CSharp:Flyweight Patterns

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/// <summary>   /// Summary description for Positioner.   /// Flyweight Patterns享元 模式   ///20220918   /// geovindu,Geovin Du,涂聚文   /// </summary>   public class Positioner   {       private const int pLeft = 30;       private const int pTop = 30;       private const int HSpace = 70;       private const int VSpace = 80;       private const int rowMax = 2;       private int x, y, cnt;       /// <summary>       ///       /// </summary>       public Positioner()       {           reset();       }       /// <summary>       ///       /// </summary>       public void reset()       {           x = pLeft;           y = pTop;           cnt = 0;       }       /// <summary>       ///       /// </summary>       /// <returns></returns>       public int nextX()       {           return x;       }       /// <summary>       ///       /// </summary>       public void incr()       {           cnt++;           if (cnt > rowMax)           {   //reset to start new row               cnt = 0;               x = pLeft;               y += VSpace;           }           else           {               x += HSpace;           }       }       /// <summary>       ///       /// </summary>       /// <returns></returns>       public int nextY()       {           return y;       }   }

　　

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/// <summary>     /// Flyweight Patterns享元 模式     ///20220918     /// geovindu,Geovin Du,涂聚文     /// </summary>     public class Rectangle     {         private int x1, x2, y1, y2;         private int w, h;         public Rectangle() { }         /// <summary>         ///         /// </summary>         /// <param name="x"></param>         /// <param name="y"></param>         public void init(int x, int y)         {             x1 = x;             y1 = y;             x2 = x1 + w;             y2 = y1 + h;         }         /// <summary>         ///         /// </summary>         /// <param name="w_"></param>         /// <param name="h_"></param>         public void setSize(int w_, int h_)         {             w = w_;             h = h_;         }         /// <summary>         ///         /// </summary>         /// <param name="xp"></param>         /// <param name="yp"></param>         /// <returns></returns>         public bool contains(int xp, int yp)         {             return (x1 <= xp) && (xp <= x2) &&                     (y1 <= yp) && (yp <= y2);         }     }

　　

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/// <summary>  /// Summary description for Folder.  /// Flyweight Patterns享元 模式  ///20220918  /// geovindu,Geovin Du,涂聚文  /// </summary>  public class Folder  {      //Draws a folder at the specified coordinates      private const int w = 50;      private const int h = 30;      private Pen blackPen, whitePen;      private Pen grayPen;      private SolidBrush backBrush, blackBrush;      private Font fnt;      /// <summary>      ///      /// </summary>      /// <param name="col"></param>      public Folder(Color col)      {          backBrush = new SolidBrush(col);          blackBrush = new SolidBrush(Color.Black);          blackPen = new Pen(Color.Black);          whitePen = new Pen(Color.White);          grayPen = new Pen(Color.Gray);          fnt = new Font("Arial", 12);      }      /// <summary>      ///      /// </summary>      /// <param name="g"></param>      /// <param name="x"></param>      /// <param name="y"></param>      /// <param name="title"></param>      public void draw(Graphics g, int x, int y, string title)      {          g.FillRectangle(backBrush, x, y, w, h);          g.DrawRectangle(blackPen, x, y, w, h);          g.DrawLine(whitePen, x + 1, y + 1, x + w - 1, y + 1);          g.DrawLine(whitePen, x + 1, y, x + 1, y + h);            g.DrawRectangle(blackPen, x + 5, y - 5, 15, 5);          g.FillRectangle(backBrush, x + 6, y - 4, 13, 6);            g.DrawLine(grayPen, x, y + h - 1, x + w, y + h - 1);          g.DrawLine(grayPen, x + w - 1, y, x + w - 1, y + h - 1);          g.DrawString(title, fnt, blackBrush, x, y + h + 5);      }  }

　　

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/// <summary>     /// Summary description for FolderFactory.     /// Flyweight Patterns享元 模式     ///20220918     /// geovindu,Geovin Du,涂聚文     /// </summary>     public class FolderFactory     {         private Folder selFolder, unselFolder;         /// <summary>         ///         /// </summary>         public FolderFactory()         {             //create the two folders             selFolder = new Folder(Color.Brown);             unselFolder = new Folder(Color.Bisque);         }         /// <summary>         ///         /// </summary>         /// <param name="selected"></param>         /// <returns></returns>         public Folder getFolder(bool selected)         {             if (selected)                 return selFolder;             else                 return unselFolder;         }     }

　　

窗体调用：

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/// <summary>   /// Flyweight Patterns享元 模式   ///20220918   /// geovindu,Geovin Du,涂聚文   /// </summary>   public partial class FlyweightPatternsForm : Form   {       private ArrayList names;       private Folder fol;       private const int pLeft = 30;       private const int pTop = 30;       private const int HSpace = 70;       private const int VSpace = 80;       private const int rowMax = 2;       private string selectedName;       private FlyweightPatterns.Rectangle rect;       private FolderFactory folFact;       private Positioner posn;       /// <summary>       ///       /// </summary>       private void init()       {           names = new ArrayList();           names.Add("Adam");           names.Add("Bill");           names.Add("Charlie");           names.Add("Dave");           names.Add("Edward");           names.Add("Fred");           names.Add("George");           fol = new Folder(Color.Bisque);           selectedName = (string)names[0];           Pic.Paint += new PaintEventHandler(picPaint);           rect = new FlyweightPatterns.Rectangle();           rect.setSize(50, 30);           folFact = new FolderFactory();           posn = new Positioner();       }       /// <summary>       ///       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void picPaint(object sender, PaintEventArgs e)       {           Graphics g = e.Graphics;           posn.reset();           for (int i = 0; i < names.Count; i++)           {               fol = folFact.getFolder(selectedName.Equals((string)names[i]));               fol.draw(g, posn.nextX(), posn.nextY(), (string)names[i]);               posn.incr();           }       }       /// <summary>       ///       /// </summary>       public FlyweightPatternsForm()       {           InitializeComponent();           init();       }       /// <summary>       ///       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void FlyweightPatternsForm_Load(object sender, EventArgs e)       {         }       /// <summary>       ///       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void Pic_Click(object sender, EventArgs e)       {         }       /// <summary>       ///       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void Pic_MouseMove(object sender, MouseEventArgs e)       {           string oldname = selectedName;  //save old name           bool found = false;           posn.reset();           int i = 0;           selectedName = "";           while (i < names.Count && !found)           {               rect.init(posn.nextX(), posn.nextY());               //see if a rectangle contains the mouse               if (rect.contains(e.X, e.Y))               {                   selectedName = (string)names[i];                   found = true;               }               posn.incr();               i++;           }           //only refresh if mouse in new rectangle           if (!oldname.Equals(selectedName))           {               Pic.Refresh();           }       }   }

　　

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