1.使用鼠标控制位置：在任意位置点击左键拖动

2.使用鼠标控制大小：在控件右下角待变为‘调整光标’是可以调整大小

3.使用键盘控制位置：alt + 方向键

4.使用键盘控制大小：ctrl + 方向键

using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;


namespace AppGenCode.Printer
{


  public enum EnumAdjust
  {
    Nothing =0,
    Size = 1,
    Postion = 2
  }


  public partial class AdjustTextBox : TextBox
  {
    public AdjustTextBox()
    {
      InitializeComponent();
      InitCtrl();
    }


    public AdjustTextBox(IContainer container)
    {
      container.Add(this);
      InitializeComponent();
      InitCtrl();
    }


    private bool m_isMoving = false;
    private Point m_offset = new Point(0,0);
    private Size m_intSize = new Size(0, 0);
    private EnumAdjust m_adjust = EnumAdjust.Nothing;
    private int m_x, m_y, m_w, m_h = 0;


    private Rectangle RecAdjustSize
    {
      get { return new Rectangle(this.Width-15,this.Height-15,15,15);}
    }
    private Rectangle RecAdjustPostion
    {
      get { return new Rectangle(0, 0, this.Width, this.Height); }
    }


    private void InitCtrl()
    {
      this.Text = "asdf1234";
      this.Multiline = true;
      this.BorderStyle = BorderStyle.FixedSingle;
      this.ReadOnly = true;
    }
    #region 鼠标事件
    protected override void OnMouseDown(MouseEventArgs e)
    {
      m_isMoving = true;
      m_offset = new Point(e.X, e.Y);
      m_intSize.Width = this.Width;
      m_intSize.Height = this.Height;


      if (RecAdjustSize.Contains(e.X, e.Y)) //调整大小
      {
        this.Cursor = Cursors.SizeNWSE;
        m_adjust = EnumAdjust.Size;
      }
      else if (RecAdjustPostion.Contains(e.X, e.Y)) //调整位置
      {
        this.Cursor = Cursors.SizeAll;
        m_adjust = EnumAdjust.Postion;
      }
      else
      {
        m_adjust = EnumAdjust.Nothing;
      }
      base.OnMouseDown(e);
    }
    protected override void OnMouseUp(MouseEventArgs mevent)
    {
      Cursor = Cursors.Default;
      m_isMoving = false;
      
      base.OnMouseUp(mevent);
    }
    protected override void OnMouseMove(MouseEventArgs e)
    {
      CursorCtrl(e.X, e.Y);
      m_x = this.Left;
      m_y = this.Top;
      m_w = this.Width;
      m_h = this.Height;
      if (m_isMoving)
      {
        switch (m_adjust)
        {
          case EnumAdjust.Size:
            m_w = m_intSize.Width + (e.X - m_offset.X);
            m_h = m_intSize.Height + (e.