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annotate Chronosv2/source/Presentation/Widgets/Navigator/NavigatorWidgetViewModel.cs @ 10:443821e55f06

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author stevenh7776 stevenhollidge@hotmail.com
date Tue, 21 Feb 2012 17:25:44 +0700
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1 /*
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2 The MIT License
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3
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4 Copyright (c) 2009-2010. Carlos Guzmán Álvarez. http://chronoswpf.codeplex.com/
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5
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6 Permission is hereby granted, free of charge, to any person obtaining a copy
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7 of this software and associated documentation files (the "Software"), to deal
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8 in the Software without restriction, including without limitation the rights
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9 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 copies of the Software, and to permit persons to whom the Software is
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11 furnished to do so, subject to the following conditions:
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12
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13 The above copyright notice and this permission notice shall be included in
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14 all copies or substantial portions of the Software.
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15
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16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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19 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 THE SOFTWARE.
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23 */
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24
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25 using System;
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26 using System.Collections.Generic;
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27 using System.Collections.ObjectModel;
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28 using System.Linq;
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29 using System.Windows.Input;
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30 using Chronos.Extensions;
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31 using Chronos.Presentation.Core.Navigation;
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32 using Chronos.Presentation.ViewModel;
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33 using Chronos.Presentation.Windows;
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34 using nRoute.Components;
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35 using nRoute.Services;
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36 using nRoute.SiteMaps;
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37
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38 namespace Chronos.Presentation.Widgets
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39 {
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40 /// <summary>
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41 /// Navigator Widget ViewModel
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42 /// </summary>
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43 /// <remarks>
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44 /// http://www.codeproject.com/KB/WPF/TreeViewWithViewModel.aspx
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45 /// </remarks>
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46 public sealed class NavigatorWidgetViewModel
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47 : WidgetViewModel
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48 {
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49 #region · Fields ·
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50
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51 private readonly ReadOnlyCollection<NavigationNode> functions;
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52 private readonly SiteMapNode rootOption;
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53 private List<NavigationNode> filteredFunctions;
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54 private string filterText;
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55 private ICommand navigateToCommand;
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56
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57 #endregion
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58
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59 #region · Commands ·
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60
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61 /// <summary>
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62 /// Gets the navigation command
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63 /// </summary>
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64 public ICommand NavigateToCommand
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65 {
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66 get
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67 {
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68 if (this.navigateToCommand == null)
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69 {
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70 this.navigateToCommand = new ActionCommand<string>
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71 (
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72 x => OnNavigateTo(x),
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73 x => CanNavigate()
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74 );
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75 }
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76
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77 return this.navigateToCommand;
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78 }
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79 }
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80
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81 #endregion
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82
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83 #region · Properties ·
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84
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85 #region · FirstGeneration ·
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86
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87 /// <summary>
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88 /// Returns a read-only collection containing the first application option
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89 /// in the tree, to which the TreeView can bind.
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90 /// </summary>
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91 public ReadOnlyCollection<NavigationNode> Functions
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92 {
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93 get
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94 {
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95 if (String.IsNullOrEmpty(this.filterText))
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96 {
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97 return this.functions;
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98 }
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99 else
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100 {
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101 return new ReadOnlyCollection<NavigationNode>(this.filteredFunctions);
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102 }
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103 }
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104 }
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105
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106 #endregion
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107
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108 #region · FilterText ·
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109
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110 /// <summary>
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111 /// Gets/sets a fragment of the name to filter for.
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112 /// </summary>
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113 public string FilterText
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114 {
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115 get { return this.filterText; }
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116 set
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117 {
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118 if (value != filterText)
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119 {
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120 this.filterText = value;
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121 this.PerformFilter();
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122 }
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123 }
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124 }
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125
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126 #endregion
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127
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128 #endregion
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129
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130 #region · Constructor ·
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131
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132 /// <summary>
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133 /// Initializes a new instance of the <see cref="NavigatorWidget"/> class.
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134 /// </summary>
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135 public NavigatorWidgetViewModel()
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136 : base()
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137 {
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138 if (!DesignMode.IsInDesignMode)
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139 {
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140 this.rootOption = SiteMapService.SiteMap.RootNode;
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141 this.filteredFunctions = new List<NavigationNode>();
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142 this.functions = new ReadOnlyCollection<NavigationNode>(this.rootOption.ChildNodes.OfType<NavigationNode>().ToArray());
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143 }
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144 }
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145
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146 #endregion
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147
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148 #region · Command Actions ·
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149
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150 /// <summary>
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151 /// Returns a value indcating whether the navigation command can be executed
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152 /// </summary>
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153 /// <returns></returns>
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154 private bool CanNavigate()
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155 {
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156 return this.filteredFunctions != null && this.filteredFunctions.Count == 1;
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157 }
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158
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159 /// <summary>
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160 /// Handles the navigation command
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161 /// </summary>
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162 private void OnNavigateTo(string url)
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163 {
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164 ServiceLocator.GetService<INavigationService>().Navigate(url);
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165 }
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166
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167 #endregion
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168
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169 #region · Search Logic ·
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170
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171 private void PerformFilter()
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172 {
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173 this.VerifyMatchingOptionEnumerator();
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174 }
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175
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176 private void VerifyMatchingOptionEnumerator()
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177 {
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178 // Clear current matching options
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179 this.filteredFunctions.Clear();
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180
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181 // Perform filter if needed
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182 if (!String.IsNullOrEmpty(this.filterText))
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183 {
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184 this.filteredFunctions.AddRange(this.FindMatches(this.filterText));
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185 }
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186
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187 // Notify changes
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188 this.NotifyPropertyChanged(() => Functions);
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189 }
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190
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191 private List<NavigationNode> FindMatches(string filterText)
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192 {
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193 var nodes = from node in this.rootOption
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194 .ChildNodes
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195 .OfType<NavigationNode>()
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196 .Traverse<NavigationNode>(node => ((node.ChildNodes) != null ? node.ChildNodes.OfType<NavigationNode>() : null))
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197 where node.Title.StartsWith(filterText, StringComparison.OrdinalIgnoreCase) && (node.ChildNodes == null || node.ChildNodes.Count == 0)
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198 select node;
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199
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200 return nodes.ToList();
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201 }
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202
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203 #endregion
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204 }
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205 }