paint method

Implementation

@override
String paint() {
  if (children.isEmpty) return '';
  final targetWidth = size.width.toInt();
  final targetHeight = size.height.toInt();
  if (targetWidth == 0 || targetHeight == 0) return '';

  final canvas = Canvas(targetWidth, targetHeight);
  final bgStyle = const UvStyle();

  var isFirstChild = true;
  for (final child in children) {
    final content = child.paint();
    final childWidth = child.size.width.toInt();
    final childHeight = child.size.height.toInt();
    final x = child.offset.dx.toInt();
    final y = child.offset.dy.toInt();

    if (isFirstChild &&
        x == 0 &&
        y == 0 &&
        childWidth == targetWidth &&
        childHeight == targetHeight) {
      // First child fills the entire canvas — draw StyledString directly
      // onto the main canvas, skipping the temp canvas + cell-by-cell copy.
      StyledString(content).draw(canvas, canvas.bounds());
    } else {
      _drawStyledContent(
        canvas,
        content,
        x,
        y,
        bgStyle,
        transparent: !isFirstChild,
      );
    }
    isFirstChild = false;
  }

  var result = canvas.render();
  result = _padToStackSize(result, targetWidth, targetHeight);
  return result;
}