C# SuperCombox组件

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  1using System;
  2using System.Collections;
  3using System.ComponentModel;
  4using System.Drawing;
  5using System.Data;
  6using System.Windows.Forms;
  7
  8namespace NetBee.Infrastructure
  9{
 10    /**//// <summary>
 11    /// SuperComboBox 的摘要说明。
 12    /// </summary>
 13    public class SuperComboBox : System.Windows.Forms.ComboBox
 14    {
 15        /**//// <summary> 
 16        /// 必需的设计器变量。
 17        /// </summary>
 18        private System.ComponentModel.Container components = null;
 19
 20        private ArrayList _items=new ArrayList();
 21        private string cache;
 22
 23        public SuperComboBox()
 24        {
 25            // 该调用是 Windows.Forms 窗体设计器所必需的。
 26            InitializeComponent();
 27
 28            // TODO: 在 InitializeComponent 调用后添加任何初始化
 29        }
 30
 31        public void AddItemIn()
 32        {
 33            if(this._items.Count>0)
 34            {
 35                if(!this._items.Contains(this.Text) && this.Text!="")
 36                {
 37                    this._items.Add(this.Text);
 38                }
 39            }
 40            else
 41            {
 42                if(this.Text!="")
 43                {
 44                    this._items.Add(this.Text);
 45                }
 46            }
 47        }
 48
 49        public int GetItemsCount()
 50        {
 51            return this._items.Count;
 52        }
 53
 54        /**//// <summary> 
 55        /// 清理所有正在使用的资源。
 56        /// </summary>
 57        protected override void Dispose( bool disposing )
 58        {
 59            if( disposing )
 60            {
 61                if(components != null)
 62                {
 63                    components.Dispose();
 64                }
 65            }
 66            base.Dispose( disposing );
 67        }
 68
 69        组件设计器生成的代码#region 组件设计器生成的代码
 70        /**//// <summary> 
 71        /// 设计器支持所需的方法 - 不要使用代码编辑器 
 72        /// 修改此方法的内容。
 73        /// </summary>
 74        private void InitializeComponent()
 75        {
 76            // 
 77            // SuperComboBox
 78            // 
 79            this.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.SuperComboBox_KeyPress);
 80            this.TextChanged += new System.EventHandler(this.SuperComboBox_TextChanged);
 81
 82        }
 83        #endregion
 84
 85        private void SuperComboBox_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
 86        {
 87            if(e.KeyChar=='\r')
 88            {
 89                this.DroppedDown=false;
 90                this.Text=this.cache;
 91                //this.DoSearch();
 92            }
 93
 94            if(char.IsControl(e.KeyChar))
 95            {
 96                if(e.KeyChar=='\b')
 97                {
 98                    this.DroppedDown=false;
 99                    this.Text=this.cache;
100                }
101            }
102        }
103
104        public void ShowList()
105        {
106            this.DroppedDown=true;
107        }
108
109        public void HideList()
110        {
111            this.DroppedDown=false;
112        }
113
114        public ArrayList GetFilteredList()
115        {
116            this.Items.Clear();
117
118            ArrayList newArrayList=new ArrayList();
119            newArrayList.Clear();
120            foreach(string str in this._items)
121            {
122                if(str.Length>0)
123                {
124                    if(str.IndexOf(this.Text)==0 && (!str.Equals(this.Text)))
125                    {
126                        newArrayList.Add(str);
127                    }
128                }
129            }
130            return newArrayList;
131        }
132        
133
134        private void SuperComboBox_TextChanged(object sender, System.EventArgs e)
135        {
136            this.cache=this.Text;
137            if(this.Text!="")
138            {
139                object[] al=this.GetFilteredList().ToArray();
140                if(al.Length>0)
141                {
142                    this.AddItemsCore(al);
143                    this.ShowList();
144                    if(this.cache!="")this.Text=this.cache;
145                    this.SelectionStart=this.Text.Length+1;
146                }
147                else
148                {
149                    if(this.DroppedDown==true)
150                    {
151                        this.HideList();
152                        this.Focus();
153                        this.SelectionStart=this.cache.Length;
154                    }
155                    else
156                    {
157                        this.SelectionStart=this.Text.Length+1;
158                    }
159                }                    
160            }
161            
162        }
163    }
164}
165