protected override DependencyObject GetContainerForItemOverride()
{
var treeViewItem = new ProperTreeViewItem(this.treeView);
treeViewItem.Indent = this.Indent + 12;
return(treeViewItem);
}
protected override DependencyObject GetContainerForItemOverride()
{
if (_pendingRoot != null)
{
_pendingRoot.Loaded -= OnRootLoaded;
_pendingRoot = null;
}
_pendingRoot = new ProperTreeViewItem(new WeakReference(this));
_pendingRoot.Loaded += OnRootLoaded;
_maxDepth = 0;
_rootItem.Target = null;
return(_pendingRoot);
}
public bool ApplyReduceDepthFilterIfNeeded(ProperTreeViewItem curNode)
{
if (this.pendingRoot != null)
{
this.OnRootLoaded();
}
if (this.maxDepth == 0)
{
return(false);
}
var rootItem = (TreeItem)this.rootItem.Target;
if (rootItem is null)
{
return(false);
}
if (this.snoopUI == null)
{
this.snoopUI = Window.GetWindow(this) as SnoopUI;
if (this.snoopUI is null)
{
return(false);
}
}
var item = (TreeItem)curNode.DataContext;
var selectedItem = this.snoopUI.CurrentSelection;
if (selectedItem != null && item.Depth < selectedItem.Depth)
{
item = selectedItem;
}
if (item.Depth - rootItem.Depth <= this.maxDepth)
{
return(false);
}
for (var i = 0; i < this.maxDepth; ++i)
{
item = item.Parent;
}
this.snoopUI.ApplyReduceDepthFilter(item);
return(true);
}
public bool ApplyReduceDepthFilterIfNeeded(ProperTreeViewItem curNode)
{
if (_pendingRoot != null)
{
OnRootLoaded();
}
if (_maxDepth == 0)
{
return(false);
}
var rootItem = (VisualTreeItem)_rootItem.Target;
if (rootItem == null)
{
return(false);
}
if (_snoopUi == null)
{
_snoopUi = this.GetAncestor <SnoopUI>();
if (_snoopUi == null)
{
return(false);
}
}
var item = (VisualTreeItem)curNode.DataContext;
var selectedItem = _snoopUi.CurrentSelection;
if (selectedItem != null && item.Depth < selectedItem.Depth)
{
item = selectedItem;
}
if ((item.Depth - rootItem.Depth) <= _maxDepth)
{
return(false);
}
for (var i = 0; i < _maxDepth; ++i)
{
item = item.Parent;
}
_snoopUi.ApplyReduceDepthFilter(item);
return(true);
}
private void OnRootLoaded()
{
// The following assumptions are made:
// 1. The visual structure of each TreeViewItem is the same regardless of its location.
// 2. The control template of a TreeViewItem contains ItemsPresenter.
ProperTreeViewItem root = _pendingRoot;
_pendingRoot = null;
root.Loaded -= OnRootLoaded;
ItemsPresenter itemsPresenter = null;
root.EnumerateTree(null, delegate(Visual visual, object misc)
{
itemsPresenter = visual as ItemsPresenter;
if (itemsPresenter != null && ReferenceEquals(itemsPresenter.TemplatedParent, root))
{
return(HitTestResultBehavior.Stop);
}
itemsPresenter = null;
return(HitTestResultBehavior.Continue);
}, null);
if (itemsPresenter != null)
{
int levelLayoutDepth = 2;
DependencyObject tmp = itemsPresenter;
while (!ReferenceEquals(tmp, root))
{
++levelLayoutDepth;
tmp = VisualTreeHelper.GetParent(tmp);
}
int rootLayoutDepth = 0;
while (tmp != null)
{
++rootLayoutDepth;
tmp = VisualTreeHelper.GetParent(tmp);
}
_maxDepth = (240 - rootLayoutDepth) / levelLayoutDepth;
_rootItem = new WeakReference((VisualTreeItem)root.DataContext);
}
}
// We need this method and what it does because:
// If we have a tree with levels greater than 150 then we might get an StackOverflowException during measure/arrange.
// To prevent these Exceptions (which immediately crash the program being snooped) we use the item at the current level (minus a few) as the new root node for the tree.
// That way we get a "new" tree that is not as deeply nested as before.
public bool ApplyReduceDepthFilterIfNeeded(ProperTreeViewItem curNode)
{
if (this.maxDepth == 0)
{
return(false);
}
if (this.snoopUI is null)
{
this.snoopUI = Window.GetWindow(this) as SnoopUI;
if (this.snoopUI is null)
{
return(false);
}
}
var item = (TreeItem)curNode.DataContext;
var selectedItem = this.snoopUI.CurrentSelection;
if (selectedItem is not null &&
item.Depth < selectedItem.Depth)
{
item = selectedItem;
}
var rootItem = this.GetRootItem();
if (rootItem is null)
{
return(false);
}
// Do we exceed the current max depth?
if (item.Depth - rootItem.Depth <= this.maxDepth)
{
return(false);
}
if (item.Parent is null)
{
return(false);
}
// Try to show 10 items above new root, that way we can keep a bit of context
var newRoot = item.Parent;
for (var i = 0; i < 10; ++i)
{
if (newRoot?.Parent is null)
{
break;
}
newRoot = newRoot.Parent;
}
this.snoopUI.ApplyReduceDepthFilter(newRoot !);
return(true);
}