CSharp: Decorator Pattern

 

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/// <summary>   /// Summary description for Decorator.   /// 装饰  Decorator Patterns   /// 20220918   /// geovindu,Geovin Du,涂聚文   /// </summary>   public interface Decorator   {         /// <summary>       ///       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       void mouseMove(object sender, MouseEventArgs e);       /// <summary>       ///       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       void mouseEnter(object sender, EventArgs e);       /// <summary>       ///       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       void mouseLeave(object sender, EventArgs e);       /// <summary>       ///       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       void paint(object sender, PaintEventArgs e);         }

　　

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/// <summary>    /// 装饰  Decorator Patterns    /// 20220918    /// geovindu,Geovin Du,涂聚文    /// </summary>    public partial class CoolDecorator : Panel, Decorator    {          protected Control contl;        protected Pen bPen, wPen, gPen;        private bool mouse_over;        protected float x1, y1, x2, y2;          /// <summary>        ///        /// </summary>        public CoolDecorator()        {            InitializeComponent();        }        /// <summary>        ///        /// </summary>        /// <param name="container"></param>        public CoolDecorator(IContainer container)        {            container.Add(this);              InitializeComponent();        }        /// <summary>        ///        /// </summary>        /// <param name="c"></param>        /// <param name="baseC"></param>        public CoolDecorator(Control c, Control baseC)        {            //the first control is the one layed out            //the base control is the one whose paint method we extend            //this allows for nesting of decorators            contl = c;            this.Controls.AddRange(new Control[] { contl });            c.Location = new Point(0, 0);            this.Name = "deco" + contl.Name;            this.Size = contl.Size;            x1 = c.Location.X - 1;            y1 = c.Location.Y - 1;            x2 = c.Size.Width;            y2 = c.Size.Height;              //create the overwrite pens            gPen = new Pen(c.BackColor, 2);            bPen = new Pen(Color.Black, 1);            wPen = new Pen(Color.White, 1);              //mouse over, enter handler            EventHandler evh = new EventHandler(mouseEnter);            c.MouseHover += evh;            c.MouseEnter += evh;            c.MouseHover += evh;            //mouse move handler            c.MouseMove += new MouseEventHandler(mouseMove);            c.MouseLeave += new EventHandler(mouseLeave);            //paint handler catches button's paint            baseC.Paint += new PaintEventHandler(paint);          }        /// <summary>        ///        /// </summary>        /// <param name="p"></param>        public void locate(Point p)        {            this.Location = p;            contl.Location = new Point(0, 0);            x1 = p.X;            y1 = p.Y;        }        /// <summary>        ///        /// </summary>        /// <param name="c"></param>        public virtual void locate(Control c)        {            this.Location = c.Location;            c.Location = new Point(0, 0);            x1 = c.Location.X - 1;            y1 = c.Location.Y - 1;            x2 = c.Size.Width;            y2 = c.Size.Height;          }        /// <summary>        ///        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        public void mouseMove(object sender, MouseEventArgs e)        {            mouse_over = true;        }        /// <summary>        ///        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        public void mouseEnter(object sender, EventArgs e)        {            mouse_over = true;            this.Refresh();        }        /// <summary>        ///        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        public void mouseLeave(object sender, EventArgs e)        {            mouse_over = false;            this.Refresh();        }          /// <summary>        ///        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        public virtual void paint(object sender, PaintEventArgs e)        {            //draw over button to change its outline            Graphics g = e.Graphics;            const int d = 1;            //draw over everything in gray first            g.DrawRectangle(gPen, 0, 0, x2 - 1, y2 - 1);            //draw black and white boundaries            //if the mouse is over            if (mouse_over)            {                g.DrawLine(bPen, 0, 0, x2 - d, 0);                g.DrawLine(bPen, 0, 0, 0, y2 - 1);                g.DrawLine(wPen, 0, y2 - d, x2 - d, y2 - d);                g.DrawLine(wPen, x2 - d, 0, x2 - d, y2 - d);            }        }      }

　　

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/// <summary>  /// Summary description for SlashDeco.  /// 装饰  Decorator Patterns  /// 20220918  /// geovindu,Geovin Du,涂聚文  /// </summary>  public class SlashDeco : CoolDecorator  {      private Pen rPen;      /// <summary>      ///      /// </summary>      /// <param name="c"></param>      /// <param name="bc"></param>      public SlashDeco(Control c, Control bc)          : base(c, bc)      {          rPen = new Pen(Color.Red, 2);      }      /// <summary>      ///      /// </summary>      /// <param name="sender"></param>      /// <param name="e"></param>      public override void paint(object sender, PaintEventArgs e)      {          Graphics g = e.Graphics;          x1 = 0; y1 = 0;          x2 = this.Size.Width;          y2 = this.Size.Height;          g.DrawLine(rPen, x1, y1, x2, y2);      }  }

　　

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/// <summary>    /// 装饰  Decorator Patterns    /// 20220918    /// geovindu,Geovin Du,涂聚文    /// </summary>    public partial class DecoPanel : System.Windows.Forms.Panel    {          private Control c;        private Pen bPen, wPen, gPen;        private bool gotControl;        private bool mouse_over;        private float x1, y1, x2, y2;        /// <summary>        ///        /// </summary>        public DecoPanel()        {            InitializeComponent();            init();        }        /// <summary>        ///        /// </summary>        /// <param name="container"></param>        public DecoPanel(IContainer container)        {            container.Add(this);              InitializeComponent();        }          /// <summary>        ///        /// </summary>        private void init()        {            bPen = new Pen(System.Drawing.Color.Black, 1);            wPen = new Pen(System.Drawing.Color.White, 1);//            gotControl = false;      //no control        }        /// <summary>        ///        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        public void ctMouseEnter(object sender, EventArgs e)        {            mouse_over = true;            Refresh();        }        /// <summary>        ///        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        public void ctMouseLeave(object sender, EventArgs e)        {            mouse_over = false;            this.Refresh();        }        /// <summary>        ///        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        public void ctMouseMove(object sender, MouseEventArgs e)        {            mouse_over = true;        }        /// <summary>        ///        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        public void ctPaint(object sender, PaintEventArgs e)        {            //draw over button to change its outline            Graphics g = e.Graphics;            const int d = 1;            //draw over everything in gray first            g.DrawRectangle(gPen, 0, 0, x2 - 1, y2 - 1);            //draw black and white boundaries            //if the mouse is over            if (mouse_over)            {                g.DrawLine(bPen, 0, 0, x2 - d, 0);                g.DrawLine(bPen, 0, 0, 0, y2 - 1);                g.DrawLine(wPen, 0, y2 - d, x2 - d, y2 - d);                g.DrawLine(wPen, x2 - d, 0, x2 - d, y2 - d);            }        }        /// <summary>        ///        /// </summary>        /// <param name="e"></param>        protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)        {            //This is where we find out about the control            if (!gotControl)            {       //once only                //get the control                c = this.Controls[0];                //set the panel size                //1 pixel bigger all around                Size sz = new Size();                sz.Width = c.Size.Width + 2;                sz.Height = c.Size.Height + 2;                this.Size = sz;                  x1 = c.Location.X - 1;                y1 = c.Location.Y - 1;                x2 = c.Size.Width;                y2 = c.Size.Height;                //create the overwrite pen                gPen = new Pen(c.BackColor, 2);                gotControl = true;        //only once                //mouse over, enter handler                EventHandler evh = new EventHandler(ctMouseEnter);                c.MouseHover += evh;                c.MouseEnter += evh;                //mouse move handler                c.MouseMove += new MouseEventHandler(ctMouseMove);                c.MouseLeave += new EventHandler(ctMouseLeave);                //paint handler catches button's paint                c.Paint += new PaintEventHandler(ctPaint);            }        }                }

　　

窗体调用：

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/// <summary>     /// 装饰  Decorator Patterns    /// 20220918    /// geovindu,Geovin Du,涂聚文       /// </summary>    public partial class DecoratorPatternsForm : Form    {          private SlashDeco slash;        /// <summary>        ///        /// </summary>        private CoolDecorator cdec;          /// <summary>        ///        /// </summary>        private void init()        {            //save the position of the button            Point pt = btButtonA.Location;            //create a cool decorator            cdec = new CoolDecorator(btButtonA, btButtonA);            //decorate the cool decorator with a slash            slash = new SlashDeco(cdec, btButtonA);            slash.locate(pt);            //add outside decorator to the layout            //and remove the button from the layout            this.Controls.AddRange(new System.Windows.Forms.Control[] { slash });            this.Controls.Remove(btButtonA);              //this.Controls.AddRange(new System.Windows.Forms.Control[] {cdec});          }        /// <summary>        /// 装饰Decorator Patterns        /// </summary>        public DecoratorPatternsForm()        {            InitializeComponent();            init();        }        /// <summary>        ///        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void DecoratorPatternsForm_Load(object sender, EventArgs e)        {          }        /// <summary>        ///        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void btQuit_Click(object sender, EventArgs e)        {            this.Close();        }        /// <summary>        ///        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void btButtonA_Click(object sender, EventArgs e)        {          }    }

　　

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