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 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32 using System.ComponentModel;
  33 using System.Security.Permissions;
  34 using System.Text;
  35
  36 //LAMESPEC: The dox talk about HttpException but are very ambigious.
  37 //TODO: Check to see if Render really is overridden instead of a LiteralControl being added. It apears that this is the
  38 //case due to testing. Anything inside the block is overwritten by the content of this control, so it doesnt apear
  39 //to do anything with children.
  40
  41 //TODO: If Test.InnerText = Test.InnerHtml without ever assigning anything into InnerHtml, you get this:
  42 // Exception Details: System.Web.HttpException: Cannot get inner content of Message because the contents are not literal.
  43 //[HttpException (0x80004005): Cannot get inner content of Message because the contents are not literal.]
  44 //  System.Web.UI.HtmlControls.HtmlContainerControl.get_InnerHtml() +278
  45 //  ASP.test3_aspx.AnchorBtn_Click(Object Source, EventArgs E) in \\genfs2\www24\bobsmith11\test3.aspx:6
  46 //  System.Web.UI.HtmlControls.HtmlAnchor.OnServerClick(EventArgs e) +108
  47 //  System.Web.UI.HtmlControls.HtmlAnchor.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +26
  48 //  System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +18
  49 //  System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +149
  50 //  System.Web.UI.Page.ProcessRequestMain() +660
  51
  52
  53 namespace System.Web.UI.HtmlControls
  54 {
  55         // CAS
  56         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  57         [AspNetHostingPermission (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  58         public abstract class HtmlContainerControl : HtmlControl {
  59
  60 #if NET_2_0
  61                 protected
  62 #else
  63                 public
  64 #endif
  65                 HtmlContainerControl () : this ("span") {}
  66
  67                 public HtmlContainerControl (string tag) : base(tag) {}
  68
  69                 [HtmlControlPersistable (false)]
  70                 [BrowsableAttribute(false)]
  71                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
  72                 public virtual string InnerHtml
  73                 {
  74                         get {
  75                                 if (Controls.Count == 0)
  76                                         return String.Empty;
  77
  78                                 if (Controls.Count == 1) {
  79                                         Control ctrl = Controls [0];
  80                                         LiteralControl lc = ctrl as LiteralControl;
  81                                         if (lc != null)
  82                                                 return lc.Text;
  83
  84                                         DataBoundLiteralControl dblc = ctrl as DataBoundLiteralControl;
  85                                         if (dblc != null)
  86                                                 return dblc.Text;
  87                                 }
  88
  89                                 throw new HttpException ("There is no literal content!");
  90                         }
  91
  92                         set {
  93                                 Controls.Clear ();
  94                                 Controls.Add (new LiteralControl (value));
  95                                 if (value == null)
  96                                         ViewState.Remove ("innerhtml");
  97                                 else
  98                                         ViewState ["innerhtml"] = value;
  99                         }
 100                 }
 101
 102                 [HtmlControlPersistable (false)]
 103                 [BrowsableAttribute(false)]
 104                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 105                 public virtual string InnerText
 106                 {
 107                         get {
 108                                 return HttpUtility.HtmlDecode (InnerHtml);
 109                         }
 110
 111                         set {
 112                                 InnerHtml = HttpUtility.HtmlEncode (value);
 113                         }
 114                 }
 115
 116 #if NET_2_0
 117                 protected internal
 118 #else
 119                 protected
 120 #endif
 121                 override void Render (HtmlTextWriter writer)
 122                 {
 123                         RenderBeginTag (writer);
 124                         RenderChildren (writer);
 125                         RenderEndTag (writer);
 126                 }
 127
 128                 protected virtual void RenderEndTag (HtmlTextWriter writer)
 129                 {
 130                         writer.WriteEndTag (TagName);
 131                 }
 132
 133                 protected override void RenderAttributes (HtmlTextWriter writer)
 134                 {
 135                         ViewState.Remove ("innerhtml");
 136                         base.RenderAttributes (writer);
 137                 }
 138
 139                 /* we need to override this because our base class
 140                  * (HtmlControl) returns an instance of
 141                  * EmptyControlCollection. */
 142                 protected override ControlCollection CreateControlCollection ()
 143                 {
 144                         return new ControlCollection (this);
 145                 }
 146
 147                 protected override void LoadViewState (object savedState)
 148                 {
 149                         if (savedState != null) {
 150                                 base.LoadViewState (savedState);
 151                                 string inner = ViewState ["innerhtml"] as string;
 152                                 if (inner != null)
 153                                         InnerHtml = inner;
 154                         }
 155                 }
 156         }
 157 }