CSharp: Bridge Pattern

 

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/// <summary>  /// Summary description for VisList.  /// 20220918  /// geovindu,Geovin Du,涂聚文  /// Bridge  Patterns桥接  /// </summary>  public interface VisList  {      //add a line to the display      void addLine(Product p);      //remove a line from the display      void removeLine(int num);  }   /// <summary>  /// Summary description for Bridger.  /// 20220918  /// geovindu,Geovin Du,涂聚文  /// Bridge  Patterns桥接  /// </summary>  //Bridge interface to display list classes  public interface Bridger  {      void addData(ArrayList col);    }

　　

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/// <summary>    /// A simple file handlng class    /// 20220918    /// geovindu,Geovin Du,涂聚文    /// Bridge  Patterns桥接    /// </summary>    public class csFile    {        private string fileName;        StreamReader ts;        StreamWriter ws;        private bool opened, writeOpened;        /// <summary>        ///        /// </summary>        public csFile()        {            init();        }        /// <summary>        ///        /// </summary>        private void init()        {            opened = false;            writeOpened = false;        }        /// <summary>        ///        /// </summary>        /// <param name="file_name"></param>        public csFile(string file_name)        {            fileName = file_name;            init();        }        /// <summary>        ///        /// </summary>        /// <param name="file_name"></param>        /// <returns></returns>        public bool OpenForRead(string file_name)        {            fileName = file_name;            try            {                ts = new StreamReader(fileName);                opened = true;            }            catch (FileNotFoundException)            {                return false;            }            return true;        }        /// <summary>        ///        /// </summary>        /// <returns></returns>        public bool OpenForRead()        {            return OpenForRead(fileName);        }        /// <summary>        ///        /// </summary>        /// <returns></returns>        public string readLine()        {            return ts.ReadLine();        }        /// <summary>        ///        /// </summary>        /// <param name="s"></param>        public void writeLine(string s)        {            ws.WriteLine(s);        }        /// <summary>        ///        /// </summary>        public void close()        {            if (opened)                ts.Close();            if (writeOpened)                ws.Close();        }        /// <summary>        ///        /// </summary>        /// <returns></returns>        public bool OpenForWrite()        {            return OpenForWrite(fileName);        }        /// <summary>        ///        /// </summary>        /// <param name="file_name"></param>        /// <returns></returns>        public bool OpenForWrite(string file_name)        {            try            {                ws = new StreamWriter(file_name);                fileName = file_name;                writeOpened = true;                return true;            }            catch (FileNotFoundException)            {                return false;            }        }    }

　　

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/// <summary>     /// Summary description for Product.     /// 20220918     /// geovindu,Geovin Du,涂聚文     /// Bridge  Patterns桥接     /// </summary>     public class Product : IComparable     {         private string quantity;         private string name;         /// <summary>         ///         /// </summary>         /// <param name="line"></param>         public Product(string line)         {             int i = line.IndexOf("--");             name = line.Substring(0, i).Trim();             quantity = line.Substring(i + 2).Trim();         }         /// <summary>         ///         /// </summary>         /// <returns></returns>         public string getQuantity()         {             return quantity;         }         /// <summary>         ///         /// </summary>         /// <returns></returns>         public string getName()         {             return name;         }         /// <summary>         ///         /// </summary>         /// <param name="p"></param>         /// <returns></returns>         public int CompareTo(object p)         {             Product prod = (Product)p;             return name.CompareTo(prod.getName());         }     }   /// <summary>     /// Summary description for ProductList.     /// 20220918     /// geovindu,Geovin Du,涂聚文     /// Bridge  Patterns桥接     /// </summary>     //A VisList class for the ListBox     public class ProductList : VisList     {         private ListBox list;         /// <summary>         ///         /// </summary>         /// <param name="lst"></param>         public ProductList(ListBox lst)         {             list = lst;         }         /// <summary>         ///         /// </summary>         /// <param name="p"></param>         public void addLine(Product p)         {             list.Items.Add(p.getName());         }         /// <summary>         ///         /// </summary>         /// <param name="num"></param>         public void removeLine(int num)         {             if (num >= 0 && num < list.Items.Count)             {                 list.Items.Remove(num);             }         }     }

　　

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/// <summary>    /// Summary description for SortBridge.    /// 20220918    /// geovindu,Geovin Du,涂聚文    /// Bridge Patterns桥接    /// </summary>    public class SortBridge : ListBridge    {        /// <summary>        ///        /// </summary>        /// <param name="v"></param>        public SortBridge(VisList v)            : base(v)        {        }        /// <summary>        ///        /// </summary>        /// <param name="ar"></param>        public override void addData(ArrayList ar)        {            int max = ar.Count;            Product[] prod = new Product[max];            for (int i = 0; i < max; i++)            {                prod[i] = (Product)ar[i];            }            for (int i = 0; i < max; i++)            {                for (int j = i; j < max; j++)                {                    if (prod[i].CompareTo(prod[j]) > 0)                    {                        Product pt = prod[i];                        prod[i] = prod[j];                        prod[j] = pt;                    }                }            }            for (int i = 0; i < max; i++)            {                vis.addLine(prod[i]);            }        }    }   /// <summary>    /// Summary description for ListBridge.    /// 20220918    /// geovindu,Geovin Du,涂聚文    /// Bridge  Patterns桥接    /// </summary>    public class ListBridge : Bridger    {        protected VisList vis;        /// <summary>        ///        /// </summary>        /// <param name="v"></param>        public ListBridge(VisList v)        {            vis = v;        }        /// <summary>        ///        /// </summary>        /// <param name="ar"></param>        public virtual void addData(ArrayList ar)        {            for (int i = 0; i < ar.Count; i++)            {                Product p = (Product)ar[i];                vis.addLine(p);            }        }    }

　　

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/// <summary>    /// Summary description for GridList.    /// 20220918    /// geovindu,Geovin Du,涂聚文    /// Bridge  Patterns桥接    /// </summary>    public class GridList : VisList    {        private DataGridView grid;        private DataTable dtable;        private GridAdapter gAdapter;        //-----        public GridList(DataGridView grd)        {            grid = grd;            dtable = new DataTable("Products");            DataColumn column = new DataColumn("ProdName");            dtable.Columns.Add(column);            column = new DataColumn("Qty");            dtable.Columns.Add(column);            grid.DataSource = dtable;            gAdapter = new GridAdapter(grid);        }        /// <summary>        ///        /// </summary>        /// <param name="p"></param>        public void addLine(Product p)        {            gAdapter.Add(p);        }        /// <summary>        ///        /// </summary>        /// <param name="num"></param>        public void removeLine(int num)        {          }    }        /// <summary>    /// Summary description for GridAdapter.    /// 20220918    /// geovindu,Geovin Du,涂聚文    /// Bridge  Patterns桥接    /// </summary>    public class GridAdapter    {         // private DataGridView DataGrid        private DataGridView grid;        private DataTable dTable;        private int row;        /// <summary>        ///        /// </summary>        /// <param name="grd"></param>        public GridAdapter(DataGridView grd)        {            grid = grd;            dTable = (DataTable)grid.DataSource;            grid.MouseDown += new System.Windows.Forms.MouseEventHandler(Grid_Click);            row = -1;        }        /// <summary>        ///        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        public void Grid_Click(object sender, System.Windows.Forms.MouseEventArgs e)        {            DataGridView.HitTestInfo hti = grid.HitTest(e.X, e.Y);            if (hti.Type == DataGridViewHitTestType.Cell)    //HitTestType.Cell            {                row = hti.RowIndex;   // hti.Row;            }        }          //private void dataGridView1_MouseDown(object sender, MouseEventArgs e)        //{        //    // If the user right-clicks a cell, store it for use by the shortcut menu.        //    if (e.Button == MouseButtons.Right)        //    {        //        DataGridView.HitTestInfo hit = dataGridView1.HitTest(e.X, e.Y);        //        if (hit.Type == DataGridViewHitTestType.Cell)        //        {        //            clickedCell =        //                dataGridView1.Rows[hit.RowIndex].Cells[hit.ColumnIndex];        //        }        //    }        //}          /// <summary>        ///        /// </summary>        /// <param name="p"></param>        public void Add(Product p)        {            DataRow row = dTable.NewRow();            row[0] = p.getName();            row[1] = p.getQuantity();            dTable.Rows.Add(row);            dTable.AcceptChanges();        }        /// <summary>        ///        /// </summary>        /// <returns></returns>        public int SelectedIndex()        {            return row;        }        /// <summary>        ///        /// </summary>        public void Clear()        {            int count = dTable.Rows.Count;            for (int i = 0; i < count; i++)            {                dTable.Rows[i].Delete();            }        }        /// <summary>        ///        /// </summary>        public void clearSelection() { }    }

　　

窗体调用：

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/// <summary>    /// 20220918    /// geovindu,Geovin Du,涂聚文    /// Bridge  Patterns桥接    /// </summary>    public partial class BridgePatternsForm : Form    {          private ArrayList products;        private VisList prodList, gridList;        /// <summary>        ///        /// </summary>        private void init()        {            products = new ArrayList();            readFile(products); //read in the data file            //create the product list            prodList = new ProductList(lsProd);            //Bridge to product VisList            Bridger lbr = new SortBridge(prodList);            //put the data into the product list            lbr.addData(products);            //create the grid VisList            gridList = new GridList(grdProd);            //Bridge to the grid list            Bridger gbr = new SortBridge(gridList);            //put the data into the grid display            gbr.addData(products);        }        /// <summary>        ///        /// </summary>        /// <param name="products"></param>        private void readFile(ArrayList products)        {            csFile fl = new csFile("products.txt");            fl.OpenForRead();            string s = fl.readLine();            while (s != null)            {                Product p = new Product(s);                products.Add(p);                s = fl.readLine();            }            fl.close();        }        /// <summary>        ///        /// </summary>        public BridgePatternsForm()        {            InitializeComponent();            init();        }        /// <summary>        ///        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void BridgePatternsForm_Load(object sender, EventArgs e)        {          }    }

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