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

   1 //
   2 // System.Web.UI.HtmlControls.HtmlContainerControl.cs
   3 //
   4 // Authors:
   5 //      Bob Smith <bob@thestuff.net>
   6 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   7 //
   8 // (C) Bob Smith
   9 // (c) 2002 Ximian, Inc. (http://www.ximian.com)
  10 //
  11
  12 using System;
  13 using System.ComponentModel;
  14 using System.Text;
  15 using System.Web;
  16 using System.Web.UI;
  17
  18 //LAMESPEC: The dox talk about HttpException but are very ambigious.
  19 //TODO: Check to see if Render really is overridden instead of a LiteralControl being added. It apears that this is the
  20 //case due to testing. Anything inside the block is overwritten by the content of this control, so it doesnt apear
  21 //to do anything with children.
  22 // a doc references this. add? protected override ControlCollection CreateControlCollection();
  23
  24 //TODO: If Test.InnerText = Test.InnerHtml without ever assigning anything into InnerHtml, you get this:
  25 // Exception Details: System.Web.HttpException: Cannot get inner content of Message because the contents are not literal.
  26 //[HttpException (0x80004005): Cannot get inner content of Message because the contents are not literal.]
  27 //  System.Web.UI.HtmlControls.HtmlContainerControl.get_InnerHtml() +278
  28 //  ASP.test3_aspx.AnchorBtn_Click(Object Source, EventArgs E) in \\genfs2\www24\bobsmith11\test3.aspx:6
  29 //  System.Web.UI.HtmlControls.HtmlAnchor.OnServerClick(EventArgs e) +108
  30 //  System.Web.UI.HtmlControls.HtmlAnchor.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +26
  31 //  System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +18
  32 //  System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +149
  33 //  System.Web.UI.Page.ProcessRequestMain() +660
  34
  35
  36 namespace System.Web.UI.HtmlControls
  37 {
  38         public abstract class HtmlContainerControl : HtmlControl{
  39
  40 #if NET_2_0
  41                 protected
  42 #else
  43                 public
  44 #endif
  45                 HtmlContainerControl () : this ("span") {}
  46
  47                 public HtmlContainerControl (string tag) : base(tag) {}
  48
  49                 [HtmlControlPersistable (false)]
  50                 [BrowsableAttribute(false)]
  51                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
  52                 public virtual string InnerHtml
  53                 {
  54                         get {
  55                                 if (Controls.Count == 0)
  56                                         return String.Empty;
  57
  58                                 bool is_literal = true;
  59                                 StringBuilder text = new StringBuilder ();
  60                                 foreach (Control ctrl in Controls) {
  61                                         LiteralControl lc = ctrl as LiteralControl;
  62                                         if (lc == null) {
  63                                                 is_literal = false;
  64                                                 break;
  65                                         }
  66                                         text.Append (lc.Text);
  67                                 }
  68
  69                                 if (!is_literal)
  70                                         throw new HttpException ("There is no literal content!");
  71
  72                                 return text.ToString ();
  73                         }
  74
  75                         set {
  76                                 Controls.Clear ();
  77                                 Controls.Add (new LiteralControl (value));
  78                                 if (value == null)
  79                                         ViewState.Remove ("innerhtml");
  80                                 else
  81                                         ViewState ["innerhtml"] = value;
  82                         }
  83                 }
  84
  85                 [HtmlControlPersistable (false)]
  86                 [BrowsableAttribute(false)]
  87                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
  88                 public virtual string InnerText
  89                 {
  90                         get {
  91                                 return HttpUtility.HtmlDecode (InnerHtml);
  92                         }
  93
  94                         set {
  95                                 InnerHtml = HttpUtility.HtmlEncode (value);
  96                         }
  97                 }
  98
  99 #if NET_2_0
 100                 protected internal
 101 #else
 102                 protected
 103 #endif
 104                 override void Render (HtmlTextWriter writer)
 105                 {
 106                         RenderBeginTag (writer);
 107                         RenderChildren (writer);
 108                         RenderEndTag (writer);
 109                 }
 110
 111                 protected virtual void RenderEndTag (HtmlTextWriter writer)
 112                 {
 113                         writer.WriteEndTag (TagName);
 114                 }
 115
 116                 protected override void RenderAttributes (HtmlTextWriter writer)
 117                 {
 118                         ViewState.Remove ("innerhtml");
 119                         base.RenderAttributes (writer);
 120                 }
 121
 122                 protected override ControlCollection CreateControlCollection ()
 123                 {
 124                         return new ControlCollection (this);
 125                 }
 126
 127                 protected override void LoadViewState (object savedState)
 128                 {
 129                         if (savedState != null) {
 130                                 base.LoadViewState (savedState);
 131                                 string inner = ViewState ["innerhtml"] as string;
 132                                 if (inner != null)
 133                                         InnerHtml = inner;
 134                         }
 135                 }
 136         }
 137 }