using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Globalization;


namespace HuizhongLibrary.Control
{

	[DefaultProperty("Value"),
	ToolboxData("<{0}:DataGridRadioButton runat=server></{0}:DataGridRadioButton>"),ParseChildren(true),
	PersistChildren(false)]
	public class DataGridRadioButton : RadioButton,INamingContainer,IPostBackDataHandler
	{
		public DataGridRadioButton() : base()
        {
			this.PreRender +=new EventHandler(DataGridRadioButton_PreRender);
        }

		private void DataGridRadioButton_PreRender(object sender, EventArgs e)
		{
//			Page.RegisterHiddenField("RadioButton_Checked", this.Checked.ToString());
//			Page.RegisterStartupScript("jsSetRadioButton_Checked", "<script type=\"text/javascript\">document.getElementById("+this.ClientID+").Checked=" + this.Checked.ToString() + ";</script>");
//			this.Attributes.Add("onclick","document.getElementById('RadioButton_Checked').value = this.Checked;");
			// 将控件注册为要求在页回发至服务器时进行回发处理的控件
			if (Page != null) Page.RegisterRequiresPostBack(this);
		}
  
          #region Properties
  
          private string Value
          {
              get
            {
                 string val = Attributes["value"];
                  if(val == null)
                      val = UniqueID;
                  else
                      val = UniqueID + "_" + val;
                  return val;
              }
          }
  
          #endregion
          
          #region Rendering
  
          protected override void Render(HtmlTextWriter output)
          {
              RenderInputTag(output);

          }
  
          private void RenderInputTag(HtmlTextWriter htw)
          {
              htw.AddAttribute(HtmlTextWriterAttribute.Id, ClientID);
              htw.AddAttribute(HtmlTextWriterAttribute.Type, "radio");
              htw.AddAttribute(HtmlTextWriterAttribute.Name, GroupName);
              htw.AddAttribute(HtmlTextWriterAttribute.Value, Value);
              if(Checked)
                  htw.AddAttribute(HtmlTextWriterAttribute.Checked, "checked");
              if(!Enabled)
                  htw.AddAttribute(HtmlTextWriterAttribute.Disabled, "disabled");
              
              string onClick = Attributes["onclick"];
              if(AutoPostBack)
              {
                  if(onClick != null)
                      onClick = String.Empty;
                  onClick += Page.GetPostBackClientEvent(this, String.Empty);
                  htw.AddAttribute(HtmlTextWriterAttribute.Onclick, onClick);
                  htw.AddAttribute("language", "javascript");
              }
              else
              {
                  if(onClick != null)
                      htw.AddAttribute(HtmlTextWriterAttribute.Onclick, onClick);
              }
  
              if(AccessKey.Length > 0)
                  htw.AddAttribute(HtmlTextWriterAttribute.Accesskey, AccessKey);
              if(TabIndex != 0)
                  htw.AddAttribute(HtmlTextWriterAttribute.Tabindex, 
                      TabIndex.ToString(NumberFormatInfo.InvariantInfo));
              htw.RenderBeginTag(HtmlTextWriterTag.Input);
              htw.RenderEndTag();
          }
  
          #endregion
  
          #region IPostBackDataHandler Members
  
          void IPostBackDataHandler.RaisePostDataChangedEvent()
          {
              OnCheckedChanged(EventArgs.Empty);
          }
  
          bool IPostBackDataHandler.LoadPostData(string postDataKey, System.Collections.Specialized.NameValueCollection postCollection)
          {
              bool result = false;
              string value = postCollection[GroupName];
              if((value != null) && (value == Value))
              {
                  if(!Checked)
                  {
                      Checked = true;
                      result = true;
                  }
              }
              else
              {
                  if(Checked)
                      Checked = false;
             }
//			if (postCollection["RadioButton_Checked"]!=null)this.Checked=Convert.ToBoolean(postCollection["RadioButton_Checked"]);
            return result;
         }
 
		#endregion

	
	}
 }