moveSelection method

void moveSelection(int dr, int dc, { bool grow = false, })

Move the cursor by (dr, dc). When grow and the move runs off the last row, a new blank row is appended (needs newRow).

Implementation

void moveSelection(int dr, int dc, {bool grow = false}) {
  if (_editing) _editing = false;
  var r = _sel.row + dr;
  var c = _sel.col + dc;
  if (c < 0) {
    c = colCount - 1;
    r -= 1;
  }
  if (c >= colCount) {
    c = 0;
    r += 1;
  }
  if (r >= rowCount && grow && newRow != null) {
    _apply(List<T>.from(_rows)..add(newRow!()));
    r = rowCount - 1;
  }
  r = r.clamp(0, rowCount - 1);
  c = c.clamp(0, colCount - 1);
  final next = CellRef(r, c);
  if (next == _sel) {
    notifyListeners();
    return;
  }
  _sel = next;
  notifyListeners();
}