blockBuilder method

Widget blockBuilder(BuildContext context, Block block)

Implementation

Widget blockBuilder(BuildContext context, Block block) {
  Text textView;
  var textTheme = Theme.of(context).textTheme;
  TextStyle textStyle;
  switch (block.type) {
    case BlockType.h1:
      textStyle = textTheme.displayLarge ?? defaultStyle;
      break;
    case BlockType.h2:
      textStyle = textTheme.displayMedium ?? defaultStyle;
      break;
    case BlockType.h3:
      textStyle = textTheme.displaySmall ?? defaultStyle;
      break;
    case BlockType.h4:
      textStyle = textTheme.headlineMedium ?? defaultStyle;
      break;
    case BlockType.h5:
      textStyle = textTheme.headlineSmall ?? defaultStyle;
      break;
    case BlockType.h6:
      textStyle = textTheme.titleLarge ?? defaultStyle;
      break;
    case BlockType.code:
      textStyle = defaultStyle.copyWith(fontWeight: FontWeight.w500, color: Colors.grey.shade700);
      break;
    case BlockType.quote:
      textStyle = TextStyle(
        fontSize: 14,
        color: Colors.grey.shade600,
        fontStyle: FontStyle.italic,
        fontWeight: FontWeight.w500,
      );
      break;
    default:
      textStyle = textTheme.bodyMedium ?? defaultStyle;
      break;
  }
  if (block.inlineStyle.isNotEmpty) {
    var styleMap = block.textStyleMap(textStyle);
    textView = Text.rich(
        TextSpan(children: styleMap.map((entry) => TextSpan(text: entry.key, style: entry.value)).toList()),
        textAlign: block.data.textAlign);
  } else {
    textView = Text(block.text, style: textStyle, textAlign: block.data.textAlign);
  }
  if (!block.data.isEmpty && block.data.textIndent != 0) {
    return Padding(
      padding: EdgeInsets.only(left: TextUtil.measureText('缩进', textStyle).width * block.data.textIndent),
      child: textView,
    );
  }
  // 引用块
  if (block.type == BlockType.quote) {
    return Container(
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
          color: Colors.grey.shade100, border: Border(left: BorderSide(color: Colors.grey.shade300, width: 5))),
      child: textView,
    );
  }
  if (block.type == BlockType.code) {
    return Container(
      padding: const EdgeInsets.all(12),
      color: Colors.grey.shade100,
      child: SingleChildScrollView(
        scrollDirection: Axis.horizontal,
        child: textView,
      ),
    );
  }
  // 无序列表
  if (block.type == BlockType.bulletList) {
    var size = TextUtil.measureText('缩进', textStyle);
    double dotSize = 5;
    const solid = BoxDecoration(color: Colors.black, shape: BoxShape.circle);
    var hollow = BoxDecoration(shape: BoxShape.circle, border: Border.all(color: Colors.black));
    Widget dot = Container(
      width: dotSize,
      height: dotSize,
      margin: EdgeInsets.only(right: dotSize),
      decoration: block.depth > 0 ? hollow : solid,
    );
    return Row(
      mainAxisAlignment: MainAxisAlignment.start,
      children: [
        SizedBox.fromSize(
          size: Size(size.width * block.depth + dotSize * 2, size.height),
          child: Align(alignment: Alignment.centerRight, child: dot),
        ),
        textView,
      ],
    );
  }
  if (block.type == BlockType.numberList) {
    var size = TextUtil.measureText('缩进', textStyle);
    Text numberView = Text('${block.data.number}.', style: textStyle);
    return Row(
      crossAxisAlignment: CrossAxisAlignment.start,
      mainAxisAlignment: MainAxisAlignment.start,
      children: [
        SizedBox.fromSize(
          size: Size(size.width * block.depth + size.width / 2, size.height),
          child: Align(alignment: Alignment.centerRight, child: numberView),
        ),
        Expanded(child: textView),
      ],
    );
  }
  if (block.entityRanges.isNotEmpty) {
    List<Widget> children = [];
    String text = block.text;
    var entityMap = data.entityMap;
    for (var range in block.entityRanges) {
      var entity = entityMap["${range.key}"];
      if (entity == null) continue;
      switch (entity.type) {
        case EntityType.image:
          Image image = Image.network(
            entity.data.url!,
            width: MediaQuery.of(context).size.width,
            fit: BoxFit.scaleDown,
          );
          children.add(image);
          if (entity.data.name?.isNotEmpty ?? false) {
            children.add(Text(entity.data.name!, style: textStyle, textAlign: TextAlign.center));
          }
          break;
        case EntityType.divider:
          Divider divider = const Divider();
          children.add(divider);
          break;
        case EntityType.link:
          textView = Text.rich(
            TextSpan(
              children: [
                TextSpan(text: text.substring(0, range.offset)),
                TextSpan(
                  text: text.substring(range.offset, range.offset + range.length),
                  style: textStyle.copyWith(color: Colors.blue, decoration: TextDecoration.underline),
                  recognizer: TapGestureRecognizer()..onTap = () => onLinkTab?.call(entity.data.url ?? ""),
                ),
                TextSpan(text: text.substring(range.offset + range.length)),
              ],
            ),
            textAlign: block.data.textAlign,
          );
          children.add(textView);
          break;
      }
    }
    return Column(
      mainAxisSize: MainAxisSize.min,
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: children,
    );
  }
  return textView;
}