自定义控件---重写Listbox实现item图标变换和item点击事件

      博客开通有一阵了，就是没有时间写，遗憾啊。！
      这几天做了个排序的自定义控件，在listbox item里放是button 并支持图标的交替变换
效果如下：


把代码贴上：

  1using System;
  2using System.Collections.Generic;
  3using System.Collections;
  4using System.Text;
  5using System.ComponentModel;
  6using System.Windows.Forms;
  7using System.Drawing;
  8using System.Drawing.Text;
  9using System.Data;
 10
 11namespace SQLAnalysis
 12{
 13    public class ListBoxEx : ListBox
 14    {
 15        public ListBoxEx()
 16        {
 17            this.DrawMode = DrawMode.OwnerDrawFixed;
 18            btnList = new List<Button>();
 19        }
 20        public override DrawMode DrawMode
 21        {
 22            get
 23            {
 24                return DrawMode.OwnerDrawFixed;
 25            }
 26            set
 27            {
 28                base.DrawMode = DrawMode.OwnerDrawFixed;
 29            }
 30        }
 31       
 32        protected override void OnResize(EventArgs e)
 33        {
 34            base.OnResize(e);
 35            this.Refresh();
 36        }
 37
 38
 39
 40
 41        public Button FindItemButton(int index)
 42        {
 43            
 44        // return this.Controls.Find(this.Name + "$ItemComboBox" + index.ToString(), true)[0];
 45            if (index >= btnList.Count)
 46                return null;
 47            return btnList[index];
 48           
 49        }
 50
 51        /**//// <summary>
 52        /// 提供删除item项
 53        /// </summary>
 54        /// <param name="index"></param>
 55        public void RemoveItem(int index)
 56        {
 57            this.Items.RemoveAt(index);
 58            btnList[index].Parent = null;
 59            btnList[index] = null;
 60            //btnList[index].Dispose();
 61            
 62            btnList.RemoveAt(index);
 63            this.Refresh();
 64        }
 65        /**//// <summary>
 66        /// 提供移动item项
 67        /// </summary>
 68        /// <param name="offset"></param>
 69        public void MoveItem(int offset)
 70        {
 71            
 72            int index = this.SelectedIndex + offset;
 73            if (index > -1 && index < this.Items.Count)
 74            {
 75                int oldSelectedIndex = this.SelectedIndex;
 76                Object item = this.SelectedItem;
 77                this.Items.RemoveAt(oldSelectedIndex);
 78                this.Items.Insert(index, item);
 79                Button btn = btnList[oldSelectedIndex];
 80                btnList.RemoveAt(oldSelectedIndex);
 81                btnList.Insert(index, btn);
 82
 83                this.Refresh();
 84            }
 85            else
 86            {
 87                MessageBox.Show("不是可用的移动矢量");
 88
 89            }
 90
 91        }
 92
 93        private ToggleItem GetNexttoggleItem(ToggleItem tog)
 94        {
 95            int index = -1;
 96            for (int i = 0; i < ToggleItemList.Count; i++)
 97            {
 98                ToggleItem item =(ToggleItem)ToggleItemList[i];
 99                if (item.Tag == tog.Tag)
100                {
101                    index = i;
102                    break;
103                }
104            }
105            return ((ToggleItem)ToggleItemList[(index + 1) % ToggleItemList.Count]);
106        }
107        private List<ToggleItem> toggleItemList ;//List<ToggleItem> toggleItemList = new List<ToggleItem>();
108        [Bindable(false), Browsable(false)]
109        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]   
110        public List<ToggleItem> ToggleItemList
111        {
112            get
113            {
114                if (toggleItemList == null)
115                    toggleItemList = new List<ToggleItem>();
116                return toggleItemList;
117            }
118
119            set
120            {
121                if (toggleItemList == null)
122                    toggleItemList = new List<ToggleItem>();
123                toggleItemList = value;
124            }
125        }
126
127        //主要重写事件
128        protected override void OnDrawItem(DrawItemEventArgs e)
129        {
130            this.DrawMode = DrawMode.OwnerDrawFixed;
131            this.ItemHeight = 22;
132            e.DrawBackground();
133            e.DrawFocusRectangle();
134            Brush myBrush = Brushes.Black;
135            if (e.Index > -1 && e.Index < this.Items.Count)
136            {
137                string drawString = (e.Index + 1)+ " " + this.Items[e.Index].ToString();
138                
139
140                e.Graphics.DrawString(drawString, e.Font, new SolidBrush(e.ForeColor), e.Bounds, 
141
142StringFormat.GenericDefault);
143                AddButtonToItem(e);
144            }
145            base.OnDrawItem(e);
146
147        }
148
149        private List<Button> btnList = null;
150        protected void AddButtonToItem(DrawItemEventArgs e)
151        {
152            if (btnList.Count <= e.Index)
153            {
154                btnList.Add(new Button());
155                Button btn = btnList[e.Index];
156                btn.BackColor = System.Drawing.Color.LightSkyBlue ;
157                btn.Name = this.Name + "$ItemButton" + e.Index.ToString();
158                btn.Width = 20;
159                btn.Height = 20;
160                btn.ImageAlign = ContentAlignment.MiddleCenter;
161                btn.TextImageRelation = TextImageRelation.ImageAboveText;
162                if (toggleItemList.Count > 0)
163                {
164                    
165                    btn.BackgroundImage = ((ToggleItem)toggleItemList[0]).BGImage;
166                    //btn.Width = toggleItemList[0].BGImage.Width;
167                    //btn.Height = toggleItemList[0].BGImage.Height;
168                    btn.Tag = ((ToggleItem)toggleItemList[0]).Tag;
169                }
170                btn.Parent = this;
171                btn.Click += new EventHandler(ItemButtonClickHandler);
172            }
173            Button bt = btnList[e.Index];
174            bt.Left = this.Width - bt.Width - 20;
175            bt.Top = e.Bounds.Top;
176           
177        }
178        /**//// <summary>
179        /// item button双击事件；
180        /// </summary>
181        /// <param name="sender"></param>
182        /// <param name="e"></param>
183        protected void ItemButtonClickHandler(object sender, EventArgs e)
184        {
185            int index = -1;
186            if (sender is Button)
187                index = this.IndexFromPoint(((Button)sender).Location);
188
189            if (index == -1)
190                return;
191
192            Button btn = sender as Button;
193            ToggleItem togold = new ToggleItem((string)btn.Tag, btn.BackgroundImage);
194            ToggleItem tognew = this.GetNexttoggleItem(togold);
195            //btn.Width = tognew.BGImage.Width;
196            //btn.Height = tognew.BGImage.Height;
197            btn.BackgroundImage = tognew.BGImage;
198           
199            btn.Tag = tognew.Tag;
200
201            ItemEventHandler handler = (ItemEventHandler)Events[ItemLabelClickObj];
202            if (handler != null)
203            {   
204                
205                handler(sender, new ItemButtonClickEventArgs(index)); ;
206            }
207        }
208
209       
210
211        #region 
212        private static readonly object ItemLabelClickObj = new object();
213        public delegate void ItemEventHandler(object sender, ItemButtonClickEventArgs e);
214        public class ItemButtonClickEventArgs : EventArgs
215        {
216            private int index;
217            public ItemButtonClickEventArgs(int index)
218                : base()
219            {
220                this.index = index;
221            }
222            public int Index
223            {
224                get
225                {
226                    return index;
227                }
228            }
229        }
230
231        public event ItemEventHandler ItemLabelClick
232        {
233            add
234            {
235                Events.AddHandler(ItemLabelClickObj, value);
236            }
237            remove
238            {
239                Events.RemoveHandler(ItemLabelClickObj, value);
240            }
241        }
242        #endregion
243    }
244    [Serializable]
245    public class ToggleItem
246    {
247        private string tag;
248        private Image bgImage;
249        public ToggleItem()
250        {
251        }
252        public ToggleItem(string tag, Image bg)
253       {
254           this.tag = tag;
255           this.bgImage = bg;
256       }
257       public string Tag
258       {
259            get
260            {
261                return tag;
262           }
263           set
264           {
265                tag = value;
266            }
267        }
268
269      public Image BGImage
270        {
271           get
272           {
273               return bgImage;
274           }
275
276           set
277           {
278               bgImage = value;
279
280           }
281       }
282
283    }
284
285}