当前路径：Cool.Windows.Forms/CoolMenu.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Cool.Windows.Forms
{
    public partial class CoolMenu : UserControl
    {
        public CoolMenu()
        {
            this.DoubleBuffered = true;//设置本窗体
            this.SetStyle(
                      //ControlStyles.UserPaint |    //使用自定义的绘制方式
                      ControlStyles.ResizeRedraw//当控件大小发生变化时就重新绘制
                    | ControlStyles.SupportsTransparentBackColor//则控件接受 alpha 组件数小于 255 个的 BackColor 来模拟透明度
                    | ControlStyles.AllPaintingInWmPaint//则控件忽略窗口消息 WM_ERASEBKGND 以减少闪烁
                    | ControlStyles.OptimizedDoubleBuffer//则控件将首先绘制到缓冲区而不是直接绘制到屏幕，这可以减少闪烁
                    | ControlStyles.DoubleBuffer
                    , true);

            InitializeComponent();
            this.ForeColor = Color.White;
            panelBack = new CoolPanel();
        }

        #region 属性
        [System.ComponentModel.Browsable(true)]
        public int RootIndex { get; set; } = 0;
        [System.ComponentModel.Browsable(true)]
        public int ChildIndex { get; set; } = 0;

        private Color _childPanelBackColor;
        [System.ComponentModel.Browsable(true)]
        public Color ChildPanelBackColor { get => _childPanelBackColor; set => _childPanelBackColor = value; }

        private Color _titleBackColor = Color.FromArgb(00, 0xa3, 0x81);
        [System.ComponentModel.Browsable(true)]
        public Color TitleBackColor { get => _titleBackColor; set => _titleBackColor = value; }

        private Color _childBackColor = Color.FromArgb(00, 0xa3, 0x81);
        [System.ComponentModel.Browsable(true)]
        public Color ChildBackColor { get => _childBackColor; set => _childBackColor = value; }

        private Color _backColor = Color.White;
        [System.ComponentModel.Browsable(true)]
        [DefaultValue(typeof(Color), "Color.White")]
        public new Color BackColor
        {
            get
            {
                return panelBack.BackColor;
            }
            set
            {
                _ba...