public static void EnsureHierarchicalSource(ref List <HierarchicalRow> dataSource, int rows, int levels)
{
if (dataSource == null && !hierarchicalDataSourcesCache.TryGetValue(rows, out dataSource))
{
dataSource = new List <HierarchicalRow>(rows);
hierarchicalDataSourcesCache.Add(rows, dataSource);
}
if (dataSource.Count != rows)
{
dataSource.Clear();
int levelStep = (int)(Math.Log(rows, levels) + 0.5);
int levelBegin = 0; int levelEnd = levelStep - 1;
int parentLevelBegin = 0; int parentLevelEnd = 0;
for (int i = 0; i < rows; i++)
{
if (i == levelEnd)
{
parentLevelBegin = levelBegin;
parentLevelEnd = levelEnd;
levelEnd = levelBegin + (levelEnd - levelBegin) * levelStep;
levelBegin = i;
}
HierarchicalRow parent = null;
if (parentLevelBegin >= 0 && parentLevelEnd > 0)
{
int parentLevelSize = parentLevelEnd - parentLevelBegin;
parent = dataSource[parentLevelBegin + (i - levelBegin) % parentLevelSize];
}
dataSource.Add(HierarchicalRow.CreateHierarchicalRow(parent, i));
}
}
}
public static HierarchicalRow CreateHierarchicalRow(HierarchicalRow parent, int seed)
{
return((HierarchicalRow)CreateRow(seed, () => new HierarchicalRow(parent)));
}
