File: DependencyObject.cs

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//
// DependencyObject.cs
//
// Author:
//   Iain McCoy (iain@mccoy.id.au)
//   Chris Toshok (toshok@ximian.com)
//
// (C) 2005 Iain McCoy
// (C) 2007 Novell, Inc.
//
// 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.Collections.Generic;
using System.Windows.Threading;

namespace System.Windows {
	public class DependencyObject : DispatcherObject {
		private static Dictionary<Type,Dictionary<string,DependencyProperty>> propertyDeclarations = new Dictionary<Type,Dictionary<string,DependencyProperty>>();
		private Dictionary<DependencyProperty,object> properties = new Dictionary<DependencyProperty,object>();

		[MonoTODO]
		public bool IsSealed {
			get { return false; }
		}

		public DependencyObjectType DependencyObjectType { 
			get { return DependencyObjectType.FromSystemType (GetType()); }
		}

		public void ClearValue(DependencyProperty dp)
		{
			if (IsSealed)
				throw new InvalidOperationException ("Cannot manipulate property values on a sealed DependencyObject");

			properties[dp] = null;
		}
		
		public void ClearValue(DependencyPropertyKey key)
		{
			ClearValue (key.DependencyProperty);
		}

		public void CoerceValue (DependencyProperty dp)
		{
			PropertyMetadata pm = dp.GetMetadata (this);
			if (pm.CoerceValueCallback != null)
				pm.CoerceValueCallback (this, GetValue (dp));
		}

		public sealed override bool Equals (object obj)
		{
			throw new NotImplementedException("Equals");
		}

		public sealed override int GetHashCode ()
		{
			throw new NotImplementedException("GetHashCode");
		}

		[MonoTODO]
		public LocalValueEnumerator GetLocalValueEnumerator()
		{
			return new LocalValueEnumerator(properties);
		}
		
		public object GetValue(DependencyProperty dp)
		{
			object val = properties.ContainsKey (dp) ? properties [dp] : null;
			return val == null ? dp.DefaultMetadata.DefaultValue : val;
		}
		
		[MonoTODO]
		public void InvalidateProperty(DependencyProperty dp)
		{
			throw new NotImplementedException("InvalidateProperty(DependencyProperty dp)");
		}
		
		protected virtual void OnPropertyChanged(DependencyPropertyChangedEventArgs e)
		{
			PropertyMetadata pm = e.Property.GetMetadata (this);
			if (pm.PropertyChangedCallback != null)
				pm.PropertyChangedCallback (this, e);
		}
		
		public object ReadLocalValue(DependencyProperty dp)
		{
			object val = properties.ContainsKey (dp) ? properties [dp] : null;
			return val == null ? DependencyProperty.UnsetValue : val;
		}
		
		public void SetValue(DependencyProperty dp, object value)
		{
			if (IsSealed)
				throw new InvalidOperationException ("Cannot manipulate property values on a sealed DependencyObject");

			if (!dp.IsValidType (value))
				throw new ArgumentException ("value not of the correct type for this DependencyProperty");

			ValidateValueCallback validate = dp.ValidateValueCallback;
			if (validate != null && !validate(value))
				throw new Exception("Value does not validate");
			else
				properties[dp] = value;
		}
		
		public void SetValue(DependencyPropertyKey key, object value)
		{
			SetValue (key.DependencyProperty, value);
		}

		protected virtual bool ShouldSerializeProperty (DependencyProperty dp)
		{
			throw new NotImplementedException ();
		}

		internal static void register(Type t, DependencyProperty dp)
		{
			if (!propertyDeclarations.ContainsKey (t))
				propertyDeclarations[t] = new Dictionary<string,DependencyProperty>();
			Dictionary<string,DependencyProperty> typeDeclarations = propertyDeclarations[t];
			if (!typeDeclarations.ContainsKey(dp.Name))
				typeDeclarations[dp.Name] = dp;
			else
				throw new ArgumentException("A property named " + dp.Name + " already exists on " + t.Name);
		}
	}
}