/// <summary>
/// Updates the column collection to match the row collection in the specific cell.
/// </summary>
/// <param name="reference">The cell reference.</param>
private void UpdateReferences(GridReference reference)
{
var col = this.Columns[reference.ColumnIndex].Cells[reference.RowIndex];
var row = this.Rows[reference.RowIndex].Cells[reference.ColumnIndex];
if (row.Known && col.Known)
{
// If they are both known, then blow up if they are different
if (row.Black != col.Black)
{
throw new Exception($"Two known cells in rows and cols have different values: ({reference.RowIndex},{reference.ColumnIndex})");
}
return;
}
else if (!row.Known && !col.Known)
{
// If neither are known then no changes to make
return;
}
if (col.Known)
{
// Column is known, so set the row value
row.Black = col.Black;
}
else
{
col.Black = row.Black;
}
}
/// <summary>
/// Sets the cell at the specified index to be black.
/// </summary>
/// <param name="reference">The cell reference.</param>
public void SetCellBlack(GridReference reference)
{
this.ValidateIndices(reference.RowIndex, reference.ColumnIndex);
this.Rows[reference.RowIndex].SetCellBlack(reference);
this.UpdateReferences(reference);
}
/// <summary>
/// Sets the cell at the specified index to be black.
/// </summary>
/// <param name="reference">The cell reference.</param>
public void SetCellBlack(GridReference reference)
{
this.Cells[reference.ColumnIndex].Black = true;
}