2 // System.Web.UI.HtmlControls.HtmlHead
5 // Lluis Sanchez Gual (lluis@novell.com)
7 // Copyright (C) 2004-2009 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
45 string descriptionText;
47 HtmlMeta descriptionMeta;
48 HtmlMeta keywordsMeta;
53 StyleSheetBag styleSheet;
55 public HtmlHead(): base("head") {}
57 public HtmlHead (string tag) : base (tag)
61 protected internal override void OnInit (EventArgs e)
67 throw new HttpException ("The <head runat=\"server\"> control requires a page.");
69 //You can only have one <head runat="server"> control on a page.
70 if(page.Header != null)
71 throw new HttpException ("You can only have one <head runat=\"server\"> control on a page.");
72 page.SetHeader (this);
75 protected internal override void RenderChildren (HtmlTextWriter writer)
77 EnsureTitleControl ();
79 base.RenderChildren (writer);
80 // if (metadata != null) {
81 // foreach (DictionaryEntry entry in metadata) {
82 // writer.AddAttribute ("name", entry.Key.ToString ());
83 // writer.AddAttribute ("content", entry.Value.ToString ());
84 // writer.RenderBeginTag (HtmlTextWriterTag.Meta);
85 // writer.RenderEndTag ();
89 if (styleSheet != null)
90 styleSheet.Render (writer);
93 protected internal override void AddedControl (Control control, int index)
95 //You can only have one <title> element within the <head> element.
96 HtmlTitle t = control as HtmlTitle;
99 throw new HttpException ("You can only have one <title> element within the <head> element.");
104 HtmlMeta meta = control as HtmlMeta;
106 if (String.Compare ("keywords", meta.Name, StringComparison.OrdinalIgnoreCase) == 0)
108 else if (String.Compare ("description", meta.Name, StringComparison.OrdinalIgnoreCase) == 0)
109 descriptionMeta = meta;
112 base.AddedControl (control, index);
115 protected internal override void RemovedControl (Control control)
117 if (title == control)
121 if (keywordsMeta == control)
123 else if (descriptionMeta == control)
124 descriptionMeta = null;
126 base.RemovedControl (control);
129 void EnsureTitleControl () {
133 HtmlTitle t = new HtmlTitle ();
138 // IList LinkedStyleSheets {
140 // if (styleSheets == null) styleSheets = new ArrayList ();
141 // return styleSheets;
145 // IDictionary Metadata {
147 // if (metadata == null) metadata = new Hashtable ();
153 public string Description {
155 if (descriptionMeta != null)
156 return descriptionMeta.Content;
157 return descriptionText;
161 if (descriptionMeta != null)
162 descriptionMeta.Content = value;
164 descriptionText = value;
168 public string Keywords {
170 if (keywordsMeta != null)
171 return keywordsMeta.Content;
176 if (keywordsMeta != null)
177 keywordsMeta.Content = value;
179 keywordsText = value;
184 public IStyleSheet StyleSheet {
186 if (styleSheet == null) styleSheet = new StyleSheetBag ();
191 public string Title {
207 internal class StyleSheetBag: IStyleSheet
209 ArrayList entries = new ArrayList ();
211 internal class StyleEntry
214 public string Selection;
215 public IUrlResolutionService UrlResolver;
218 public StyleSheetBag ()
222 public void CreateStyleRule (Style style, IUrlResolutionService urlResolver, string selection)
224 StyleEntry entry = new StyleEntry ();
226 entry.UrlResolver = urlResolver;
227 entry.Selection = selection;
231 public void RegisterStyle (Style style, IUrlResolutionService urlResolver)
233 for (int n=0; n<entries.Count; n++) {
234 if (((StyleEntry)entries[n]).Style == style)
238 string name = "aspnet_" + entries.Count;
239 style.SetRegisteredCssClass (name);
240 CreateStyleRule (style, urlResolver, "." + name);
243 public void Render (HtmlTextWriter writer)
245 writer.AddAttribute ("type", "text/css", false);
246 writer.RenderBeginTag (HtmlTextWriterTag.Style);
248 foreach (StyleEntry entry in entries) {
249 CssStyleCollection sts = entry.Style.GetStyleAttributes (entry.UrlResolver);
250 writer.Write ("\n" + entry.Selection + " {" + sts.Value + "}");
253 writer.RenderEndTag ();