0,
                  ),
                  SizedBox(
                    width: 8.0,
                  ),
                  Text(_likeString),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }

  /// Toggle like status
  void _toggleLike() async {
    // As like are not really important, we ignore failures
    if (await LikesHelper().setLiking(
        type: widget.likeType, like: !widget.isLiking, id: widget.likeID)) {
      setState(() {
        widget.isLiking = !widget.isLiking;

        widget.likesCount += widget.isLiking ? 1 : -1;

        widget.onUpdatedLikings(widget.likesCount, widget.isLiking);
      });
    }
  }
}