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

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   4 // "Software"), to deal in the Software without restriction, including
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   8 // the following conditions:
   9 //
  10 // The above copyright notice and this permission notice shall be
  11 // included in all copies or substantial portions of the Software.
  12 //
  13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  14 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  15 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  16 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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  19 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  20 //
  21 //
  22 // System.Web.UI.HtmlControls.HtmlInputHidden.cs
  23 //
  24 // Authors:
  25 //      Jackson Harper (jackson@ximian.com)
  26 //
  27 // (C) 2005 Novell, Inc.
  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 HtmlInputHidden : HtmlInputControl, IPostBackDataHandler {
  44
  45                 static readonly object ServerChangeEvent = new object ();
  46
  47                 public HtmlInputHidden () : base ("hidden")
  48                 {
  49                 }
  50
  51                 bool LoadPostDataInternal (string postDataKey, NameValueCollection postCollection)
  52                 {
  53                         string data = postCollection [postDataKey];
  54                         if (data != null && data != Value) {
  55 #if NET_2_0
  56                                 ValidateEvent (postDataKey, String.Empty);
  57 #endif
  58                                 Value = data;
  59                                 return true;
  60                         }
  61                         return false;
  62                 }
  63
  64                 void RaisePostDataChangedEventInternal ()
  65                 {
  66                         OnServerChange (EventArgs.Empty);
  67                 }
  68
  69 #if NET_2_0
  70                 protected virtual bool LoadPostData (string postDataKey, NameValueCollection postCollection)
  71                 {
  72                         return LoadPostDataInternal (postDataKey, postCollection);
  73                 }
  74
  75                 protected virtual void RaisePostDataChangedEvent ()
  76                 {
  77                         RaisePostDataChangedEventInternal ();
  78                 }
  79 #endif
  80
  81                 bool IPostBackDataHandler.LoadPostData (string postDataKey,
  82                                                         NameValueCollection postCollection)
  83                 {
  84 #if NET_2_0
  85                         return LoadPostData (postDataKey, postCollection);
  86 #else
  87                         return LoadPostDataInternal (postDataKey, postCollection);
  88 #endif
  89                 }
  90
  91                 void IPostBackDataHandler.RaisePostDataChangedEvent ()
  92                 {
  93 #if NET_2_0
  94                         RaisePostDataChangedEvent ();
  95 #else
  96                         RaisePostDataChangedEventInternal ();
  97 #endif
  98                 }
  99
 100 #if NET_2_0
 101                 protected override void RenderAttributes (HtmlTextWriter writer)
 102                 {
 103                         Page page = Page;
 104                         if (page != null)
 105                                 page.ClientScript.RegisterForEventValidation (Name);
 106                         base.RenderAttributes (writer);
 107                 }
 108
 109                 protected internal
 110 #else
 111                 protected
 112 #endif
 113                 override void OnPreRender (EventArgs e)
 114                 {
 115                         base.OnPreRender (e);
 116
 117                         if (Page != null && !Disabled) {
 118                                 Page.RegisterRequiresPostBack (this);
 119 #if NET_2_0
 120                                 Page.RegisterEnabledControl (this);
 121 #endif
 122                         }
 123                 }
 124
 125                 protected virtual void OnServerChange (EventArgs e)
 126                 {
 127                         EventHandler handler = (EventHandler) Events [ServerChangeEvent];
 128                         if (handler != null)
 129                                 handler (this, e);
 130                 }
 131
 132                 [WebSysDescription("")]
 133                 [WebCategory("Action")]
 134                 public event EventHandler ServerChange {
 135                         add { Events.AddHandler (ServerChangeEvent, value); }
 136                         remove { Events.RemoveHandler (ServerChangeEvent, value); }
 137                 }
 138         }
 139 }