private static TreeViewItem GetTreeViewItemFromGroupLevelDescription(TreeViewItem rootItem, GroupLevelDescription groupLevelDescription)
{
TreeViewItem returned = null;
Debug.Assert(rootItem != null);
Debug.Assert(groupLevelDescription != null);
if (rootItem == null)
{
throw new DataGridInternalException("rootItem is null.");
}
foreach (object item in rootItem.Items)
{
TreeViewItem child = rootItem.ItemContainerGenerator.ContainerFromItem(item) as TreeViewItem;
Debug.Assert(child != null);
if (child == null)
{
throw new DataGridInternalException("An item does not contain a valid item.");
}
DetailConfiguration detailConfiguration = child.Header as DetailConfiguration;
if (detailConfiguration == null)
{
throw new DataGridInternalException("An item's DataContext must be a DetailConfiguration except for the top-most HierarchicalGroupByControl, which contains a DataGridContext.");
}
if (detailConfiguration.GroupLevelDescriptions.Contains(groupLevelDescription))
{
returned = child;
break;
}
returned = HierarchicalGroupByControl.GetTreeViewItemFromGroupLevelDescription(child, groupLevelDescription);
if (returned != null)
{
break;
}
}
return(returned);
}
internal HierarchicalGroupByControlNode GetHierarchicalGroupByControlNodeFromHierarchicalGroupByItem(HierarchicalGroupByItem hierarchicalGroupByItem)
{
Debug.Assert(hierarchicalGroupByItem != null);
if (hierarchicalGroupByItem == null)
{
return(null);
}
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;
if (rootItem == null)
{
throw new DataGridInternalException("The root item is null.");
}
GroupLevelDescription detailGroupLevelDescription = hierarchicalGroupByItem.Content as GroupLevelDescription;
Debug.Assert(detailGroupLevelDescription != null);
TreeViewItem dropMarkedTreeViewItem = null;
DataGridContext rootDataGridContext = rootItem.Header as DataGridContext;
Debug.Assert(rootDataGridContext != null);
if (rootDataGridContext.GroupLevelDescriptions.Contains(detailGroupLevelDescription))
{
dropMarkedTreeViewItem = rootItem;
}
else
{
dropMarkedTreeViewItem = HierarchicalGroupByControl.GetTreeViewItemFromGroupLevelDescription(rootItem, detailGroupLevelDescription);
}
// 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;
Debug.Assert(treeViewItemHeader != null);
if (treeViewItemHeader == null)
{
throw new DataGridInternalException("An error occurred while retrieving the PART_Header template part of an item containing a HierarchicalGroupByControlNode.");
}
HierarchicalGroupByControlNode hierarchicalGroupByControlNode = HierarchicalGroupByControl.GetHierarchicalGroupByControlNode(treeViewItemHeader);
return(hierarchicalGroupByControlNode);
}