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                         // KLUDGE: the parser below should be rewritten
  77                         if (value [0] == sep)
  78                                 value = "0" + value;
  79
  80                         int count = value.Length;
  81                         int i = 0;
  82                         int sign = 1;
  83
  84                         while (i < count && Char.IsWhiteSpace (value [i]))
  85                                 i++;
  86                         if (value [i] == '-'){
  87                                 sign = -1;
  88                                 i++;
  89                                 if (!Char.IsDigit (value [i]))
  90                                         throw new ArgumentOutOfRangeException ("value");
  91                         } else if (!Char.IsDigit (value [i])) {
  92                                 throw new FormatException ();
  93                         }
  94
  95                         double dv = 0;
  96                         for (; i < count; i++){
  97                                 char c = value [i];
  98                                 if (!Char.IsDigit (c))
  99                                         break;
 100                                 dv = dv * 10 + ((int) c) - ((int) '0');
 101                         }
 102                         dv *= sign;
 103                         this.value = dv;
 104                         dv = 0;
 105                         if (i < count && value [i] == sep){
 106                                 i++;
 107                                 double factor = .1;
 108                                 for (; i < count; i++){
 109                                         char c = value [i];
 110                                         if (!Char.IsDigit (c))
 111                                                 break;
 112                                         dv = dv + (((int) c) - ((int) '0')) * factor;
 113                                         factor = factor *.1;
 114                                 }
 115                                 this.value += dv;
 116                         }
 117
 118                         while (i < count && Char.IsWhiteSpace (value [i]))
 119                                 i++;
 120
 121                         if (i == count){
 122                                 type = UnitType.Pixel;
 123                                 return;
 124                         }
 125
 126                         if (value [i] == '%'){
 127                                 type = UnitType.Percentage;
 128                                 i++;
 129                                 while (i < count && Char.IsWhiteSpace (value [i]))
 130                                         i++;
 131                                 if (i != count)
 132                                         throw new ArgumentOutOfRangeException ("value");
 133                                 return;
 134                         }
 135
 136                         int j = i;
 137                         while (j < count && Char.IsLetter (value [j]))
 138                                 j++;
 139                         string code = value.Substring (i, j-i);
 140                         switch (code.ToLower (CultureInfo.InvariantCulture)){
 141                         case "in": type = UnitType.Inch; break;
 142                         case "cm": type = UnitType.Cm; break;
 143                         case "mm": type = UnitType.Mm; break;
 144                         case "pt": type = UnitType.Point; break;
 145                         case "pc": type = UnitType.Pica; break;
 146                         case "em": type = UnitType.Em; break;
 147                         case "ex": type = UnitType.Ex; break;
 148                         case "px":
 149                                 type = UnitType.Pixel;
 150                                 if (dv != 0)
 151                                         throw new FormatException ("Pixel units do not allow floating point values");
 152                                 break;
 153                         default:
 154                                 throw new ArgumentOutOfRangeException ("value");
 155                         }
 156
 157                         while (j < count && Char.IsWhiteSpace (value [j]))
 158                                 j++;
 159                         if (j != count)
 160                                 throw new ArgumentOutOfRangeException ("value");
 161                 }
 162
 163
 164                 public Unit (string value) : this (value, '.')
 165                 {
 166                 }
 167
 168                 public Unit (string value, CultureInfo culture) : this (value, culture.NumberFormat.NumberDecimalSeparator [0])
 169                 {
 170                 }
 171
 172                 internal Unit (string value, CultureInfo culture, UnitType t) : this (value, '.')
 173                 {
 174                 }
 175
 176                 public bool IsEmpty {
 177                         get {
 178                                 return type == 0;
 179                         }
 180                 }
 181
 182                 public UnitType Type {
 183                         get {
 184                                 if (type == 0)
 185                                         return UnitType.Pixel;
 186                                 return type;
 187                         }
 188                 }
 189
 190                 public double Value {
 191                         get {
 192                                 return value;
 193                         }
 194                 }
 195
 196                 public static Unit Parse (string s)
 197                 {
 198                         return new Unit (s);
 199                 }
 200
 201                 public static System.Web.UI.WebControls.Unit Parse (string s, System.Globalization.CultureInfo culture)
 202                 {
 203                         return new Unit (s, culture);
 204                 }
 205
 206
 207                 public static Unit Percentage (double n)
 208                 {
 209                         return new Unit (n, UnitType.Percentage);
 210                 }
 211
 212                 public static Unit Pixel (int n)
 213                 {
 214                         return new Unit (n);
 215                 }
 216
 217                 public static Unit Point (int n)
 218                 {
 219                         return new Unit (n, UnitType.Point);
 220                 }
 221
 222                 public override bool Equals (object obj)
 223                 {
 224                         if (obj is Unit){
 225                                 Unit other = (Unit) obj;
 226                                 return (other.type == type && other.value == value);
 227                         }
 228                         return false;
 229                 }
 230
 231                 public override int GetHashCode ()
 232                 {
 233                         return Type.GetHashCode () ^ Value.GetHashCode ();
 234                 }
 235
 236                 public static bool operator == (Unit left, Unit right)
 237                 {
 238                         return left.Type == right.Type && left.Value == right.Value;
 239                 }
 240
 241                 public static bool operator != (Unit left, Unit right)
 242                 {
 243                         return left.Type != right.Type || left.Value != right.Value;
 244                 }
 245
 246                 public static implicit operator Unit (int n)
 247                 {
 248                         return new Unit (n);
 249                 }
 250
 251                 string GetExtension ()
 252                 {
 253                         switch (type){
 254                         case UnitType.Pixel: return "px";
 255                         case UnitType.Point: return "pt";
 256                         case UnitType.Pica: return "pc";
 257                         case UnitType.Inch: return "in";
 258                         case UnitType.Mm: return "mm";
 259                         case UnitType.Cm: return "cm";
 260                         case UnitType.Percentage: return "%";
 261                         case UnitType.Em: return "em";
 262                         case UnitType.Ex: return "ex";
 263                         default: return "";
 264                         }
 265                 }
 266
 267                 public string ToString (CultureInfo culture)
 268                 {
 269                         if (type == 0)
 270                                 return "";
 271
 272                         string ex = GetExtension ();
 273
 274                         return value.ToString (culture) + ex;
 275                 }
 276
 277                 public override string ToString ()
 278                 {
 279                         return ToString (CultureInfo.InvariantCulture);
 280                 }
 281
 282 #if NET_2_0
 283                 public string ToString (IFormatProvider provider)
 284                 {
 285                         if (type == 0)
 286                                 return "";
 287
 288                         string ex = GetExtension ();
 289
 290                         return value.ToString (provider) + ex;
 291                 }
 292 #endif
 293         }
 294
 295 }