ProfilesArrayReadOnlyTypeConverter.cs :  » Development » devAdvantage » AnticipatingMinds » Genesis » KnowledgeManagement » KnowledgeBaseUI » C# / CSharp Open Source

using System;
using System.Text;
using System.ComponentModel;
using System.ComponentModel.Design;
using AnticipatingMinds.Genesis.KnowledgeManagement;

namespace AnticipatingMinds.Genesis.KnowledgeManagement.KnowledgeBaseUI{
  //This type converter is read only
  //it only shows string that enumerates all profiles it does not 
  //assign or edit the values
  //to edit values use [EditorAttribute(typeof(ProfilesArrayUIEditor),typeof(System.Drawing.Design.UITypeEditor))]
  //attribute
  public class ProfilesArrayReadOnlyTypeConverter : TypeConverter
  {
    public ProfilesArrayReadOnlyTypeConverter()
    {
    }
  
    public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
    {
      return false;
    }
  
    public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
    {
      if(destinationType != typeof(string))
        return false;

      if(!(context.Instance is Array))
        return false;

      if(context.Instance.GetType().GetElementType() != typeof(Profile))
        return false;
      
      return true;
    }
  
    public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)
    {
      if(destinationType == typeof(string) && value is Array)
      {
        Profile[] profiles = value as Profile[];
        if(profiles == null || profiles.Length == 0)
          return "(default)";

        StringBuilder profilesListBuilder = new StringBuilder(profiles[0].Name);
        for(int profileIndex = 1; profileIndex < profiles.Length; profileIndex++)
          profilesListBuilder.Append(", ").Append(profiles[profileIndex].Name);

        return profilesListBuilder.ToString();
      }
      
      return string.Empty;
    }
  }
}