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

   1 /*      System.Web.UI.HtmlControls
   2 *       Authors
   3 *               Leen Toelen (toelen@hotmail.com)
   4 */
   5
   6 using System;
   7 using System.Web;
   8 using System.Web.UI;
   9 using System.ComponentModel;
  10 using System.Globalization;
  11 using System.Collections.Specialized;
  12
  13 namespace System.Web.UI.HtmlControls{
  14
  15         [DefaultEvent("ServerChange")]
  16         [ValidationProperty("Value")]
  17         public class HtmlTextArea : HtmlContainerControl, IPostBackDataHandler{
  18
  19                 private static readonly object EventServerChange = new object ();
  20
  21                 public HtmlTextArea(): base("textarea"){}
  22
  23                 [DefaultValue("")]
  24                 [WebCategory("Appearance")]
  25                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
  26                 public int Cols{
  27                         get{
  28                                 string attr = Attributes["cols"];
  29                                 if (attr != null){
  30                                         return Int32.Parse(attr, CultureInfo.InvariantCulture);
  31                                 }
  32                                 return -1;
  33                         }
  34                         set{
  35                                 Attributes["cols"] = AttributeToString(value);
  36                         }
  37                 }
  38
  39                 [DefaultValue("")]
  40                 [WebCategory("Appearance")]
  41                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
  42                 public int Rows{
  43                         get{
  44                                 string attr = Attributes["rows"];
  45                                 if (attr != null){
  46                                         return Int32.Parse(attr, CultureInfo.InvariantCulture);
  47                                 }
  48                                 return -1;
  49                         }
  50                         set{
  51                                 Attributes["rows"] = AttributeToString(value);
  52                         }
  53                 }
  54
  55                 [DefaultValue("")]
  56                 [WebCategory("Appearance")]
  57                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
  58                 public string Value{
  59                         get{
  60                                 return InnerHtml;
  61                         }
  62                         set{
  63                                 InnerHtml = value;
  64                         }
  65                 }
  66
  67                 [DefaultValue("")]
  68                 [WebCategory("Behavior")]
  69                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
  70                 public virtual string Name{
  71                         get{
  72                                 if (UniqueID != null){
  73                                         return UniqueID;
  74                                 }
  75                                 return String.Empty;
  76                         }
  77                         set{}
  78                 }
  79
  80                 [WebCategory("Action")]
  81                 [WebSysDescription("Fires when the text within the control changes.")]
  82                 public event EventHandler ServerChange{
  83                         add{
  84                                 Events.AddHandler(EventServerChange, value);
  85                         }
  86                         remove{
  87                                 Events.RemoveHandler(EventServerChange, value);
  88                         }
  89                 }
  90
  91                 protected virtual void OnServerChange(EventArgs e){
  92                         EventHandler handler;
  93                         handler = (EventHandler) Events[EventServerChange];
  94                         if(handler != null){
  95                                 handler (this, e);
  96                         }
  97                 }
  98
  99                 bool IPostBackDataHandler.LoadPostData (string postDataKey,
 100                                                         NameValueCollection postCollection)
 101                 {
 102                         string currentValue = Value;
 103                         string postedValue = postCollection[postDataKey];
 104                         if (!currentValue.Equals(postedValue) && currentValue != null){
 105                                 Value = HttpUtility.HtmlEncode(postedValue);
 106                                 return true;
 107                         }
 108                         return false;
 109                 }
 110
 111                 protected override void RenderAttributes(HtmlTextWriter writer){
 112                         writer.WriteAttribute("name", Name);
 113                         Attributes.Remove("name");
 114                         base.RenderAttributes(writer);
 115                 }
 116
 117                 void IPostBackDataHandler.RaisePostDataChangedEvent ()
 118                 {
 119                         OnServerChange (EventArgs.Empty);
 120                 }
 121
 122                 protected override void OnPreRender(EventArgs e){
 123                         if(Events[EventServerChange]==null || Disabled){
 124                                 ViewState.SetItemDirty("value",false);
 125                         }
 126                 }
 127
 128                 protected override void AddParsedSubObject(object obj){
 129                         if (obj is LiteralControl || obj is DataBoundLiteralControl)
 130                                 base.AddParsedSubObject(obj);
 131                         else
 132                                 throw new NotSupportedException("HtmlTextArea cannot have children of Type " + obj.GetType().Name);
 133                 }
 134
 135         } // class HtmlTextArea
 136 } // namespace System.Web.UI.HtmlControls
 137