using System.ComponentModel;
using System.Drawing;
using System.Drawing.Design;
using System.Windows.Forms;

namespace Dongke.WinForm.Controls
{
    /// <summary>
    /// 显示标记项的分层集合，每个标记项用一个 TreeNode 来表示。
    /// </summary>
    [ToolboxBitmap(typeof(TreeView))]
    public partial class TvwTreeView : TreeView, IDKControl, IAsyncControl
    {
        #region 成员变量
        /// <summary>
        /// 展开节点的图像的图像列表索引值。
        /// </summary>
        private int _expandImageIndex = -1;
        private int _expandSelectedImageIndex = -1;
        #endregion

        #region 构造函数
        /// <summary>
        /// 显示标记项的分层集合，每个标记项用一个 TreeNode 来表示。
        /// </summary>
        public TvwTreeView()
        {
        }
        #endregion

        #region 属性
        ///// <summary>
        ///// 获取或设置树展开节点显示的默认图像的图像列表索引值。
        ///// </summary>
        //[DefaultValue(-1)]
        //[Editor("System.Windows.Forms.Design.ImageIndexEditor, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(UITypeEditor))]
        //[Localizable(true)]
        //[RefreshProperties(RefreshProperties.Repaint)]
        //[TypeConverter(typeof(NoneExcludedImageIndexConverter))]
        //[RelatedImageList("ImageList")]
        //public int ExpandImageIndex
        //{
        //    get
        //    {
        //        return this._expandImageIndex;
        //    }
        //    set
        //    {
        //        if (this._expandImageIndex != value)
        //        {
        //            this._expandImageIndex = value;
        //            this.SetImageIndex();
        //        }
        //    }
        //}


        #endregion

        #region 重写事件
        /// <summary>
        /// 在选中树节点复选框后发生。
        /// </summary>
        /// <param name="e"></param>
        protected override void OnAfterCheck(TreeViewEventArgs e)
        {
            base.OnAfterCheck(e);

            //if (e.Node.Nodes.Count > 0)
            //{
            //    e.Node
            //}
        }

        #endregion

        #region 私有方法
        /// <summary>
        /// 设置节点的图像的图像列表索引值
        /// </summary>
        private void SetImageIndex()
        {
            this.BeginUpdate();
            this.SetImageIndex(null);
            this.EndUpdate();
        }
        private void SetImageIndex(TreeNode node)
        {
            if (node != null)
            {
                if (node.IsExpanded)
                {
                    node.ImageIndex = this._expandImageIndex;
                    node.SelectedImageIndex = this._expandSelectedImageIndex;
                }
                else
                {
                    node.ImageIndex = -1;
                    node.SelectedImageIndex = -1;
                }

                foreach (TreeNode item in node.Nodes)
                {
                    this.SetImageIndex(item);
                }
            }
            else
            {
                foreach (TreeNode item in this.Nodes)
                {
                    this.SetImageIndex(item);
                }
            }
        }
        #endregion

        #region
        #endregion

        #region IAsyncControl 成员
        #region 成员变量
        /// <summary>
        /// 异步处理开始时，控件状态
        /// </summary>
        private bool _asyncBeginStatus = false;
        private bool _asyncBeginFocused = false;
        #endregion

        #region 公有方法
        /// <summary>
        /// 开始异步处理
        /// </summary>
        /// <param name="doFocus">是否处理焦点</param>
        public virtual void BeginAsync(ref bool doFocus)
        {
            if (doFocus && this.Focused)
            {
                this._asyncBeginFocused = true;
                doFocus = false;
            }
            this._asyncBeginStatus = this.Enabled;
            this.Enabled = false;
        }

        /// <summary>
        /// 结束异步处理
        /// </summary>
        public virtual void EndAsync()
        {
            this.Enabled = this._asyncBeginStatus;
            if (this._asyncBeginFocused)
            {
                this.Focus();
            }
        }
        #endregion
        #endregion
    }
}