SizeConverter.cs :  » 2.6.4-mono-.net-core » System.Drawing » System » Drawing » C# / CSharp Open Source

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C# / CSharp Open Source » 2.6.4 mono .net core » System.Drawing 
System.Drawing » System » Drawing » SizeConverter.cs
//
// System.Drawing.SizeConverter.cs
//
// Authors:
//  Dennis Hayes (dennish@Raytek.com)
//  Gonzalo Paniagua Javier (gonzalo@ximian.com)
//  Ravindra (rkumar@novell.com)
//
// Copyright (C) 2002 Ximian, Inc. http://www.ximian.com
// Copyright (C) 2003,2004,2006,2008 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System.Collections;
using System.ComponentModel;
using System.Globalization;
using System.ComponentModel.Design.Serialization;
using System.Reflection;

namespace System.Drawing{

  public class SizeConverter : TypeConverter
  {
    public SizeConverter()
    {
    }

    public override bool CanConvertFrom (ITypeDescriptorContext context,
                 Type sourceType)
    {
      if (sourceType == typeof (string))
        return true;

      return base.CanConvertFrom (context, sourceType);
    }

    public override bool CanConvertTo (ITypeDescriptorContext context,
               Type destinationType)
    {
      if (destinationType == typeof (string))
        return true;

      if (destinationType == typeof (InstanceDescriptor))
        return true;

      return base.CanConvertTo (context, destinationType);
    }

    public override object ConvertFrom (ITypeDescriptorContext context,
                CultureInfo culture,
                object value)
    {
      if (culture == null)
        culture = CultureInfo.CurrentCulture;
      string s = value as string;
      if (s == null)
        return base.ConvertFrom (context, culture, value);

      string[] subs = s.Split (culture.TextInfo.ListSeparator.ToCharArray ());

      Int32Converter converter = new Int32Converter ();
      int[] numSubs = new int[subs.Length];
      for (int i = 0; i < numSubs.Length; i++) {
        numSubs[i] = (int) converter.ConvertFromString (context, culture, subs[i]);
      }

      if (subs.Length != 2)
        throw new ArgumentException ("Failed to parse Text(" + s + ") expected text in the format \"Width,Height.\"");

      return new Size (numSubs[0], numSubs[1]);
    }

    public override object ConvertTo (ITypeDescriptorContext context,
              CultureInfo culture,
              object value,
              Type destinationType)
    {
      if (culture == null)
        culture = CultureInfo.CurrentCulture;
      // LAMESPEC: "The default implementation calls the ToString method
      // of the object if the object is valid and if the destination
      // type is string." MS does not behave as per the specs.
      // Oh well, we have to be compatible with MS.
      if (value is Size) {
        Size size = (Size) value;
        if (destinationType == typeof (string)) {
          return size.Width.ToString (culture) + culture.TextInfo.ListSeparator 
            + " " + size.Height.ToString (culture);
        } else if (destinationType == typeof (InstanceDescriptor)) {
          ConstructorInfo ctor = typeof(Size).GetConstructor (new Type[] {typeof(int), typeof(int)});
          return new InstanceDescriptor (ctor, new object[] { size.Width, size.Height });
        }
      }
      
      return base.ConvertTo (context, culture, value, destinationType);
    }

    public override object CreateInstance (ITypeDescriptorContext context,
                   IDictionary propertyValues)
    {
#if NET_2_0
      object ow = propertyValues ["Width"];
      object oh = propertyValues ["Height"];
      if ((ow == null) || (oh == null))
        throw new ArgumentException ("propertyValues");

      int width = (int) ow;
      int height = (int) oh;
#else
      int width = (int) propertyValues ["Width"];
      int height = (int) propertyValues ["Height"];
#endif
      return new Size (width, height);
    }

    public override bool GetCreateInstanceSupported (ITypeDescriptorContext context)
    {
      return true;
    }

    public override PropertyDescriptorCollection GetProperties (
              ITypeDescriptorContext context,
              object value, Attribute[] attributes)
    {
      if (value is Size)
        return TypeDescriptor.GetProperties (value, attributes);

      return base.GetProperties (context, value, attributes);
    }
    
    public override bool GetPropertiesSupported (ITypeDescriptorContext context)
    {
      return true;
    }
  }
}
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