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comparison Chronosv2/source/Presentation/ViewModel/ClosableViewModel.cs @ 10:443821e55f06

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Initial cleaned up add from Codeplex files
author stevenh7776 stevenhollidge@hotmail.com
date Tue, 21 Feb 2012 17:25:44 +0700
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children 09d18d6e5f40
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9:904a9faadf8b 10:443821e55f06
1 /*
2 The MIT License
3
4 Copyright (c) 2009-2010. Carlos Guzmán Álvarez. http://chronoswpf.codeplex.com/
5
6 Permission is hereby granted, free of charge, to any person obtaining a copy
7 of this software and associated documentation files (the "Software"), to deal
8 in the Software without restriction, including without limitation the rights
9 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 copies of the Software, and to permit persons to whom the Software is
11 furnished to do so, subject to the following conditions:
12
13 The above copyright notice and this permission notice shall be included in
14 all copies or substantial portions of the Software.
15
16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 THE SOFTWARE.
23 */
24
25 using System;
26 using System.Collections.Generic;
27 using System.ComponentModel;
28 using Chronos.Presentation.Core.ViewModel;
29 using Chronos.Presentation.Core.VirtualDesktops;
30 using NLog;
31 using nRoute.Components;
32 using nRoute.Components.Messaging;
33
34 namespace Chronos.Presentation.ViewModel
35 {
36 /// <summary>
37 /// Base class for closeable view models
38 /// </summary>
39 public abstract class ClosableViewModel
40 : ViewModelBase, IClosableViewModel
41 {
42 #region · NotifyPropertyChanged Cached Instances ·
43
44 private static readonly PropertyChangedEventArgs IdChangedArgs = CreateArgs<ClosableViewModel>(x => x.Id);
45 private static readonly PropertyChangedEventArgs TitleChangedArgs = CreateArgs<ClosableViewModel>(x => x.Title);
46
47 #endregion
48
49 #region · Logger ·
50
51 private static Logger Logger = LogManager.GetCurrentClassLogger();
52
53 #endregion
54
55 #region · Fields ·
56
57 private Guid id;
58 private ActionCommand closeCommand;
59 private string title;
60 private List<IChannelObserver> observers;
61
62 #endregion
63
64 #region · Commands ·
65
66 /// <summary>
67 /// Gets the Close Command
68 /// </summary>
69 public ActionCommand CloseCommand
70 {
71 get
72 {
73 if (this.closeCommand == null)
74 {
75 this.closeCommand = new ActionCommand
76 (
77 () => Close(),
78 () => CanClose()
79 );
80 }
81
82 return this.closeCommand;
83 }
84 }
85
86 #endregion
87
88 #region · Properties ·
89
90 /// <summary>
91 /// Gets or sets the unique identifier.
92 /// </summary>
93 /// <value>The id.</value>
94 public Guid Id
95 {
96 get { return this.id; }
97 set
98 {
99 if (this.id != value)
100 {
101 this.id = value;
102 this.NotifyPropertyChanged(IdChangedArgs);
103 }
104 }
105 }
106
107 /// <summary>
108 /// Returns the user-friendly name of this object.
109 /// Child classes can set this property to a new value,
110 /// or override it to determine the value on-demand.
111 /// </summary>
112 public virtual string Title
113 {
114 get { return this.title; }
115 set
116 {
117 if (this.title != value)
118 {
119 this.title = value;
120 this.NotifyPropertyChanged(TitleChangedArgs);
121 }
122 }
123 }
124
125 #endregion
126
127 #region · Constructors ·
128
129 /// <summary>
130 /// Initializes a new instance of the <see cref="ClosableViewModel"/> class.
131 /// </summary>
132 protected ClosableViewModel()
133 : base()
134 {
135 this.Id = Guid.NewGuid();
136 this.observers = new List<IChannelObserver>();
137 }
138
139 #endregion
140
141 #region · Messaging Methods ·
142
143 protected void Subscribe<T>(Action<T> payloadHandler)
144 where T: class
145 {
146 this.Subscribe<T>(payloadHandler, ThreadOption.BackgroundThread);
147 }
148
149 protected void Subscribe<T>(Action<T> payloadHandler, ThreadOption threadOption)
150 where T: class
151 {
152 ChannelObserver<T> observer = new ChannelObserver<T>((l) => payloadHandler(l));
153
154 observer.Subscribe(threadOption);
155
156 this.observers.Add(observer);
157 }
158
159 protected void Publish<T>(T message)
160 where T: class
161 {
162 Channel<T>.Publish(message, true);
163 }
164
165 protected void Publish<T>(T message, bool async)
166 where T: class
167 {
168 Channel<T>.Publish(message, async);
169 }
170
171 #endregion
172
173 #region · Command Actions ·
174
175 /// <summary>
176 /// Determines whether the view related to this view model can be closed.
177 /// </summary>
178 /// <returns>
179 /// <c>true</c> if the related view can be closed; otherwise, <c>false</c>.
180 /// </returns>
181 public virtual bool CanClose()
182 {
183 return true;
184 }
185
186 /// <summary>
187 /// Called when the related view is being closed.
188 /// </summary>
189 public virtual void Close()
190 {
191 if (this.observers != null)
192 {
193 this.observers.ForEach(o => o.Unsubscribe());
194 this.observers.Clear();
195 this.observers = null;
196 }
197
198 this.GetService<IVirtualDesktopManager>().Close(this.Id);
199
200 this.id = Guid.Empty;
201 this.title = null;
202 this.closeCommand = null;
203 }
204
205 #endregion
206 }
207 }