KJD_WebService/TEMUKJD/UserComponent/UcComboBoxMutiSelect .cs

using NaiBa.Util.Extension;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace TemuKJD.UserComponent
{
    public partial class UcComboBoxMutiSelect : ComboBox
    {
        //private bool _IsMultiSelect;
        //public bool IsMultiSelect { get => _IsMultiSelect; set => _IsMultiSelect = value; }

        public string DefaultText { get; set; } = "全部";

        public List<object> SelectItems
        {
            get
            {
                if (this.checkedListBox == null)
                    return this.Items.Cast<object>().ToList();

                List<object> lstObj = new List<object>();
                for (int i = 0; i < checkedListBox.Items.Count; i++)
                {
                    if (checkedListBox.GetItemChecked(i))
                    {
                        lstObj.Add(checkedListBox.Items[i]);
                    }
                }
                return lstObj;
            }
        }

        CheckedListBox checkedListBox = null;
        public UcComboBoxMutiSelect()
        {
            SetStyle(ControlStyles.DoubleBuffer |
            ControlStyles.OptimizedDoubleBuffer |
            ControlStyles.AllPaintingInWmPaint, true);
            UpdateStyles();

            this.DropDown += UcComboBoxMutiSelect_DropDown;
            //this.DropDownClosed += UcComboBoxMutiSelect_DropDownClosed;
        }

        private void UcComboBoxMutiSelect_DropDownClosed(object sender, EventArgs e)
        {
            if (checkedListBox != null)
                checkedListBox.Visible = false;
        }

        private void UcComboBoxMutiSelect_DropDown(object sender, EventArgs e)
        {
            this.DropDownHeight = 1;

            if (checkedListBox == null)
            {
                checkedListBox = new CheckedListBox();
                checkedListBox.Visible = false;
                checkedListBox.CheckOnClick = true;
                checkedListBox.ItemCheck += checkedListBox_ItemCheck;
                checkedListBox.MouseLeave += checkedListBox_MouseLeave;
                checkedListBox.MouseEnter += CheckedListBox_MouseEnter;
                checkedListBox.MouseMove += CheckedListBox_MouseMove;
                //checkedListBox.MouseUp += new MouseEventHandler(this.checkedListBox_MouseUp);

                Point point = new Point();
                point.X = this.Left;
                point.Y = this.Top + this.Height;
                var parentForm = this.Parent;
                while (!(parentForm is Form))
                {
                    point.X += parentForm.Left;
                    point.Y += parentForm.Top;
                    parentForm = parentForm.Parent;
                }
                parentForm.Controls.Add(checkedListBox);
                checkedListBox.Location = point;
                checkedListBox.Size = new Size(Math.Max(80, this.Width), 100);
            }

            string str1 = string.Join(",", this.Items.Cast<object>().Select(o => o.ParseToString()));
            string str2 = string.Join(",", this.checkedListBox.Items.Cast<object>().Select(o => o.ParseToString()));
            if (str1 != str2)
            {
                checkedListBox.Items.Clear();
                foreach (var item in this.Items)
                {
                    checkedListBox.Items.Add(item.ParseToString(), true);
                }
            }

            this.FindForm().ActiveControl = checkedListBox;
            checkedListBox.Visible = true;
            checkedListBox.BringToFront();
        }

        private void CheckedListBox_MouseMove(object sender, MouseEventArgs e)
        {
            //this.DropDownClosed -= UcComboBoxMutiSelect_DropDownClosed;
        }

        private void CheckedListBox_MouseEnter(object sender, EventArgs e)
        {
            //this.DropDownClosed -= UcComboBoxMutiSelect_DropDownClosed;
        }

        private void checkedListBox_MouseLeave(object sender, EventArgs e)
        {
            ////this.DropDownClosed += UcComboBoxMutiSelect_DropDownClosed;
            ////统计选取的项目
            //string str = "";
            //for (int i = 0; i < checkedListBox.Items.Count; i++)
            //{
            //    if (checkedListBox.GetItemChecked(i))
            //    {
            //        str += $"{checkedListBox.Items[i].ParseToString()};";
            //    }
            //}
            //this.Text = str;
            checkedListBox.Visible = false;
            this.OnDropDownClosed(null);
        }

        private void checkedListBox_ItemCheck(object sender, EventArgs e)
        {
            //统计选取的项目

            Task.Run(() =>
            {
                Thread.Sleep(100);
                Invoke(new Action(() =>
                {
                    string str = "";
                    for (int i = 0; i < checkedListBox.Items.Count; i++)
                    {
                        if (checkedListBox.GetItemChecked(i))
                        {
                            str += $"{checkedListBox.Items[i].ParseToString()};";
                        }
                    }
                    this.Text = str;


                    string str1 = string.Join(";", this.Items.Cast<object>().Select(o => o.ParseToString()));
                    if (this.Text.Trim(';') == str1)
                    {
                        this.Text = this.DefaultText;
                    }
                }));
            });

        }
    }
}