Revit.Plugln/FWindSoft/FWindSoft.Revit/IdlingEvent/SelectedChangedCommand.cs

/*-------------------------------------------------------------------------
 * 功能描述：SelectedChangedCommand
 * 作者：xulisong
 * 创建时间： 2019/5/31 16:03:04
 * 版本号：v1.0
 *  -------------------------------------------------------------------------*/

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Autodesk.Revit.UI.Events;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;

namespace FWindSoft.Revit
{
    public class SelectedChangedCommand: SingleIdingCommand
    {
        private HashSet<ElementId> m_OldIds;
        protected override void ApplicaionIdling(object sender, IdlingEventArgs e)
        {
            if (!Enable)
            {
                return;
            }
            var application = sender as UIApplication;
            var ids = application.ActiveUIDocument.Selection.GetElementIds();
            //if (ids.Count == 0)
            //{
            //    return;
            //}
            if (m_OldIds == null || ids.Count != m_OldIds.Count || ids.Any(id => !m_OldIds.Contains(id)))
            {
                base.ApplicaionIdling(sender, e);
                m_OldIds = new HashSet<ElementId>(ids);
            }
        }
    }
}