source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/Common/Auxiliary/NotifyCollectionChangedEventArgsExtensions.cs @ 12503

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections.Specialized;
using Microsoft.Research.DynamicDataDisplay.Charts;

namespace Microsoft.Research.DynamicDataDisplay.Common.Auxiliary
{
  public static class NotifyCollectionChangedEventArgsExtensions
  {
    public static int GetLastAddedIndex(this NotifyCollectionChangedEventArgs args)
    {
      if (args.NewItems == null)
        throw new InvalidOperationException("Cannot get last added index when NewItems are null.");

      int lastIndex = args.NewStartingIndex + args.NewItems.Count;

      return lastIndex;
    }

    public static Range<int> GetAddedRange(this NotifyCollectionChangedEventArgs args)
    {
      int lastIndex = GetLastAddedIndex(args);

      return new Range<int>(args.NewStartingIndex, lastIndex);
    }
  }
}