public void IgnoresMoveBeyondLowerBounds()
{
var set = CreateTestSet();
var changeSpec = new SortOrderChangeSpecification { From = 1, To = 0 };
set.ChangeSortOrder(changeSpec);
AssertSort(set, 1, "A");
AssertSort(set, 2, "B");
AssertSort(set, 3, "C");
AssertSort(set, 4, "D");
AssertSort(set, 5, "E");
}
public void IgnoresInvalidFrom()
{
var set = CreateTestSet();
var changeSpec = new SortOrderChangeSpecification { From = 6, To = 1 };
set.ChangeSortOrder(changeSpec);
AssertSort(set, 1, "A");
AssertSort(set, 2, "B");
AssertSort(set, 3, "C");
AssertSort(set, 4, "D");
AssertSort(set, 5, "E");
}
/// <summary>
/// Changes the sort order of the entities in the list according to the specified change.
/// </summary>
/// <param name="source">The source.</param>
/// <param name="specification">The specification.</param>
public static void ChangeSortOrder(this IQueryable<ISortOrderedEntity> source, SortOrderChangeSpecification specification)
{
if (specification.To == specification.From)
return;
if (specification.To < source.Min(s => s.SortOrder) || specification.To > source.Max(s => s.SortOrder) )
return;
var itemToMove = source.FirstOrDefault(s => s.SortOrder == specification.From);
if (itemToMove != null)
{
if (specification.From > specification.To)
source.Where(s => s.SortOrder >= specification.To && s.SortOrder < specification.From)
.ToList().ForEach(s => s.SortOrder++);
else
source.Where(s => s.SortOrder <= specification.To && s.SortOrder > specification.From)
.ToList().ForEach(s => s.SortOrder--);
itemToMove.SortOrder = specification.To;
}
}
public void MovesUp()
{
var set = CreateTestSet();
var changeSpec = new SortOrderChangeSpecification { From = 4, To = 2 };
set.ChangeSortOrder(changeSpec);
AssertSort(set, 1, "A");
AssertSort(set, 2, "D");
AssertSort(set, 3, "B");
AssertSort(set, 4, "C");
AssertSort(set, 5, "E");
}