private void HandleItemReset( GeneratorNode node )
{
//these 4 variables will hold the content for the Removal and the re-addition of the items.
int countGeneratedRemoved;
GeneratorPosition itemGenPos;
List<DependencyObject> removedContainers = new List<DependencyObject>();
//by definition, items from a node are contiguous...
itemGenPos = this.FindFirstRealizedItemsForNode( node );
int removeIndex = ( itemGenPos.Offset == 0 ) ? m_genPosToIndex[ itemGenPos.Index ] : -1;
countGeneratedRemoved = this.RemoveGeneratedItems( node, removedContainers );
// ensure that the mapping of the details to that node are removed!
ItemsGeneratorNode itemsNode = node as ItemsGeneratorNode;
if( ( itemsNode != null ) && ( itemsNode.Details != null ) )
{
int detailCount = 0;
foreach( List<DetailGeneratorNode> detailList in itemsNode.Details.Values )
{
foreach( DetailGeneratorNode detailNode in detailList )
{
detailCount += detailNode.ItemCount;
}
}
#if LOG
Log.WriteLine( this, "details.Clear - IN" + itemsNode.GetHashCode().ToString() );
#endif
itemsNode.Details.Clear();
itemsNode.Details = null;
node.AdjustItemCount( -detailCount );
}
//send the removal notification to the panel...
this.IncrementCurrentGenerationCount();
if( countGeneratedRemoved > 0 )
{
this.SendRemoveEvent( itemGenPos, removeIndex, 0, countGeneratedRemoved, removedContainers );
}
}
private void HandleItemAddition( GeneratorNode node, NotifyCollectionChangedEventArgs e )
{
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( node, 0, 0 ); //index not important for now.
node.AdjustItemCount( e.NewItems.Count );
ItemsGeneratorNode itemsNode = node as ItemsGeneratorNode;
if( itemsNode != null )
{
itemsNode.AdjustLeafCount( e.NewItems.Count );
this.OffsetDetails( itemsNode, e.NewStartingIndex, e.NewItems.Count );
}
//if the node is totally expanded
if( node.IsComputedExpanded )
{
nodeHelper.ReverseCalculateIndex();
//invalidate the indexes
this.IncrementCurrentGenerationCount();
int startIndex = nodeHelper.Index + e.NewStartingIndex;
GeneratorPosition addGenPos = this.GeneratorPositionFromIndex( startIndex );
//and send notification message
this.SendAddEvent( addGenPos, startIndex, e.NewItems.Count );
}
}
