xenadmin/XenAdmin/Commands/Controls/PoolRemoveServerToolStripMenuItem.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Windows.Forms;
using XenAdmin.Core;


namespace XenAdmin.Commands
{
    internal class PoolRemoveServerToolStripMenuItem : CommandToolStripMenuItem
    {
        public PoolRemoveServerToolStripMenuItem()
            : base(new PoolRemoveServerCommand(), false)
        {
            base.DropDownItems.Add(new ToolStripMenuItem());
        }

        public PoolRemoveServerToolStripMenuItem(IMainWindow mainWindow, IEnumerable<SelectedItem> selection, bool inContextMenu)
            : base(new PoolRemoveServerCommand(mainWindow, selection), inContextMenu)
        {
            base.DropDownItems.Add(new ToolStripMenuItem());
        }

        [Browsable(false)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        public new Command Command => base.Command;

        protected override void OnDropDownOpening(EventArgs e)
        {
            DropDownItems.Clear();

            var selection = Command.GetSelection();
            var connection = selection.GetConnectionOfAllItems();
            var pool = Helpers.GetPool(connection);
            if (pool == null)
                return;

            var hosts = connection.Cache.Hosts;

            foreach (var host in hosts)
            {
                if (host.resident_VMs == null || host.resident_VMs.Count >= 2 || !host.IsLive())
                    continue;

                var cmd = new RemoveHostFromPoolCommand(Command.MainWindowCommandInterface, host);
                DropDownItems.Add(new CommandToolStripMenuItem(cmd, host.Name(), Images.GetImage16For(host)));
            }
        }

        private class PoolRemoveServerCommand : Command
        {
            public PoolRemoveServerCommand()
            {
            }

            public PoolRemoveServerCommand(IMainWindow mainWindow, IEnumerable<SelectedItem> selection)
                : base(mainWindow, selection)
            {
            }

            public override string MenuText => Messages.REMOVE_SERVER_MENU_ITEM;

            protected override bool CanExecuteCore(SelectedItemCollection selection)
            {
                var connection = selection.GetConnectionOfAllItems();
                var pool = Helpers.GetPool(connection);
                if (pool == null)
                    return false;

                return connection.Cache.Hosts.Any(host => host.resident_VMs != null && host.resident_VMs.Count < 2 && host.IsLive());
            }
        }
    }
}