/******************************************************************
  2  * 创 建 人：  SamWang
  3  * 创建时间：  2012-5-10 16:06
  4  * 描    述：
  5  *                移动控件但不改变大小
  6  * 原    理：
  7  * 版    本：  V1.0      
  8  * 环    境：  VS2010
  9 ******************************************************************/
  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Text;
  using System.Windows.Forms;
  using System.Drawing;
using System.Drawing.Drawing2D;

namespace DragControl
  {
      public class MoveControl
      {
          #region Constructors
          public MoveControl(Control ctrl)
          {
              currentControl = ctrl;
              AddEvents();
          }
          #endregion
  
          #region Fields
          private Control currentControl; //传入的控件
          private Point pPoint; //上个鼠标坐标
          private Point cPoint; //当前鼠标坐标
          FrameControl fc;//边框控件
          #endregion
  
          #region Properties
  
          #endregion
  
          #region Methods
          /// <summary>
          /// 挂载事件
          /// </summary>
          private void AddEvents()
          {
              currentControl.MouseClick += new MouseEventHandler(MouseClick);
              currentControl.MouseDown += new MouseEventHandler(MouseDown);
              currentControl.MouseMove += new MouseEventHandler(MouseMove);
              currentControl.MouseUp += new MouseEventHandler(MouseUp);
          }
  
          /// <summary>
          /// 绘制拖拉时的黑色边框
          /// </summary>
          public static void DrawDragBound(Control ctrl)
         {
             ctrl.Refresh();
             Graphics g = ctrl.CreateGraphics();
             int width = ctrl.Width;
              int height = ctrl.Height;
              Point[] ps = new Point[5]{new Point(0,0),new Point(width -1,0),
                  new Point(width -1,height -1),new Point(0,height-1),new Point(0,0)};
              g.DrawLines(new Pen(Color.Black), ps);
          }    
  
          #endregion
  
          #region Events
          /// <summary>
          /// 鼠标单击事件：用来显示边框
          /// </summary>
          /// <param name="sender"></param>
          /// <param name="e"></param>
          protected void MouseClick(object sender, MouseEventArgs e)
          {
              this.currentControl.Parent.Refresh();//刷新父容器，清除掉其他控件的边框
              this.currentControl.BringToFront();
              fc = new FrameControl(this.currentControl);
              this.currentControl.Parent.Controls.Add(fc);
              fc.Visible = true;
              fc.Draw();
          }
  
          /// <summary>
          /// 鼠标按下事件：记录当前鼠标相对窗体的坐标
          /// </summary>
          void MouseDown(object sender, MouseEventArgs e)
          {            
              pPoint = Cursor.Position;               
          }
  
          /// <summary>
          /// 鼠标移动事件：让控件跟着鼠标移动
          /// </summary>
          void MouseMove(object sender, MouseEventArgs e)
          {
              Cursor.Current = Cursors.SizeAll; //当鼠标处于控件内部时，显示光标样式为SizeAll
              //当鼠标左键按下时才触发
              if (e.Button == MouseButtons.Left)
             {
                 MoveControl.DrawDragBound(this.currentControl);
                 if(fc != null ) fc.Visible = false; //先隐藏
                 cPoint = Cursor.Position;//获得当前鼠标位置
                 int x = cPoint.X - pPoint.X;
                 int y = cPoint.Y - pPoint.Y;
                 currentControl.Location = new Point(currentControl.Location.X + x, currentControl.Location.Y + y);
                 pPoint = cPoint;
             }
         }
 
         /// <summary>
         /// 鼠标弹起事件：让自定义的边框出现
         /// </summary>
         void MouseUp(object sender, MouseEventArgs e)
         {
             this.currentControl.Refresh();
             if (fc != null)
             {
                     fc.Visible = true;
                    fc.Draw();
                 }
         }
         #endregion
     }
 }



  /******************************************************************
  2  * 创 建 人：  SamWang
  3  * 创建时间：  2012-5-10 17:00
  4  * 描    述：
  5  *                在控件外部加上边框，用于拖拉，以改变内部控件的大小
  6  * 原    理：
  7  * 版    本：  V1.0      
  8  * 环    境：  VS2010
  9 ******************************************************************/
  using System;
  using System.Collections.Generic;
  using System.Text;
  using System.Windows.Forms;
  using System.Drawing;
  using System.Drawing.Drawing2D;
  
  namespace DragControl
  {
      public class FrameControl : UserControl
      {
          #region Constructors
          /// <summary>
          /// 构造函数
          /// </summary>
          public FrameControl(Control ctrl)
          {
              baseControl = ctrl;
              AddEvents();
              CreateBounds();
          }
          #endregion
  
          #region Fields
          const int Band = 6; //调整大小的响应边框
          private int MinWidth = 20; //最小宽度
          private int MinHeight = 20;//最小高度
          Size square = new Size(Band, Band);//小矩形大小
          Control baseControl; //基础控件，即被包围的控件
          Rectangle[] smallRects = new Rectangle[8];//边框中的八个小圆圈
          Rectangle[] sideRects = new Rectangle[4];//四条边框，用来做响应区域
          Point[] linePoints = new Point[5];//四条边，用于画虚线
          Graphics g; //画图板
          Rectangle ControlRect; //控件包含边框的区域  
          private Point pPoint; //上个鼠标坐标
          private Point cPoint; //当前鼠标坐标
          private MousePosOnCtrl mpoc;
          #endregion
  
          #region Properties
          /// <summary>
          /// 鼠标在控件中位置
          /// </summary>
          enum MousePosOnCtrl
          {
              NONE = 0,
              TOP = 1,
              RIGHT = 2,
              BOTTOM = 3,
              LEFT = 4,
              TOPLEFT = 5,
              TOPRIGHT = 6,
              BOTTOMLEFT = 7,
              BOTTOMRIGHT = 8,
          }
          #endregion
  
          #region Methods
          /// <summary>
          /// 加载事件
          /// </summary>
          private void AddEvents()
          {
              this.Name = "FrameControl" + baseControl.Name;
              this.MouseDown += new MouseEventHandler(FrameControl_MouseDown);
              this.MouseMove += new MouseEventHandler(FrameControl_MouseMove);
              this.MouseUp += new MouseEventHandler(FrameControl_MouseUp);
          }
  
          #region 创建边框
          /// <summary>
          /// 建立控件可视区域
          /// </summary>
          private void CreateBounds()
          {
              //创建边界
              int X = baseControl.Bounds.X - square.Width - 1;
              int Y = baseControl.Bounds.Y - square.Height - 1;
              int Height = baseControl.Bounds.Height + (square.Height * 2) + 2;
              int Width = baseControl.Bounds.Width + (square.Width * 2) + 2;
              this.Bounds = new Rectangle(X, Y, Width, Height);
              this.BringToFront();
              SetRectangles();
              //设置可视区域
             this.Region = new Region(BuildFrame());
              g = this.CreateGraphics();
          }
  
          /// <summary>
          /// 设置定义8个小矩形的范围
         /// </summary>
         void SetRectangles()
         {
             //左上
             smallRects[0] = new Rectangle(new Point(0, 0), square);
             //右上
             smallRects[1] = new Rectangle(new Point(this.Width - square.Width - 1, 0), square);
             //左下
             smallRects[2] = new Rectangle(new Point(0, this.Height - square.Height - 1), square);
             //右下
             smallRects[3] = new Rectangle(new Point(this.Width - square.Width - 1, this.Height - square.Height - 1), square);
             //上中
             smallRects[4] = new Rectangle(new Point(this.Width / 2 - 1, 0), square);
             //下中
            smallRects[5] = new Rectangle(new Point(this.Width / 2 - 1, this.Height - square.Height - 1), square);
             //左中
             smallRects[6] = new Rectangle(new Point(0, this.Height / 2 - 1), square);
             //右中
             smallRects[7] = new Rectangle(new Point(square.Width + baseControl.Width + 1, this.Height / 2 - 1), square);
 
             //四条边线
             //左上
             linePoints[0] = new Point(square.Width / 2, square.Height / 2);
             //右上
             linePoints[1] = new Point(this.Width - square.Width / 2 - 1, square.Height / 2);
             //右下
             linePoints[2] = new Point(this.Width - square.Width / 2 - 1, this.Height - square.Height / 2);
             //左下
             linePoints[3] = new Point(square.Width / 2, this.Height - square.Height / 2 - 1);
             //左上
             linePoints[4] = new Point(square.Width / 2, square.Height / 2);
 
             //整个包括周围边框的范围
             ControlRect = new Rectangle(new Point(0, 0), this.Bounds.Size);
         }
 
         /// <summary>
         /// 设置边框控件可视区域
         /// </summary>
         /// <returns></returns>
         private GraphicsPath BuildFrame()
         {
             GraphicsPath path = new GraphicsPath();
             //上边框
             sideRects[0] = new Rectangle(0, 0, this.Width - square.Width - 1, square.Height + 1);
             //左边框
             sideRects[1] = new Rectangle(0, square.Height + 1, square.Width + 1, this.Height - square.Height - 1);
             //下边框
             sideRects[2] = new Rectangle(square.Width + 1, this.Height - square.Height - 1, this.Width - square.Width - 1, square.Height + 1);
             //右边框
             sideRects[3] = new Rectangle(this.Width - square.Width - 1, 0, square.Width + 1, this.Height - square.Height - 1);
 
             path.AddRectangle(sideRects[0]);
             path.AddRectangle(sideRects[1]);
             path.AddRectangle(sideRects[2]);
             path.AddRectangle(sideRects[3]);
            return path;
         }
         #endregion
 
         /// <summary>
         /// 绘图
         /// </summary>
         public void Draw()
         {
             this.BringToFront();
             //g.FillRectangles(Brushes.LightGray, sideRects); //填充四条边框的内部
            Pen pen = new Pen(Color.Black);
             pen.DashStyle = DashStyle.Dot;//设置为虚线,用虚线画四边，模拟微软效果
             g.DrawLines(pen, linePoints);//绘制四条边线
             g.FillRectangles(Brushes.White, smallRects); //填充8个小矩形的内部
             foreach (Rectangle smallRect in smallRects)
             {
                 g.DrawEllipse(Pens.Black, smallRect);    //绘制8个小椭圆
             }
             //g.DrawRectangles(Pens.Black, smallRects);  //绘制8个小矩形的黑色边线
         }
 
         /// <summary>
         /// 设置光标状态
         /// </summary>
         public bool SetCursorShape(int x, int y)
         {
             Point point = new Point(x, y);
             if (!ControlRect.Contains(point))
             {
                 Cursor.Current = Cursors.Arrow;
                 return false;
             }
             else if (smallRects[0].Contains(point))
             {
                 Cursor.Current = Cursors.SizeNWSE;
                 mpoc = MousePosOnCtrl.TOPLEFT;
             }
             else if (smallRects[1].Contains(point))
             {
                 Cursor.Current = Cursors.SizeNESW;
                 mpoc = MousePosOnCtrl.TOPRIGHT;
             }
             else if (smallRects[2].Contains(point))
             {
                 Cursor.Current = Cursors.SizeNESW;
                 mpoc = MousePosOnCtrl.BOTTOMLEFT;
             }
             else if (smallRects[3].Contains(point))
             {
                 Cursor.Current = Cursors.SizeNWSE;
                 mpoc = MousePosOnCtrl.BOTTOMRIGHT;
             }
             else if (sideRects[0].Contains(point))
             {
                 Cursor.Current = Cursors.SizeNS;
                 mpoc = MousePosOnCtrl.TOP;
             }
             else if (sideRects[1].Contains(point))
             {
                 Cursor.Current = Cursors.SizeWE;
                 mpoc = MousePosOnCtrl.LEFT;
            }
             else if (sideRects[2].Contains(point))
             {
                 Cursor.Current = Cursors.SizeNS;
                 mpoc = MousePosOnCtrl.BOTTOM;
             }
             else if (sideRects[3].Contains(point))
             {
                 Cursor.Current = Cursors.SizeWE;
                 mpoc = MousePosOnCtrl.RIGHT;
             }
             else
            {
                 Cursor.Current = Cursors.Arrow;
             }
             return true;
         }
 
         /// <summary>
         /// 控件移动
         /// </summary>
         private void ControlMove()
         {
             cPoint = Cursor.Position;
             int x = cPoint.X - pPoint.X;
             int y = cPoint.Y - pPoint.Y;
             switch (this.mpoc)
             {
                 case MousePosOnCtrl.TOP:
                     if (baseControl.Height - y > MinHeight)
                     {
                         baseControl.Top += y;
                         baseControl.Height -= y;
                     }
                     else
                     {
                         baseControl.Top -= MinHeight - baseControl.Height;
                         baseControl.Height = MinHeight;
                     }
                     break;
                 case MousePosOnCtrl.BOTTOM:
                     if (baseControl.Height + y > MinHeight)
                     {
                         baseControl.Height += y;
                     }
                     else
                     {
                         baseControl.Height = MinHeight;
                     }
                     break;
                 case MousePosOnCtrl.LEFT:
                     if (baseControl.Width - x > MinWidth)
                     {
                         baseControl.Left += x;
                         baseControl.Width -= x;
                     }
                     else
                     {
                         baseControl.Left -= MinWidth - baseControl.Width;
                         baseControl.Width = MinWidth;
                     }

                     break;
                 case MousePosOnCtrl.RIGHT:
                     if (baseControl.Width + x > MinWidth)
                     {
                         baseControl.Width += x;
                     }
                     else
                    {
                         baseControl.Width = MinWidth;
                     }
                     break;
                 case MousePosOnCtrl.TOPLEFT:
                     if (baseControl.Height - y > MinHeight)
                     {
                         baseControl.Top += y;
                         baseControl.Height -= y;
                     }
                     else
                     {
                         baseControl.Top -= MinHeight - baseControl.Height;
                         baseControl.Height = MinHeight;
                     }
                     if (baseControl.Width - x > MinWidth)
                     {
                         baseControl.Left += x;
                         baseControl.Width -= x;
                     }
                     else
                     {
                         baseControl.Left -= MinWidth - baseControl.Width;
                         baseControl.Width = MinWidth;
                     }
                     break;
                 case MousePosOnCtrl.TOPRIGHT:
                     if (baseControl.Height - y > MinHeight)
                     {
                         baseControl.Top += y;
                         baseControl.Height -= y;
                     }
                     else
                     {
                         baseControl.Top -= MinHeight - baseControl.Height;
                         baseControl.Height = MinHeight;
                     }
                     if (baseControl.Width + x > MinWidth)
                     {
                         baseControl.Width += x;
                     }
                     else
                     {
                         baseControl.Width = MinWidth;
                     }
                     break;
                 case MousePosOnCtrl.BOTTOMLEFT:
                     if (baseControl.Height + y > MinHeight)
                     {
                         baseControl.Height += y;
                     }
                     else
                    {
                         baseControl.Height = MinHeight;
                     }
                     if (baseControl.Width - x > MinWidth)
                     {
                         baseControl.Left += x;
                         baseControl.Width -= x;
                     }
                     else
                     {
                         baseControl.Left -= MinWidth - baseControl.Width;
                         baseControl.Width = MinWidth;
                     }
                     break;
                 case MousePosOnCtrl.BOTTOMRIGHT:
                     if (baseControl.Height + y > MinHeight)
                     {
                         baseControl.Height += y;
                     }
                     else
                     {
                         baseControl.Height = MinHeight;
                     }
                     if (baseControl.Width + x > MinWidth)
                     {
                         baseControl.Width += x;
                     }
                     else
                     {
                         baseControl.Width = MinWidth;
                     }
                     break;

             }
             pPoint = Cursor.Position;
         }        
 
         #endregion
 
         #region Events
         /// <summary>
         /// 鼠标按下事件：记录当前鼠标相对窗体的坐标
         /// </summary>
         void FrameControl_MouseDown(object sender, MouseEventArgs e)
         {
             pPoint = Cursor.Position;
         }
 
        /// <summary>
         /// 鼠标移动事件：让控件跟着鼠标移动
         /// </summary>
         void FrameControl_MouseMove(object sender, MouseEventArgs e)
         {
             if (e.Button == MouseButtons.Left)
             {
                 this.Visible = false;
                 MoveControl.DrawDragBound(baseControl);
                 ControlMove();
             }
             else
             {
                 this.Visible = true;
                 SetCursorShape(e.X, e.Y); //更新鼠标指针样式
             }
         }
 
         /// <summary>
         /// 鼠标弹起事件：让自定义的边框出现
         /// </summary>
         void FrameControl_MouseUp(object sender, MouseEventArgs e)
         {
             this.baseControl.Refresh(); //刷掉黑色边框
             this.Visible = true;
             CreateBounds();
             Draw();
         }
         #endregion
     }
 }