/Main/src/DynamicDataDisplay/Common/Auxiliary/ValueStore.cs

  1using System;
  2using System.Collections.Generic;
  3using System.Linq;
  4using System.Text;
  5using System.ComponentModel;
  6using System.Diagnostics;
  7
  8namespace Microsoft.Research.DynamicDataDisplay
  9{
 10	public sealed class ValueStore : CustomTypeDescriptor, INotifyPropertyChanged
 11	{
 12		public ValueStore(params string[] propertiesNames)
 13		{
 14			foreach (var propertyName in propertiesNames)
 15			{
 16				this[propertyName] = "";
 17			}
 18		}
 19
 20		private Dictionary<string, object> cache = new Dictionary<string, object>();
 21
 22		public object this[string propertyName]
 23		{
 24			get { return cache[propertyName]; }
 25			set { SetValue(propertyName, value); }
 26		}
 27
 28		public ValueStore SetValue(string propertyName, object value)
 29		{
 30			cache[propertyName] = value;
 31			PropertyChanged.Raise(this, propertyName);
 32
 33			return this;
 34		}
 35
 36		private PropertyDescriptorCollection collection;
 37		public override PropertyDescriptorCollection GetProperties()
 38		{
 39			PropertyDescriptor[] propertyDescriptors = new PropertyDescriptor[cache.Count];
 40			var keys = cache.Keys.ToArray();
 41			for (int i = 0; i < keys.Length; i++)
 42			{
 43				propertyDescriptors[i] = new ValueStorePropertyDescriptor(keys[i]);
 44			}
 45
 46			collection = new PropertyDescriptorCollection(propertyDescriptors);
 47			return collection;
 48		}
 49
 50		private sealed class ValueStorePropertyDescriptor : PropertyDescriptor
 51		{
 52			private readonly string name;
 53
 54			public ValueStorePropertyDescriptor(string name)
 55				: base(name, null)
 56			{
 57				this.name = name;
 58			}
 59
 60			public override bool CanResetValue(object component)
 61			{
 62				return false;
 63			}
 64
 65			public override Type ComponentType
 66			{
 67				get { return typeof(ValueStore); }
 68			}
 69
 70			public override object GetValue(object component)
 71			{
 72				ValueStore store = (ValueStore)component;
 73				return store[name];
 74			}
 75
 76			public override bool IsReadOnly
 77			{
 78				get { return false; }
 79			}
 80
 81			public override Type PropertyType
 82			{
 83				get { return typeof(string); }
 84			}
 85
 86			public override void ResetValue(object component)
 87			{
 88			}
 89
 90			public override void SetValue(object component, object value)
 91			{
 92			}
 93
 94			public override bool ShouldSerializeValue(object component)
 95			{
 96				return false;
 97			}
 98		}
 99
100		#region INotifyPropertyChanged Members
101
102		public event PropertyChangedEventHandler PropertyChanged;
103
104		#endregion
105	}
106}