mcs/class/System.Web/System.Web.UI.WebControls/Unit.cs

   1 //
   2 // System.Web.UI.WebControls.Unit.cs
   3 //
   4 // Authors:
   5 //   Miguel de Icaza (miguel@novell.com)
   6 //   Ben Maurer (bmaurer@ximian.com).
   7 //
   8 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 using System.Globalization;
  31 using System.ComponentModel;
  32 using System.Security.Permissions;
  33
  34 namespace System.Web.UI.WebControls {
  35
  36         [TypeConverter(typeof (UnitConverter))]
  37 #if NET_2_0
  38         [Serializable]
  39 #else
  40         // CAS
  41         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  42 #endif
  43         public struct Unit {
  44                 UnitType type;
  45                 double value;
  46                 public static readonly Unit Empty;
  47
  48                 public Unit (double value, UnitType type)
  49                 {
  50                         if (value < -32768 || value > 32767)
  51                                 throw new ArgumentOutOfRangeException ("value");
  52
  53                         this.type = type;
  54                         if (type == UnitType.Pixel)
  55                                 this.value = (int) value;
  56                         else
  57                                 this.value = value;
  58                 }
  59
  60                 public Unit (double value) : this (value, UnitType.Pixel)
  61                 {
  62                 }
  63
  64                 public Unit (int value) : this ((double) value, UnitType.Pixel)
  65                 {
  66                 }
  67
  68                 internal Unit (string value, char sep)
  69                 {
  70                         if (value == null || value == String.Empty){
  71                                 type = (UnitType) 0;
  72                                 this.value = 0.0;
  73                                 return;
  74                         }
  75
  76                         int count = value.Length;
  77                         int i = 0;
  78                         int sign = 1;
  79
  80                         while (i < count && Char.IsWhiteSpace (value [i]))
  81                                 i++;
  82                         if (value [i] == '-'){
  83                                 sign = -1;
  84                                 i++;
  85                                 if (!Char.IsDigit (value [i]))
  86                                         throw new ArgumentOutOfRangeException ("value");
  87                         } else if (!Char.IsDigit (value [i])) {
  88                                 throw new FormatException ();
  89                         }
  90
  91                         double dv = 0;
  92                         for (; i < count; i++){
  93                                 char c = value [i];
  94                                 if (!Char.IsDigit (c))
  95                                         break;
  96                                 dv = dv * 10 + ((int) c) - ((int) '0');
  97                         }
  98                         dv *= sign;
  99                         this.value = dv;
 100                         dv = 0;
 101                         if (i < count && value [i] == sep){
 102                                 i++;
 103                                 double factor = .1;
 104                                 for (; i < count; i++){
 105                                         char c = value [i];
 106                                         if (!Char.IsDigit (c))
 107                                                 break;
 108                                         dv = dv + (((int) c) - ((int) '0')) * factor;
 109                                         factor = factor *.1;
 110                                 }
 111                                 this.value += dv;
 112                         }
 113
 114                         while (i < count && Char.IsWhiteSpace (value [i]))
 115                                 i++;
 116
 117                         if (i == count){
 118                                 type = UnitType.Pixel;
 119                                 return;
 120                         }
 121
 122                         if (value [i] == '%'){
 123                                 type = UnitType.Percentage;
 124                                 i++;
 125                                 while (i < count && Char.IsWhiteSpace (value [i]))
 126                                         i++;
 127                                 if (i != count)
 128                                         throw new ArgumentOutOfRangeException ("value");
 129                                 return;
 130                         }
 131
 132                         int j = i;
 133                         while (j < count && Char.IsLetter (value [j]))
 134                                 j++;
 135                         string code = value.Substring (i, j-i);
 136                         switch (code.ToLower (CultureInfo.InvariantCulture)){
 137                         case "in": type = UnitType.Inch; break;
 138                         case "cm": type = UnitType.Cm; break;
 139                         case "mm": type = UnitType.Mm; break;
 140                         case "pt": type = UnitType.Point; break;
 141                         case "pc": type = UnitType.Pica; break;
 142                         case "em": type = UnitType.Em; break;
 143                         case "ex": type = UnitType.Ex; break;
 144                         case "px":
 145                                 type = UnitType.Pixel;
 146                                 if (dv != 0)
 147                                         throw new FormatException ("Pixel units do not allow floating point values");
 148                                 break;
 149                         default:
 150                                 throw new ArgumentOutOfRangeException ("value");
 151                         }
 152
 153                         while (j < count && Char.IsWhiteSpace (value [j]))
 154                                 j++;
 155                         if (j != count)
 156                                 throw new ArgumentOutOfRangeException ("value");
 157                 }
 158
 159
 160                 public Unit (string value) : this (value, '.')
 161                 {
 162                 }
 163
 164                 public Unit (string value, CultureInfo culture) : this (value, culture.NumberFormat.NumberDecimalSeparator [0])
 165                 {
 166                 }
 167
 168                 internal Unit (string value, CultureInfo culture, UnitType t) : this (value, '.')
 169                 {
 170                 }
 171
 172                 public bool IsEmpty {
 173                         get {
 174                                 return type == 0;
 175                         }
 176                 }
 177
 178                 public UnitType Type {
 179                         get {
 180                                 if (type == 0)
 181                                         return UnitType.Pixel;
 182                                 return type;
 183                         }
 184                 }
 185
 186                 public double Value {
 187                         get {
 188                                 return value;
 189                         }
 190                 }
 191
 192                 public static Unit Parse (string s)
 193                 {
 194                         return new Unit (s);
 195                 }
 196
 197                 public static System.Web.UI.WebControls.Unit Parse (string s, System.Globalization.CultureInfo culture)
 198                 {
 199                         return new Unit (s, culture);
 200                 }
 201
 202
 203                 public static Unit Percentage (double n)
 204                 {
 205                         return new Unit (n, UnitType.Percentage);
 206                 }
 207
 208                 public static Unit Pixel (int n)
 209                 {
 210                         return new Unit (n);
 211                 }
 212
 213                 public static Unit Point (int n)
 214                 {
 215                         return new Unit (n, UnitType.Point);
 216                 }
 217
 218                 public override bool Equals (object obj)
 219                 {
 220                         if (obj is Unit){
 221                                 Unit other = (Unit) obj;
 222                                 return (other.type == type && other.value == value);
 223                         }
 224                         return false;
 225                 }
 226
 227                 public override int GetHashCode ()
 228                 {
 229                         return Type.GetHashCode () ^ Value.GetHashCode ();
 230                 }
 231
 232                 public static bool operator == (Unit left, Unit right)
 233                 {
 234                         return left.Type == right.Type && left.Value == right.Value;
 235                 }
 236
 237                 public static bool operator != (Unit left, Unit right)
 238                 {
 239                         return left.Type != right.Type || left.Value != right.Value;
 240                 }
 241
 242                 public static implicit operator Unit (int n)
 243                 {
 244                         return new Unit (n);
 245                 }
 246
 247                 string GetExtension ()
 248                 {
 249                         switch (type){
 250                         case UnitType.Pixel: return "px";
 251                         case UnitType.Point: return "pt";
 252                         case UnitType.Pica: return "pc";
 253                         case UnitType.Inch: return "in";
 254                         case UnitType.Mm: return "mm";
 255                         case UnitType.Cm: return "cm";
 256                         case UnitType.Percentage: return "%";
 257                         case UnitType.Em: return "em";
 258                         case UnitType.Ex: return "ex";
 259                         default: return "";
 260                         }
 261                 }
 262
 263                 public string ToString (CultureInfo culture)
 264                 {
 265                         if (type == 0)
 266                                 return "";
 267
 268                         string ex = GetExtension ();
 269
 270                         return String.Format (culture, "{0}{1}", value, ex);
 271                 }
 272
 273                 public override string ToString ()
 274                 {
 275                         return ToString (CultureInfo.InvariantCulture);
 276                 }
 277
 278 #if NET_2_0
 279                 public string ToString (IFormatProvider provider)
 280                 {
 281                         if (type == 0)
 282                                 return "";
 283
 284                         string ex = GetExtension ();
 285
 286                         return String.Format (provider, "{0}{1}", value, ex);
 287                 }
 288 #endif
 289         }
 290
 291 }