CSharp: Decorator Pattern

 

  /// <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);



    }

　　

 /// <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);
            }
        }

    }

　　

   /// <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);
        }
    }

　　

 /// <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：

 /// <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)
        {

        }
    }

　　

输出：

点击前：、

 

点击后：