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                 public HtmlContainerControl () : this ("span") {}
  41
  42                 public HtmlContainerControl (string tag) : base(tag) {}
  43
  44                 [HtmlControlPersistable (false)]
  45                 [BrowsableAttribute(false)]
  46                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
  47                 public virtual string InnerHtml
  48                 {
  49                         get {
  50                                 if (Controls.Count == 0)
  51                                         return String.Empty;
  52
  53                                 bool is_literal = true;
  54                                 StringBuilder text = new StringBuilder ();
  55                                 foreach (Control ctrl in Controls) {
  56                                         LiteralControl lc = ctrl as LiteralControl;
  57                                         if (lc == null) {
  58                                                 is_literal = false;
  59                                                 break;
  60                                         }
  61                                         text.Append (lc.Text);
  62                                 }
  63
  64                                 if (!is_literal)
  65                                         throw new HttpException ("There is no literal content!");
  66
  67                                 return text.ToString ();
  68                         }
  69
  70                         set {
  71                                 Controls.Clear ();
  72                                 Controls.Add (new LiteralControl (value));
  73                                 ViewState ["innerhtml"] = value;
  74                         }
  75                 }
  76
  77                 [HtmlControlPersistable (false)]
  78                 [BrowsableAttribute(false)]
  79                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
  80                 public virtual string InnerText
  81                 {
  82                         get {
  83                                 return HttpUtility.HtmlDecode (InnerHtml);
  84                         }
  85
  86                         set {
  87                                 InnerHtml = HttpUtility.HtmlEncode (value);
  88                         }
  89                 }
  90
  91                 protected override void Render (HtmlTextWriter writer)
  92                 {
  93                         RenderBeginTag (writer);
  94                         RenderChildren (writer);
  95                         RenderEndTag (writer);
  96                 }
  97
  98                 protected virtual void RenderEndTag (HtmlTextWriter writer)
  99                 {
 100                         writer.WriteEndTag (TagName);
 101                 }
 102
 103                 protected override void RenderAttributes (HtmlTextWriter writer)
 104                 {
 105                         ViewState.Remove ("innerhtml");
 106                         base.RenderAttributes (writer);
 107                 }
 108
 109                 protected override ControlCollection CreateControlCollection ()
 110                 {
 111                         return new ControlCollection (this);
 112                 }
 113
 114                 protected override void LoadViewState (object savedState)
 115                 {
 116                         if (savedState != null) {
 117                                 base.LoadViewState (savedState);
 118                                 string inner = ViewState ["innerhtml"] as string;
 119                                 if (inner != null)
 120                                         InnerHtml = inner;
 121                         }
 122                 }
 123         }
 124 }