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) 2005-2010 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         [SupportsEventValidation]
  41         public class HtmlInputCheckBox : HtmlInputControl, IPostBackDataHandler
  42         {
  43                 static readonly object EventServerChange = new object ();
  44
  45                 public HtmlInputCheckBox () : base ("checkbox")
  46                 {
  47                 }
  48
  49                 [DefaultValue ("")]
  50                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
  51                 [WebSysDescription("")]
  52                 [WebCategory("Misc")]
  53                 [TypeConverter (typeof(MinimizableAttributeTypeConverter))]
  54                 public bool Checked {
  55                         get {
  56                                 string check = Attributes["checked"];
  57
  58                                 if (check == null) {
  59                                         return (false);
  60                                 }
  61
  62                                 return (true);
  63                         }
  64                         set {
  65                                 if (value == false) {
  66                                         Attributes.Remove ("checked");
  67                                 } else {
  68                                         Attributes["checked"] = "checked";
  69                                 }
  70                         }
  71                 }
  72
  73                 [WebSysDescription("")]
  74                 [WebCategory("Action")]
  75                 public event EventHandler ServerChange {
  76                         add {
  77                                 Events.AddHandler (EventServerChange, value);
  78                         }
  79                         remove {
  80                                 Events.RemoveHandler (EventServerChange, value);
  81                         }
  82                 }
  83
  84                 protected override void RenderAttributes (HtmlTextWriter writer)
  85                 {
  86                         Page page = Page;
  87                         if (page != null)
  88                                 page.ClientScript.RegisterForEventValidation (UniqueID);
  89                         base.RenderAttributes (writer);
  90                 }
  91
  92                 protected internal override void OnPreRender (EventArgs e)
  93                 {
  94                         base.OnPreRender (e);
  95
  96                         Page page = Page;
  97                         if (page != null && !Disabled) {
  98                                 page.RegisterRequiresPostBack (this);
  99                                 page.RegisterEnabledControl (this);
 100                         }
 101                 }
 102
 103                 protected virtual void OnServerChange (EventArgs e)
 104                 {
 105                         EventHandler handler = (EventHandler)Events[EventServerChange];
 106
 107                         if (handler != null)
 108                                 handler (this, e);
 109                 }
 110
 111                 bool LoadPostDataInternal (string postDataKey, NameValueCollection postCollection)
 112                 {
 113                         string postedValue = postCollection[postDataKey];
 114                         bool postedBool = ((postedValue != null) &&
 115                                            (postedValue.Length > 0));
 116
 117                         if (Checked != postedBool) {
 118                                 Checked = postedBool;
 119                                 return (true);
 120                         }
 121
 122                         return (false);
 123                 }
 124
 125                 void RaisePostDataChangedEventInternal ()
 126                 {
 127                         OnServerChange (EventArgs.Empty);
 128                 }
 129
 130                 protected virtual bool LoadPostData (string postDataKey, NameValueCollection postCollection)
 131                 {
 132                         return LoadPostDataInternal (postDataKey, postCollection);
 133                 }
 134
 135                 protected virtual void RaisePostDataChangedEvent ()
 136                 {
 137                         ValidateEvent (UniqueID, String.Empty);
 138                         RaisePostDataChangedEventInternal ();
 139                 }
 140
 141                 bool IPostBackDataHandler.LoadPostData (string postDataKey, NameValueCollection postCollection)
 142                 {
 143                         return LoadPostData (postDataKey, postCollection);
 144                 }
 145
 146                 void IPostBackDataHandler.RaisePostDataChangedEvent ()
 147                 {
 148                         RaisePostDataChangedEvent();
 149                 }
 150         }
 151 }