mcs/class/System.Windows.Forms/System.Windows.Forms/OpacityConverter.cs

   1 // Permission is hereby granted, free of charge, to any person obtaining
   2 // a copy of this software and associated documentation files (the
   3 // "Software"), to deal in the Software without restriction, including
   4 // without limitation the rights to use, copy, modify, merge, publish,
   5 // distribute, sublicense, and/or sell copies of the Software, and to
   6 // permit persons to whom the Software is furnished to do so, subject to
   7 // the following conditions:
   8 //
   9 // The above copyright notice and this permission notice shall be
  10 // included in all copies or substantial portions of the Software.
  11 //
  12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  18 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  19 //
  20 // Copyright (c) 2005 Novell, Inc. (http://www.novell.com)
  21 //
  22 // Authors:
  23 //      Peter Bartok    (pbartok@novell.com)
  24 //
  25 //
  26
  27 // COMPLETE
  28
  29 using System;
  30 using System.Collections;
  31 using System.ComponentModel;
  32 using System.Globalization;
  33 using System.Text;
  34
  35 namespace System.Windows.Forms {
  36         public class OpacityConverter : TypeConverter {
  37                 #region Public Constructors
  38                 public OpacityConverter() {
  39                 }
  40                 #endregion      // Public Constructors
  41
  42                 #region Public Instance Methods
  43                 public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) {
  44                         if (sourceType == typeof(string)) {
  45                                 return true;
  46                         }
  47                         return false;
  48                 }
  49
  50                 public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value) {
  51                         if (value is string) {
  52                                 string  s;
  53
  54                                 s = (string)value;
  55                                 if (s.EndsWith("%")) {
  56                                         s = ((string)value).Substring(0, ((string)value).Length - 1);
  57                                 }
  58                                 return Double.Parse(s, NumberStyles.Any, culture) / 100;
  59                         }
  60                         return base.ConvertFrom (context, culture, value);
  61                 }
  62
  63                 public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType) {
  64                         if (destinationType == typeof(string)) {
  65                                 double  v;
  66
  67                                 v = ((double)value) * 100;
  68                                 return v.ToString() + "%";
  69                         }
  70                         return base.ConvertTo (context, culture, value, destinationType);
  71                 }
  72                 #endregion      // Public Instance Methods
  73         }
  74 }