public void ScrollToEntity(int index)
{
VirtualizingPanel panel = EditorControlUtility.FindVisualChild <VirtualizingPanel>(EntityTree, "");
if (panel != null)
{
panel.BringIndexIntoViewPublic(index);
}
}
/// <summary>
/// Navigates to.
/// http://stackoverflow.com/questions/183636/selecting-a-node-in-virtualized-treeview-with-wpf
/// </summary>
/// <param name="path">The path.</param>
/// <returns><see cref="bool"/></returns>
public bool NavigateTo(string path)
{
if (string.IsNullOrEmpty(path))
{
return(false);
}
FolderService ds = Factory.Resolve <FolderService>();
FileData root =
ds.Tree.FirstOrDefault(
x => path.StartsWith(x.FullPath + Path.DirectorySeparatorChar, StringComparison.OrdinalIgnoreCase));
if (root == null)
{
return(false);
}
string[] pathParts = FolderNavigationService.GetPathParts(path.Substring(root.FullPath.Length));
List <FileData> tree = new List <FileData> {
root
};
FileData current = root;
for (int i = 0; i < pathParts.Length; i++)
{
FileData next = current.Children.FirstOrDefault(
x => x.IsDirectory == (i != pathParts.Length - 1) &&
string.Equals(x.Name, pathParts[i], StringComparison.OrdinalIgnoreCase));
tree.Add(next);
current = next;
if (next == null)
{
return(false);
}
}
ItemsControl currentParent = this.TreeView;
foreach (FileData node in tree)
{
// first try the easy way
TreeViewItem newParent = currentParent.ItemContainerGenerator.ContainerFromItem(node) as TreeViewItem;
if (newParent == null)
{
// if this failed, it's probably because of virtualization, and we will have to do it the hard way.
// this code is influenced by TreeViewItem.ExpandRecursive decompiled code, and the MSDN sample at http://code.msdn.microsoft.com/Changing-selection-in-a-6a6242c8/sourcecode?fileId=18862&pathId=753647475
// see also the question at http://stackoverflow.com/q/183636/46635
currentParent.ApplyTemplate();
ItemsPresenter itemsPresenter =
(ItemsPresenter)currentParent.Template.FindName("ItemsHost", currentParent);
if (itemsPresenter != null)
{
itemsPresenter.ApplyTemplate();
}
else
{
currentParent.UpdateLayout();
}
VirtualizingPanel virtualizingPanel =
FolderNavigationService.GetItemsHost(currentParent) as VirtualizingPanel;
if (virtualizingPanel == null)
{
return(false);
}
FolderNavigationService.CallEnsureGenerator(virtualizingPanel);
int index = currentParent.Items.IndexOf(node);
if (index < 0)
{
throw new InvalidOperationException("Node '" + node + "' cannot be found in container");
}
virtualizingPanel.BringIndexIntoViewPublic(index);
newParent = currentParent.ItemContainerGenerator.ContainerFromIndex(index) as TreeViewItem;
}
if (newParent == null)
{
throw new InvalidOperationException(
"Tree view item cannot be found or created for node '" + node + "'");
}
if (node == tree.Last())
{
newParent.IsSelected = true;
newParent.BringIntoView();
break;
}
newParent.IsExpanded = true;
currentParent = newParent;
}
return(true);
}
private static void OnSelectedItemChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var newNode = e.NewValue as INode;
if (newNode == null)
{
return;
}
var behavior = (NodeTreeSelectionBehavior)d;
var tree = behavior.AssociatedObject;
var nodeDynasty = new List <INode> {
newNode
};
var parent = newNode.Parent;
while (parent != null)
{
nodeDynasty.Insert(0, parent);
parent = parent.Parent;
}
var currentParent = tree as ItemsControl;
foreach (var node in nodeDynasty)
{
// first try the easy way
var newParent = currentParent.ItemContainerGenerator.ContainerFromItem(node) as TreeViewItem;
var index = 0;
VirtualizingPanel virtualizingPanel = null;
if (newParent == null)
{
// if this failed, it's probably because of virtualization, and we will have to do it the hard way.
// this code is influenced by TreeViewItem.ExpandRecursive decompiled code, and the MSDN sample at http://code.msdn.microsoft.com/Changing-selection-in-a-6a6242c8/sourcecode?fileId=18862&pathId=753647475
// see also the question at http://stackoverflow.com/q/183636/46635
currentParent.ApplyTemplate();
var itemsPresenter = (ItemsPresenter)currentParent.Template.FindName("ItemsHost", currentParent);
if (itemsPresenter != null)
{
itemsPresenter.ApplyTemplate();
}
else
{
currentParent.UpdateLayout();
}
virtualizingPanel = GetItemsHost(currentParent) as VirtualizingPanel;
CallEnsureGenerator(virtualizingPanel);
index = currentParent.Items.IndexOf(node);
if (index < 0)
{
throw new InvalidOperationException("Node '" + node + "' cannot be fount in container");
}
if (virtualizingPanel != null)
{
virtualizingPanel.BringIndexIntoViewPublic(index);
}
newParent = currentParent.ItemContainerGenerator.ContainerFromIndex(index) as TreeViewItem;
if (newParent == null)
{
currentParent.UpdateLayout();
virtualizingPanel.BringIndexIntoViewPublic(index);
newParent = currentParent.ItemContainerGenerator.ContainerFromIndex(index) as TreeViewItem;
}
}
if (newParent == null)
{
throw new InvalidOperationException("Tree view item cannot be found or created for node '" + node + "'");
}
if (node == newNode)
{
newParent.IsSelected = true;
newParent.BringIntoView();
break;
}
newParent.IsExpanded = true;
currentParent = newParent;
}
}
