public Collapse CollapseColumns(IEnumerable <int> columnArray)
{
Collapse collapse = new Collapse();
//search in every column
foreach (var column in columnArray)
{
//begin from bottom row
for (int row = 0; row < rows - 1; row++)
{
//if you find a null item
if (cells[row, column].IsEmpty)
{
//start searching for the first non-null
for (int row2 = row + 1; row2 < rows; row2++)
{
//if you find one, bring it down (i.e. replace it with the null you found)
if (!cells[row2, column].IsEmpty)
{
Cell cell1 = cells[row, column];
Cell cell2 = cells[row2, column];
//assign the item
cell1.SetItem(cell2.Item);
cell2.Clear();
//calculate the biggest distance
collapse.MaxDistance = Mathf.Max(row2 - row, collapse.MaxDistance);
collapse.AddCell(cell1);
break;
}
}
}
}
}
return(collapse);
}
