mcs/class/System.Web/System.Web.UI.HtmlControls/HtmlTextArea.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.Web;\r
   8 using System.Web.UI;\r
   9 using System.ComponentModel;\r
  10 using System.Globalization;\r
  11 using System.Collections.Specialized;\r
  12 \r
  13 namespace System.Web.UI.HtmlControls{\r
  14         \r
  15         [DefaultEvent("ServerChange")]\r
  16         [ValidationProperty("Value")]\r
  17         public class HtmlTextArea : HtmlContainerControl, IPostBackDataHandler{\r
  18                 \r
  19                 private static readonly object EventServerChange = new object ();\r
  20                 \r
  21                 public HtmlTextArea(): base("textarea"){}\r
  22                 \r
  23                 [DefaultValue("")]\r
  24                 [WebCategory("Appearance")]\r
  25                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]\r
  26                 public int Cols{\r
  27                         get{\r
  28                                 string attr = Attributes["cols"];\r
  29                                 if (attr != null){\r
  30                                         return Int32.Parse(attr, CultureInfo.InvariantCulture);\r
  31                                 }\r
  32                                 return -1;\r
  33                         }\r
  34                         set{\r
  35                                 Attributes["cols"] = AttributeToString(value);\r
  36                         }\r
  37                 }\r
  38                 \r
  39                 [DefaultValue("")]\r
  40                 [WebCategory("Appearance")]\r
  41                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]\r
  42                 public int Rows{\r
  43                         get{\r
  44                                 string attr = Attributes["rows"];\r
  45                                 if (attr != null){\r
  46                                         return Int32.Parse(attr, CultureInfo.InvariantCulture);;\r
  47                                 }\r
  48                                 return -1;\r
  49                         }\r
  50                         set{\r
  51                                 Attributes["rows"] = AttributeToString(value);\r
  52                         }\r
  53                 }\r
  54                 \r
  55                 [DefaultValue("")]\r
  56                 [WebCategory("Appearance")]\r
  57                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]\r
  58                 public string Value{\r
  59                         get{\r
  60                                 return InnerHtml;\r
  61                         }\r
  62                         set{\r
  63                                 InnerHtml = value;\r
  64                         }\r
  65                 }\r
  66                         \r
  67                 [DefaultValue("")]\r
  68                 [WebCategory("Behavior")]\r
  69                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]\r
  70                 public virtual string Name{\r
  71                         get{\r
  72                                 if (UniqueID != null){\r
  73                                         return UniqueID;\r
  74                                 }\r
  75                                 return String.Empty;\r
  76                         }\r
  77                         set{}\r
  78                 }\r
  79                 \r
  80                 [WebCategory("Action")]\r
  81                 [WebSysDescription("Fires when the text within the control changes.")]\r
  82                 public event EventHandler ServerChange{\r
  83                         add{\r
  84                                 Events.AddHandler(EventServerChange, value);\r
  85                         }\r
  86                         remove{\r
  87                                 Events.RemoveHandler(EventServerChange, value);\r
  88                         }\r
  89                 }\r
  90                 \r
  91                 protected virtual void OnServerChange(EventArgs e){\r
  92                         EventHandler handler;\r
  93                         handler = (EventHandler) Events[EventServerChange];\r
  94                         if(handler != null){\r
  95                                 handler.Invoke(this, e);\r
  96                         }\r
  97                 }\r
  98                 \r
  99                 bool IPostBackDataHandler.LoadPostData (string postDataKey,\r
 100                                                         NameValueCollection postCollection)\r
 101                 {\r
 102                         string currentValue = Value;\r
 103                         string postedValue = postCollection[postDataKey];\r
 104                         if (!currentValue.Equals(postedValue) && currentValue != null){\r
 105                                 Value = HttpUtility.HtmlEncode(postedValue);\r
 106                                 return true;\r
 107                         }\r
 108                         return false;\r
 109                 }\r
 110                 \r
 111                 protected override void RenderAttributes(HtmlTextWriter writer){\r
 112                         writer.WriteAttribute("name", Name);\r
 113                         Attributes.Remove("name");\r
 114                         base.RenderAttributes(writer);\r
 115                 }\r
 116                 \r
 117                 void IPostBackDataHandler.RaisePostDataChangedEvent ()\r
 118                 {\r
 119                         OnServerChange (EventArgs.Empty);\r
 120                 }\r
 121                 \r
 122                 protected override void OnPreRender(EventArgs e){\r
 123                         if(Events[EventServerChange]==null || Disabled){\r
 124                                 ViewState.SetItemDirty("value",false);\r
 125                         }\r
 126                 }\r
 127                 \r
 128                 protected override void AddParsedSubObject(object obj){\r
 129                         if (obj is LiteralControl || obj is DataBoundLiteralControl)\r
 130                                 AddParsedSubObject(obj);\r
 131                         else\r
 132                                 throw new NotSupportedException("HtmlTextArea cannot have children of Type " + obj.GetType().Name);\r
 133                 }\r
 134                 \r
 135         } // class HtmlTextArea\r
 136 } // namespace System.Web.UI.HtmlControls\r
 137 \r