BWPB3
/
B3ButcherManageClient


								using System;

								using System.Collections;

								using System.Collections.Generic;

								using System.Drawing;

								using System.Linq;

								using System.Runtime.InteropServices;

								using System.Text;

								using System.Threading.Tasks;

								using System.Windows.Forms;


								namespace BWP.WinFormControl

								{

								  public class UComboBox : ComboBox

								  {

								    ToolTip itemTip = null;

								    public UComboBox()

								    {

								      this.DropDown += (sender, de) =>

								      {

								        CRefreshItems();

								        //if (string.IsNullOrEmpty(this.Text))

								        //  return;


								        //if (_enableTopItem && Items.Count > 1)

								        //  this.SelectedIndex = 1;

								        //else if (!_enableTopItem && Items.Count > 0)

								        //  this.SelectedIndex = 0;

								        SelectionStart = Text.Length;

								      };

								      this.SelectedIndexChanged += (sender, e) =>

								      {

								        var item = SelectedItem as WordPair;

								        if (item.DisplayName == string.Empty)

								          _selectedObj = null;

								        else

								          _selectedObj = item;

								      };


								      this.DrawMode = DrawMode.OwnerDrawFixed;

								      this.DrawItem += new DrawItemEventHandler(cb_DrawItem);

								      this.DropDownClosed += new EventHandler(cb_DropDownClosed);

								      itemTip = new ToolTip();

								      itemTip.SetToolTip(this, "");

								    }


								    void cb_DrawItem(object sender, System.Windows.Forms.DrawItemEventArgs e)

								    {

								      // 绘制背景

								      e.DrawBackground();

								      //绘制列表项目

								      e.Graphics.DrawString(this.Items[e.Index].ToString(), e.Font, System.Drawing.Brushes.Black, e.Bounds);

								      //将高亮的列表项目的文字传递到toolTip1(之前建立ToolTip的一个实例)

								      if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)

								        itemTip.Show(this.Items[e.Index].ToString(), this, e.Bounds.X + e.Bounds.Width, e.Bounds.Y + e.Bounds.Height);

								      e.DrawFocusRectangle();

								    }

								    void cb_DropDownClosed(object sender, EventArgs e)

								    {

								      itemTip.Hide(this);

								    }


								    public string DefaultServerPath = "/MainSystem/B3ClientService/Rpcs/";

								    public string CodeArgs { get; set; }


								    private bool _enableTopItem = true;

								    public bool EnableTopItem

								    {

								      get { return _enableTopItem; }

								      set { _enableTopItem = value; }

								    }


								    private int range = 10;

								    public int Range

								    {

								      get { return range; }

								      set { range = value; }

								    }


								    private string rpcPath;

								    public void Init(string _rpcPath)

								    {

								      rpcPath = _rpcPath;

								      if (string.IsNullOrEmpty(rpcPath))

								        return;

								      rpcPath = string.Format("{0}{1}", DefaultServerPath, rpcPath);

								    }


								    protected override void OnKeyUp(KeyEventArgs e)

								    {

								      base.OnKeyUp(e);

								      if (e.KeyCode == System.Windows.Forms.Keys.Enter)

								      {

								        this.FindForm().Cursor = Cursors.Default;

								        if (string.IsNullOrEmpty(this.Text) || this.DisplayValue != this.Text || string.IsNullOrEmpty(this.SelectedText))

								        {

								          if (!this.DroppedDown)

								            this.DroppedDown = true;

								        }

								      }

								    }


								    void CRefreshItems()

								    {

								      var inputArgs = string.Empty;

								      if (this.SelectedItem == null)

								        inputArgs = this.Text;

								      var list = ComboBoxHelper.GetList(rpcPath, inputArgs, CodeArgs, Range);

								      if (_enableTopItem)

								        list.Insert(0, new WordPair(string.Empty));

								      this.Items.Clear();

								      foreach (var item in list)

								        this.Items.Add(item);

								      this.DisplayMember = "DisplayName";

								      this.ValueMember = "PhyName";

								    }


								    public void Clear()

								    {

								      _selectedObj = null;

								      this.Text = string.Empty;

								    }


								    public void Fill(string display, string value)

								    {

								      if (string.IsNullOrEmpty(display))

								      {

								        Clear();

								        return;

								      }

								      _selectedObj = new WordPair(display, value);

								      this.Text = display == null ? string.Empty : display;

								    }


								    public bool IsEmpty { get { return _selectedObj == null; } }


								    public string DisplayValue { get { if (IsEmpty) return null; return _selectedObj.DisplayName; } }


								    public string Value { get { if (IsEmpty) return null; return _selectedObj.PhyName; } }


								    public long? LongValue

								    {

								      get

								      {

								        if (IsEmpty)

								          return null;

								        long v;

								        if (long.TryParse(_selectedObj.PhyName, out v))

								          return v;

								        return null;

								      }

								    }


								    private WordPair _selectedObj = null;


								    protected override void OnDropDown(EventArgs e)

								    {

								      base.OnDropDown(e);

								      AdjustComboBoxDropDownListWidth();  //调整comboBox的下拉列表的大小

								    }


								    private void AdjustComboBoxDropDownListWidth()

								    {

								      Graphics g = null;

								      Font font = null;

								      try

								      {

								        int width = this.Width;

								        g = this.CreateGraphics();

								        font = this.Font;


								        //checks if a scrollbar will be displayed.

								        //If yes, then get its width to adjust the size of the drop down list.

								        int vertScrollBarWidth =

								            (this.Items.Count > this.MaxDropDownItems)

								            ? SystemInformation.VerticalScrollBarWidth : 0;


								        int newWidth;

								        foreach (object s in this.Items)  //Loop through list items and check size of each items.

								        {

								          if (s != null)

								          {

								            newWidth = (int)g.MeasureString(s.ToString().Trim(), font).Width

								                + vertScrollBarWidth;

								            if (width < newWidth)

								              width = newWidth;   //set the width of the drop down list to the width of the largest item.

								          }

								        }

								        this.DropDownWidth = width;

								      }

								      catch

								      { }

								      finally

								      {

								        if (g != null)

								          g.Dispose();

								      }

								    }

								  }

								}