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) 2005-2010 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 	{
HtmlContainerControl()60 		protected HtmlContainerControl () : this ("span")
61 		{}
62 
HtmlContainerControl(string tag)63 		public HtmlContainerControl (string tag) : base(tag)
64 		{}
65 
66 		[HtmlControlPersistable (false)]
67 		[BrowsableAttribute(false)]
68 		[DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
69 		public virtual string InnerHtml
70 		{
71 			get {
72 				if (Controls.Count == 0)
73 					return String.Empty;
74 
75 				if (Controls.Count == 1) {
76 					Control ctrl = Controls [0];
77 					LiteralControl lc = ctrl as LiteralControl;
78 					if (lc != null)
79 						return lc.Text;
80 
81 					DataBoundLiteralControl dblc = ctrl as DataBoundLiteralControl;
82 					if (dblc != null)
83 						return dblc.Text;
84 				}
85 
86 				throw new HttpException ("There is no literal content!");
87 			}
88 
89 			set {
90 				Controls.Clear ();
91 				Controls.Add (new LiteralControl (value));
92 				if (value == null)
93 					ViewState.Remove ("innerhtml");
94 				else
95 					ViewState ["innerhtml"] = value;
96 			}
97 		}
98 
99 		[HtmlControlPersistable (false)]
100 		[BrowsableAttribute(false)]
101 		[DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
102 		public virtual string InnerText
103 		{
104 			get {
105 				return HttpUtility.HtmlDecode (InnerHtml);
106 			}
107 
108 			set {
109 				InnerHtml = HttpUtility.HtmlEncode (value);
110 			}
111 		}
112 
Render(HtmlTextWriter writer)113 		protected internal override void Render (HtmlTextWriter writer)
114 		{
115 			RenderBeginTag (writer);
116 			RenderChildren (writer);
117 			RenderEndTag (writer);
118 		}
119 
RenderEndTag(HtmlTextWriter writer)120 		protected virtual void RenderEndTag (HtmlTextWriter writer)
121 		{
122 			writer.WriteEndTag (TagName);
123 		}
124 
RenderAttributes(HtmlTextWriter writer)125 		protected override void RenderAttributes (HtmlTextWriter writer)
126 		{
127 			ViewState.Remove ("innerhtml");
128 			base.RenderAttributes (writer);
129 		}
130 
131 		/* we need to override this because our base class
132 		 * (HtmlControl) returns an instance of
133 		 * EmptyControlCollection. */
CreateControlCollection()134 		protected override ControlCollection CreateControlCollection ()
135 		{
136 			return new ControlCollection (this);
137 		}
138 
LoadViewState(object savedState)139 		protected override void LoadViewState (object savedState)
140 		{
141 			if (savedState != null) {
142 				base.LoadViewState (savedState);
143 				string inner = ViewState ["innerhtml"] as string;
144 				if (inner != null)
145 					InnerHtml = inner;
146 			}
147 		}
148 	}
149 }
150