xenadmin/XenAdmin/Controls/TreeViews/VirtualTreeNodeCollection.cs

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using System.Collections.ObjectModel;
using System.Windows.Forms;
using System.Diagnostics;
using System;
using System.Collections.Generic;

namespace XenAdmin.Controls
{
    public partial class VirtualTreeView
    {
        public class VirtualTreeNodeCollection : Collection<VirtualTreeNode>
        {
            private readonly IVirtualTreeNodeCollectionOwner _owner;

            internal VirtualTreeNodeCollection(IVirtualTreeNodeCollectionOwner owner)
            {
                Util.ThrowIfParameterNull(owner, "owner");
                _owner = owner;
            }

            internal IVirtualTreeNodeCollectionOwner Owner
            {
                get { return _owner; }
            }

            protected override void InsertItem(int index, VirtualTreeNode item)
            {
                base.InsertItem(index, item);
                item.Owner = _owner;

                if (item.AllParentsAreExpanded)
                {
                    _owner.RealNodes.Insert(index, item);
                }
                else
                {
                    // this node is not visible. just add a dummy node so the "+" icon is visible.

                    if (_owner.RealNodes.Count == 0)
                    {
                        _owner.RealNodes.Add(new DummyTreeNode());
                    }
                }
            }

            protected override void ClearItems()
            {
                base.ClearItems();
                _owner.RealNodes.Clear();
            }

            protected override void RemoveItem(int index)
            {
                VirtualTreeNode node = this[index];

                base.RemoveItem(index);

                if (Count == 0)
                {
                    _owner.RealNodes.Clear();
                }
                else if (_owner.RealNodes.Contains(node))
                {
                    _owner.RealNodes.Remove(node);
                }
            }

            protected override void SetItem(int index, VirtualTreeNode item)
            {
                // the treeview is peculiar in that it uses the set indexer to *insert* an item... not to set an item -- we'll do the same.
                InsertItem(index, item);
            }

            public VirtualTreeNode[] Find(Predicate<VirtualTreeNode> match, bool searchAllDescendants)
            {
                var output = new List<VirtualTreeNode>();
                Find(this, match, output, searchAllDescendants);
                return output.ToArray();
            }

            private void Find(IEnumerable<VirtualTreeNode> nodes, Predicate<VirtualTreeNode> match, List<VirtualTreeNode> output, bool searchAllDescendants)
            {
                foreach (VirtualTreeNode node in nodes)
                {
                    if (match(node))
                    {
                        output.Add(node);
                    }
                    if (searchAllDescendants)
                    {
                        Find(node.Nodes, match, output, searchAllDescendants);
                    }
                }
            }
        }
    }
}