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：

 
 


  
  
  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;  

  
  
 

  
  
namespace SQLAnalysis  

  
  
{  

  
  
    public class ListBoxEx : ListBox  

  
  
    {  

  
  
        public ListBoxEx()  

  
  
        {  

  
  
            this.DrawMode = DrawMode.OwnerDrawFixed;  

  
  
            btnList = new List<Button>();  

  
  
        }  

  
  
        public override DrawMode DrawMode  

  
  
        {  

  
  
            get  

  
  
            {  

  
  
                return DrawMode.OwnerDrawFixed;  

  
  
            }  

  
  
            set  

  
  
            {  

  
  
                base.DrawMode = DrawMode.OwnerDrawFixed;  

  
  
            }  

  
  
        }  

  
  
         

  
  
        protected override void OnResize(EventArgs e)  

  
  
        {  

  
  
            base.OnResize(e);  

  
  
            this.Refresh();  

  
  
        }  

  
  
 

  
  
 

  
  
 

  
  
 

  
  
        public Button FindItemButton(int index)  

  
  
        {  

  
  
              

  
  
        // return this.Controls.Find(this.Name + "$ItemComboBox" + index.ToString(), true)[0];  

  
  
            if (index >= btnList.Count)  

  
  
                return null;  

  
  
            return btnList[index];  

  
  
             

  
  
        }  

  
  
 

  
  
        /// <summary> 

  
  
        /// 提供删除item项  

  
  
        /// </summary> 

  
  
        /// <param name="index"></param> 

  
  
        public void RemoveItem(int index)  

  
  
        {  

  
  
            this.Items.RemoveAt(index);  

  
  
            btnList[index].Parent = null;  

  
  
            btnList[index] = null;  

  
  
            //btnList[index].Dispose();  

  
  
              

  
  
            btnList.RemoveAt(index);  

  
  
            this.Refresh();  

  
  
        }  

  
  
        /// <summary> 

  
  
        /// 提供移动item项  

  
  
        /// </summary> 

  
  
        /// <param name="offset"></param> 

  
  
        public void MoveItem(int offset)  

  
  
        {  

  
  
              

  
  
            int index = this.SelectedIndex + offset;  

  
  
            if (index > -1 && index < this.Items.Count)  

  
  
            {  

  
  
                int oldSelectedIndex = this.SelectedIndex;  

  
  
                Object item = this.SelectedItem;  

  
  
                this.Items.RemoveAt(oldSelectedIndex);  

  
  
                this.Items.Insert(index, item);  

  
  
                Button btn = btnList[oldSelectedIndex];  

  
  
                btnList.RemoveAt(oldSelectedIndex);  

  
  
                btnList.Insert(index, btn);  

  
  
 

  
  
                this.Refresh();  

  
  
            }  

  
  
            else  

  
  
            {  

  
  
                MessageBox.Show("不是可用的移动矢量");  

  
  
 

  
  
            }  

  
  
 

  
  
        }  

  
  
 

  
  
        private ToggleItem GetNexttoggleItem(ToggleItem tog)  

  
  
        {  

  
  
            int index = -1;  

  
  
            for (int i = 0; i < ToggleItemList.Count; i++)  

  
  
            {  

  
  
                ToggleItem item =(ToggleItem)ToggleItemList[i];  

  
  
                if (item.Tag == tog.Tag)  

  
  
                {  

  
  
                    iindex = i;  

  
  
                    break;  

  
  
                }  

  
  
            }  

  
  
            return ((ToggleItem)ToggleItemList[(index + 1) % ToggleItemList.Count]);  

  
  
        }  

  
  
        private List<ToggleItem> toggleItemList ;//List<ToggleItem> toggleItemList = new List<ToggleItem>();  

  
  
        [Bindable(false), Browsable(false)]  

  
  
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]     

  
  
        public List<ToggleItem> ToggleItemList  

  
  
        {  

  
  
            get  

  
  
            {  

  
  
                if (toggleItemList == null)  

  
  
                    toggleItemList = new List<ToggleItem>();  

  
  
                return toggleItemList;  

  
  
            }  

  
  
 

  
  
            set  

  
  
            {  

  
  
                if (toggleItemList == null)  

  
  
                    toggleItemList = new List<ToggleItem>();  

  
  
                toggleItemList = value;  

  
  
            }  

  
  
        }  

  
  
 

  
  
        //主要重写事件  

  
  
        protected override void OnDrawItem(DrawItemEventArgs e)  

  
  
        {  

  
  
            this.DrawMode = DrawMode.OwnerDrawFixed;  

  
  
            this.ItemHeight = 22;  

  
  
            e.DrawBackground();  

  
  
            e.DrawFocusRectangle();  

  
  
            Brush myBrush = Brushes.Black;  

  
  
            if (e.Index > -1 && e.Index < this.Items.Count)  

  
  
            {  

  
  
                string drawString = (e.Index + 1)+ " " + this.Items[e.Index].ToString();  

  
  
                  

  
  
 

  
  
                e.Graphics.DrawString(drawString, e.Font, new SolidBrush(e.ForeColor), e.Bounds,   

  
  
 

  
  
StringFormat.GenericDefault);  

  
  
                AddButtonToItem(e);  

  
  
            }  

  
  
            base.OnDrawItem(e);  

  
  
 

  
  
        }  

  
  
 

  
  
        private List<Button> btnList = null;  

  
  
        protected void AddButtonToItem(DrawItemEventArgs e)  

  
  
        {  

  
  
            if (btnList.Count <= e.Index)  

  
  
            {  

  
  
                btnList.Add(new Button());  

  
  
                Button btn = btnList[e.Index];  

  
  
                btn.BackColor = System.Drawing.Color.LightSkyBlue ;  

  
  
                btn.Name = this.Name + "$ItemButton" + e.Index.ToString();  

  
  
                btn.Width = 20;  

  
  
                btn.Height = 20;  

  
  
                btn.ImageAlign = ContentAlignment.MiddleCenter;  

  
  
                btn.TextImageRelation = TextImageRelation.ImageAboveText;  

  
  
                if (toggleItemList.Count > 0)  

  
  
                {  

  
  
                      

  
  
                    btn.BackgroundImage = ((ToggleItem)toggleItemList[0]).BGImage;  

  
  
                    //btn.Width = toggleItemList[0].BGImage.Width;  

  
  
                    //btn.Height = toggleItemList[0].BGImage.Height;  

  
  
                    btn.Tag = ((ToggleItem)toggleItemList[0]).Tag;  

  
  
                }  

  
  
                btn.Parent = this;  

  
  
                btn.Click += new EventHandler(ItemButtonClickHandler);  

  
  
            }  

  
  
            Button bt = btnList[e.Index];  

  
  
            bt.Left = this.Width - bt.Width - 20;  

  
  
            bt.Top = e.Bounds.Top;  

  
  
             

  
  
        }  

  
  
        /// <summary> 

  
  
        /// item button双击事件；  

  
  
        /// </summary> 

  
  
        /// <param name="sender"></param> 

  
  
        /// <param name="e"></param> 

  
  
        protected void ItemButtonClickHandler(object sender, EventArgs e)  

  
  
        {  

  
  
            int index = -1;  

  
  
            if (sender is Button)  

  
  
                index = this.IndexFromPoint(((Button)sender).Location);  

  
  
 

  
  
            if (index == -1)  

  
  
                return;  

  
  
 

  
  
            Button btn = sender as Button;  

  
  
            ToggleItem togold = new ToggleItem((string)btn.Tag, btn.BackgroundImage);  

  
  
            ToggleItem tognew = this.GetNexttoggleItem(togold);  

  
  
            //btn.Width = tognew.BGImage.Width;  

  
  
            //btn.Height = tognew.BGImage.Height;  

  
  
            btn.BackgroundImage = tognew.BGImage;  

  
  
             

  
  
            btn.Tag = tognew.Tag;  

  
  
 

  
  
            ItemEventHandler handler = (ItemEventHandler)Events[ItemLabelClickObj];  

  
  
            if (handler != null)  

  
  
            {     

  
  
                  

  
  
                handler(sender, new ItemButtonClickEventArgs(index)); ;  

  
  
            }  

  
  
        }  

  
  
 

  
  
         

  
  
 

  
  
          

  
  
    }  

  
  
    [Serializable]  

  
  
    public class ToggleItem  

  
  
    {  

  
  
        private string tag;  

  
  
        private Image bgImage;  

  
  
        public ToggleItem()  

  
  
        {  

  
  
        }  

  
  
        public ToggleItem(string tag, Image bg)  

  
  
       {  

  
  
           this.tag = tag;  

  
  
           this.bgImage = bg;  

  
  
       }  

  
  
       public string Tag  

  
  
       {  

  
  
            get  

  
  
            {  

  
  
                return tag;  

  
  
           }  

  
  
           set  

  
  
           {  

  
  
                tag = value;  

  
  
            }  

  
  
        }  

  
  
 

  
  
      public Image BGImage  

  
  
        {  

  
  
           get  

  
  
           {  

  
  
               return bgImage;  

  
  
           }  

  
  
 

  
  
           set  

  
  
           {  

  
  
               bgImage = value;  

  
  
 

  
  
           }  

  
  
       }  

  
  
 

  
  
    }  

  
  
 

  
  
}  

  
  
 

  
  
   
 
 

  本文转自 破狼 51CTO博客，原文链接：http://blog.51cto.com/whitewolfblog/832641，如需转载请自行联系原作者