mcs/class/System.Web/System.Web.UI.WebControls/RadioButton.cs

   1 //
   2 // System.Web.UI.WebControls.RadioButton.cs
   3 //
   4 // Authors:
   5 //   Gaurav Vaish (gvaish@iitk.ac.in)
   6 //   Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   7 //
   8 // (C) Gaurav Vaish (2002)
   9 // (C) 2003 Andreas Nahr
  10 //
  11 \r
  12 using System;\r
  13 using System.Collections;\r
  14 using System.Collections.Specialized;\r
  15 using System.Globalization;\r
  16 using System.Web;\r
  17 using System.Web.UI;\r
  18 using System.ComponentModel;
  19 using System.ComponentModel.Design;\r
  20 \r
  21 namespace System.Web.UI.WebControls\r
  22 {\r
  23         [Designer ("System.Web.UI.Design.WebControls.CheckBoxDesigner, " + Consts.AssemblySystem_Design, typeof (IDesigner))]\r
  24         public class RadioButton : CheckBox, IPostBackDataHandler\r
  25         {\r
  26                 public RadioButton () : base ()\r
  27                 {\r
  28                 }
  29 \r
  30                 [DefaultValue (""), WebCategory ("Behavior")]
  31                 [WebSysDescription ("The name of the group that this control belongs to.")]\r
  32                 public virtual string GroupName\r
  33                 {\r
  34                         get {\r
  35                                 object o = ViewState ["GroupName"];\r
  36                                 return (o == null) ? String.Empty : (string) o;\r
  37                         }\r
  38 \r
  39                         set { ViewState ["GroupName"] = value; }\r
  40                 }\r
  41 \r
  42                 protected override void OnPreRender (EventArgs e)\r
  43                 {\r
  44                         base.OnPreRender (e);\r
  45                         if (Page != null && Enabled && !Checked)\r
  46                                 Page.RegisterRequiresPostBack (this);\r
  47 \r
  48                         if(GroupName.Length == 0)\r
  49                                 GroupName = UniqueID;\r
  50                 }\r
  51 \r
  52                 internal override void RenderInputTag (HtmlTextWriter writer, string id)\r
  53                 {\r
  54                         writer.AddAttribute (HtmlTextWriterAttribute.Id, id);\r
  55                         writer.AddAttribute (HtmlTextWriterAttribute.Type, "radio");\r
  56                         writer.AddAttribute (HtmlTextWriterAttribute.Name, UniqueGroupNamePrivate);\r
  57                         writer.AddAttribute (HtmlTextWriterAttribute.Value, ValueAttributePrivate);\r
  58 \r
  59                         if (Checked)\r
  60                                 writer.AddAttribute (HtmlTextWriterAttribute.Checked, "checked");
  61                         \r
  62                         if (!Enabled)
  63                                 writer.AddAttribute (HtmlTextWriterAttribute.Disabled, "disabled");
  64 \r
  65                         if (AutoPostBack){\r
  66                                 writer.AddAttribute (HtmlTextWriterAttribute.Onclick,\r
  67                                                      Page.GetPostBackClientEvent (this, ""));\r
  68                                 writer.AddAttribute ("language", "javascript");\r
  69                         }\r
  70 \r
  71                         if (AccessKey.Length > 0)\r
  72                                 writer.AddAttribute (HtmlTextWriterAttribute.Accesskey, AccessKey);\r
  73 \r
  74                         if (TabIndex != 0)
  75                                 writer.AddAttribute (HtmlTextWriterAttribute.Tabindex,\r
  76                                                      TabIndex.ToString (NumberFormatInfo.InvariantInfo));\r
  77 \r
  78                         writer.RenderBeginTag (System.Web.UI.HtmlTextWriterTag.Input);\r
  79                         writer.RenderEndTag ();\r
  80                 }\r
  81 \r
  82                 private string UniqueGroupNamePrivate\r
  83                 {\r
  84                         get {\r
  85                                 string retVal = GroupName;\r
  86                                 int unique = UniqueID.LastIndexOf (':');\r
  87                                 if (unique >= 0)\r
  88                                         retVal += UniqueID.Substring (unique + 1);\r
  89 \r
  90                                 return retVal;\r
  91                         }\r
  92                 }\r
  93 \r
  94                 private string ValueAttributePrivate\r
  95                 {\r
  96                         get {\r
  97                                 string retVal = Attributes ["value"];\r
  98                                 if (retVal != null)\r
  99                                         return retVal;\r
 100 \r
 101                                 if (ID != null)\r
 102                                         return ID;\r
 103 \r
 104                                 return UniqueID;\r
 105                         }\r
 106                 }\r
 107 \r
 108                 bool IPostBackDataHandler.LoadPostData (string postDataKey,\r
 109                                                         NameValueCollection postCollection)\r
 110                 {\r
 111                         bool _checked = Checked;\r
 112                         if (postCollection [UniqueGroupNamePrivate] == ValueAttributePrivate){\r
 113                                 if (_checked)\r
 114                                         return false;\r
 115                                 Checked = true;\r
 116                                 return true;\r
 117                         }\r
 118 \r
 119                         if (_checked)\r
 120                                 Checked = false;\r
 121                         return true;\r
 122                 }\r
 123 \r
 124                 void IPostBackDataHandler.RaisePostDataChangedEvent ()\r
 125                 {\r
 126                         OnCheckedChanged (EventArgs.Empty);\r
 127                 }\r
 128         }\r
 129 }\r