source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/DataSources/OneDimensional/EnumerableDataSourceBase.cs @ 13792

using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Diagnostics;
using System.Windows;

namespace Microsoft.Research.DynamicDataDisplay.DataSources
{
    /// <summary>Base class for all sources who receive data for charting 
    /// from any IEnumerable of T</summary>
    /// <typeparam name="T">Type of items in IEnumerable</typeparam>
  public abstract class EnumerableDataSourceBase<T> : IPointDataSource {
        private IEnumerable data;

    /// <summary>
    /// Gets or sets the data.
    /// </summary>
    /// <value>The data.</value>
        public IEnumerable Data {
      get { return data; }
      set {
        if (value == null)
          throw new ArgumentNullException("value");

        data = value;

        var observableCollection = data as INotifyCollectionChanged;
        if (observableCollection != null) {
          observableCollection.CollectionChanged += observableCollection_CollectionChanged;
        }
      }
    }

    protected EnumerableDataSourceBase(IEnumerable<T> data) : this((IEnumerable)data) { }

    protected EnumerableDataSourceBase(IEnumerable data) {
      if (data == null)
        throw new ArgumentNullException("data");
      Data = data;
    }

    private void observableCollection_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e) {
      RaiseDataChanged();
    }

    public event EventHandler DataChanged;
    public void RaiseDataChanged() {
      if (DataChanged != null) {
        DataChanged(this, EventArgs.Empty);
      }
    }

    public abstract IPointEnumerator GetEnumerator(DependencyObject context);
  }
}