///<summary>
/// GridVirtualRowList
///</summary>
///<param name="container"></param>
public GridVirtualRows(GridContainer container)
{
_Container = container;
_PageBuckets = new VPageBucket[MaxBuckets];
_PageBuckets[0] = new VPageBucket(_Container, 0);
}
private void TruncateRowIndex(int index)
{
_LastAccessedBucket = null;
for (int i = 0; i < MaxBuckets; i++)
{
int n = (_BucketHead + i) % MaxBuckets;
if (_PageBuckets[n] != null)
{
if (_PageBuckets[n].StartIndex >= index)
_PageBuckets[n] = null;
else if (_PageBuckets[n].EndIndex > index)
{
for (int j = 0; j < MaxRows; j++)
{
if (_PageBuckets[n].StartIndex + j > index)
_PageBuckets[n].Rows[j] = null;
}
}
}
}
}
///<summary>
/// Clear
///</summary>
public void Clear()
{
for (int i = 0; i < MaxBuckets; i++)
{
if (_PageBuckets[i] != null)
_PageBuckets[i].Reset(null, 0);
_PageBuckets[i] = null;
}
_BucketHead = 0;
_LastAccessedBucket = null;
}
private GridRow NewBucketRow(int n, int index)
{
int startIndex = (index / MaxRows) * MaxRows;
if (_PageBuckets[n] != null)
_PageBuckets[n].Reset(_Container, startIndex);
else
_PageBuckets[n] = new VPageBucket(_Container, startIndex);
_LastAccessedBucket = _PageBuckets[n];
return (_LastAccessedBucket[index]);
}
private GridRow GetRow(int index)
{
if (_LastAccessedBucket != null)
{
if (_LastAccessedBucket.Contains(index))
return (_LastAccessedBucket[index]);
}
for (int i = 0; i < MaxBuckets; i++)
{
int n = (_BucketHead + i) % MaxBuckets;
if (_PageBuckets[n] == null)
return (NewBucketRow(n, index));
if (_PageBuckets[n].Contains(index))
{
_LastAccessedBucket = _PageBuckets[n];
return (_LastAccessedBucket[index]);
}
}
int bucket = _BucketHead;
GridPanel panel = _Container.GridPanel;
if (panel != null)
{
for (int i = 0; i < MaxBuckets; i++)
{
bucket = (_BucketHead + i) % MaxBuckets;
if (panel.FrozenRowCount > 0)
{
if (_PageBuckets[bucket].Contains(0))
continue;
}
if (panel.ActiveRow != null)
{
if (_PageBuckets[bucket].Contains(panel.ActiveRow.Index))
continue;
}
break;
}
}
_BucketHead = (bucket + 1) % MaxBuckets;
return (NewBucketRow(bucket, index));
}