using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Linq;
using System.Text;
using DevExpress.XtraNavBar;

namespace WMS.Ctrl
{
    public partial class MyNavBarGroup : NavBarGroup
    {
        public MyNavBarGroup()
            : base()
        {
        }

        public MyNavBarGroup(string caption)
            : base(caption)
        {
        }

        //重写展开折叠属性,在set中触发自己定义的事件  
        private bool _Expanded = false;
        /// <summary>  
        /// 展开折叠属性  
        /// </summary>  
        public override bool Expanded
        {
            get
            {
                return _Expanded;
            }
            set
            {
                //触发改变之前的事件  
                CancelEventArgs args = new CancelEventArgs() { Cancel = false };
                OnExpandChanging(args);

                //是否可以展开,是否取消,是否与上次一值想等  
                if (CanExpand && !args.Cancel && _Expanded != value)
                {
                    base.Expanded = _Expanded = value;
                    //触发修改之后的事件  
                    OnExpandChanged(new ExpandedEventArgs(value));
                }
            }
        }

        //自己加了一个属性,是否能够折叠或者展开,有的时候我们需要这个功能  
        private bool _CanExpand = true;
        /// <summary>  
        /// 是否能够展开折叠(为false时,则不能展开或者折叠)  
        /// </summary>  
        public virtual bool CanExpand
        {
            get { return _CanExpand; }
            set { _CanExpand = value; }
        }

        /// <summary>  
        /// 展开或者折叠之后  
        /// </summary>  
        public event EventHandler<ExpandedEventArgs> ExpandChanged;
        protected virtual void OnExpandChanged(ExpandedEventArgs e)
        {
            if (ExpandChanged != null)
            {
                ExpandChanged(this, e);
            }
        }

        /// <summary>  
        /// 展开或者折叠之前  
        /// </summary>  
        public event EventHandler<CancelEventArgs> ExpandChanging;
        protected virtual void OnExpandChanging(CancelEventArgs e)
        {
            if (ExpandChanging != null)
            {
                ExpandChanging(this, e);
            }
        }
    }

    public class ExpandedEventArgs : EventArgs
    {
        public ExpandedEventArgs()
        {
            Expanded = false;
        }

        public ExpandedEventArgs(bool expanded)
        {
            Expanded = expanded;
        }

        /// <summary>  
        /// 展开或者折叠  
        /// </summary>  
        public bool Expanded { get; set; }

    }
}