--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Chronosv2/source/Presentation/ViewModel/ClosableViewModel.cs	Tue Feb 21 17:25:44 2012 +0700
@@ -0,0 +1,207 @@
+/*
+The MIT License
+
+Copyright (c) 2009-2010. Carlos Guzmán Álvarez. http://chronoswpf.codeplex.com/
+
+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;
+using System.Collections.Generic;
+using System.ComponentModel;
+using Chronos.Presentation.Core.ViewModel;
+using Chronos.Presentation.Core.VirtualDesktops;
+using NLog;
+using nRoute.Components;
+using nRoute.Components.Messaging;
+
+namespace Chronos.Presentation.ViewModel
+{
+    /// <summary>
+    /// Base class for closeable view models
+    /// </summary>
+    public abstract class ClosableViewModel 
+        : ViewModelBase, IClosableViewModel
+    {
+        #region · NotifyPropertyChanged Cached Instances ·
+
+        private static readonly PropertyChangedEventArgs IdChangedArgs      = CreateArgs<ClosableViewModel>(x => x.Id);
+        private static readonly PropertyChangedEventArgs TitleChangedArgs   = CreateArgs<ClosableViewModel>(x => x.Title);
+
+        #endregion
+
+        #region · Logger ·
+
+        private static Logger Logger = LogManager.GetCurrentClassLogger();
+
+        #endregion
+
+        #region · Fields ·
+
+        private Guid                    id;
+        private ActionCommand           closeCommand;
+        private string                  title;
+        private List<IChannelObserver>  observers;
+
+        #endregion
+
+        #region · Commands ·
+
+        /// <summary>
+        /// Gets the Close Command
+        /// </summary>
+        public ActionCommand CloseCommand
+        {
+            get
+            {
+                if (this.closeCommand == null)
+                {
+                    this.closeCommand = new ActionCommand
+                    (
+                        () => Close(),
+                        () => CanClose()
+                    );
+                }
+
+                return this.closeCommand;
+            }
+        }
+
+        #endregion
+
+        #region · Properties ·
+
+        /// <summary>
+        /// Gets or sets the unique identifier.
+        /// </summary>
+        /// <value>The id.</value>
+        public Guid Id
+        {
+            get { return this.id; }
+            set
+            {
+                if (this.id != value)
+                {
+                    this.id = value;
+                    this.NotifyPropertyChanged(IdChangedArgs);
+                }
+            }
+        }
+
+        /// <summary>
+        /// Returns the user-friendly name of this object.
+        /// Child classes can set this property to a new value,
+        /// or override it to determine the value on-demand.
+        /// </summary>
+        public virtual string Title
+        {
+            get { return this.title; }
+            set
+            {
+                if (this.title != value)
+                {
+                    this.title = value;
+                    this.NotifyPropertyChanged(TitleChangedArgs);
+                }
+            }
+        }
+
+        #endregion
+
+        #region · Constructors ·
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ClosableViewModel"/> class.
+        /// </summary>
+        protected ClosableViewModel()
+            : base()
+        {
+            this.Id         = Guid.NewGuid();
+            this.observers  = new List<IChannelObserver>();
+        }
+
+        #endregion
+
+        #region · Messaging Methods ·
+
+        protected void Subscribe<T>(Action<T> payloadHandler)
+            where T: class
+        {
+            this.Subscribe<T>(payloadHandler, ThreadOption.BackgroundThread);
+        }
+
+        protected void Subscribe<T>(Action<T> payloadHandler, ThreadOption threadOption)
+            where T: class
+        {
+            ChannelObserver<T> observer = new ChannelObserver<T>((l) => payloadHandler(l));
+
+            observer.Subscribe(threadOption);
+
+            this.observers.Add(observer);
+        }
+
+        protected void Publish<T>(T message)
+            where T: class
+        {
+            Channel<T>.Publish(message, true);
+        }
+
+        protected void Publish<T>(T message, bool async)
+            where T: class
+        {
+            Channel<T>.Publish(message, async);
+        }
+
+        #endregion
+
+        #region · Command Actions ·
+
+        /// <summary>
+        /// Determines whether the view related to this view model can be closed.
+        /// </summary>
+        /// <returns>
+        /// 	<c>true</c> if the related view can be closed; otherwise, <c>false</c>.
+        /// </returns>
+        public virtual bool CanClose()
+        {
+            return true;
+        }
+
+        /// <summary>
+        /// Called when the related view is being closed.
+        /// </summary>
+        public virtual void Close()
+        {
+            if (this.observers != null)
+            {
+                this.observers.ForEach(o => o.Unsubscribe());
+                this.observers.Clear();
+                this.observers = null;
+            }
+
+            this.GetService<IVirtualDesktopManager>().Close(this.Id);
+
+            this.id             = Guid.Empty;
+            this.title          = null;
+            this.closeCommand   = null;
+        }
+
+        #endregion
+    }
+}