/// <summary>
 /// 拖动鼠标移动Form窗体，移动Panel面板通用类
 /// </summary>
 public class FormDragDrop
 {
     private Point _MouseOffset;
     private bool _IsMouseDown = false;
     private Control _container;
     private Control _handleControl;

     /// <summary>
     /// 主方法
     /// </summary>
     /// <param name="dragControl">拖动的组件(容器或窗体)</param>
     /// <param name="container">容器或窗体</param>
     public static void Handle(Control dragControl, Control container)
     {
         FormDragDrop handle = new FormDragDrop
         {
             _handleControl = dragControl,
             _container = container
         };
         handle.HandleEvents();
     }

     /// <summary>
     /// 绑定事件
     /// </summary>
     private void HandleEvents()
     {
         _handleControl.MouseDown += On_MouseDown;
         _handleControl.MouseMove += On_MouseMove;
         _handleControl.MouseUp += On_MouseUp;
     }

     /// <summary>
     /// 按下鼠标
     /// </summary>
     /// <param name="sender"></param>
     /// <param name="e"></param>
     private void On_MouseDown(object sender, MouseEventArgs e)
     {
         int xOffset;
         int yOffset;

         //鼠标点击组件或窗体的坐标
         if (e.Button == MouseButtons.Left)
         {
             if (_container is Form)
             {
                 xOffset = -e.X;
                 yOffset = -e.Y;
                 _MouseOffset = new Point(xOffset, yOffset);
             }
             else
             {
                 xOffset = e.X;
                 yOffset = e.Y;
                 _MouseOffset = new Point(xOffset, yOffset);
             }

             _IsMouseDown = true;
         }
     }

     Point _CurrentTempPoint;

     /// <summary>
     /// 移动鼠标
     /// </summary>
     /// <param name="sender"></param>
     /// <param name="e"></param>
     private void On_MouseMove(object sender, MouseEventArgs e)
     {
         if (_IsMouseDown)
         {
             if (_container is Form)
             {
                 _CurrentTempPoint = Control.MousePosition; //鼠标位置在屏幕的坐标
                 _CurrentTempPoint.Offset(_MouseOffset.X, _MouseOffset.Y);
                 _container.Location = _CurrentTempPoint;
             }
             else
             {
                 var x = e.Location.X - _MouseOffset.X;
                 var y = e.Location.Y - _MouseOffset.Y;

                 _CurrentTempPoint = _container.Location;
                 _CurrentTempPoint.Offset(x, y);

                 _container.Location = _CurrentTempPoint;
             }
         }
     }

     /// <summary>
     /// 释放鼠标
     /// </summary>
     /// <param name="sender"></param>
     /// <param name="e"></param>
     private void On_MouseUp(object sender, MouseEventArgs e)
     {
         if (e.Button == MouseButtons.Left)
         {
             _IsMouseDown = false;
         }
     }

 }

 //拖拽主窗体
 FormDragDrop.Handle(this.pnlTitle, this);

//拖拽工具箱面板
FormDragDrop.Handle(pnlToolTitle, pnlTool);