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annotate Chronosv2/source/WidgetLibrary/WidgetLibraryViewModel.cs @ 14:741981715d94

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Initial review and translations
author stevenh7776 stevenhollidge@hotmail.com
date Tue, 21 Feb 2012 18:59:30 +0700
parents 443821e55f06
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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 Chronos.Presentation.Core.Configuration;
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7 using Chronos.Presentation.Core.VirtualDesktops;
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8 using Chronos.Presentation.Core.Widgets;
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9 using Chronos.Presentation.Core.Windows;
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10 using Chronos.Presentation.ViewModel;
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11 using nRoute.Components;
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12
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13 namespace Chronos.WidgetLibrary
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14 {
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15 /// <summary>
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16 /// Widget library ViewModel
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17 /// </summary>
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18 public sealed class WidgetLibraryViewModel
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19 : WidgetViewModel
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20 {
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21 #region · Constants ·
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22
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23 private static readonly string AllWidgetsKey = "All";
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24
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25 #endregion
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26
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27 #region · PropertyChangedEventArgs Cached Instances ·
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28
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29 private static readonly PropertyChangedEventArgs FilterChangedArgs = CreateArgs<WidgetLibraryViewModel>(x => x.Filter);
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30 private static readonly PropertyChangedEventArgs WidgetsChangedArgs = CreateArgs<WidgetLibraryViewModel>(x => x.Widgets);
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31 private static readonly PropertyChangedEventArgs SelectedWidgetChangedArgs = CreateArgs<WidgetLibraryViewModel>(x => x.SelectedWidget);
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32
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33 #endregion
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34
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35 #region · Fields ·
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36
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37 private string filter;
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38 private List<string> groups;
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39 private List<WidgetItemViewModel> widgets;
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40 private IWidget selectedWidget;
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41 private ActionCommand createWidgetCommand;
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42
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43 #endregion
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44
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45 #region · Commands ·
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46
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47 /// <summary>
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48 /// Gets the create widget command.
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49 /// </summary>
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50 /// <value>The create widget command.</value>
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51 public ActionCommand CreateWidgetCommand
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52 {
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53 get
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54 {
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55 if (this.createWidgetCommand == null)
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56 {
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57 this.createWidgetCommand = new ActionCommand
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58 (
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59 () => OnCreateWidget(),
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60 () => CanCreateWidget()
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61 );
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62 }
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63
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64 return this.createWidgetCommand;
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65 }
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66 }
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67
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68 #endregion
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69
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70 #region · Properties ·
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71
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72 /// <summary>
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73 /// Gets/sets a fragment of the name to filter for.
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74 /// </summary>
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75 public string Filter
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76 {
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77 get { return this.filter; }
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78 set
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79 {
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80 if (value != filter)
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81 {
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82 this.filter = value;
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83 this.NotifyPropertyChanged(FilterChangedArgs);
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84 this.NotifyPropertyChanged(WidgetsChangedArgs);
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85
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86 this.SelectedWidget = null;
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87 }
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88 }
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89 }
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90
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91 /// <summary>
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92 /// Gets the list of widget groups.
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93 /// </summary>
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94 /// <value>The groups.</value>
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95 public IEnumerable<string> Groups
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96 {
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97 get { return this.groups; }
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98 }
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99
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100 /// <summary>
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101 /// Gets the list of widgets
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102 /// </summary>
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103 public IList<WidgetItemViewModel> Widgets
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104 {
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105 get
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106 {
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107 if (String.IsNullOrEmpty(this.filter)
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108 || this.filter == AllWidgetsKey)
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109 {
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110 return this.widgets;
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111 }
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112 else
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113 {
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114 return new ReadOnlyCollection<WidgetItemViewModel>(this.widgets.Where(x => x.Group == this.filter).ToList());
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115 }
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116 }
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117 }
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118
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119 /// <summary>
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120 /// Gets or sets the selected widget.
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121 /// </summary>
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122 /// <value>The selected widget.</value>
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123 public IWidget SelectedWidget
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124 {
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125 get { return this.selectedWidget; }
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126 set
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127 {
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128 if (this.selectedWidget != value)
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129 {
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130 this.selectedWidget = value;
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131 this.NotifyPropertyChanged(SelectedWidgetChangedArgs);
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132 this.CreateWidgetCommand.RequeryCanExecute();
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133 }
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134 }
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135 }
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136
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137 #endregion
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138
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139 #region · Constructors ·
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140
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141 /// <summary>
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142 /// Initializes a new instance of the <see cref="WidgetLibrary"/> class.
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143 /// </summary>
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144 public WidgetLibraryViewModel()
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145 : base()
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146 {
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147 this.widgets = this.DiscoverWidgets();
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148 this.groups = this.DiscoverWidgetGroups();
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149 }
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150
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151 #endregion
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152
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153 #region · Overriden Methods ·
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154
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155 /// <summary>
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156 /// Called when the related view is being closed.
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157 /// </summary>
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158 public override void Close()
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159 {
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160 base.Close();
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161
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162 this.selectedWidget = null;
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163 this.createWidgetCommand = null;
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164
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165 if (this.groups != null)
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166 {
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167 this.groups.Clear();
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168 this.groups = null;
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169 }
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170
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171 if (this.widgets != null)
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172 {
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173 this.widgets.Clear();
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174 this.widgets = null;
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175 }
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176 }
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177
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178 #endregion
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179
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180 #region · Command Actions ·
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181
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182 private bool CanCreateWidget()
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183 {
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184 return (this.selectedWidget != null);
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185 }
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186
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187 /// <summary>
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188 /// Handles the create widget command.
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189 /// </summary>
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190 private void OnCreateWidget()
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191 {
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192 this.GetService<IVirtualDesktopManager>()
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193 .Show(this.selectedWidget.CreateView() as IDesktopElement);
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194 }
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195
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196 #endregion
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197
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198 #region · Private Methods ·
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199
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200 private List<string> DiscoverWidgetGroups()
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201 {
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202 List<string> groups = new List<string>();
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203 var q = from widgetdef in this.widgets
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204 select widgetdef.Group;
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205
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206 groups.Add(AllWidgetsKey);
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207 groups.AddRange(q.Distinct().ToList());
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208
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209 return groups;
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210 }
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211
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212 private List<WidgetItemViewModel> DiscoverWidgets()
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213 {
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214 IEnumerable<IWidget> widgetDefs = this.GetService<IWidgetConfigurationService>()
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215 .GetWidgets();
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216
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217 if (widgetDefs != null)
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218 {
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219 var query = from widgetdef in widgetDefs
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220 select new WidgetItemViewModel(widgetdef);
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221
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222 return query.ToList();
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223 }
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224
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225 return null;
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226 }
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227
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228 #endregion
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229 }
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230 }