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

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C# / CSharp Open Source » 2.6.4 mono .net core » System.Drawing 
System.Drawing » System » Drawing » Printing » MarginsConverter.cs
//
// System.Drawing.MarginsConverter.cs
//
// Author:
//   Dennis Hayes (dennish@Raytek.com)
//   Herve Poussineau (hpoussineau@fr.st)
//
// (C) 2002 Ximian, Inc
//

//
// Copyright (C) 2004 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;
using System.ComponentModel;
using System.Globalization;
using System.Text.RegularExpressions;
using System.ComponentModel.Design.Serialization;
using System.Reflection;

namespace System.Drawing.Printing{
  /// <summary>
  /// Summary description for MarginsConverter.
  /// </summary>
  public class MarginsConverter : ExpandableObjectConverter {
    public MarginsConverter() {
    }
    #region Methods
    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 (value is string)
      {
        if (value == null)
          return new Margins();
        
        // format [left];[right];[top];[bottom]
        string separator = @"( |\t)*";
        separator = separator + ";" + separator;
        string regex = @"(?<left>\d+)" + separator + @"(?<right>\d+)" + separator + @"(?<top>\d+)" + separator + @"(?<bottom>\d+)";
        
        Match match = new Regex(regex).Match(value as string);
        if (!match.Success)
          throw new ArgumentException("value");
        
        int left, right, top, bottom;
        try
        {
          left = int.Parse(match.Groups["left"].Value);
          right = int.Parse(match.Groups["right"].Value);
          top = int.Parse(match.Groups["top"].Value);
          bottom = int.Parse(match.Groups["bottom"].Value);
        }
        catch (Exception e)
        {
          throw new ArgumentException("value", e);
        }
        return new Margins(left, right, top, bottom);
      } else
        return base.ConvertFrom(context, culture, value);
    }
    
    public override object ConvertTo(ITypeDescriptorContext context,CultureInfo culture,object value,Type destinationType) {
      if (destinationType == typeof(string) && value is Margins)
      {
        Margins source = value as Margins;
        string ret = "{0}; {1}; {2}; {3}";
        return String.Format(ret, source.Left, source.Right, source.Top, source.Bottom);
      }
      if (destinationType == typeof (InstanceDescriptor) && value is Margins) {
        Margins c = (Margins) value;
        ConstructorInfo ctor = typeof(Margins).GetConstructor (new Type[] {typeof(int), typeof(int), typeof(int), typeof(int)} );
        return new InstanceDescriptor (ctor, new object[] {c.Left, c.Right, c.Top, c.Bottom});
      }

      return base.ConvertTo(context, culture, value, destinationType);
    }
    
    public override bool GetCreateInstanceSupported(ITypeDescriptorContext context)
    {
      return true;
    }
    
    public override object CreateInstance(ITypeDescriptorContext context, System.Collections.IDictionary propertyValues)
    {
      try
      {
        Margins margins = new Margins();
        margins.Left = int.Parse(propertyValues["Left"].ToString());
        margins.Right = int.Parse(propertyValues["Right"].ToString());
        margins.Top = int.Parse(propertyValues["Top"].ToString());
        margins.Bottom = int.Parse(propertyValues["Bottom"].ToString());
        return margins;
      }
      catch (Exception)
      {
        // in case of error, return null
        return null;
      }
    }
    #endregion
  }
}
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