format method

GroupElement format(DocumentStyle style, { double? width, double? height, })

Applies style to this document, producing an Element that can be rendered on a canvas. Parameters width and height serve as the fallback values if they were not specified in the style itself. However, they are ignored if style.width and style.height are provided.

Implementation

GroupElement format(DocumentStyle style, {double? width, double? height}) {
  assert(
    style.width != null || width != null,
    'Width must be either provided explicitly or set in the stylesheet',
  );
  final out = <TextElement>[];
  final border = style.background?.borderWidths ?? EdgeInsets.zero;
  final padding = style.padding;

  final pageWidth = style.width ?? width!;
  final contentWidth = pageWidth - padding.horizontal;
  final horizontalOffset = padding.left;
  var verticalOffset = border.top;
  var currentMargin = padding.top;
  for (final node in children) {
    node.fillStyles(style, style.text);
    final blockStyle = node.style;
    verticalOffset += collapseMargin(currentMargin, blockStyle.margin.top);
    final nodeElement = node.format(contentWidth);
    nodeElement.translate(horizontalOffset, verticalOffset);
    out.add(nodeElement);
    currentMargin = blockStyle.margin.bottom;
    verticalOffset += nodeElement.height;
  }
  final pageHeight = max(
    height ?? 0,
    verticalOffset +
        collapseMargin(currentMargin, padding.bottom) +
        border.bottom,
  );
  final background = makeBackground(
    style.background,
    pageWidth,
    pageHeight,
  );
  if (background != null) {
    out.insert(0, background);
  }
  return GroupElement(width: pageWidth, height: pageHeight, children: out);
}