mcs/class/System.Web/System.Web.UI.HtmlControls/HtmlHead.cs

   1 //\r
   2 // System.Web.UI.HtmlControls.HtmlHead\r
   3 //\r
   4 // Authors:\r
   5 //      Lluis Sanchez Gual (lluis@novell.com)\r
   6 //\r
   7 // (C) 2004 Novell, Inc.\r
   8 \r
   9 //\r
  10 // Permission is hereby granted, free of charge, to any person obtaining\r
  11 // a copy of this software and associated documentation files (the\r
  12 // "Software"), to deal in the Software without restriction, including\r
  13 // without limitation the rights to use, copy, modify, merge, publish,\r
  14 // distribute, sublicense, and/or sell copies of the Software, and to\r
  15 // permit persons to whom the Software is furnished to do so, subject to\r
  16 // the following conditions:\r
  17 // \r
  18 // The above copyright notice and this permission notice shall be\r
  19 // included in all copies or substantial portions of the Software.\r
  20 // \r
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,\r
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\r
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND\r
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE\r
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION\r
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION\r
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\r
  28 //\r
  29 \r
  30 #if NET_2_0\r
  31 \r
  32 using System;\r
  33 using System.ComponentModel;\r
  34 using System.Web;\r
  35 using System.Web.UI;\r
  36 using System.Web.UI.WebControls;\r
  37 using System.Collections;\r
  38 \r
  39 namespace System.Web.UI.HtmlControls\r
  40 {\r
  41         [ControlBuilder (typeof(HtmlHeadBuilder))]\r
  42         public class HtmlHead: HtmlContainerControl, IPageHeader\r
  43         {\r
  44                 HtmlTitle title;\r
  45                 Hashtable metadata;\r
  46                 ArrayList styleSheets;\r
  47                 StyleSheetBag styleSheet;\r
  48                 \r
  49                 public HtmlHead(): base("head") {}\r
  50 \r
  51                 protected override void OnInit (EventArgs e)\r
  52                 {\r
  53                         Page.SetHeader (this);\r
  54                 }\r
  55                 \r
  56                 protected override void RenderChildren (HtmlTextWriter writer)\r
  57                 {\r
  58                         base.RenderChildren (writer);\r
  59                         if (metadata != null) {\r
  60                                 foreach (DictionaryEntry entry in metadata) {\r
  61                                         writer.AddAttribute ("name", entry.Key.ToString ());\r
  62                                         writer.AddAttribute ("content", entry.Value.ToString ());\r
  63                                         writer.RenderBeginTag (HtmlTextWriterTag.Meta);\r
  64                                         writer.RenderEndTag ();\r
  65                                 }\r
  66                         }\r
  67                         \r
  68                         if (styleSheet != null)\r
  69                                 styleSheet.Render (writer);\r
  70                 }\r
  71                 \r
  72                 protected override void AddParsedSubObject (object ob)\r
  73                 {\r
  74                         if (ob is HtmlTitle)\r
  75                                 title = (HtmlTitle) ob;\r
  76                         \r
  77                         base.AddParsedSubObject (ob);\r
  78                 }\r
  79                 \r
  80                 protected internal override void AddedControl (Control control, int index)\r
  81                 {\r
  82                         base.AddedControl (control, index);\r
  83                 }\r
  84                 \r
  85                 IList IPageHeader.LinkedStyleSheets {\r
  86                         get {\r
  87                                 if (styleSheets == null) styleSheets = new ArrayList ();\r
  88                                 return styleSheets;\r
  89                         }\r
  90                 } \r
  91                 \r
  92                 IDictionary IPageHeader.Metadata {\r
  93                         get {\r
  94                                 if (metadata == null) metadata = new Hashtable ();\r
  95                                 return metadata;\r
  96                         }\r
  97                 }\r
  98                 \r
  99                 IStyleSheet IPageHeader.StyleSheet {\r
 100                         get {\r
 101                                 if (styleSheet == null) styleSheet = new StyleSheetBag (Page);\r
 102                                 return styleSheet;\r
 103                         }\r
 104                 }\r
 105                 \r
 106                 string IPageHeader.Title {\r
 107                         get { return title.Text; }\r
 108                         set { title.Text = value; }\r
 109                 }\r
 110         }\r
 111         \r
 112         internal class StyleSheetBag: IStyleSheet\r
 113         {\r
 114                 ArrayList entries = new ArrayList ();\r
 115                 Page page;\r
 116                 \r
 117                 internal class StyleEntry\r
 118                 {\r
 119                         public Style Style;\r
 120                         public string Selection;\r
 121                         public IUrlResolutionService UrlResolver;\r
 122                 }\r
 123                 \r
 124                 public StyleSheetBag (Page page)\r
 125                 {\r
 126                         this.page = page;\r
 127                 }\r
 128                 \r
 129                 public void CreateStyleRule (Style style, string selection, IUrlResolutionService urlResolver)\r
 130                 {\r
 131                         StyleEntry entry = new StyleEntry ();\r
 132                         entry.Style = style;\r
 133                         entry.UrlResolver = urlResolver;\r
 134                         entry.Selection = selection;\r
 135                         entries.Add (entry);\r
 136                 }\r
 137                 \r
 138                 public void RegisterStyle (Style style, IUrlResolutionService urlResolver)\r
 139                 {\r
 140                         for (int n=0; n<entries.Count; n++) {\r
 141                                 if (((StyleEntry)entries[n]).Style == style)\r
 142                                         return;\r
 143                         }\r
 144                         \r
 145                         string name = "aspnet_" + entries.Count;\r
 146                         style.SetRegisteredCssClass (name);\r
 147                         CreateStyleRule (style, "." + name, urlResolver);\r
 148                 }\r
 149                 \r
 150                 public void Render (HtmlTextWriter writer)\r
 151                 {\r
 152                         writer.AddAttribute ("type", "text/css");\r
 153                         writer.RenderBeginTag (HtmlTextWriterTag.Style);\r
 154 \r
 155                         foreach (StyleEntry entry in entries) {\r
 156                                 CssStyleCollection sts = entry.Style.GetStyleAttributes (entry.UrlResolver);\r
 157                                 writer.Write ("\n" + entry.Selection + " {" + sts.BagToString () + "}");\r
 158                         }\r
 159 \r
 160                         writer.RenderEndTag ();\r
 161                 }\r
 162         }\r
 163 }\r
 164 \r
 165 #endif\r