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

   1 //
   2 // System.Web.UI.HtmlControls.HtmlInputRadioButton.cs
   3 //
   4 // Author:
   5 //      Sebastien Pouliot  <sebastien@ximian.com>
   6 //
   7 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System.ComponentModel;
  30 using System.Collections.Specialized;
  31 using System.Security.Permissions;
  32
  33 namespace System.Web.UI.HtmlControls {
  34
  35         // CAS
  36         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  37         [AspNetHostingPermission (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  38         // attributes
  39         [DefaultEvent ("ServerChange")]
  40 #if NET_2_0
  41         [SupportsEventValidation]
  42 #endif
  43         public class HtmlInputRadioButton : HtmlInputControl, IPostBackDataHandler {
  44
  45                 private static readonly object serverChangeEvent = new object ();
  46
  47
  48                 public HtmlInputRadioButton ()
  49                         : base ("radio")
  50                 {
  51                 }
  52
  53
  54                 [DefaultValue ("")]
  55                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
  56                 [WebSysDescription("")]
  57                 [WebCategory("Misc")]
  58                 public bool Checked {
  59                         get { return (Attributes ["checked"] == "checked"); }
  60                         set {
  61                                 if (value)
  62                                         Attributes ["checked"] = "checked";
  63                                 else
  64                                         Attributes.Remove ("checked");
  65                         }
  66                 }
  67
  68                 public override string Name {
  69                         get {
  70                                 string s = Attributes ["name"];
  71                                 return (s == null) ? String.Empty : s;
  72                         }
  73                         set {
  74                                 if (value == null)
  75                                         Attributes.Remove ("name");
  76                                 else
  77                                         Attributes ["name"] = value;
  78                         }
  79                 }
  80
  81                 public override string Value {
  82                         get {
  83                                 string s = Attributes ["value"];
  84                                 if (s == null || s.Length == 0) {
  85                                         s = ID;
  86                                         if ((s != null) && (s.Length == 0))
  87                                                 s = null;
  88                                 }
  89                                 return s;
  90                         }
  91                         set {
  92                                 if (value == null)
  93                                         Attributes.Remove ("value");
  94                                 else
  95                                         Attributes ["value"] = value;
  96                         }
  97                 }
  98
  99
 100 #if NET_2_0
 101                 protected internal
 102 #else
 103                 protected
 104 #endif
 105                 override void OnPreRender (EventArgs e)
 106                 {
 107                         base.OnPreRender (e);
 108
 109                         if (Page != null) {
 110                                 Page.RegisterRequiresPostBack (this);
 111                         }
 112                 }
 113
 114                 protected virtual void OnServerChange (EventArgs e)
 115                 {
 116                         EventHandler serverChange = (EventHandler) Events [serverChangeEvent];
 117                         if (serverChange != null)
 118                                 serverChange (this, e);
 119                 }
 120
 121                 protected override void RenderAttributes (HtmlTextWriter writer)
 122                 {
 123                         writer.WriteAttribute ("value", Value);
 124                         Attributes.Remove ("value");
 125                         base.RenderAttributes (writer);
 126                 }
 127 #if NET_2_0
 128                 protected virtual bool LoadPostData (string postDataKey, NameValueCollection postCollection)
 129                 {
 130                         return DefaultLoadPostData (postDataKey, postCollection);
 131                 }
 132
 133                 protected virtual void RaisePostDataChangedEvent ()
 134                 {
 135                         OnServerChange (EventArgs.Empty);
 136                 }
 137 #endif
 138
 139                 internal bool DefaultLoadPostData (string postDataKey, NameValueCollection postCollection)
 140                 {
 141                         string s = postCollection [postDataKey];
 142                         if ((s != null) && (Attributes ["value"] != postDataKey)) {
 143                                 Attributes ["value"] = postDataKey;
 144                                 // this doesn't seems to trigger a change
 145                         }
 146                         return false;
 147                 }
 148
 149                 bool IPostBackDataHandler.LoadPostData (string postDataKey, NameValueCollection postCollection)
 150                 {
 151 #if NET_2_0
 152                         return LoadPostData (postDataKey, postCollection);
 153 #else
 154                         return DefaultLoadPostData (postDataKey, postCollection);
 155 #endif
 156                 }
 157
 158                 void IPostBackDataHandler.RaisePostDataChangedEvent ()
 159                 {
 160 #if NET_2_0
 161                         RaisePostDataChangedEvent ();
 162 #else
 163                         OnServerChange (EventArgs.Empty);
 164 #endif
 165                 }
 166
 167
 168                 [WebSysDescription("")]
 169                 [WebCategory("Action")]
 170                 public event EventHandler ServerChange {
 171                         add { Events.AddHandler (serverChangeEvent, value); }
 172                         remove { Events.RemoveHandler (serverChangeEvent, value); }
 173                 }
 174         }
 175 }