internal QueryGroupsEventArgs(
DataGridVirtualizingCollectionView collectionView,
DataGridVirtualizingCollectionViewGroup parentGroup,
GroupDescription childGroupDescription)
{
m_dataGridVirtualizingCollectionView = collectionView;
m_readonlyGroupPath = parentGroup.GroupPath.AsReadOnly();
m_childGroupDescription = childGroupDescription;
this.ChildGroupPropertyName = DataGridCollectionViewBase.GetPropertyNameFromGroupDescription(childGroupDescription);
m_sortDirection = SortDirection.None;
SortDescriptionCollection sortDescriptions = m_dataGridVirtualizingCollectionView.SortDescriptions;
int sortDescriptionCount = (sortDescriptions == null) ? 0 : sortDescriptions.Count;
for (int i = 0; i < sortDescriptions.Count; i++)
{
SortDescription sortDescription = sortDescriptions[i];
if (string.Equals(sortDescription.PropertyName, this.ChildGroupPropertyName))
{
m_sortDirection = (sortDescription.Direction == ListSortDirection.Ascending) ? SortDirection.Ascending : SortDirection.Descending;
break;
}
}
m_childGroupNameCountPairs = new List <GroupNameCountPair>();
}
internal override ObservableCollection <object> QuerySubCollectionViewGroupList(GroupDescription subGroupBy, int nextLevel, bool nextLevelIsBottom)
{
DataGridVirtualizingCollectionView collectionView = this.GetCollectionView() as DataGridVirtualizingCollectionView;
Debug.Assert(collectionView != null);
List <GroupNameCountPair> subGroupInfos = collectionView.OnQueryGroups(this);
int subGroupCount = subGroupInfos.Count;
// Create the collection of sub CollectionViewGroups
ObservableCollection <object> subCollectionViewGroupList = new ObservableCollection <object>();
int runningCount = this.StartGlobalIndex;
for (int i = 0; i < subGroupCount; i++)
{
object subGroupName = subGroupInfos[i].Name;
int subGroupItemCount = subGroupInfos[i].ItemCount;
subCollectionViewGroupList.Add(
new DataGridVirtualizingCollectionViewGroup(subGroupName, subGroupItemCount, runningCount, this, nextLevel, nextLevelIsBottom));
runningCount += subGroupItemCount;
}
return(subCollectionViewGroupList);
}
internal QueryItemCountEventArgs(DataGridVirtualizingCollectionView collectionView,
DataGridVirtualizingCollectionViewGroup collectionViewGroup)
{
m_dataGridVirtualizingCollectionView = collectionView;
m_readonlyGroupPath = collectionViewGroup.GroupPath.AsReadOnly();
m_count = -1;
}
protected internal override void OnQueryItemsCompleted(VirtualPage page, AsyncQueryInfo queryInfo, object[] fetchedItems)
{
DataGridVirtualizingCollectionView collectionView = this.CollectionView as DataGridVirtualizingCollectionView;
// The VirtualPageManager was Disposed
if (collectionView == null)
{
return;
}
using (collectionView.DeferRefresh())
{
base.OnQueryItemsCompleted(page, queryInfo, fetchedItems);
}
}
protected internal override void OnAbortQueryItems(VirtualPage page, AsyncQueryInfo queryInfo)
{
DataGridVirtualizingCollectionView collectionView = this.CollectionView as DataGridVirtualizingCollectionView;
// The VirtualPageManager was Disposed
if (collectionView == null)
{
return;
}
DataGridVirtualizingCollectionViewGroup collectionViewGroup = this.GetLinkedCollectionViewGroup(page.ParentVirtualList) as DataGridVirtualizingCollectionViewGroup;
collectionView.OnAbortQueryItems(queryInfo, collectionViewGroup);
base.OnAbortQueryItems(page, queryInfo);
}
internal QueryItemsEventArgs(
DataGridVirtualizingCollectionView collectionView,
DataGridVirtualizingCollectionViewGroup collectionViewGroup,
AsyncQueryInfo asyncQueryInfo)
{
m_dataGridVirtualizingCollectionView = collectionView;
// The collectionViewGroup can be null when we abort
// a QueryItems for the old RootGroup when
// DataGridVirtualizingCollectionViewBase.ForceRefresh
// is called
m_readonlyGroupPath = (collectionViewGroup != null)
? collectionViewGroup.GroupPath.AsReadOnly()
: new ReadOnlyCollection <DataGridGroupInfo>(new List <DataGridGroupInfo>());
m_asyncQueryInfo = asyncQueryInfo;
}
protected override int OnQueryItemCountCore(VirtualList virtualList)
{
if (!this.IsConnected)
{
return(0);
}
DataGridVirtualizingCollectionView collectionView = this.CollectionView as DataGridVirtualizingCollectionView;
// The VirtualPageManager was Disposed
if (collectionView == null)
{
return(0);
}
DataGridVirtualizingCollectionViewGroup collectionViewGroup = this.GetLinkedCollectionViewGroup(virtualList) as DataGridVirtualizingCollectionViewGroup;
Debug.Assert((collectionViewGroup != null) && (collectionView != null));
return(collectionView.OnQueryItemCount(collectionViewGroup));
}
internal DataGridVirtualizingCollectionViewGroupRoot(DataGridVirtualizingCollectionView collectionView, bool isBottomLevel)
: base(null, -1, 0, null, -1, isBottomLevel)
{
m_parentCollectionView = collectionView;
m_virtualPageManager = new DataGridPageManager(collectionView);
}
public DataGridPageManager(DataGridVirtualizingCollectionView collectionView)
: base(collectionView)
{
}
internal override int QueryItemCount()
{
DataGridVirtualizingCollectionView collectionView = this.GetCollectionView() as DataGridVirtualizingCollectionView;
return(collectionView.OnQueryItemCount(this));
}