当前路径：Cool.Windows.Forms/CoolSearchBox.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Cool.Windows.Forms
{
    public class CoolSearchBox : Control
    {
        public CoolSearchBox()
        {
            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);

            textBox = new CoolTextBox();
            textBox.MouseEnter += TextBox_MouseEnter;
            textBox.MouseLeave += TextBox_MouseLeave;
            textBox.Click += TextBox_Click;
            textBox.LostFocus += TextBox_LostFocus;
            textBox.GotFocus += TextBox_GotFocus;
            textBox.BackColor = Color.FromArgb(255, Color.FromArgb(0x374850));
            this.Controls.Add(textBox);
            this.Size = new Size(Padding.Left + textBox.Width + textBox.Height + Padding.Right + Padding.Right, _padding.Top + textBox.Height + _padding.Bottom);

            textBox.Location = new System.Drawing.Point(_padding.Left, (this.Height - textBox.Height) / 2);
            textBox.Width = this.Width - _padding.Left * 4 - textBox.Height;
            searchRect = new Rectangle(_padding.Left + textBox.Width + _padding.Right, (this.Height - textBox.Height) / 2, textBox.Height + 4, textBox.Height + 4);
            //searchRect.Inflate(4, 4);

            borderRect.X = textBox.Location.X - _padding.Left / 2;
            borderRect.Y = textBox.Location.Y - _padding.Top / 2;
            borderRect.Width = textBox.Width + _padding.Le...