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

   1 /*      System.Web.UI.HtmlControls\r
   2 *       Authors\r
   3 *               Leen Toelen (toelen@hotmail.com)\r
   4 */\r
   5 \r
   6 using System;\r
   7 using System.Collections.Specialized;\r
   8 using System.ComponentModel;\r
   9 using System.Globalization;\r
  10 using System.Web;\r
  11 using System.Web.UI;\r
  12 \r
  13 namespace System.Web.UI.HtmlControls{\r
  14         \r
  15         [DefaultEvent("ServerChange")]\r
  16         public class HtmlInputCheckBox : HtmlInputControl, IPostBackDataHandler{\r
  17                 \r
  18                 private static readonly object EventServerChange = new object ();\r
  19                 \r
  20                 public HtmlInputCheckBox(): base("checkbox"){}\r
  21                 \r
  22                 bool IPostBackDataHandler.LoadPostData (string postDataKey, \r
  23                                                                NameValueCollection postCollection)\r
  24                 {\r
  25                         string postValue = postCollection [postDataKey];\r
  26                         bool postChecked = false;\r
  27                         bool retval = false;\r
  28 \r
  29                         if (postValue != null)\r
  30                                 postChecked = postValue.Length > 0;\r
  31 \r
  32                         if (Checked != postChecked){\r
  33                                 retval = true;\r
  34                                 Checked = postChecked;\r
  35                         }\r
  36 \r
  37                         return retval;\r
  38                 }\r
  39                 \r
  40                 void IPostBackDataHandler.RaisePostDataChangedEvent ()\r
  41                 {\r
  42                         OnServerChange (EventArgs.Empty);\r
  43                 }\r
  44                 \r
  45                 protected virtual void OnServerChange(EventArgs e){\r
  46                         EventHandler handler = (EventHandler) Events[EventServerChange];\r
  47                         if (handler != null)\r
  48                                 handler (this, e);\r
  49                 }\r
  50                 \r
  51                 protected override void OnPreRender(EventArgs e){\r
  52                         if (Page != null && !Disabled)\r
  53                                 Page.RegisterRequiresPostBack(this);\r
  54                         if (Events[EventServerChange] != null && !Disabled)\r
  55                                 ViewState.SetItemDirty("checkbox",false);\r
  56                 }\r
  57                 \r
  58                 [WebCategory("Action")]\r
  59                 [WebSysDescription("Fires when the checked satte of the control is changed.")]\r
  60                 public event EventHandler ServerChange{\r
  61                         add{\r
  62                                 Events.AddHandler(EventServerChange, value);\r
  63                         }\r
  64                         remove{\r
  65                                 Events.RemoveHandler(EventServerChange, value);\r
  66                         }\r
  67                 }\r
  68                 \r
  69                 [DefaultValue("")]\r
  70                 [WebCategory("Misc")]\r
  71                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]\r
  72                 public bool Checked{\r
  73                         get{\r
  74                                 string attr = Attributes["checked"];\r
  75                                 if (attr != null)\r
  76                                         return attr.Equals("checked");\r
  77                                 return false;\r
  78                         }\r
  79                         set{\r
  80                                 Attributes["checked"] = (value == true)? "checked": null;\r
  81                         }\r
  82                 }\r
  83                 \r
  84         } // class HtmlInputCheckBox\r
  85 } // namespace System.Web.UI.HtmlControls\r
  86 \r