Mercurial > silverbladetech

annotate Chronosv2/source/Presentation/ViewModel/ClosableViewModel.cs @ 19:09d18d6e5f40

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airport work
author stevenh7776 stevenhollidge@hotmail.com
date Thu, 15 Mar 2012 06:59:15 +0000
parents 443821e55f06
children
rev   line source
19
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1 using System;
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2 using System.Collections.Generic;
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3 using System.ComponentModel;
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4 using Chronos.Presentation.Core.ViewModel;
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5 using Chronos.Presentation.Core.VirtualDesktops;
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6 using NLog;
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7 using nRoute.Components;
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8 using nRoute.Components.Messaging;
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9
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10 namespace Chronos.Presentation.ViewModel
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11 {
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12 /// <summary>
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13 /// Base class for closeable view models
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14 /// </summary>
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15 public abstract class ClosableViewModel
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16 : ViewModelBase, IClosableViewModel
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17 {
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18 #region · NotifyPropertyChanged Cached Instances ·
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19
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20 private static readonly PropertyChangedEventArgs IdChangedArgs = CreateArgs<ClosableViewModel>(x => x.Id);
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21 private static readonly PropertyChangedEventArgs TitleChangedArgs = CreateArgs<ClosableViewModel>(x => x.Title);
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22
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23 #endregion
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24
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25 #region · Logger ·
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26
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27 private static Logger Logger = LogManager.GetCurrentClassLogger();
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28
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29 #endregion
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30
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31 #region · Fields ·
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32
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33 private Guid id;
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34 private ActionCommand closeCommand;
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35 private string title;
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36 private List<IChannelObserver> observers;
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37
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38 #endregion
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39
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40 #region · Commands ·
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41
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42 /// <summary>
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43 /// Gets the Close Command
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44 /// </summary>
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45 public ActionCommand CloseCommand
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46 {
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47 get
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48 {
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49 if (this.closeCommand == null)
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50 {
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51 this.closeCommand = new ActionCommand
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52 (
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53 () => Close(),
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54 () => CanClose()
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55 );
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56 }
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57
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58 return this.closeCommand;
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59 }
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60 }
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61
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62 #endregion
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63
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64 #region · Properties ·
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65
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66 /// <summary>
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67 /// Gets or sets the unique identifier.
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68 /// </summary>
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69 /// <value>The id.</value>
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70 public Guid Id
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71 {
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72 get { return this.id; }
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73 set
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74 {
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75 if (this.id != value)
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76 {
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77 this.id = value;
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78 this.NotifyPropertyChanged(IdChangedArgs);
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79 }
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80 }
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81 }
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82
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83 /// <summary>
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84 /// Returns the user-friendly name of this object.
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85 /// Child classes can set this property to a new value,
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86 /// or override it to determine the value on-demand.
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87 /// </summary>
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88 public virtual string Title
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89 {
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90 get { return this.title; }
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91 set
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92 {
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93 if (this.title != value)
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94 {
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95 this.title = value;
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96 this.NotifyPropertyChanged(TitleChangedArgs);
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97 }
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98 }
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99 }
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100
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101 #endregion
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102
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103 #region · Constructors ·
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104
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105 /// <summary>
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106 /// Initializes a new instance of the <see cref="ClosableViewModel"/> class.
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107 /// </summary>
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108 protected ClosableViewModel()
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109 : base()
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110 {
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111 this.Id = Guid.NewGuid();
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112 this.observers = new List<IChannelObserver>();
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113 }
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114
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115 #endregion
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116
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117 #region · Messaging Methods ·
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118
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119 protected void Subscribe<T>(Action<T> payloadHandler)
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120 where T: class
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121 {
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122 this.Subscribe<T>(payloadHandler, ThreadOption.BackgroundThread);
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123 }
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124
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125 protected void Subscribe<T>(Action<T> payloadHandler, ThreadOption threadOption)
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126 where T: class
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127 {
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128 ChannelObserver<T> observer = new ChannelObserver<T>((l) => payloadHandler(l));
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129
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130 observer.Subscribe(threadOption);
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131
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132 this.observers.Add(observer);
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133 }
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134
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135 protected void Publish<T>(T message)
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136 where T: class
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137 {
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138 Channel<T>.Publish(message, true);
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139 }
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140
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141 protected void Publish<T>(T message, bool async)
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142 where T: class
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143 {
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144 Channel<T>.Publish(message, async);
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145 }
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146
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147 #endregion
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148
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149 #region · Command Actions ·
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150
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151 /// <summary>
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152 /// Determines whether the view related to this view model can be closed.
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153 /// </summary>
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154 /// <returns>
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155 /// <c>true</c> if the related view can be closed; otherwise, <c>false</c>.
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156 /// </returns>
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157 public virtual bool CanClose()
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158 {
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159 return true;
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160 }
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161
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162 /// <summary>
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163 /// Called when the related view is being closed.
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164 /// </summary>
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165 public virtual void Close()
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166 {
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167 if (this.observers != null)
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168 {
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169 this.observers.ForEach(o => o.Unsubscribe());
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170 this.observers.Clear();
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171 this.observers = null;
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172 }
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173
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174 this.GetService<IVirtualDesktopManager>().Close(this.Id);
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175
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176 this.id = Guid.Empty;
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177 this.title = null;
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178 this.closeCommand = null;
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179 }
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180
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181 #endregion
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182 }
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183 }