c#自定义可拖动变形控件

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;

namespace util
{
    public class 控件移动变形类 : UserControl  //控件类
    {
        Rectangle 传递控件;//传递控件相对于本控件的范围
        Rectangle 本控件;//本控件相对于自己的范围
        Rectangle[] 调节点边框 = new Rectangle[8];//8个点相对于本控件的范围
        Rectangle[] 调节框边框 = new Rectangle[4];//4个调节框相对于本控件的范围，封闭曲线
        Size 调节点大小 = new Size(6, 6);
        Graphics g;
        Control 当前控件;
        //保存鼠标单击的位置，以备释放鼠标时计算距离
        Point prevLeftClick;
        bool 已经绘出 = false;

        enum 调节点列表
        {
            HDS_NONE = 0,
            HDS_TOP = 1,
            HDS_RIGHT = 2,
            HDS_BOTTOM = 3,
            HDS_LEFT = 4,
            HDS_TOPLEFT = 5,
            HDS_TOPRIGHT = 6,
            HDS_BOTTOMLEFT = 7,
            HDS_BOTTOMRIGHT = 8
        }
        private 调节点列表 CurrHitPlace;
        public 控件移动变形类(Control theControl)
        {
            InitializeComponent();
            当前控件 = theControl;
            Create();
        }
        private void InitializeComponent()
        {
            this.BackColor = System.Drawing.Color.Wheat;
            this.Name = "TestMoveAndResizeControl";
            this.Paint += new System.Windows.Forms.PaintEventHandler(this.RectTracker_Paint);
            this.MouseMove += new System.Windows.Forms.MouseEventHandler(this.RectTracker_MouseMove);
            this.MouseUp += new System.Windows.Forms.MouseEventHandler(this.RectTracker_MouseUp);
        }
        private void Create()
        {
            //创建边界
            int X = 当前控件.Bounds.X - 调节点大小.Width;
            int Y = 当前控件.Bounds.Y - 调节点大小.Height;
            int Height = 当前控件.Bounds.Height + (调节点大小.Height * 2);
            int Width = 当前控件.Bounds.Width + (调节点大小.Width * 2);
            this.Bounds = new Rectangle(X, Y, Width + 1, Height + 1);//本控件相对于窗体的范围
            this.BringToFront();
            Rect = 当前控件.Bounds;
            //设置可视区域
            this.Region = new Region(创建包含区域());
            g = this.CreateGraphics();//创建画笔
            控件重画();//控件显示
        }
        public Rectangle Rect
        {
            get { return 传递控件; }
            set
            {
                int X = 调节点大小.Width;
                int Y = 调节点大小.Height;
                int Height = value.Height;
                int Width = value.Width;
                传递控件 = new Rectangle(X, Y, Width, Height);
                SetRectangles();
            }
        }

        void SetRectangles()
        {
            //定义8个小正方形的范围
            //左上
            调节点边框[0] = new Rectangle(new Point(传递控件.X - 调节点大小.Width, 传递控件.Y - 调节点大小.Height), 调节点大小);
            //上中间
            调节点边框[4] = new Rectangle(new Point(传递控件.X + (传递控件.Width / 2) - (调节点大小.Width / 2), 传递控件.Y - 调节点大小.Height), 调节点大小);
            //右上
            调节点边框[1] = new Rectangle(new Point(传递控件.X + 传递控件.Width, 传递控件.Y - 调节点大小.Height), 调节点大小);
            //左下
            调节点边框[2] = new Rectangle(new Point(传递控件.X - 调节点大小.Width, 传递控件.Y + 传递控件.Height), 调节点大小);
            //下中间
            调节点边框[5] = new Rectangle(new Point(传递控件.X + (传递控件.Width / 2) - (调节点大小.Width / 2), 传递控件.Y + 传递控件.Height), 调节点大小);
            //右下
            调节点边框[3] = new Rectangle(new Point(传递控件.X + 传递控件.Width, 传递控件.Y + 传递控件.Height), 调节点大小);
            //左中间
            调节点边框[6] = new Rectangle(new Point(传递控件.X - 调节点大小.Width, 传递控件.Y + (传递控件.Height / 2) - (调节点大小.Height / 2)), 调节点大小);
            //右中间
            调节点边框[7] = new Rectangle(new Point(传递控件.X + 传递控件.Width, 传递控件.Y + (传递控件.Height / 2) - (调节点大小.Height / 2)), 调节点大小);

            //整个包括周围边框的范围
            本控件 = new Rectangle(new Point(0, 0), this.Bounds.Size);
        }
        private GraphicsPath 创建包含区域()
        {
            GraphicsPath path = new GraphicsPath();
            调节框边框[0] = new Rectangle(0, 0, 当前控件.Width + (调节点大小.Width * 2) + 1, 调节点大小.Height + 1);
            调节框边框[1] = new Rectangle(0, 调节点大小.Height + 1, 调节点大小.Width + 1, 当前控件.Bounds.Height + 调节点大小.Height + 1);
            调节框边框[2] = new Rectangle(调节点大小.Width + 1, 当前控件.Bounds.Height + 调节点大小.Height - 1, 当前控件.Width + 调节点大小.Width + 2, 调节点大小.Height + 2);
            调节框边框[3] = new Rectangle(当前控件.Width + 调节点大小.Width - 1, 调节点大小.Height + 1, 调节点大小.Width + 2, 当前控件.Height - 1);
            path.AddRectangle(调节框边框[0]);
            path.AddRectangle(调节框边框[1]);
            path.AddRectangle(调节框边框[2]);
            path.AddRectangle(调节框边框[3]);
            return path;
        }
        public void 控件重画()
        {
            try
            {
                g.FillRectangles(Brushes.LightGray, 调节框边框); //填充用于调整的边框的内部
                g.FillRectangles(Brushes.White, 调节点边框); //填充8个锚点的内部
                g.DrawRectangles(Pens.Black, 调节点边框); //绘制8个锚点的黑色边线
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }
       

        private void RectTracker_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                if (已经绘出 == false)
                {
                    prevLeftClick = new Point(e.X, e.Y);
                    已经绘出 = true;
                }
                else
                {
                    this.Visible = false;
                    Mouse_Move(this, e); //调整位置或大小
                    prevLeftClick = new Point(e.X, e.Y);
                }
            }
            else
            {
                已经绘出 = false;
                this.Visible = true;
                更改指针样式(e.X, e.Y); //更新鼠标指针样式
            }
        }

        private void RectTracker_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            Create();
            this.Visible = true;
        }
        private void RectTracker_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
        {
            //画边框
            控件重画();
        }
        public bool 更改指针样式(int x, int y)
        {
            Point point = new Point(x, y);
            if (!本控件.Contains(point))
            {
                Cursor.Current = Cursors.Arrow;
                return false;
            }
            else if (调节点边框[0].Contains(point))
            {
                Cursor.Current = Cursors.SizeNWSE;
                CurrHitPlace = 调节点列表.HDS_TOPLEFT;
            }
            else if (调节点边框[3].Contains(point))
            {
                Cursor.Current = Cursors.SizeNWSE;
                CurrHitPlace = 调节点列表.HDS_BOTTOMRIGHT;
            }
            else if (调节点边框[1].Contains(point))
            {
                Cursor.Current = Cursors.SizeNESW;
                CurrHitPlace = 调节点列表.HDS_TOPRIGHT;
            }
            else if (调节点边框[2].Contains(point))
            {
                Cursor.Current = Cursors.SizeNESW;
                CurrHitPlace = 调节点列表.HDS_BOTTOMLEFT;
            }
            else if (调节点边框[4].Contains(point))
            {
                Cursor.Current = Cursors.SizeNS;
                CurrHitPlace = 调节点列表.HDS_TOP;
            }
            else if (调节点边框[5].Contains(point))
            {
                Cursor.Current = Cursors.SizeNS;
                CurrHitPlace = 调节点列表.HDS_BOTTOM;
            }
            else if (调节点边框[6].Contains(point))
            {
                Cursor.Current = Cursors.SizeWE;
                CurrHitPlace = 调节点列表.HDS_LEFT;
            }
            else if (调节点边框[7].Contains(point))
            {
                Cursor.Current = Cursors.SizeWE;
                CurrHitPlace = 调节点列表.HDS_RIGHT;
            }
            else if (本控件.Contains(point))
            {
                Cursor.Current = Cursors.SizeAll;
                CurrHitPlace = 调节点列表.HDS_NONE;
            }
            return true;
        }
        public void Mouse_Move(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            //控件最小为 8x8
            if (当前控件.Height < 8)
            {
                当前控件.Height = 8;
                return;
            }
            else if (当前控件.Width < 8)
            {
                当前控件.Width = 8;
                return;
            }
            switch (this.CurrHitPlace)
            {
                case 调节点列表.HDS_TOP:
                    当前控件.Height = 当前控件.Height - e.Y + prevLeftClick.Y;
                    if (当前控件.Height > 8)
                        当前控件.Top = 当前控件.Top + e.Y - prevLeftClick.Y;
                    break;
                case 调节点列表.HDS_TOPLEFT:
                    当前控件.Height = 当前控件.Height - e.Y + prevLeftClick.Y;
                    if (当前控件.Height > 8)
                        当前控件.Top = 当前控件.Top + e.Y - prevLeftClick.Y;
                    当前控件.Width = 当前控件.Width - e.X + prevLeftClick.X;
                    if (当前控件.Width > 8)
                        当前控件.Left = 当前控件.Left + e.X - prevLeftClick.X;
                    break;
                case 调节点列表.HDS_TOPRIGHT:
                    当前控件.Height = 当前控件.Height - e.Y + prevLeftClick.Y;
                    if (当前控件.Height > 8)
                        当前控件.Top = 当前控件.Top + e.Y - prevLeftClick.Y;
                    当前控件.Width = 当前控件.Width + e.X - prevLeftClick.X;
                    break;
                case 调节点列表.HDS_RIGHT:
                    当前控件.Width = 当前控件.Width + e.X - prevLeftClick.X;
                    break;
                case 调节点列表.HDS_BOTTOM:
                    当前控件.Height = 当前控件.Height + e.Y - prevLeftClick.Y;
                    break;
                case 调节点列表.HDS_BOTTOMLEFT:
                    当前控件.Height = 当前控件.Height + e.Y - prevLeftClick.Y;
                    当前控件.Width = 当前控件.Width - e.X + prevLeftClick.X;
                    if (当前控件.Width > 8)
                        当前控件.Left = 当前控件.Left + e.X - prevLeftClick.X;
                    break;
                case 调节点列表.HDS_BOTTOMRIGHT:
                    当前控件.Height = 当前控件.Height + e.Y - prevLeftClick.Y;
                    当前控件.Width = 当前控件.Width + e.X - prevLeftClick.X;
                    break;
                case 调节点列表.HDS_LEFT:
                    当前控件.Width = 当前控件.Width - e.X + prevLeftClick.X;
                    if (当前控件.Width > 8)
                        当前控件.Left = 当前控件.Left + e.X - prevLeftClick.X;
                    break;
                case 调节点列表.HDS_NONE:
                    当前控件.Location = new Point(当前控件.Location.X + e.X - prevLeftClick.X, 当前控件.Location.Y + e.Y - prevLeftClick.Y);
                    break;
            }
        }

    }
}