mcs/class/System.Drawing/System.Drawing/FontConverter.cs

   1 //
   2 // System.Drawing.FontConverter.cs
   3 //
   4 // Authors:
   5 //      Dennis Hayes (dennish@Raytek.com)
   6 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   7 //      Ravindra (rkumar@novell.com)
   8 //
   9 // Copyright (C) 2002,2003 Ximian, Inc.  http://www.ximian.com
  10 //
  11 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System;
  34 using System.Text;
  35 using System.Collections;
  36 using System.ComponentModel;
  37 using System.Globalization;
  38 using System.Drawing.Text;
  39 using System.ComponentModel.Design.Serialization;\r
  40 using System.Reflection;\r
  41
  42 namespace System.Drawing
  43 {
  44         public class FontConverter : TypeConverter
  45         {
  46                 public FontConverter ()
  47                 {
  48                 }
  49
  50                 ~FontConverter ()
  51                 {
  52
  53                 }
  54
  55                 public override bool CanConvertFrom (ITypeDescriptorContext context, Type sourceType)
  56                 {
  57                         if (sourceType == typeof (string))
  58                                 return true;
  59
  60                         return base.CanConvertFrom (context, sourceType);
  61                 }
  62
  63                 public override bool CanConvertTo (ITypeDescriptorContext context, Type destinationType)
  64                 {
  65                         if (destinationType == typeof (String))
  66                                 return true;
  67
  68                         if (destinationType == typeof (InstanceDescriptor))
  69                                 return true;
  70
  71                         return base.CanConvertTo (context, destinationType);
  72                 }
  73
  74                 public override object ConvertTo (ITypeDescriptorContext context,
  75                         CultureInfo culture,
  76                         object value,
  77                         Type destinationType)
  78                 {
  79                         if ((destinationType == typeof (string)) && (value is Font)) {
  80                                 Font font = (Font) value;
  81                                 StringBuilder sb = new StringBuilder ();
  82                                 sb.Append (font.Name).Append (", ");
  83                                 sb.Append (font.Size);
  84
  85                                 switch (font.Unit) {
  86                                         // MS throws ArgumentException, if unit is set
  87                                         // to GraphicsUnit.Display
  88                                         // Don't know what to append for GraphicsUnit.Display
  89                                 case GraphicsUnit.Display:
  90                                         sb.Append ("display"); break;
  91
  92                                 case GraphicsUnit.Document:
  93                                         sb.Append ("doc"); break;
  94
  95                                 case GraphicsUnit.Point:
  96                                         sb.Append ("pt"); break;
  97
  98                                 case GraphicsUnit.Inch:
  99                                         sb.Append ("in"); break;
 100
 101                                 case GraphicsUnit.Millimeter:
 102                                         sb.Append ("mm"); break;
 103
 104                                 case GraphicsUnit.Pixel:
 105                                         sb.Append ("px"); break;
 106
 107                                 case GraphicsUnit.World:
 108                                         sb.Append ("world"); break;
 109                                 }
 110
 111                                 if (font.Style != FontStyle.Regular)
 112                                         sb.Append (", style=").Append (font.Style);
 113
 114                                 return sb.ToString ();
 115                         }
 116
 117                         if ((destinationType == typeof (InstanceDescriptor)) && (value is Font)) {
 118                                 Font font = (Font) value;
 119                                 ConstructorInfo met = typeof(Font).GetConstructor (new Type[] {typeof(string), typeof(float), typeof(FontStyle), typeof(GraphicsUnit)});\r
 120                                 object[] args = new object[4];
 121                                 args [0] = font.Name;
 122                                 args [1] = font.Size;
 123                                 args [2] = font.Style;\r
 124                                 args [3] = font.Unit;
 125                                 return new InstanceDescriptor (met, args);
 126                         }
 127
 128                         return base.ConvertTo (context, culture, value, destinationType);
 129                 }
 130
 131                 public override object ConvertFrom (ITypeDescriptorContext context, CultureInfo culture, object value)
 132                 {
 133                         string fontFamily = value as string;
 134                         if (fontFamily == null)
 135                                 return base.ConvertFrom (context, culture, value);
 136
 137                         // MS creates a font from the given family with
 138                         // emSize = 8.
 139                         return new Font (fontFamily, 8);
 140                 }
 141
 142                 public override object CreateInstance (ITypeDescriptorContext context, IDictionary propertyValues)
 143                 {
 144                         Object value;
 145                         byte charSet = 1;
 146                         float size = 8;
 147                         String name = null;
 148                         bool vertical = false;
 149                         FontStyle style = FontStyle.Regular;
 150                         FontFamily fontFamily = null;
 151                         GraphicsUnit unit = GraphicsUnit.Point;
 152
 153                         if ((value = propertyValues ["GdiCharSet"]) != null)
 154                                 charSet = (byte) value;
 155
 156                         if ((value = propertyValues ["Size"]) != null)
 157                                 size = (float) value;
 158
 159                         if ((value = propertyValues ["Unit"]) != null)
 160                                 unit = (GraphicsUnit) value;
 161
 162                         if ((value = propertyValues ["Name"]) != null)
 163                                 name = (String) value;
 164
 165                         if ((value = propertyValues ["GdiVerticalFont"]) != null)
 166                                 vertical = (bool) value;
 167
 168                         if ((value = propertyValues ["Bold"]) != null) {
 169                                 bool bold = (bool) value;
 170                                 if (bold == true)
 171                                         style |= FontStyle.Bold;
 172                         }
 173
 174                         if ((value = propertyValues ["Italic"]) != null) {
 175                                 bool italic = (bool) value;
 176                                 if (italic == true)
 177                                         style |= FontStyle.Italic;
 178                         }
 179
 180                         if ((value = propertyValues ["Strikeout"]) != null) {
 181                                 bool strike = (bool) value;
 182                                 if (strike == true)
 183                                         style |= FontStyle.Strikeout;
 184                         }
 185
 186                         if ((value = propertyValues ["Underline"]) != null) {
 187                                 bool underline = (bool) value;
 188                                 if (underline == true)
 189                                         style |= FontStyle.Underline;
 190                         }
 191
 192                         /* ?? Should default font be culture dependent ?? */
 193                         if (name == null)
 194                                 fontFamily = new FontFamily ("Tahoma");
 195                         else {
 196                                 name = name.ToLower ();
 197                                 FontCollection collection = new InstalledFontCollection ();
 198                                 FontFamily [] installedFontList = collection.Families;
 199                                 foreach (FontFamily font in installedFontList) {
 200                                         if (name == font.Name.ToLower ()) {
 201                                                 fontFamily = font;
 202                                                 break;
 203                                         }
 204                                 }
 205
 206                                 // font family not found in installed fonts
 207                                 if (fontFamily == null) {
 208                                         collection = new PrivateFontCollection ();
 209                                         FontFamily [] privateFontList = collection.Families;
 210                                         foreach (FontFamily font in privateFontList) {
 211                                                 if (name == font.Name.ToLower ()) {
 212                                                         fontFamily = font;
 213                                                         break;
 214                                                 }
 215                                         }
 216                                 }
 217
 218                                 // font family not found in private fonts also
 219                                 if (fontFamily == null)
 220                                         fontFamily = FontFamily.GenericSansSerif;
 221                         }
 222
 223                         return new Font (fontFamily, size, style, unit, charSet, vertical);
 224                 }
 225
 226                 public override bool GetCreateInstanceSupported (ITypeDescriptorContext context)
 227                 {
 228                         return true;
 229                 }
 230
 231                 public override PropertyDescriptorCollection GetProperties
 232                         (ITypeDescriptorContext context,
 233                         object value, Attribute [] attributes)
 234                 {
 235                         if (value is Font)
 236                                 return TypeDescriptor.GetProperties (value, attributes);
 237
 238                         return base.GetProperties (context, value, attributes);
 239                 }
 240
 241                 public override bool GetPropertiesSupported (ITypeDescriptorContext context)
 242                 {
 243                         return true;
 244                 }
 245
 246                 public sealed class FontNameConverter : TypeConverter
 247 #if NET_2_0
 248                 , IDisposable
 249 #endif
 250                 {
 251                         FontFamily [] fonts;
 252
 253                         public FontNameConverter ()
 254                         {
 255                                 fonts = FontFamily.Families;
 256                         }
 257 #if NET_2_0
 258                         void IDisposable.Dispose ()
 259                         {
 260                         }
 261 #endif
 262                         public override bool CanConvertFrom (ITypeDescriptorContext context, Type sourceType)
 263                         {
 264                                 if (sourceType == typeof (string))
 265                                         return true;
 266
 267                                 return base.CanConvertFrom (context, sourceType);
 268                         }
 269
 270                         public override object ConvertFrom (ITypeDescriptorContext context, CultureInfo culture, object value)
 271                         {
 272                                 if (value is string)
 273                                         return value;
 274                                 return base.ConvertFrom (context, culture, value);
 275                         }
 276
 277                         public override StandardValuesCollection GetStandardValues (ITypeDescriptorContext context)
 278                         {
 279                                 string [] values = new string [fonts.Length];
 280                                 for (int i = fonts.Length; i > 0;){
 281                                         i--;
 282                                         values [i] = fonts [i].Name;
 283                                 }
 284
 285                                 return new TypeConverter.StandardValuesCollection (values);
 286                         }
 287
 288                         public override bool GetStandardValuesExclusive (ITypeDescriptorContext context)
 289                         {
 290                                 // We allow other values other than those in the font list.
 291                                 return false;
 292                         }
 293
 294                         public override bool GetStandardValuesSupported (ITypeDescriptorContext context)
 295                         {
 296                                 // Yes, we support picking an element from the list.
 297                                 return true;
 298                         }
 299                 }
 300
 301                 public class FontUnitConverter : EnumConverter
 302                 {
 303                         public FontUnitConverter () : base (typeof (GraphicsUnit)) {}
 304
 305                         public override StandardValuesCollection GetStandardValues (ITypeDescriptorContext context)
 306                         {
 307                                 return base.GetStandardValues (context);
 308                         }
 309
 310                 }
 311         }
 312 }