Source/AdvTree/SelectedNodesCollection.cs

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using System;
using System.Text;

namespace DevComponents.AdvTree
{
    /// <summary>
    /// Represents the selected nodes collection.
    /// </summary>
    public class SelectedNodesCollection : NodeCollection
    {
        #region Internal Implementation
        internal AdvTree TreeSelectionControl = null;
        internal bool SuspendEvents = false;
        /// <summary>
        /// Initializes a new instance of the SelectedNodesCollection class.
        /// </summary>
        public SelectedNodesCollection()
        {
            PassiveCollection = true;
        }
        /// <summary>
        /// Adds new object to the collection and provides information about the source of the command
        /// </summary>
        /// <param name="node">Node to add</param>
        /// <param name="action">Source action</param>
        /// <returns></returns>
        public override int Add(Node node, eTreeAction action)
        {
            if (this.List.Contains(node)) return -1;

            if (TreeSelectionControl.MultiSelect)
            {
                if (TreeSelectionControl.MultiSelectRule == eMultiSelectRule.SameParent && this.Count>0)
                {
                    if (this[0].Parent != node.Parent)
                        throw new InvalidOperationException("Node being added does not belong to the same parent as currently selected nodes. See AdvTree.MultiSelectRule property");
                }
                if (!SuspendEvents)
                {
                    AdvTreeNodeCancelEventArgs cancelArgs = new AdvTreeNodeCancelEventArgs(action, node);
                    TreeSelectionControl.InvokeOnBeforeNodeSelect(cancelArgs);
                    if (cancelArgs.Cancel)
                        return -1;
                }
            }
            return base.Add(node, action);
        }

        protected override void OnInsertComplete(int index, object value)
        {
            if (TreeSelectionControl.MultiSelect)
            {
                Node node = value as Node;
                TreeSelectionControl.InvalidateNode(node);
                if (node.SelectedCell == null)
                    node.Cells[0].SetSelected(true);
                AdvTreeNodeEventArgs args = new AdvTreeNodeEventArgs(SourceAction, node);
                TreeSelectionControl.InvokeOnAfterNodeSelect(args);
            }
            base.OnInsertComplete(index, value);