format method

@override BlockElement format(double availableWidth)

Converts this node into a BlockElement.

The inline content is laid out as a single left-to-right paragraph by Flutter, which takes care of line breaking, alignment, kerning and ligatures across differently styled spans.

All late variables must be initialized prior to calling this method.

Implementation

@override
BlockElement format(double availableWidth) {
  final blockWidth = availableWidth;
  final contentWidth = max(blockWidth - style.padding.horizontal, 0.0);
  final textAlign = style.textAlign ?? TextAlign.left;

  final paragraph = ParagraphTextElement.layout(
    child.toInlineSpan(),
    maxWidth: contentWidth,
    textAlign: textAlign,
  );
  final dx =
      style.padding.left +
      (contentWidth - paragraph.width) * _relativeOffset(textAlign);
  paragraph.translate(dx, style.padding.top);

  final blockHeight = paragraph.height + style.padding.vertical;
  final background = makeBackground(
    style.background,
    blockWidth,
    blockHeight,
  );
  final elements = background == null ? [paragraph] : [background, paragraph];
  return GroupElement(
    width: blockWidth,
    height: blockHeight,
    children: elements,
  );
}