要想玩转Winform自定义控件需要对GDI+非常熟悉，对常用的控件有一些了解，好选择合适的基类控件来简化。

要点说明及代码

1)定义接口：

using System;using System.Windows.Forms;namespace GDIPrinterDriver{    /// 
    /// 模板元素接口    /// 
    public interface ILabelDesignElement    {        /// 
        /// PrintData/codeContext里的字段，{} []         /// 
        string 动态内容 { get; set; }        /// 
        /// 是否被选中        /// 
        bool DesignSelected { get; set; }        /// 
        /// 选择状态发生改变        /// 
        event Action
     
       SelectedStatusChange;        /// 
      
        /// 本控件被选中时键盘方向键被按下        /// 
        /// 
              void KeysChangedLocation(Keys keyData);    }}
     

2)控件基类实现：

using GDIPrinterDriver;using System;using System.ComponentModel;using System.Drawing;using System.Drawing.Drawing2D;using System.Drawing.Imaging;using System.Windows.Forms;namespace GDILabelDesigner{    /// 
    /// 设计时控件基类    /// 
    public abstract class DesignCellControl : PictureBox, ILabelDesignElement    {        #region 鼠标移动和缩放        private enum EnumMousePointPosition        {            MouseSizeNone = 0, //'无                MouseSizeRight = 1, //'拉伸右边框                MouseSizeLeft = 2, //'拉伸左边框                MouseSizeBottom = 3, //'拉伸下边框                MouseSizeTop = 4, //'拉伸上边框                MouseSizeTopLeft = 5, //'拉伸左上角                MouseSizeTopRight = 6, //'拉伸右上角                MouseSizeBottomLeft = 7, //'拉伸左下角                MouseSizeBottomRight = 8, //'拉伸右下角                MouseDrag = 9   // '鼠标拖动            }        const int Band = 5;        const int MinWidth = 10;        const int MinHeight = 10;        private EnumMousePointPosition m_MousePointPosition;        private Point p, p1;        private EnumMousePointPosition MousePointPosition(Size size, System.Windows.Forms.MouseEventArgs e)        {            if ((e.X >= -1 * Band) | (e.X <= size.Width) | (e.Y >= -1 * Band) | (e.Y <= size.Height))            {                if (e.X < Band)                {                    if (e.Y < Band) { return EnumMousePointPosition.MouseSizeTopLeft; }                    else                    {                        if (e.Y > -1 * Band + size.Height)                        { return EnumMousePointPosition.MouseSizeBottomLeft; }                        else                        { return EnumMousePointPosition.MouseSizeLeft; }                    }                }                else                {                    if (e.X > -1 * Band + size.Width)                    {                        if (e.Y < Band)                        { return EnumMousePointPosition.MouseSizeTopRight; }                        else                        {                            if (e.Y > -1 * Band + size.Height)                            { return EnumMousePointPosition.MouseSizeBottomRight; }                            else                            { return EnumMousePointPosition.MouseSizeRight; }                        }                    }                    else                    {                        if (e.Y < Band)                        { return EnumMousePointPosition.MouseSizeTop; }                        else                        {                            if (e.Y > -1 * Band + size.Height)                            { return EnumMousePointPosition.MouseSizeBottom; }                            else                            { return EnumMousePointPosition.MouseDrag; }                        }                    }                }            }            else            { return EnumMousePointPosition.MouseSizeNone; }        }        #endregion        public bool DesignSelected        {            get            {                return designSelected;            }            set            {                designSelected = value;                Invalidate();            }        }        private bool designSelected = false;        public DynamicMapProperty DynamicMapProperty { get; set; }        public StaticMapProperty StaticMapProperty { get; set; }        public string 动态内容 { get; set; }        public RoteDescription RoteDescription { get; set; }        /// 
        /// 被选中，获取到焦点的事件        /// 
        public event Action
     
       SelectedStatusChange;        protected override void OnClick(EventArgs e)        {            DesignSelected = true;            SelectedStatusChange?.Invoke(this, DesignSelected);        }        protected override void OnMouseWheel(MouseEventArgs e)        {            base.OnMouseWheel(e);            double d = 1.068D;            if (e.Delta > 0 && DesignSelected)            {                this.Size = new Size((int)(this.Size.Width * d), (int)(this.Size.Height * d));            }            else            {                this.Size = new Size((int)(this.Size.Width / d), (int)(this.Size.Height / d));            }        }        protected override void OnMouseDown(MouseEventArgs e)        {            p.X = e.X;            p.Y = e.Y;            p1.X = e.X;            p1.Y = e.Y;        }        protected override void OnMouseUp(MouseEventArgs e)        {            m_MousePointPosition = EnumMousePointPosition.MouseSizeNone;            this.Cursor = Cursors.Arrow;        }        protected override void OnMouseMove(MouseEventArgs e)        {            if (e.Button == MouseButtons.Left)            {                switch (m_MousePointPosition)                {                    #region 位置计算                    case EnumMousePointPosition.MouseDrag:                        Left = Left + e.X - p.X;                        Top = Top + e.Y - p.Y;                        break;                    case EnumMousePointPosition.MouseSizeBottom:                        Height = Height + e.Y - p1.Y;                        p1.X = e.X;                        p1.Y = e.Y; //'记录光标拖动的当前点                            break;                    case EnumMousePointPosition.MouseSizeBottomRight:                        Width = Width + e.X - p1.X;                        Height = Height + e.Y - p1.Y;                        p1.X = e.X;                        p1.Y = e.Y; //'记录光标拖动的当前点                            break;                    case EnumMousePointPosition.MouseSizeRight:                        Width = Width + e.X - p1.X;                        Height = Height + e.Y - p1.Y;                        p1.X = e.X;                        p1.Y = e.Y; //'记录光标拖动的当前点                            break;                    case EnumMousePointPosition.MouseSizeTop:                        Top = Top + (e.Y - p.Y);                        Height = Height - (e.Y - p.Y);                        break;                    case EnumMousePointPosition.MouseSizeLeft:                        Left = Left + e.X - p.X;                        Width = Width - (e.X - p.X);                        break;                    case EnumMousePointPosition.MouseSizeBottomLeft:                        Left = Left + e.X - p.X;                        Width = Width - (e.X - p.X);                        Height = Height + e.Y - p1.Y;                        p1.X = e.X;                        p1.Y = e.Y; //'记录光标拖动的当前点                            break;                    case EnumMousePointPosition.MouseSizeTopRight:                        Top = Top + (e.Y - p.Y);                        Width = Width + (e.X - p1.X);                        Height = Height - (e.Y - p.Y);                        p1.X = e.X;                        p1.Y = e.Y; //'记录光标拖动的当前点                            break;                    case EnumMousePointPosition.MouseSizeTopLeft:                        Left = Left + e.X - p.X;                        Top = Top + (e.Y - p.Y);                        Width = Width - (e.X - p.X);                        Height = Height - (e.Y - p.Y);                        break;                    default:                        break;                        #endregion                }                if (Width < MinWidth) Width = MinWidth;                if (Height < MinHeight) Height = MinHeight;                if (Tag != null)                {                                       if (Tag is ImageElementNode)                    {                        var tag = Tag as ImageElementNode;                        tag.Location = Location;                    }                    else if (Tag is BarcodeElementNode)                    {                        var tag = Tag as BarcodeElementNode;                        tag.Location = Location;                    }                    else if (Tag is TextBoxElementNode)                    {                        var tag = Tag as TextBoxElementNode;                        tag.Location = Location;                    }                }            }            else            {                m_MousePointPosition = MousePointPosition(Size, e);                switch (m_MousePointPosition)                {                    #region 改变光标                    case EnumMousePointPosition.MouseSizeNone:                        this.Cursor = Cursors.Arrow;        //'箭头                            break;                    case EnumMousePointPosition.MouseDrag:                        this.Cursor = Cursors.SizeAll;      //'四方向                            break;                    case EnumMousePointPosition.MouseSizeBottom:                        this.Cursor = Cursors.SizeNS;       //'南北                            break;                    case EnumMousePointPosition.MouseSizeTop:                        this.Cursor = Cursors.SizeNS;       //'南北                            break;                    case EnumMousePointPosition.MouseSizeLeft:                        this.Cursor = Cursors.SizeWE;       //'东西                            break;                    case EnumMousePointPosition.MouseSizeRight:                        this.Cursor = Cursors.SizeWE;       //'东西                            break;                    case EnumMousePointPosition.MouseSizeBottomLeft:                        this.Cursor = Cursors.SizeNESW;     //'东北到南西                            break;                    case EnumMousePointPosition.MouseSizeBottomRight:                        this.Cursor = Cursors.SizeNWSE;     //'东南到西北                            break;                    case EnumMousePointPosition.MouseSizeTopLeft:                        this.Cursor = Cursors.SizeNWSE;     //'东南到西北                            break;                    case EnumMousePointPosition.MouseSizeTopRight:                        this.Cursor = Cursors.SizeNESW;     //'东北到南西                            break;                    default:                        break;                        #endregion                }            }        }        /// 
      
        /// 绘制方框        /// 
        /// 
              protected void DrawSelectedStatus(Graphics g)        {            Rectangle rect = ClientRectangle;            rect.Inflate(-6, -6);            using (Pen p = new Pen(Brushes.Black, 1))            {                p.DashStyle = DashStyle.Dot;                p.DashStyle = DashStyle.Solid;                //8个方块                g.FillRectangle(Brushes.White, new Rectangle(rect.Left - 4, rect.Top - 4, 4, 4));                g.FillRectangle(Brushes.White, new Rectangle(rect.Left + rect.Width / 2 - 3, rect.Top - 4, 4, 4));                g.FillRectangle(Brushes.White, new Rectangle(rect.Left + rect.Width, rect.Top - 4, 4, 4));                g.FillRectangle(Brushes.White, new Rectangle(rect.Left - 4, rect.Top + rect.Height / 2 - 3, 4, 4));                g.FillRectangle(Brushes.White, new Rectangle(rect.Left - 4, rect.Top + rect.Height, 4, 4));                g.FillRectangle(Brushes.White, new Rectangle(rect.Left + rect.Width, rect.Top + rect.Height / 2 - 3, 4, 4));                g.FillRectangle(Brushes.White, new Rectangle(rect.Left + rect.Width / 2 - 3, rect.Top + rect.Height, 4, 4));                g.FillRectangle(Brushes.White, new Rectangle(rect.Left + rect.Width, rect.Top + rect.Height, 4, 4));                g.DrawRectangle(p, new Rectangle(rect.Left - 4, rect.Top - 4, 4, 4));                g.DrawRectangle(p, new Rectangle(rect.Left + rect.Width / 2 - 3, rect.Top - 4, 4, 4));                g.DrawRectangle(p, new Rectangle(rect.Left + rect.Width, rect.Top - 4, 4, 4));                g.DrawRectangle(p, new Rectangle(rect.Left - 4, rect.Top + rect.Height / 2 - 3, 4, 4));                g.DrawRectangle(p, new Rectangle(rect.Left - 4, rect.Top + rect.Height, 4, 4));                g.DrawRectangle(p, new Rectangle(rect.Left + rect.Width, rect.Top + rect.Height / 2 - 3, 4, 4));                g.DrawRectangle(p, new Rectangle(rect.Left + rect.Width / 2 - 3, rect.Top + rect.Height, 4, 4));                g.DrawRectangle(p, new Rectangle(rect.Left + rect.Width, rect.Top + rect.Height, 4, 4));            }        }        /// 
      
        /// 旋转图片        /// 
        /// 
      源图        /// 
      角度        /// 
      背景色        /// 
              protected Bitmap ImageRotate(Bitmap bmp, float angle, Color bkColor)        {            int w = bmp.Width + 2;            int h = bmp.Height + 2;            PixelFormat pf;            if (bkColor == Color.Transparent)            {                pf = PixelFormat.Format32bppArgb;            }            else            {                pf = bmp.PixelFormat;            }            Bitmap tmp = new Bitmap(w, h, pf);            Graphics g = Graphics.FromImage(tmp);            g.Clear(bkColor);            g.DrawImageUnscaled(bmp, 1, 1);            g.Dispose();            GraphicsPath path = new GraphicsPath();            path.AddRectangle(new RectangleF(0f, 0f, w, h));            Matrix mtrx = new Matrix();            mtrx.Rotate(angle);            RectangleF rct = path.GetBounds(mtrx);            Bitmap dst = new Bitmap((int)rct.Width, (int)rct.Height, pf);            g = Graphics.FromImage(dst);            g.Clear(bkColor);            g.TranslateTransform(-rct.X, -rct.Y);            g.RotateTransform(angle);            g.InterpolationMode = InterpolationMode.HighQualityBilinear;            g.DrawImageUnscaled(tmp, 0, 0);            g.Dispose();            tmp.Dispose();            return dst;        }        /// 
      
        /// 响应键盘光标键        /// 
        /// 
              public virtual void KeysChangedLocation(Keys keyData)        {            if (keyData == Keys.Up)            {                Top -= 1;            }            if (keyData == Keys.Down)            {                Top += 1;            }            if (keyData == Keys.Left)            {                Left -= 1;            }            if (keyData == Keys.Right)            {                Left += 1;            }            if (Tag != null)            {                if (Tag is ImageElementNode)                {                    var tag = Tag as ImageElementNode;                    tag.Location = Location;                }                else if (Tag is BarcodeElementNode)                {                    var tag = Tag as BarcodeElementNode;                    tag.Location = Location;                }                else if (Tag is TextBoxElementNode)                {                    var tag = Tag as TextBoxElementNode;                    tag.Location = Location;                }            }        }    }}