public void UpdateIndex()
{
if (Owner is TreeView treeViewOwner && Index == null)
{
Index = new TreeContainerIndex();
_treeView = treeViewOwner;
}
/// <summary>
/// Initializes a new instance of the <see cref="TreeItemContainerGenerator{T}"/> class.
/// </summary>
/// <param name="owner">The owner control.</param>
/// <param name="contentProperty">The container's Content property.</param>
/// <param name="contentTemplateProperty">The container's ContentTemplate property.</param>
/// <param name="itemsProperty">The container's Items property.</param>
/// <param name="isExpandedProperty">The container's IsExpanded property.</param>
/// <param name="index">The container index for the tree</param>
public TreeItemContainerGenerator(
IControl owner,
AvaloniaProperty contentProperty,
AvaloniaProperty contentTemplateProperty,
AvaloniaProperty itemsProperty,
AvaloniaProperty isExpandedProperty,
TreeContainerIndex index)
: base(owner, contentProperty, contentTemplateProperty)
{
Contract.Requires <ArgumentNullException>(owner != null);
Contract.Requires <ArgumentNullException>(contentProperty != null);
Contract.Requires <ArgumentNullException>(itemsProperty != null);
Contract.Requires <ArgumentNullException>(isExpandedProperty != null);
Contract.Requires <ArgumentNullException>(index != null);
ItemsProperty = itemsProperty;
IsExpandedProperty = isExpandedProperty;
Index = index;
}