//
// System.Web.UI.HtmlControls.HtmlHead
//
// Authors:
// Lluis Sanchez Gual (lluis@novell.com)
//
// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#if NET_2_0
using System.ComponentModel;
using System.Collections;
using System.Security.Permissions;
using System.Web.UI.WebControls;
namespace System.Web.UI.HtmlControls
{
// CAS - no InheritanceDemand here as the class is sealed
[AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
// attributes
[ControlBuilder (typeof(HtmlHeadBuilder))]
public sealed class HtmlHead: HtmlGenericControl, IParserAccessor {
string titleText;
HtmlTitle title;
Hashtable metadata;
ArrayList styleSheets;
StyleSheetBag styleSheet;
public HtmlHead(): base("head") {}
public HtmlHead (string tag) : base (tag)
{
}
protected internal override void OnInit (EventArgs e)
{
//You can only have one control on a page.
if(Page.Header!=null)
throw new HttpException ("You can only have one control on a page.");
Page.SetHeader (this);
}
protected internal override void RenderChildren (HtmlTextWriter writer)
{
EnsureTitleControl ();
base.RenderChildren (writer);
if (metadata != null) {
foreach (DictionaryEntry entry in metadata) {
writer.AddAttribute ("name", entry.Key.ToString ());
writer.AddAttribute ("content", entry.Value.ToString ());
writer.RenderBeginTag (HtmlTextWriterTag.Meta);
writer.RenderEndTag ();
}
}
if (styleSheet != null)
styleSheet.Render (writer);
}
protected internal override void AddedControl (Control control, int index)
{
//You can only have one element within the <head> element.
HtmlTitle t = control as HtmlTitle;
if (t != null) {
if (title != null)
throw new HttpException ("You can only have one <title> element within the <head> element.");
title = t;
}
base.AddedControl (control, index);
}
protected internal override void RemovedControl (Control control)
{
if (title == control)
title = null;
base.RemovedControl (control);
}
void EnsureTitleControl () {
if (title != null)
return;
HtmlTitle t = new HtmlTitle ();
t.Text = titleText;
Controls.Add (t);
}
IList LinkedStyleSheets {
get {
if (styleSheets == null) styleSheets = new ArrayList ();
return styleSheets;
}
}
IDictionary Metadata {
get {
if (metadata == null) metadata = new Hashtable ();
return metadata;
}
}
public IStyleSheet StyleSheet {
get {
if (styleSheet == null) styleSheet = new StyleSheetBag ();
return styleSheet;
}
}
public string Title {
get {
if (title != null)
return title.Text;
else
return titleText;
}
set {
if (title != null)
title.Text = value;
else
titleText = value;
}
}
}
internal class StyleSheetBag: IStyleSheet
{
ArrayList entries = new ArrayList ();
internal class StyleEntry
{
public Style Style;
public string Selection;
public IUrlResolutionService UrlResolver;
}
public StyleSheetBag ()
{
}
public void CreateStyleRule (Style style, IUrlResolutionService urlResolver, string selection)
{
StyleEntry entry = new StyleEntry ();
entry.Style = style;
entry.UrlResolver = urlResolver;
entry.Selection = selection;
entries.Add (entry);
}
public void RegisterStyle (Style style, IUrlResolutionService urlResolver)
{
for (int n=0; n<entries.Count; n++) {
if (((StyleEntry)entries[n]).Style == style)
return;
}
string name = "aspnet_" + entries.Count;
style.SetRegisteredCssClass (name);
CreateStyleRule (style, urlResolver, "." + name);
}
public void Render (HtmlTextWriter writer)
{
writer.AddAttribute ("type", "text/css");
writer.RenderBeginTag (HtmlTextWriterTag.Style);
foreach (StyleEntry entry in entries) {
CssStyleCollection sts = entry.Style.GetStyleAttributes (entry.UrlResolver);
writer.Write ("\n" + entry.Selection + " {" + sts.Value + "}");
}
writer.RenderEndTag ();
}
}
}
#endif