private static HierarchicalGroupByControlNode GetHierarchicalGroupByControlNode(UIElement element)
{
HierarchicalGroupByControlNode hierarchicalGroupByControlNode = element as HierarchicalGroupByControlNode;
if (hierarchicalGroupByControlNode != null)
{
return(hierarchicalGroupByControlNode);
}
int childCount = VisualTreeHelper.GetChildrenCount(element);
for (int i = 0; i < childCount; i++)
{
UIElement child = VisualTreeHelper.GetChild(element, i) as UIElement;
if (child != null)
{
hierarchicalGroupByControlNode = HierarchicalGroupByControl.GetHierarchicalGroupByControlNode(child);
}
if (hierarchicalGroupByControlNode != null)
{
break;
}
}
return(hierarchicalGroupByControlNode);
}
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);
}
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);
}
