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

   1 //
   2 // System.Web.UI.HtmlControls.HtmlInputCheckBox.cs
   3 //
   4 // Author:
   5 //      Dick Porter  <dick@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 HtmlInputCheckBox : HtmlInputControl, IPostBackDataHandler
  44         {
  45                 public HtmlInputCheckBox () : base ("checkbox")
  46                 {
  47                 }
  48
  49                 [DefaultValue ("")]
  50                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
  51                 [WebSysDescription("")]
  52                 [WebCategory("Misc")]
  53 #if NET_2_0
  54                 [TypeConverter (typeof(MinimizableAttributeTypeConverter))]
  55 #endif
  56                 public bool Checked
  57                 {
  58                         get {
  59                                 string check = Attributes["checked"];
  60
  61                                 if (check == null) {
  62                                         return (false);
  63                                 }
  64
  65                                 return (true);
  66                         }
  67                         set {
  68                                 if (value == false) {
  69                                         Attributes.Remove ("checked");
  70                                 } else {
  71                                         Attributes["checked"] = "checked";
  72                                 }
  73                         }
  74                 }
  75
  76                 private static readonly object EventServerChange = new object ();
  77
  78                 [WebSysDescription("")]
  79                 [WebCategory("Action")]
  80                 public event EventHandler ServerChange
  81                 {
  82                         add {
  83                                 Events.AddHandler (EventServerChange, value);
  84                         }
  85                         remove {
  86                                 Events.RemoveHandler (EventServerChange, value);
  87                         }
  88                 }
  89
  90 #if NET_2_0
  91                 protected internal
  92 #else
  93                 protected
  94 #endif
  95                 override void OnPreRender (EventArgs e)
  96                 {
  97                         base.OnPreRender (e);
  98
  99                         if (Page != null) {
 100                                 Page.RegisterRequiresPostBack (this);
 101                         }
 102                 }
 103
 104                 protected virtual void OnServerChange (EventArgs e)
 105                 {
 106                         EventHandler handler = (EventHandler)Events[EventServerChange];
 107
 108                         if (handler != null) {
 109                                 handler (this, e);
 110                         }
 111                 }
 112
 113                 bool LoadPostDataInternal (string postDataKey, NameValueCollection postCollection)
 114                 {
 115                         string postedValue = postCollection[postDataKey];
 116                         bool postedBool = ((postedValue != null) &&
 117                                            (postedValue.Length > 0));
 118
 119                         if (Checked != postedBool) {
 120                                 Checked = postedBool;
 121                                 return (true);
 122                         }
 123
 124                         return (false);
 125                 }
 126
 127                 void RaisePostDataChangedEventInternal ()
 128                 {
 129                         OnServerChange (EventArgs.Empty);
 130                 }
 131
 132 #if NET_2_0
 133                 protected virtual bool LoadPostData (string postDataKey, NameValueCollection postCollection)
 134                 {
 135                         return LoadPostDataInternal (postDataKey, postCollection);
 136                 }
 137
 138                 protected virtual void RaisePostDataChangedEvent ()
 139                 {
 140                         RaisePostDataChangedEventInternal ();
 141                 }
 142 #endif
 143
 144                 bool IPostBackDataHandler.LoadPostData (string postDataKey, NameValueCollection postCollection)
 145                 {
 146 #if NET_2_0
 147                         return LoadPostData (postDataKey, postCollection);
 148 #else
 149                         return LoadPostDataInternal (postDataKey, postCollection);
 150 #endif
 151                 }
 152
 153                 void IPostBackDataHandler.RaisePostDataChangedEvent ()
 154                 {
 155 #if NET_2_0
 156                         RaisePostDataChangedEvent();
 157 #else
 158                         RaisePostDataChangedEventInternal ();
 159 #endif
 160                 }
 161         }
 162 }