mcs/class/System.Web/System.Web.UI/CssStyleCollection.cs

   1 //
   2 // System.Web.UI.CssStyleCollection.cs
   3 //
   4 // Authors:
   5 //      Duncan Mak  (duncan@ximian.com)
   6 //      Gonzalo Paniagua (gonzalo@ximian.com)
   7 //
   8 // (C) 2002 Ximian, Inc. (http://www.ximian.com)
   9 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System.IO;
  32 using System.Collections;
  33 using System.Security.Permissions;
  34 using System.Text;
  35
  36 namespace System.Web.UI {
  37
  38         // CAS - no InheritanceDemand here as the class is sealed
  39         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  40         public sealed class CssStyleCollection
  41         {
  42                 StateBag bag;
  43                 StateBag style;
  44                 string last_string;
  45
  46                 internal CssStyleCollection (StateBag bag)
  47                 {
  48                         this.bag = bag;
  49                         if (bag != null) {
  50                                 last_string = (string) bag ["style"];
  51                                 style = new StateBag ();
  52                                 if (last_string != null)
  53                                         FillStyle (last_string);
  54                         }
  55                 }
  56
  57                 void FillStyle (string s)
  58                 {
  59                         int mark = s.IndexOf (':');
  60                         if (mark == -1)
  61                                 return;
  62                         string key = s.Substring (0, mark). Trim ();
  63                         if (mark + 1 > s.Length)
  64                                 return;
  65
  66                         string fullValue = s.Substring (mark + 1);
  67                         if (fullValue == "")
  68                                 return;
  69
  70                         mark = fullValue.IndexOf (';');
  71                         string value;
  72                         if (mark == -1)
  73                                 value = fullValue.Trim ();
  74                         else
  75                                 value = fullValue.Substring (0, mark).Trim ();
  76
  77                         style.Add (key, value);
  78                         if (mark + 1 > fullValue.Length)
  79                                 return;
  80                         FillStyle (fullValue.Substring (mark + 1));
  81                 }
  82
  83                 string BagToString ()
  84                 {
  85                         if (last_string != null)
  86                                 return last_string;
  87
  88                         StringBuilder sb = new StringBuilder ();
  89                         foreach (string key in Keys) {
  90                                 if (key == "background-image")
  91                                         sb.AppendFormat ("{0}:url({1});", key, HttpUtility.UrlPathEncode ((string) style [key]));
  92                                 else
  93                                         sb.AppendFormat ("{0}:{1};", key, style [key]);
  94                         }
  95
  96                         last_string = sb.ToString ();
  97                         return last_string;
  98                 }
  99
 100                 public int Count
 101                 {
 102                         get {
 103                                 if (bag == null)
 104                                         throw new NullReferenceException ();
 105                                 return style.Count;
 106                         }
 107                 }
 108
 109                 public string this [string key] {
 110                         get {
 111                                 return style [key] as string;
 112                         }
 113
 114                         set {
 115                                 Add (key, value);
 116                         }
 117                 }
 118
 119                 public ICollection Keys {
 120                         get { return style.Keys; }
 121                 }
 122
 123                 public void Add (string key, string value)
 124                 {
 125                         if (style == null)
 126                                 style = new StateBag ();
 127                         style [key] = value;
 128                         last_string = null;
 129                         bag ["style"] = BagToString ();
 130                 }
 131
 132 #if NET_2_0
 133                 public
 134 #else
 135                 internal
 136 #endif
 137                 void Add (HtmlTextWriterStyle key, string value)
 138                 {
 139                         Add (HtmlTextWriter.StaticGetStyleName (key), value);
 140                 }
 141
 142                 public void Clear ()
 143                 {
 144                         if (style != null)
 145                                 style.Clear ();
 146                         last_string = null;
 147                         bag.Remove ("style");
 148                 }
 149
 150                 public void Remove (string key)
 151                 {
 152                         if (style != null)
 153                                 style.Remove (key);
 154                         last_string = null;
 155                         bag ["style"] = BagToString ();
 156                 }
 157 #if NET_2_0
 158                 public string this [HtmlTextWriterStyle key] {
 159                         get {
 160                                 return style [HtmlTextWriter.StaticGetStyleName (key)] as string;
 161                         }
 162                         set {
 163                                 Add (HtmlTextWriter.StaticGetStyleName (key), value);
 164                         }
 165                 }
 166
 167                 public void Remove (HtmlTextWriterStyle key)
 168                 {
 169                         Remove (HtmlTextWriter.StaticGetStyleName (key));
 170                 }
 171
 172                 public
 173 #else
 174                 internal
 175 #endif
 176                 string Value {
 177                         get { return BagToString (); }
 178                         set {
 179                                 if (style != null)
 180                                         style = new StateBag ();
 181                                 style.Clear ();
 182                                 last_string = value;
 183                                 bag ["style"] = value;
 184                                 if (value != null)
 185                                         FillStyle (value);
 186                         }
 187                 }
 188         }
 189 }
 190