private void OnCustomGeneratorItemsChanged(object sender, CustomGeneratorChangedEventArgs e)
{
switch (e.Action)
{
//In case of a Reset, nothing to do since the Panel base class has cleared the internal children already!
case NotifyCollectionChangedAction.Reset:
if (this.InternalChildren.Count > 0)
{
this.RemoveInternalChildRange(0, this.InternalChildren.Count);
}
else
{
this.InvalidateMeasure();
}
break;
//If there was a removal (collapsing)
//or if there was a Move (edition of a Sorted field)
case NotifyCollectionChangedAction.Move:
case NotifyCollectionChangedAction.Remove:
//remove the concerned range
int index = e.OldPosition.Index;
if (e.OldPosition.Offset != 0)
{
index++;
}
this.RemoveInternalChildRange(index, e.ItemUICount);
break;
//if some items were added (expansion)
case NotifyCollectionChangedAction.Add:
//invalidate layout so that the items will be inserted in place!
this.InvalidateMeasure();
break;
case NotifyCollectionChangedAction.Replace:
Debug.Fail("NotifyCollectionChangedAction.Replace");
break;
default:
break;
}
}
private void HandleGeneratorItemsChanged(object sender, CustomGeneratorChangedEventArgs e)
{
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
{
this.OnItemsAdded(e.Position, e.Index, e.ItemCount);
break;
}
case NotifyCollectionChangedAction.Move:
{
this.OnItemsMoved(e.Position, e.Index, e.OldPosition, e.OldIndex, e.ItemCount, e.ItemUICount, e.RemovedContainers);
break;
}
case NotifyCollectionChangedAction.Remove:
{
this.OnItemsRemoved(e.Position, e.Index, e.OldPosition, e.OldIndex, e.ItemCount, e.ItemUICount, e.RemovedContainers);
break;
}
case NotifyCollectionChangedAction.Replace:
{
this.OnItemsReplaced(e.Position, e.Index, e.OldPosition, e.OldIndex, e.ItemCount, e.ItemUICount, e.RemovedContainers);
break;
}
case NotifyCollectionChangedAction.Reset:
{
this.OnItemsReset();
break;
}
default:
{
throw new System.ComponentModel.InvalidEnumArgumentException("An unknown action was specified.");
}
}
}
private void HandleGeneratorItemsChanged(object sender, CustomGeneratorChangedEventArgs e)
{
// We set this flag to delay any bring into view until a layout pass occured if there is one.
// We don't want the bring into view to occur on a container that may move around during the layout pass.
this.DelayBringIntoView = true;
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
this.OnItemsAdded();
break;
case NotifyCollectionChangedAction.Remove:
this.OnItemsRemoved(e.Containers);
break;
default:
this.OnItemsReset();
break;
}
this.Dispatcher.BeginInvoke(new Action(() => this.DelayBringIntoView = false), DispatcherPriority.Loaded);
}
private void HandleDetailMoveRemove( object masterItem, DetailGeneratorNode detailNode, CustomGeneratorChangedEventArgs e )
{
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( m_startNode, 0, 0 );
int masterIndex = nodeHelper.FindItem( masterItem );
//If the masterItem is part of an ItemsGeneratorNode which is below a collapsed group, masterIndex will be -1
if( masterIndex == -1 )
{
//in that case, I need to determine the appropriate masterNode another way
nodeHelper = new GeneratorNodeHelper( m_startNode, 0, 0 );
if( !nodeHelper.Contains( masterItem ) )
throw new DataGridInternalException();
}
ItemsGeneratorNode masterNode = nodeHelper.CurrentNode as ItemsGeneratorNode;
Debug.Assert( masterNode != null, "masterNode != null" );
#if LOG
Log.Assert( this, masterNode != null, "masterNode != null" );
#endif
int globalIndex = -1;
GeneratorPosition convertedGeneratorPosition = ( masterIndex != -1 ) ? this.ConvertDetailGeneratorPosition( e.OldPosition, masterItem, detailNode, out globalIndex ) : new GeneratorPosition( -1, 1 );
if( masterIndex != -1 )
{
this.RemoveDetailContainers( convertedGeneratorPosition, e.ItemUICount );
}
if( e.Action == NotifyCollectionChangedAction.Remove )
{
masterNode.AdjustItemCount( -e.ItemCount );
detailNode.UpdateItemCount();
}
this.IncrementCurrentGenerationCount();
if( masterIndex != -1 )
{
this.SendRemoveEvent( convertedGeneratorPosition, globalIndex, e.ItemCount, e.ItemUICount, e.RemovedContainers );
}
}
private void HandleDetailGeneratorContentChanged( object sender, CustomGeneratorChangedEventArgs e )
{
Debug.Assert( m_isProcessingGlobalResetOrRemovingAllGeneratedItemsDisposableCount == 0, "Generator is already processing a HandleGlobalItemReset or CleanupGenerator" );
#if LOG
Log.Assert( this, m_isProcessingGlobalResetOrRemovingAllGeneratedItemsDisposableCount == 0, "Generator is already processing a HandleGlobalItemReset or CleanupGenerator" );
#endif
if( m_isProcessingGlobalResetOrRemovingAllGeneratedItemsDisposableCount > 0 )
return;
using( new ProcessingGlobalItemsResetOrRemovingAllGeneratedItemsDisposable( this ) )
{
Debug.Assert( m_startNode != null, "m_startNode != null" );
#if LOG
Log.Assert( this, m_startNode != null, "m_startNode != null" );
#endif
CustomItemContainerGenerator detailGenerator = sender as CustomItemContainerGenerator;
Debug.Assert( detailGenerator != null, "detailGenerator != null" );
#if LOG
Log.Assert( this, detailGenerator != null, "detailGenerator != null" );
#endif
object masterItem;
DetailGeneratorNode detailNode = this.FindDetailGeneratorNodeForGenerator( detailGenerator, out masterItem );
Debug.Assert( masterItem != null, "masterItem != null" );
Debug.Assert( detailNode != null, "detailNode != null" );
#if LOG
Log.Assert( this, masterItem != null, "masterItem != null" );
Log.Assert( this, detailNode != null, "detailNode != null" );
#endif
if( ( detailNode != null ) && ( masterItem != null ) )
{
switch( e.Action )
{
case NotifyCollectionChangedAction.Add:
this.HandleDetailAddition( masterItem, detailNode, e );
break;
case NotifyCollectionChangedAction.Move:
case NotifyCollectionChangedAction.Remove:
this.HandleDetailMoveRemove( masterItem, detailNode, e );
break;
case NotifyCollectionChangedAction.Replace: //CustomItemContainerGenreator never issues a Replace!
throw new DataGridInternalException();
case NotifyCollectionChangedAction.Reset:
this.HandleDetailReset( masterItem, detailNode );
break;
default:
break;
}
}
}
}
private void OnCustomGeneratorItemsChanged( object sender, CustomGeneratorChangedEventArgs e )
{
switch( e.Action )
{
//In case of a Reset, nothing to do since the Panel base class has cleared the internal children already!
case NotifyCollectionChangedAction.Reset:
if ( this.InternalChildren.Count > 0 )
{
this.RemoveInternalChildRange( 0, this.InternalChildren.Count );
}
else
{
this.InvalidateMeasure();
}
break;
//If there was a removal (collapsing)
//or if there was a Move (edition of a Sorted field)
case NotifyCollectionChangedAction.Move:
case NotifyCollectionChangedAction.Remove:
//remove the concerned range
int index = e.OldPosition.Index;
if(e.OldPosition.Offset != 0)
{
index++;
}
this.RemoveInternalChildRange( index, e.ItemUICount );
break;
//if some items were added (expansion)
case NotifyCollectionChangedAction.Add:
//invalidate layout so that the items will be inserted in place!
this.InvalidateMeasure();
break;
case NotifyCollectionChangedAction.Replace:
Debug.Fail("NotifyCollectionChangedAction.Replace");
break;
default:
break;
}
}
private void HandleGeneratorItemsChanged( object sender, CustomGeneratorChangedEventArgs e )
{
switch( e.Action )
{
case NotifyCollectionChangedAction.Add:
{
this.OnItemsAdded( e.Position, e.Index, e.ItemCount );
break;
}
case NotifyCollectionChangedAction.Move:
{
this.OnItemsMoved( e.Position, e.Index, e.OldPosition, e.OldIndex, e.ItemCount, e.ItemUICount, e.RemovedContainers );
break;
}
case NotifyCollectionChangedAction.Remove:
{
this.OnItemsRemoved( e.Position, e.Index, e.OldPosition, e.OldIndex, e.ItemCount, e.ItemUICount, e.RemovedContainers );
break;
}
case NotifyCollectionChangedAction.Replace:
{
this.OnItemsReplaced( e.Position, e.Index, e.OldPosition, e.OldIndex, e.ItemCount, e.ItemUICount, e.RemovedContainers );
break;
}
case NotifyCollectionChangedAction.Reset:
{
this.OnItemsReset();
break;
}
default:
{
throw new System.ComponentModel.InvalidEnumArgumentException( "An unknown action was specified." );
}
}
}
private void OnCustomGeneratorItemsChanged(object sender, CustomGeneratorChangedEventArgs e)
{
switch (e.Action)
{
//In case of a Reset, nothing to do since the Panel base class has cleared the internal children already!
case NotifyCollectionChangedAction.Reset:
{
if (this.InternalChildren.Count > 0)
{
this.RemoveInternalChildRange(0, this.InternalChildren.Count);
}
else
{
this.InvalidateMeasure();
}
}
break;
//If there was a removal (collapsing)
//or if there was a Move (edition of a Sorted field)
case NotifyCollectionChangedAction.Move:
case NotifyCollectionChangedAction.Remove:
{
var containers = new HashSet <DependencyObject>(e.Containers ?? new DependencyObject[0]);
if (containers.Count > 0)
{
var children = this.InternalChildren;
var from = -1;
var removeCount = 0;
var i = 0;
while (i < children.Count)
{
var container = children[i];
if (containers.Contains(container))
{
containers.Remove(container);
if (from < 0)
{
from = i;
}
removeCount++;
i++;
}
else if (removeCount > 0)
{
Debug.Assert(from >= 0);
this.RemoveInternalChildRange(from, removeCount);
from = -1;
removeCount = 0;
}
else
{
i++;
}
}
if (removeCount > 0)
{
Debug.Assert(from >= 0);
this.RemoveInternalChildRange(from, removeCount);
}
}
else
{
this.InvalidateMeasure();
}
}
break;
//if some items were added (expansion)
case NotifyCollectionChangedAction.Add:
{
//invalidate layout so that the items will be inserted in place!
this.InvalidateMeasure();
}
break;
case NotifyCollectionChangedAction.Replace:
{
Debug.Fail("NotifyCollectionChangedAction.Replace");
}
break;
default:
break;
}
}
