xenadmin/XenAdmin/Commands/CollapseChildTreeNodesCommand.cs

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using System;
using System.Collections.Generic;
using System.Text;
using XenAdmin.Controls;
using System.Collections.ObjectModel;


namespace XenAdmin.Commands
{
    /// <summary>
    /// Collapses the specified tree nodes.
    /// </summary>
    internal class CollapseChildTreeNodesCommand : Command
    {
        private readonly IList<VirtualTreeNode> _nodes;

        public CollapseChildTreeNodesCommand(IMainWindow mainWindow, IList<VirtualTreeNode> nodes)
            : base(mainWindow)
        {
            Util.ThrowIfParameterNull(nodes, "nodes");
            _nodes = nodes;
        }

        protected override void ExecuteCore(SelectedItemCollection selection)
        {
            foreach (VirtualTreeNode node in _nodes)
            {
                foreach (VirtualTreeNode child in node.Nodes)
                {
                    child.Collapse();
                }
            }
        }

        protected override bool CanExecuteCore(SelectedItemCollection selection)
        {
            foreach (VirtualTreeNode node in _nodes)
            {
                if (node.IsExpanded && ChildrenHaveExpandedChildren(node))
                {
                    return true;
                }
            }
            return false;
        }

        private bool ChildrenHaveExpandedChildren(VirtualTreeNode node)
        {
            foreach (VirtualTreeNode child in node.Nodes)
            {
                if (child.Nodes.Count > 0 && child.IsExpanded)
                {
                    return true;
                }
            }

            return false;
        }

        public override string MenuText
        {
            get
            {
                return Messages.COLLAPSE_CHILDREN;
            }
        }
    }
}