如何为标准的ListBox添加ItemClick事件
今天在项目中遇到了一个小问题,需要给ListBox添加ItemClick事件,很简单:
public class MyListBox:ListBox
{
private static readonly object EventItemClick = new object();
public event EventHandler<ListBoxItemEventArgs> ItemClick
{
add
{
Events.AddHandler(EventItemClick, value);
}
remove
{
Events.RemoveHandler(EventItemClick, value);
}
}
protected virtual void OnItemClick(ListBoxItemEventArgs e)
{
EventHandler<ListBoxItemEventArgs> handler = (EventHandler<ListBoxItemEventArgs>)this.Events[EventItemClick];
if (handler != null)
{
handler(this, e);
}
}
protected override void OnClick(EventArgs e)
{
base.OnClick(e);
for (int i = 0; i < this.Items.Count; i++)
{
bool flag = this.GetItemRectangle(i).Contains(this.PointToClient(Control.MousePosition));
if (flag)
{
ListBoxItemEventArgs args = new ListBoxItemEventArgs(i);
OnItemClick(args);
break;
}
}
}
}
public class ListBoxItemEventArgs : EventArgs
{
private int _listBoxItem;
public ListBoxItemEventArgs(int listBoxItem)
{
_listBoxItem = listBoxItem;
}
public int ListBoxItem
{
get
{
return _listBoxItem;
}
}
}