fromHtml static method

List<ImageMapRegion> fromHtml(String data, [ Color? color ])

Implementation

static List<ImageMapRegion> fromHtml(
  String data, [
  Color? color,
]) {
  final regions = <ImageMapRegion>[];
  final areaMatches = RegExp(
    r'<area .+>',
    caseSensitive: false,
    multiLine: true,
  ).allMatches(data);

  final shapeRegex = RegExp(
    r'shape="([^"]+)"',
    caseSensitive: false,
  );
  final coordsRegex = RegExp(
    r'coords="([^"]+)"',
    caseSensitive: false,
  );
  final titleRegex = RegExp(
    r'title="([^"]+)"',
    caseSensitive: false,
  );
  final linkRegex = RegExp(
    r'href="([^"]+)"',
    caseSensitive: false,
  );

  final unescape = HtmlUnescape();

  for (final areaMatch in areaMatches) {
    final areaValue = areaMatch.group(0);
    if (areaValue == null) {
      continue;
    }
    final shapeMatch = shapeRegex.firstMatch(areaValue);
    final coordsMatch = coordsRegex.firstMatch(areaValue);
    if (shapeMatch == null || coordsMatch == null) {
      continue;
    }

    final titleMatch = titleRegex.firstMatch(areaValue);
    final titleText = titleMatch?.group(1);
    final title = titleText != null ? unescape.convert(titleText) : null;

    final linkMatch = linkRegex.firstMatch(areaValue);
    final link = linkMatch?.group(1);

    final shape = getImageMapShapeFromString(shapeMatch.group(1)!);
    final coords = coordsMatch
        .group(1)!
        .split(',')
        .map(double.parse)
        .toList(growable: false);

    switch (shape) {
      case ImageMapShape.rect:
        regions.add(
          ImageMapRegion.fromRect(
            rect: Rect.fromLTRB(
              coords[0],
              coords[1],
              coords[2],
              coords[3],
            ),
            color: color,
            title: title,
            link: link,
          ),
        );
        break;
      case ImageMapShape.poly:
        final offsets = <Offset>[];
        for (var i = 0; i < coords.length; i += 2) {
          final x = coords[i];
          final y = coords[i + 1];
          offsets.add(Offset(x, y));
        }
        regions.add(
          ImageMapRegion.fromPoly(
            points: offsets,
            color: color,
            title: title,
            link: link,
          ),
        );
        break;
      case ImageMapShape.circle:
        regions.add(
          ImageMapRegion.fromCircle(
            center: Offset(
              coords[0],
              coords[1],
            ),
            radius: coords[2],
            color: color,
            title: title,
            link: link,
          ),
        );
        break;
    }
  }

  return regions;
}