2 // System.Web.UI.HtmlControls.HtmlHead
5 // Lluis Sanchez Gual (lluis@novell.com)
7 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
9 // Permission is hereby granted, free of charge, to any person obtaining
10 // a copy of this software and associated documentation files (the
11 // "Software"), to deal in the Software without restriction, including
12 // without limitation the rights to use, copy, modify, merge, publish,
13 // distribute, sublicense, and/or sell copies of the Software, and to
14 // permit persons to whom the Software is furnished to do so, subject to
15 // the following conditions:
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 using System.ComponentModel;
32 using System.Collections;
33 using System.Security.Permissions;
34 using System.Web.UI.WebControls;
36 namespace System.Web.UI.HtmlControls
38 // CAS - no InheritanceDemand here as the class is sealed
39 [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
41 [ControlBuilder (typeof(HtmlHeadBuilder))]
42 public sealed class HtmlHead: HtmlGenericControl, IParserAccessor {
47 ArrayList styleSheets;
48 StyleSheetBag styleSheet;
50 public HtmlHead(): base("head") {}
52 public HtmlHead (string tag) : base (tag)
56 protected internal override void OnInit (EventArgs e)
58 //You can only have one <head runat="server"> control on a page.
60 throw new HttpException ("You can only have one <head runat=\"server\"> control on a page.");
61 Page.SetHeader (this);
64 protected internal override void RenderChildren (HtmlTextWriter writer)
66 EnsureTitleControl ();
68 base.RenderChildren (writer);
69 if (metadata != null) {
70 foreach (DictionaryEntry entry in metadata) {
71 writer.AddAttribute ("name", entry.Key.ToString ());
72 writer.AddAttribute ("content", entry.Value.ToString ());
73 writer.RenderBeginTag (HtmlTextWriterTag.Meta);
74 writer.RenderEndTag ();
78 if (styleSheet != null)
79 styleSheet.Render (writer);
82 protected internal override void AddedControl (Control control, int index)
84 //You can only have one <title> element within the <head> element.
85 HtmlTitle t = control as HtmlTitle;
88 throw new HttpException ("You can only have one <title> element within the <head> element.");
92 base.AddedControl (control, index);
95 protected internal override void RemovedControl (Control control)
100 base.RemovedControl (control);
103 void EnsureTitleControl () {
107 HtmlTitle t = new HtmlTitle ();
112 IList LinkedStyleSheets {
114 if (styleSheets == null) styleSheets = new ArrayList ();
119 IDictionary Metadata {
121 if (metadata == null) metadata = new Hashtable ();
126 public IStyleSheet StyleSheet {
128 if (styleSheet == null) styleSheet = new StyleSheetBag ();
133 public string Title {
149 internal class StyleSheetBag: IStyleSheet
151 ArrayList entries = new ArrayList ();
153 internal class StyleEntry
156 public string Selection;
157 public IUrlResolutionService UrlResolver;
160 public StyleSheetBag ()
164 public void CreateStyleRule (Style style, IUrlResolutionService urlResolver, string selection)
166 StyleEntry entry = new StyleEntry ();
168 entry.UrlResolver = urlResolver;
169 entry.Selection = selection;
173 public void RegisterStyle (Style style, IUrlResolutionService urlResolver)
175 for (int n=0; n<entries.Count; n++) {
176 if (((StyleEntry)entries[n]).Style == style)
180 string name = "aspnet_" + entries.Count;
181 style.SetRegisteredCssClass (name);
182 CreateStyleRule (style, urlResolver, "." + name);
185 public void Render (HtmlTextWriter writer)
187 writer.AddAttribute ("type", "text/css");
188 writer.RenderBeginTag (HtmlTextWriterTag.Style);
190 foreach (StyleEntry entry in entries) {
191 CssStyleCollection sts = entry.Style.GetStyleAttributes (entry.UrlResolver);
192 writer.Write ("\n" + entry.Selection + " {" + sts.Value + "}");
195 writer.RenderEndTag ();