minimumSizeFor method

@override DiagramSize minimumSizeFor(FramedElement shape, Map<String, double> textHeights)

Implementation

@override
DiagramSize minimumSizeFor(
  FramedElement shape,
  Map<String, double> textHeights,
) {
  var fixed = 0.0, flex = 0.0, unit = 0.0, cross = 0.0, count = 0;
  for (final child in children) {
    final size = child.minimumSizeFor(shape, textHeights);
    if (_main(size) == 0 && _cross(size) == 0) continue;
    count++;
    cross = math.max(cross, _cross(size));
    if (child is ShapeSized && child.extent != null) {
      fixed += child.extent!;
    } else if (child is ShapeSized &&
        (child.textHeightSlot != null || child.contentHeightSlot != null)) {
      fixed += _main(size);
    } else {
      final weight = child is ShapeSized ? child.flex : 1.0;
      flex += weight;
      unit = math.max(unit, _main(size) / weight);
    }
  }
  final main = fixed + flex * unit + gap * math.max(0, count - 1);
  return horizontal ? DiagramSize(main, cross) : DiagramSize(cross, main);
}