void IDropTarget.DragLeave(UIElement draggedElement)
{
ColumnManagerCell cell = draggedElement as ColumnManagerCell;
if (cell == null)
{
return;
}
DataGridContext draggedDetailContext = DataGridControl.GetDataGridContext(draggedElement);
int lastIndex = draggedDetailContext.GroupLevelDescriptions.Count - 1;
if (lastIndex > -1)
{
GroupByItem groupByItem = this.ItemContainerGenerator.ContainerFromIndex(lastIndex) as GroupByItem;
Debug.Assert(groupByItem != null);
if (groupByItem == null)
{
throw new DataGridInternalException();
}
groupByItem.HideDropMark();
}
else
{
this.HideDropMark();
}
}
void IDropTarget.Drop(UIElement draggedElement)
{
ColumnManagerCell cell = draggedElement as ColumnManagerCell;
if (cell == null)
{
return;
}
DataGridContext draggedDetailContext = DataGridControl.GetDataGridContext(draggedElement);
int lastIndex = draggedDetailContext.GroupLevelDescriptions.Count - 1;
if (lastIndex > -1)
{
GroupByItem groupByItem = this.ItemContainerGenerator.ContainerFromIndex(lastIndex) as GroupByItem;
Debug.Assert(groupByItem != null);
if (groupByItem == null)
{
throw new DataGridInternalException("groupByItem is null.");
}
groupByItem.HideDropMark();
}
else
{
this.HideDropMark();
}
DataGridContext dataGridContext = DataGridControl.GetDataGridContext(this);
DataGridControl parentGrid = (dataGridContext != null)
? dataGridContext.DataGridControl
: null;
GroupingHelper.AppendNewGroupFromColumnManagerCell(cell, parentGrid);
}
