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annotate Chronosv2/source/WidgetLibrary/WidgetLibraryViewModel.cs @ 12:6a0449185449

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author stevenh7776 stevenhollidge@hotmail.com
date Tue, 21 Feb 2012 17:47:35 +0700
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children 741981715d94
rev   line source
10
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1 using System;
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2 using System.Collections.Generic;
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3 using System.Collections.ObjectModel;
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4 using System.ComponentModel;
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5 using System.Linq;
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6 using System.Windows.Input;
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7 using Chronos.Presentation.Core.Configuration;
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8 using Chronos.Presentation.Core.VirtualDesktops;
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9 using Chronos.Presentation.Core.Widgets;
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10 using Chronos.Presentation.Core.Windows;
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11 using Chronos.Presentation.ViewModel;
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12 using NLog;
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13 using nRoute.Components;
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14
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15 namespace Chronos.WidgetLibrary
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16 {
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17 /// <summary>
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18 /// Widget library ViewModel
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19 /// </summary>
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20 public sealed class WidgetLibraryViewModel
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21 : WidgetViewModel
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22 {
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23 #region · Constants ·
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24
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25 private static readonly string AllWidgetsKey = "All";
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26
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27 #endregion
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28
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29 #region · PropertyChangedEventArgs Cached Instances ·
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30
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31 private static readonly PropertyChangedEventArgs FilterChangedArgs = CreateArgs<WidgetLibraryViewModel>(x => x.Filter);
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32 private static readonly PropertyChangedEventArgs WidgetsChangedArgs = CreateArgs<WidgetLibraryViewModel>(x => x.Widgets);
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33 private static readonly PropertyChangedEventArgs SelectedWidgetChangedArgs = CreateArgs<WidgetLibraryViewModel>(x => x.SelectedWidget);
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34
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35 #endregion
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36
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37 #region · Fields ·
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38
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39 private string filter;
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40 private List<string> groups;
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41 private List<WidgetItemViewModel> widgets;
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42 private IWidget selectedWidget;
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43 private ActionCommand createWidgetCommand;
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44
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45 #endregion
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46
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47 #region · Commands ·
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48
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49 /// <summary>
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50 /// Gets the create widget command.
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51 /// </summary>
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52 /// <value>The create widget command.</value>
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53 public ActionCommand CreateWidgetCommand
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54 {
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55 get
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56 {
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57 if (this.createWidgetCommand == null)
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58 {
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59 this.createWidgetCommand = new ActionCommand
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60 (
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61 () => OnCreateWidget(),
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62 () => CanCreateWidget()
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63 );
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64 }
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65
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66 return this.createWidgetCommand;
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67 }
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68 }
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69
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70 #endregion
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71
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72 #region · Properties ·
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73
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74 /// <summary>
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75 /// Gets/sets a fragment of the name to filter for.
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76 /// </summary>
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77 public string Filter
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78 {
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79 get { return this.filter; }
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80 set
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81 {
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82 if (value != filter)
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83 {
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84 this.filter = value;
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85 this.NotifyPropertyChanged(FilterChangedArgs);
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86 this.NotifyPropertyChanged(WidgetsChangedArgs);
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87
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88 this.SelectedWidget = null;
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89 }
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90 }
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91 }
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92
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93 /// <summary>
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94 /// Gets the list of widget groups.
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95 /// </summary>
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96 /// <value>The groups.</value>
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97 public IEnumerable<string> Groups
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98 {
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99 get { return this.groups; }
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100 }
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101
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102 /// <summary>
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103 /// Gets the list of widgets
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104 /// </summary>
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105 public IList<WidgetItemViewModel> Widgets
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106 {
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107 get
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108 {
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109 if (String.IsNullOrEmpty(this.filter)
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110 || this.filter == AllWidgetsKey)
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111 {
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112 return this.widgets;
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113 }
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114 else
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115 {
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116 return new ReadOnlyCollection<WidgetItemViewModel>(this.widgets.Where(x => x.Group == this.filter).ToList());
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117 }
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118 }
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119 }
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120
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121 /// <summary>
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122 /// Gets or sets the selected widget.
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123 /// </summary>
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124 /// <value>The selected widget.</value>
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125 public IWidget SelectedWidget
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126 {
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127 get { return this.selectedWidget; }
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128 set
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129 {
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130 if (this.selectedWidget != value)
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131 {
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132 this.selectedWidget = value;
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133 this.NotifyPropertyChanged(SelectedWidgetChangedArgs);
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134 this.CreateWidgetCommand.RequeryCanExecute();
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135 }
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136 }
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137 }
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138
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139 #endregion
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140
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141 #region · Constructors ·
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142
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143 /// <summary>
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144 /// Initializes a new instance of the <see cref="WidgetLibrary"/> class.
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145 /// </summary>
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146 public WidgetLibraryViewModel()
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147 : base()
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148 {
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149 this.widgets = this.DiscoverWidgets();
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150 this.groups = this.DiscoverWidgetGroups();
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151 }
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152
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153 #endregion
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154
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155 #region · Overriden Methods ·
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156
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157 /// <summary>
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158 /// Called when the related view is being closed.
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159 /// </summary>
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160 public override void Close()
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161 {
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162 base.Close();
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163
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164 this.selectedWidget = null;
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165 this.createWidgetCommand = null;
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166
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167 if (this.groups != null)
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168 {
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169 this.groups.Clear();
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170 this.groups = null;
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171 }
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172
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173 if (this.widgets != null)
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174 {
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175 this.widgets.Clear();
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176 this.widgets = null;
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177 }
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178 }
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179
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180 #endregion
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181
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182 #region · Command Actions ·
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183
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184 private bool CanCreateWidget()
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185 {
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186 return (this.selectedWidget != null);
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187 }
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188
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189 /// <summary>
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190 /// Handles the create widget command.
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191 /// </summary>
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192 private void OnCreateWidget()
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193 {
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194 this.GetService<IVirtualDesktopManager>()
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195 .Show(this.selectedWidget.CreateView() as IDesktopElement);
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196 }
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197
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198 #endregion
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199
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200 #region · Private Methods ·
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201
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202 private List<string> DiscoverWidgetGroups()
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203 {
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204 List<string> groups = new List<string>();
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205 var q = from widgetdef in this.widgets
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206 select widgetdef.Group;
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207
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208 groups.Add(AllWidgetsKey);
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209 groups.AddRange(q.Distinct().ToList());
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210
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211 return groups;
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212 }
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213
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214 private List<WidgetItemViewModel> DiscoverWidgets()
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215 {
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216 IEnumerable<IWidget> widgetDefs = this.GetService<IWidgetConfigurationService>()
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217 .GetWidgets();
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218
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219 if (widgetDefs != null)
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220 {
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221 var query = from widgetdef in widgetDefs
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222 select new WidgetItemViewModel(widgetdef);
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223
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224 return query.ToList();
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225 }
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226
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227 return null;
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228 }
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229
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230 #endregion
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231 }
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232 }