private static TreeViewItem GetTreeViewItemFromGroupLevelDescriptionCollection(TreeViewItem rootItem, GroupLevelDescriptionCollection groupLevelDescriptions)
{
TreeViewItem returned = null;
Debug.Assert(rootItem != null);
Debug.Assert(groupLevelDescriptions != null);
if (rootItem == null)
{
throw new DataGridInternalException("rootItem is null.");
}
foreach (object item in rootItem.Items)
{
TreeViewItem child = rootItem.ItemContainerGenerator.ContainerFromItem(item) as TreeViewItem;
// It may not be visible
if (child == null)
{
continue;
}
DetailConfiguration detailConfiguration = child.Header as DetailConfiguration;
if (detailConfiguration == null)
{
throw new DataGridInternalException("The item's DataContext must be a DetailConfiguration except for the top-most HierarchicalGroupByControl, which contains a DataGridContext.");
}
if (groupLevelDescriptions == detailConfiguration.GroupLevelDescriptions)
{
returned = child;
break;
}
returned = HierarchicalGroupByControl.GetTreeViewItemFromGroupLevelDescriptionCollection(child, groupLevelDescriptions);
if (returned != null)
{
break;
}
}
return(returned);
}
internal HierarchicalGroupByControlNode GetHierarchicalGroupByControlNodeFromColumnManagerCell(ColumnManagerCell cell)
{
Debug.Assert(cell != null);
if (cell == null)
{
return(null);
}
DataGridContext cellDataGridContext = DataGridControl.GetDataGridContext(cell);
if (cellDataGridContext == null)
{
throw new DataGridInternalException("A DataGridContext cannot be null on ColumnManagerCell.");
}
TreeView treeView = this.GetTemplateChild(@"PART_HierarchicalGroupByControlTreeView") as TreeView;
if (treeView == null)
{
return(null);
}
if (treeView.Items.Count == 0)
{
throw new DataGridInternalException("The HierarchicalGroupByControl should contain at least one grouping level.");
}
// The first item is always the top level HierarchicalGroupByControlNode
TreeViewItem rootItem = treeView.ItemContainerGenerator.ContainerFromItem(treeView.Items[0]) as TreeViewItem;
// It may not be visible
if (rootItem == null)
{
return(null);
}
TreeViewItem dropMarkedTreeViewItem = null;
DataGridContext rootDataGridContext = rootItem.Header as DataGridContext;
if ((rootDataGridContext != null) && (rootDataGridContext.GroupLevelDescriptions == cellDataGridContext.GroupLevelDescriptions))
{
dropMarkedTreeViewItem = rootItem;
}
else
{
GroupLevelDescriptionCollection groupLevelDescriptions = cellDataGridContext.GroupLevelDescriptions;
dropMarkedTreeViewItem = HierarchicalGroupByControl.GetTreeViewItemFromGroupLevelDescriptionCollection(rootItem, groupLevelDescriptions);
}
// If null, it means the cell does not belong to this detail
if (dropMarkedTreeViewItem == null)
{
return(null);
}
ContentPresenter treeViewItemHeader = dropMarkedTreeViewItem.Template.FindName("PART_Header", dropMarkedTreeViewItem) as ContentPresenter;
// It may not be visible
if (treeViewItemHeader == null)
{
return(null);
}
HierarchicalGroupByControlNode hierarchicalGroupByControlNode = HierarchicalGroupByControl.GetHierarchicalGroupByControlNode(treeViewItemHeader);
return(hierarchicalGroupByControlNode);
}