private List <DataGridGroupInfo> BuildGroupPath()
{
DataGridVirtualizingCollectionViewGroup parent = this.Parent as DataGridVirtualizingCollectionViewGroup;
if (parent == null)
{
return(new List <DataGridGroupInfo>());
}
DataGridVirtualizingCollectionViewBase collectionView = this.GetCollectionView();
ObservableCollection <GroupDescription> groupDescriptions = collectionView.GroupDescriptions;
int level = this.Level;
Debug.Assert(this.Level != -1, "A DataGridCollectionViewGroupRoot should have returned a new List since its parent should have been null.");
List <DataGridGroupInfo> groupPath = new List <DataGridGroupInfo>(parent.GroupPath);
Debug.Assert(groupDescriptions.Count > level);
if (groupDescriptions.Count > level)
{
groupPath.Add(new DataGridGroupInfo(groupDescriptions[level], this));
}
return(groupPath);
}
private void OnVirtualItemListCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
DataGridVirtualizingCollectionViewBase collectionView = this.GetCollectionView();
lock (collectionView.DeferredOperationManager)
{
DeferredOperation deferredOperation = null;
switch (e.Action)
{
case NotifyCollectionChangedAction.Replace:
{
deferredOperation = new DeferredOperation(DeferredOperation.DeferredOperationAction.Replace, -1, e.NewStartingIndex + m_startGlobalIndex,
e.NewItems, e.OldStartingIndex + m_startGlobalIndex, e.OldItems);
break;
}
case NotifyCollectionChangedAction.Reset:
{
deferredOperation = new DeferredOperation(DeferredOperation.DeferredOperationAction.Refresh, -1, null);
break;
}
default:
throw new NotSupportedException(e.Action.ToString() + " is not a supported action.");
}
if (deferredOperation != null)
{
collectionView.ExecuteOrQueueSourceItemOperation(deferredOperation);
}
}
}
private IQueryable FilterQueryable(IQueryable queryable)
{
// Filters a queryable to match this Group's clause.
// This method does not apply the AutoFilter clauses or the FilterRow clauses.
// It is the DataGridVirtualizingQueryableCollectionViewGroupRoot's job to do so on the
// base queryable used as a base for all other queryables.
if (queryable == null)
{
throw new ArgumentNullException("queryable");
}
int level = this.Level;
DataGridVirtualizingCollectionViewBase collectionView = this.GetCollectionView();
ObservableCollection <GroupDescription> groupDescriptions = collectionView.GroupDescriptions;
Debug.Assert((groupDescriptions != null) && (level < groupDescriptions.Count));
DataGridGroupDescription groupBy = groupDescriptions[level] as DataGridGroupDescription;
Debug.Assert(groupBy != null);
ParameterExpression sharedParameterExpression = queryable.CreateParameterExpression();
Expression expression = queryable.CreateEqualExpression(sharedParameterExpression, groupBy.PropertyName, this.Name);
return(queryable.WhereFilter(sharedParameterExpression, expression));
}
internal override void ApplyExtraPropertiesToView(DataGridCollectionViewBase currentView)
{
base.ApplyExtraPropertiesToView(currentView);
DataGridVirtualizingCollectionViewBase dataGridVirtualizingCollectionView = currentView as DataGridVirtualizingCollectionViewBase;
dataGridVirtualizingCollectionView.PreemptivePageQueryRatio = this.PreemptivePageQueryRatio;
dataGridVirtualizingCollectionView.CommitMode = this.CommitMode;
}
public static void RemoveListener( DataGridVirtualizingCollectionViewBase source, IWeakEventListener listener )
{
if( source == null )
throw new ArgumentNullException( "source" );
if( listener == null )
throw new ArgumentNullException( "listener" );
CurrentManager.ProtectedRemoveListener( source, listener );
}
private void RaiseCollectionViewOnCommitItems(VirtualPage dispatchedPage, AsyncCommitInfo dispatchedCommitInfo)
{
DataGridVirtualizingCollectionViewBase collectionView = this.CollectionView as DataGridVirtualizingCollectionViewBase;
DataGridVirtualizingCollectionViewGroupBase collectionViewGroup =
this.GetLinkedCollectionViewGroup(dispatchedPage.ParentVirtualList) as DataGridVirtualizingCollectionViewGroupBase;
Debug.Assert((collectionViewGroup != null) && (collectionView != null));
collectionView.OnCommitItems(dispatchedCommitInfo);
}
private VirtualList CreateNewVirtualList()
{
Debug.Assert(m_isBottomLevel);
DataGridVirtualizingCollectionViewBase collectionView = this.GetCollectionView();
DataGridPageManagerBase virtualPageManagerBase = collectionView.RootGroup.GetVirtualPageManager();
VirtualList virtualItemList = new VirtualList(virtualPageManagerBase, m_virtualItemCount);
virtualPageManagerBase.LinkVirtualListAndCollectionViewGroup(virtualItemList, this);
return(virtualItemList);
}
public static void RemoveListener(DataGridVirtualizingCollectionViewBase source, IWeakEventListener listener)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (listener == null)
{
throw new ArgumentNullException("listener");
}
CurrentManager.ProtectedRemoveListener(source, listener);
}
private void EnsureProtectedVirtualItems()
{
if (m_protectedVirtualItems != null)
{
return;
}
DataGridVirtualizingCollectionViewBase collectionView = this.GetCollectionView();
Debug.Assert(collectionView != null);
if (m_isBottomLevel)
{
m_protectedVirtualItems = this.CreateNewVirtualList();
}
else
{
ObservableCollection <GroupDescription> groupDescriptions = collectionView.GroupDescriptions;
int groupDescriptionCount = (groupDescriptions == null) ? 0 : groupDescriptions.Count;
int nextLevel = m_level + 1;
if (nextLevel > (groupDescriptionCount - 1))
{
throw new DataGridInternalException("At attempt was made to retrieve child groups for a non-existing group description.");
}
GroupDescription subGroupBy = groupDescriptions[nextLevel];
if (subGroupBy == null)
{
throw new InvalidOperationException("TODDOOC: ");
}
bool nextLevelIsBottom = (nextLevel == (groupDescriptionCount - 1));
m_protectedVirtualItems = this.QuerySubCollectionViewGroupList(subGroupBy, nextLevel, nextLevelIsBottom);
}
}
private IQueryable SortQueryable(IQueryable queryable, bool reverseSort)
{
DataGridVirtualizingCollectionViewBase parentCollectionView = this.GetCollectionView();
Debug.Assert(parentCollectionView != null);
SortDescriptionCollection explicitSortDescriptions = parentCollectionView.SortDescriptions;
ListSortDirection directionToUseForImplicitSortDescriptions = ListSortDirection.Ascending;
if (explicitSortDescriptions.Count > 0)
{
directionToUseForImplicitSortDescriptions = explicitSortDescriptions[explicitSortDescriptions.Count - 1].Direction;
}
SortDescriptionCollection implicitSortDescriptions = new SortDescriptionCollection();
DataGridVirtualizingQueryableCollectionViewGroupRoot groupRoot =
parentCollectionView.RootGroup as DataGridVirtualizingQueryableCollectionViewGroupRoot;
Debug.Assert(groupRoot != null);
string[] primaryKeys = groupRoot.PrimaryKeys;
if (primaryKeys != null)
{
for (int i = 0; i < primaryKeys.Length; i++)
{
string primaryKey = primaryKeys[i];
Debug.Assert(!string.IsNullOrEmpty(primaryKey));
implicitSortDescriptions.Add(new SortDescription(primaryKey, directionToUseForImplicitSortDescriptions));
}
}
return(queryable.OrderBy(implicitSortDescriptions, explicitSortDescriptions, reverseSort));
}
internal CommitItemsEventArgs(DataGridVirtualizingCollectionViewBase collectionView, AsyncCommitInfo asyncCommitInfo)
{
m_dataGridVirtualizingCollectionViewBase = collectionView;
m_asyncCommitInfo = asyncCommitInfo;
}
internal override ObservableCollection <object> QuerySubCollectionViewGroupList(GroupDescription childGroupBy, int nextLevel, bool nextLevelIsBottom)
{
string childGroupByPropertyName = DataGridCollectionViewBase.GetPropertyNameFromGroupDescription(childGroupBy);
if (String.IsNullOrEmpty(childGroupByPropertyName))
{
throw new NotSupportedException("Custom groups are not supported when using a DataGridVirtualizingQueryableCollectionView.");
}
DataGridVirtualizingCollectionViewBase collectionView = this.GetCollectionView();
bool sortGroupBy = false;
ListSortDirection groupByDirection = ListSortDirection.Ascending;
foreach (SortDescription sortDescription in collectionView.SortDescriptions)
{
if (sortDescription.PropertyName == childGroupByPropertyName)
{
sortGroupBy = true;
groupByDirection = sortDescription.Direction;
break;
}
}
IQueryable groupsAndCountsQueryable = this.Queryable.GetSubGroupsAndCountsQueryable(childGroupByPropertyName, sortGroupBy, groupByDirection);
List <QueryableExtensions.IQueryableGroupNameCountPair> distinctValuesAndCounts = new List <QueryableExtensions.IQueryableGroupNameCountPair>();
try
{
System.Collections.IEnumerator enumerator = groupsAndCountsQueryable.GetEnumerator();
while (enumerator.MoveNext())
{
QueryableExtensions.IQueryableGroupNameCountPair current = enumerator.Current as QueryableExtensions.IQueryableGroupNameCountPair;
if (current != null)
{
distinctValuesAndCounts.Add(current);
}
}
}
catch
{
// TimeOut exception on the connection or other.
distinctValuesAndCounts.Clear();
}
// If we are not the bottom level, we should have subgroups.
// However, if the connection timed out and the catch statement set the coundAndDistinctValues to an empty array,
// then we shouldn't add anything. We cannot reset on the spot since we might already be resetting.
// Create the collection of sub CollectionViewGroups
ObservableCollection <object> subCollectionViewGroupList = new ObservableCollection <object>();
int runningCount = this.StartGlobalIndex;
int distinctValuesCount = distinctValuesAndCounts.Count;
for (int i = 0; i < distinctValuesCount; i++)
{
QueryableExtensions.IQueryableGroupNameCountPair queryableGroupNameCountPair = distinctValuesAndCounts[i];
subCollectionViewGroupList.Add(
new DataGridVirtualizingQueryableCollectionViewGroup(queryableGroupNameCountPair.GroupName, queryableGroupNameCountPair.Count, runningCount, this, nextLevel, nextLevelIsBottom));
runningCount += queryableGroupNameCountPair.Count;
}
return(subCollectionViewGroupList);
}
internal CommitItemsEventArgs( DataGridVirtualizingCollectionViewBase collectionView, AsyncCommitInfo asyncCommitInfo )
{
m_dataGridVirtualizingCollectionViewBase = collectionView;
m_asyncCommitInfo = asyncCommitInfo;
}
public DataGridPageManagerBase(DataGridVirtualizingCollectionViewBase collectionView)
: base(collectionView.Dispatcher, collectionView.PageSize, collectionView.MaxRealizedItemCount, collectionView.PreemptivePageQueryRatio)
{
m_collectionView = collectionView;
m_virtualListVSCollectionViewGroupDictionary = new Dictionary <VirtualList, DataGridVirtualizingCollectionViewGroupBase>();
}
