DonkingControlBase/LookupEditor/LookupEditor.cs

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/*
 * Author donking
 * http://www.donking-ch.com/ 
 */

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Reflection;

namespace DonkingControlBase
{
    /// <summary>
    /// 自定义LookupEditor,实现INotifyPropertyChanged接口，当值改变执行数据绑定及查询
    /// </summary>
    public partial class LookupEditor : UserControl, INotifyPropertyChanged
    {
        public delegate bool ValueChangeHandler(object sender);
        public event ValueChangeHandler ChangeEvent;

        public string _DisplayMember { set; get; }
        private string _text;//文本值
        private object _target;

        #region
        PopupControlHost normoalHost;//ToolStripDropDown下拉控件        
        LookupContext lookupContext = new LookupContext();//自定义数据控件       
        private bool isOpen = false;       
        private MessageFilter mf;
        private Point hostPoint;//弹出菜单全局位置       
        private bool _isOpen = true;//开关       
        #endregion

        #region PopupControlHost
        private bool _ChangeRegion = false;
        private Double _Opacity = 1.0F; //透明度
        private bool _CanResize = true;//改变大小        
        private bool _OpenFocused = false;
        #endregion       

        /// <summary>
        /// 显示文本框的值
        /// </summary>
        public string DisplayValue
        {
            get { return this.textBox.Text; }
            set { textBox.Text = value; }
        }

        /// <summary>
        /// 用于保存对象
        /// </summary>
        public object Target
        {
            get { return _target; }