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;
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;
}
}
}
}