xenadmin/XenAdmin/Commands/ExpandTreeNodesCommand.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>
    /// Expands the specified tree nodes.
    /// </summary>
    internal class ExpandTreeNodesCommand : Command
    {
        private readonly IList<VirtualTreeNode> _nodes;

        /// <summary>
        /// Initializes a new instance of this Command. The parameter-less constructor is required if 
        /// this Command is to be attached to a ToolStrip menu item or button. It should not be used in any other scenario.
        /// </summary>
        public ExpandTreeNodesCommand(IMainWindow mainWindow, IList<VirtualTreeNode> nodes)
            : base(mainWindow)
        {
            Util.ThrowIfParameterNull(nodes, "nodes");
            _nodes = nodes;
        }

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

        protected override bool CanExecuteCore(SelectedItemCollection selection)
        {
            return SomeCollapsedNodes(_nodes);
        }

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

        private static bool SomeCollapsedNodes(IEnumerable<VirtualTreeNode> nodes)
        {
            foreach (VirtualTreeNode node in nodes)
            {
                if (node.Nodes.Count > 0 && !node.IsExpanded)
                {
                    return true;
                }
                else if (SomeCollapsedNodes(node.Nodes))
                {
                    return true;
                }
            }

            return false;
        }
    }
}