internal void OnQueryAutoFilterDistinctValues(QueryAutoFilterDistinctValuesEventArgs e)
{
if (this.QueryAutoFilterDistinctValues != null)
{
this.QueryAutoFilterDistinctValues(this, e);
}
DataGridVirtualizingCollectionViewSource source = this.ParentCollectionViewSourceBase as DataGridVirtualizingCollectionViewSource;
if (source != null)
{
source.OnQueryAutoFilterDistinctValues(e);
}
}
internal override DataGridCollectionViewBase EnsureDataGridCollectionViewBaseCore()
{
DataGridVirtualizingCollectionViewSource parentSource = this.ParentSource as DataGridVirtualizingCollectionViewSource;
if (!parentSource.IsInitialized)
{
return(null);
}
return(new DataGridVirtualizingCollectionView(
parentSource.ItemType,
parentSource.AutoCreateItemProperties,
parentSource.PageSize,
parentSource.MaxRealizedItemCount));
}
internal void OnQueryItems(AsyncQueryInfo asyncQueryInfo, DataGridVirtualizingCollectionViewGroup collectionViewGroup)
{
QueryItemsEventArgs e = new QueryItemsEventArgs(this, collectionViewGroup, asyncQueryInfo);
if (this.QueryItems != null)
{
this.QueryItems(this, e);
}
DataGridVirtualizingCollectionViewSource source = this.ParentCollectionViewSourceBase as DataGridVirtualizingCollectionViewSource;
if (source != null)
{
source.OnQueryItems(e);
}
}
internal int OnQueryItemCount(DataGridVirtualizingCollectionViewGroup collectionViewGroup)
{
QueryItemCountEventArgs e = new QueryItemCountEventArgs(this, collectionViewGroup);
if (this.QueryItemCount != null)
{
this.QueryItemCount(this, e);
}
DataGridVirtualizingCollectionViewSource source = this.ParentCollectionViewSourceBase as DataGridVirtualizingCollectionViewSource;
if (source != null)
{
source.OnQueryItemCount(e);
}
return(e.Count);
}
internal List <GroupNameCountPair> OnQueryGroups(DataGridVirtualizingCollectionViewGroup parentGroup)
{
ObservableCollection <GroupDescription> groupDescriptions = this.GroupDescriptions;
int nextLevel = parentGroup.Level + 1;
Debug.Assert((groupDescriptions != null) && (groupDescriptions.Count > nextLevel));
QueryGroupsEventArgs e = new QueryGroupsEventArgs(this, parentGroup, groupDescriptions[nextLevel]);
if (this.QueryGroups != null)
{
this.QueryGroups(this, e);
}
DataGridVirtualizingCollectionViewSource source = this.ParentCollectionViewSourceBase as DataGridVirtualizingCollectionViewSource;
if (source != null)
{
source.OnQueryGroups(e);
}
return(e.ChildGroupNameCountPairs);
}
public DataGridVirtualizingCollectionViewDataProvider(DataGridVirtualizingCollectionViewSource parentSource)
: base(parentSource)
{
}
