tryFromItem static method

PaperFormat? tryFromItem(PrintStoreItem item)

Returns null when the stored data is incomplete or out of range.

Implementation

static PaperFormat? tryFromItem(PrintStoreItem item) {
  final data = item.data;
  final feed = PaperFeed.values
      .where((value) => value.name == data['feed'])
      .firstOrNull;
  double number(String key) => (data[key] as num?)?.toDouble() ?? 0;
  int count(String key) => (data[key] as num?)?.toInt() ?? 0;
  if (feed == null) return null;
  final format = PaperFormat(
    id: item.id,
    name: item.name,
    feed: feed,
    pageWidthMm: number('page_width_mm'),
    pageHeightMm: number('page_height_mm'),
    columns: feed == PaperFeed.roll ? 1 : count('columns'),
    rows: feed == PaperFeed.roll ? 1 : count('rows'),
    cellWidthMm: number('cell_width_mm'),
    cellHeightMm: number('cell_height_mm'),
    marginTopMm: number('margin_top_mm'),
    marginLeftMm: number('margin_left_mm'),
    gapXMm: number('gap_x_mm'),
    gapYMm: number('gap_y_mm'),
  );
  return format.validationError == null ? format : null;
}