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