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 using System.Collections.Specialized;
  36 using System.Globalization;
  37
  38 namespace System.Web.UI {
  39
  40         // CAS - no InheritanceDemand here as the class is sealed
  41         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  42         public sealed class CssStyleCollection
  43         {
  44                 StateBag bag;
  45                 HybridDictionary style;
  46                 string _value;
  47
  48                 string ValueInternal {
  49                         get { return _value; }
  50                         set {
  51                                 _value = value;
  52                                 if (bag != null) {
  53                                         if (_value == null) {
  54                                                 bag.Remove (AttributeCollection.StyleAttribute);
  55                                         }
  56                                         else {
  57                                                 bag [AttributeCollection.StyleAttribute] = _value;
  58                                         }
  59                                 }
  60                         }
  61                 }
  62
  63                 internal CssStyleCollection ()
  64                 {
  65 #if NET_2_0
  66                         style = new HybridDictionary (true);
  67 #else
  68                         style = new HybridDictionary (false);
  69 #endif
  70                 }
  71
  72                 internal CssStyleCollection (StateBag bag)
  73                         : this ()
  74                 {
  75                         this.bag = bag;
  76                         if (bag != null)
  77                                 _value = (string) bag [AttributeCollection.StyleAttribute];
  78                         InitFromStyle ();
  79                 }
  80
  81                 void InitFromStyle ()
  82                 {
  83                         style.Clear ();
  84                         if (_value != null) {
  85                                 FillStyle (_value);
  86                         }
  87                 }
  88
  89                 void FillStyle (string s)
  90                 {
  91                         int mark = s.IndexOf (':');
  92                         if (mark == -1)
  93                                 return;
  94                         string key = s.Substring (0, mark). Trim ();
  95                         if (mark + 1 > s.Length)
  96                                 return;
  97
  98                         string fullValue = s.Substring (mark + 1);
  99                         if (fullValue == "")
 100                                 return;
 101
 102                         mark = fullValue.IndexOf (';');
 103                         string value;
 104                         if (mark == -1)
 105                                 value = fullValue.Trim ();
 106                         else
 107                                 value = fullValue.Substring (0, mark).Trim ();
 108
 109                         style.Add (key, value);
 110                         if (mark + 1 > fullValue.Length)
 111                                 return;
 112                         FillStyle (fullValue.Substring (mark + 1));
 113                 }
 114
 115                 string BagToString ()
 116                 {
 117                         StringBuilder sb = new StringBuilder ();
 118                         foreach (string key in style.Keys) {
 119                                 if (key == "background-image" && 0 != String.Compare ("url", ((string) style [key]).Substring (0, 3), true, CultureInfo.InvariantCulture))
 120                                         sb.AppendFormat ("{0}:url({1});", key, HttpUtility.UrlPathEncode ((string) style [key]));
 121                                 else
 122                                         sb.AppendFormat ("{0}:{1};", key, style [key]);
 123                         }
 124
 125                         return sb.ToString ();
 126                 }
 127
 128                 public int Count {
 129                         get {
 130                                 return style.Count;
 131                         }
 132                 }
 133
 134                 public string this [string key] {
 135                         get {
 136                                 return style [key] as string;
 137                         }
 138
 139                         set {
 140                                 Add (key, value);
 141                         }
 142                 }
 143
 144                 public ICollection Keys {
 145                         get {
 146                                 return style.Keys;
 147                         }
 148                 }
 149
 150                 public void Add (string key, string value)
 151                 {
 152                         style [key] = value;
 153                         ValueInternal = BagToString ();
 154                 }
 155
 156 #if NET_2_0
 157                 public
 158 #else
 159                 internal
 160 #endif
 161                 void Add (HtmlTextWriterStyle key, string value)
 162                 {
 163                         Add (HtmlTextWriter.StaticGetStyleName (key), value);
 164                 }
 165
 166                 public void Clear ()
 167                 {
 168                         style.Clear ();
 169                         ValueInternal = null;
 170                 }
 171
 172                 public void Remove (string key)
 173                 {
 174                         if (style [key] == null)
 175                                 return;
 176                         style.Remove (key);
 177                         if (style.Count == 0)
 178                                 ValueInternal = null;
 179                         else
 180                                 ValueInternal = BagToString ();
 181                 }
 182 #if NET_2_0
 183                 public string this [HtmlTextWriterStyle key] {
 184                         get {
 185                                 return style [HtmlTextWriter.StaticGetStyleName (key)] as string;
 186                         }
 187                         set {
 188                                 Add (HtmlTextWriter.StaticGetStyleName (key), value);
 189                         }
 190                 }
 191
 192                 public void Remove (HtmlTextWriterStyle key)
 193                 {
 194                         Remove (HtmlTextWriter.StaticGetStyleName (key));
 195                 }
 196
 197                 public
 198 #else
 199                 internal
 200 #endif
 201                 string Value {
 202                         get { return ValueInternal; }
 203                         set {
 204                                 ValueInternal = value;
 205                                 InitFromStyle ();
 206                         }
 207                 }
 208         }
 209 }
 210