232 lines
6.3 KiB
C#
232 lines
6.3 KiB
C#
//
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// System.Web.UI.HtmlControls.HtmlHead
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//
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// Authors:
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// Lluis Sanchez Gual (lluis@novell.com)
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//
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// Copyright (C) 2004-2010 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.ComponentModel;
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using System.Collections;
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using System.Security.Permissions;
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using System.Web.UI.WebControls;
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namespace System.Web.UI.HtmlControls
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{
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// CAS - no InheritanceDemand here as the class is sealed
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[AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
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// attributes
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[ControlBuilder (typeof(HtmlHeadBuilder))]
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public sealed class HtmlHead: HtmlGenericControl, IParserAccessor
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{
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string descriptionText;
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string keywordsText;
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HtmlMeta descriptionMeta;
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HtmlMeta keywordsMeta;
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string titleText;
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HtmlTitle title;
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//Hashtable metadata;
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StyleSheetBag styleSheet;
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public HtmlHead(): base("head") {}
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public HtmlHead (string tag) : base (tag)
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{
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}
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protected internal override void OnInit (EventArgs e)
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{
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base.OnInit (e);
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Page page = Page;
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if (page == null)
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throw new HttpException ("The <head runat=\"server\"> control requires a page.");
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//You can only have one <head runat="server"> control on a page.
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if(page.Header != null)
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throw new HttpException ("You can only have one <head runat=\"server\"> control on a page.");
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page.SetHeader (this);
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}
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protected internal override void RenderChildren (HtmlTextWriter writer)
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{
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base.RenderChildren (writer);
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if (title == null) {
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writer.RenderBeginTag (HtmlTextWriterTag.Title);
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if (!String.IsNullOrEmpty (titleText))
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writer.Write (titleText);
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writer.RenderEndTag ();
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}
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if (descriptionMeta == null && descriptionText != null) {
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writer.AddAttribute ("name", "description");
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writer.AddAttribute ("content", HttpUtility.HtmlAttributeEncode (descriptionText));
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writer.RenderBeginTag (HtmlTextWriterTag.Meta);
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writer.RenderEndTag ();
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}
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if (keywordsMeta == null && keywordsText != null) {
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writer.AddAttribute ("name", "keywords");
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writer.AddAttribute ("content", HttpUtility.HtmlAttributeEncode (keywordsText));
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writer.RenderBeginTag (HtmlTextWriterTag.Meta);
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writer.RenderEndTag ();
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}
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if (styleSheet != null)
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styleSheet.Render (writer);
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}
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protected internal override void AddedControl (Control control, int index)
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{
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//You can only have one <title> element within the <head> element.
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HtmlTitle t = control as HtmlTitle;
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if (t != null) {
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if (title != null)
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throw new HttpException ("You can only have one <title> element within the <head> element.");
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title = t;
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}
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HtmlMeta meta = control as HtmlMeta;
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if (meta != null) {
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if (String.Compare ("keywords", meta.Name, StringComparison.OrdinalIgnoreCase) == 0)
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keywordsMeta = meta;
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else if (String.Compare ("description", meta.Name, StringComparison.OrdinalIgnoreCase) == 0)
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descriptionMeta = meta;
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}
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base.AddedControl (control, index);
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}
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protected internal override void RemovedControl (Control control)
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{
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if (title == control)
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title = null;
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if (keywordsMeta == control)
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keywordsMeta = null;
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else if (descriptionMeta == control)
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descriptionMeta = null;
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base.RemovedControl (control);
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}
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public string Description {
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get {
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if (descriptionMeta != null)
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return descriptionMeta.Content;
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return descriptionText;
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}
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set {
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if (descriptionMeta != null)
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descriptionMeta.Content = value;
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else
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descriptionText = value;
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}
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}
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public string Keywords {
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get {
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if (keywordsMeta != null)
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return keywordsMeta.Content;
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return keywordsText;
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}
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set {
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if (keywordsMeta != null)
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keywordsMeta.Content = value;
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else
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keywordsText = value;
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}
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}
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public IStyleSheet StyleSheet {
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get {
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if (styleSheet == null) styleSheet = new StyleSheetBag ();
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return styleSheet;
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}
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}
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public string Title {
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get {
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if (title != null)
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return title.Text;
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else
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return titleText;
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}
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set {
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if (title != null)
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title.Text = value;
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else
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titleText = value;
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}
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}
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}
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internal class StyleSheetBag: IStyleSheet
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{
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ArrayList entries = new ArrayList ();
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internal class StyleEntry
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{
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public Style Style;
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public string Selection;
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public IUrlResolutionService UrlResolver;
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}
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public StyleSheetBag ()
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{
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}
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public void CreateStyleRule (Style style, IUrlResolutionService urlResolver, string selection)
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{
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StyleEntry entry = new StyleEntry ();
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entry.Style = style;
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entry.UrlResolver = urlResolver;
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entry.Selection = selection;
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entries.Add (entry);
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}
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public void RegisterStyle (Style style, IUrlResolutionService urlResolver)
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{
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for (int n=0; n<entries.Count; n++) {
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if (((StyleEntry)entries[n]).Style == style)
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return;
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}
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string name = "aspnet_" + entries.Count;
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style.SetRegisteredCssClass (name);
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CreateStyleRule (style, urlResolver, "." + name);
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}
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public void Render (HtmlTextWriter writer)
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{
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writer.AddAttribute ("type", "text/css", false);
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writer.RenderBeginTag (HtmlTextWriterTag.Style);
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foreach (StyleEntry entry in entries) {
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CssStyleCollection sts = entry.Style.GetStyleAttributes (entry.UrlResolver);
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writer.Write ("\n" + entry.Selection + " {" + sts.Value + "}");
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}
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writer.RenderEndTag ();
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}
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}
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}
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