focusUp method

void focusUp()

Implementation

void focusUp() {
  // print(indexWithFocus);
  if (indexWithFocus == Index(-1, -1)) return;
  if (indexWithFocus.row != 0)
    indexWithFocus = Index(indexWithFocus.row - 1, indexWithFocus.column);
  cellSelection.clear();
  cellSelection.add(indexWithFocus);
  rowSelection.clear();
  rowSelection.add(indexWithFocus.row);
  columnSelection.clear();
  columnSelection.add(indexWithFocus.column);
  selectionChanged?.call();
}