constructor Table

Source

Table({
  Key key,
  List<TableRow> children: const <TableRow>[],
  this.columnWidths,
  this.defaultColumnWidth: const FlexColumnWidth(1.0),
  this.border,
  this.defaultVerticalAlignment: TableCellVerticalAlignment.top,
  this.textBaseline
}) : children = children,
     _rowDecorations = children.any((TableRow row) => row.decoration != null)
                       ? children.map/*<Decoration>*/((TableRow row) => row.decoration).toList(growable: false)
                       : null,
     super(key: key) {
  assert(children != null);
  assert(defaultColumnWidth != null);
  assert(defaultVerticalAlignment != null);
  assert(() {
    if (children.any((TableRow row) => row.children.any((Widget cell) => cell == null))) {
      throw new FlutterError(
        'One of the children of one of the rows of the table was null.\n'
        'The children of a TableRow must not be null.'
      );
    }
    return true;
  });
  assert(() {
    List<Widget> flatChildren = children.expand((TableRow row) => row.children).toList(growable: false);
    if (debugChildrenHaveDuplicateKeys(this, flatChildren)) {
      throw new FlutterError(
        'Two or more cells in this Table contain widgets with the same key.\n'
        'Every widget child of every TableRow in a Table must have different keys. The cells of a Table are '
        'flattened out for processing, so separate cells cannot have duplicate keys even if they are in '
        'different rows.'
      );
    }
    return true;
  });
  assert(() {
    if (children.any((TableRow row1) => row1.key != null && children.any((TableRow row2) => row1 != row2 && row1.key == row2.key))) {
      throw new FlutterError(
        'Two or more TableRow children of this Table had the same key.\n'
        'All the keyed TableRow children of a Table must have different Keys.'
      );
    }
    return true;
  });
  assert(() {
    if (children.isNotEmpty) {
      final int cellCount = children.first.children.length;
      if (children.any((TableRow row) => row.children.length != cellCount)) {
        throw new FlutterError(
          'Table contains irregular row lengths.\n'
          'Every TableRow in a Table must have the same number of children, so that every cell is filled. '
          'Otherwise, the table will contain holes.'
        );
      }
    }
    return true;
  });
}