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