TableCellListDelegate constructor

TableCellListDelegate({ int pinnedColumnCount = 0, int pinnedRowCount = 0, bool addAutomaticKeepAlives = true, required List<List<TableViewCell>> cells, required TableSpanBuilder columnBuilder, required TableSpanBuilder rowBuilder, })

Creates a delegate that supplies children for a TableView.

Implementation

TableCellListDelegate({
  int pinnedColumnCount = 0,
  int pinnedRowCount = 0,
  super.addAutomaticKeepAlives,
  required List<List<TableViewCell>> cells,
  required TableSpanBuilder columnBuilder,
  required TableSpanBuilder rowBuilder,
})  : assert(pinnedColumnCount >= 0),
      assert(pinnedRowCount >= 0),
      _columnBuilder = columnBuilder,
      _rowBuilder = rowBuilder,
      _pinnedColumnCount = pinnedColumnCount,
      _pinnedRowCount = pinnedRowCount,
      super(
        children: cells,
        // repaintBoundaries handled by TableViewCell
        addRepaintBoundaries: false,
      ) {
  // Even if there are merged cells, they should be represented by the same
  // child in each cell location. This ensures that no matter which direction
  // the merged cell scrolls into view from, we can build the correct child
  // without having to explore all possible vicinities of the merged cell
  // area. So all arrays of cells should have the same length.
  assert(
    children.map((List<Widget> array) => array.length).toSet().length == 1,
    'Each list of Widgets within cells must be of the same length.',
  );
  assert(rowCount >= pinnedRowCount);
  assert(columnCount >= pinnedColumnCount);
}