mcs/class/System.Web/System.Web.UI.HtmlControls/HtmlInputRadioButton.cs

   1 /*      System.Web.UI.HtmlControls
   2 *       Authors
   3 *               Leen Toelen (toelen@hotmail.com)
   4 */
   5
   6 using System;
   7 using System.Collections.Specialized;
   8 using System.ComponentModel;
   9 using System.Globalization;
  10 using System.Web;
  11 using System.Web.UI;
  12
  13 namespace System.Web.UI.HtmlControls{
  14
  15         [DefaultEvent("ServerChange")]
  16         public class HtmlInputRadioButton : HtmlInputControl, IPostBackDataHandler{
  17
  18                 private static readonly object EventServerChange = new object ();
  19
  20                 public HtmlInputRadioButton(): base("radio"){}
  21
  22                 protected override void OnPreRender(EventArgs e){
  23                         if (Page != null && !Disabled){
  24                                 Page.RegisterRequiresPostBack(this);
  25                         }
  26                         if (Events[EventServerChange] != null && !Disabled){
  27                                 ViewState.SetItemDirty("checked", false);
  28                         }
  29                 }
  30
  31                 protected virtual void OnServerChange(EventArgs e){
  32                         EventHandler handler = (EventHandler) Events[EventServerChange];
  33                         if (handler != null){
  34                                 handler (this, e);
  35                         }
  36                 }
  37
  38                 protected override void RenderAttributes(HtmlTextWriter writer){
  39                         writer.WriteAttribute("value", Value);
  40                         Attributes.Remove("value");
  41                         base.RenderAttributes(writer);
  42                 }
  43
  44                 bool IPostBackDataHandler.LoadPostData (string postDataKey,
  45                                                         NameValueCollection postCollection)
  46                 {
  47                         string postValue = postCollection [Name];
  48                         bool myBool = false;
  49                         if (postValue != null && postValue.Equals (Value)) {
  50                                 if (!Checked) {
  51                                         Checked = true;
  52                                         myBool = true;
  53                                 }
  54                         } else {
  55                                 if (Checked) {
  56                                         Checked = false;
  57                                         myBool = false;
  58                                 }
  59                         }
  60                         return myBool;
  61                 }
  62
  63                 void IPostBackDataHandler.RaisePostDataChangedEvent ()
  64                 {
  65                         OnServerChange (EventArgs.Empty);
  66                 }
  67
  68                 [WebCategory("Action")]
  69                 [WebSysDescription("Fires when the checked state of the control changes.")]
  70                 public event EventHandler ServerChange{
  71                         add{
  72                                 Events.AddHandler(EventServerChange, value);
  73                         }
  74                         remove{
  75                                 Events.RemoveHandler(EventServerChange, value);
  76                         }
  77                 }
  78
  79                 [DefaultValue("")]
  80                 [WebCategory("Misc")]
  81                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
  82                 public bool Checked{
  83                         get{
  84                                 string attr = Attributes["checked"];
  85                                 if (attr != null){
  86                                         return attr.Equals("checked");
  87                                 }
  88                                 return false;
  89                         }
  90                         set{
  91                                 if (value)
  92                                         Attributes["checked"] = "checked";
  93                                 else
  94                                         Attributes.Remove ("checked");
  95                         }
  96                 }
  97                 public override string Name
  98                 {
  99                         get {
 100                                 string attr = Attributes ["name"]; // Gotta use "name" to group radio buttons
 101                                 return (attr == null) ? String.Empty : attr;
 102                         }
 103                         set { Attributes ["name"] = value; }
 104                 }
 105
 106                 internal override string RenderedName{
 107                         get{
 108                                 string attr = base.RenderedName;
 109                                 string id = UniqueID;
 110                                 int indexOfX = id.LastIndexOf('X');
 111                                 if (indexOfX != 0 && indexOfX >= 0){
 112                                         attr = String.Concat(attr, id.Substring(0,indexOfX+1));
 113                                 }
 114                                 return attr;
 115                         }
 116                 }
 117
 118                 public override string Value
 119                 {
 120                         get {
 121                                 string v = Attributes ["value"];
 122                                 if (v != null && v != "")
 123                                         return v;
 124                                 v = ID;
 125                                 Attributes ["value"] = v;
 126                                 return v;
 127                         }
 128
 129                         set { Attributes ["value"] = value; }
 130                 }
 131
 132         } // class HtmlInputRadioButton
 133 } // namespace System.Web.UI.HtmlControls
 134