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annotate MetroWpf/MetroWpf.Xaml/Transitions/TransitionPresenter.cs @ 24:a8b50a087544

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Stocks and FxRates working, new menu introduced. Working nicely so far
author adminsh@apollo
date Tue, 20 Mar 2012 20:18:35 +0000
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rev   line source
24
a8b50a087544 Stocks and FxRates working, new menu introduced. Working nicely so far
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1 using System;
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2 using System.Windows;
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3 using System.Windows.Controls;
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4 using System.Windows.Documents;
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5 using System.Windows.Media;
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6
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7 namespace MetroWpf.Xaml.Transitions
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8 {
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9 [System.Windows.Markup.ContentProperty("Content")]
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10 public class TransitionPresenter : FrameworkElement
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11 {
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12 static TransitionPresenter()
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13 {
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14 ClipToBoundsProperty.OverrideMetadata(typeof(TransitionPresenter), new FrameworkPropertyMetadata(null, CoerceClipToBounds));
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15 }
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16
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17 // Force clip to be true if the active Transition requires it
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18 private static object CoerceClipToBounds(object element, object value)
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19 {
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20 TransitionPresenter transitionElement = (TransitionPresenter)element;
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21 bool clip = (bool)value;
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22 if (!clip && transitionElement.IsTransitioning)
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23 {
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24 Transition transition = transitionElement.Transition;
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25 if (transition.ClipToBounds)
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26 return true;
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27 }
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28 return value;
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29 }
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30
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31 public object Content
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32 {
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33 get { return (object)GetValue(ContentProperty); }
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34 set { SetValue(ContentProperty, value); }
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35 }
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36
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37 public static readonly DependencyProperty ContentProperty =
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38 DependencyProperty.Register("Content",
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39 typeof(object),
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40 typeof(TransitionPresenter),
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41 new UIPropertyMetadata(null, OnContentChanged, CoerceContent));
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42
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43 // Don't update content until done transitioning
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44 private static object CoerceContent(object element, object value)
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45 {
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46 TransitionPresenter te = (TransitionPresenter)element;
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47 if (te.IsTransitioning)
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48 return te.CurrentContentPresenter.Content;
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49 return value;
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50 }
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51
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52 private static void OnContentChanged(object element, DependencyPropertyChangedEventArgs e)
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53 {
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54 TransitionPresenter te = (TransitionPresenter)element;
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55 te.BeginTransition();
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56 }
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57
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58 public DataTemplate ContentTemplate
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59 {
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60 get { return (DataTemplate)GetValue(ContentTemplateProperty); }
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61 set { SetValue(ContentTemplateProperty, value); }
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62 }
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63
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64 public static readonly DependencyProperty ContentTemplateProperty =
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65 DependencyProperty.Register("ContentTemplate",
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66 typeof(DataTemplate),
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67 typeof(TransitionPresenter),
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68 new UIPropertyMetadata(null, OnContentTemplateChanged));
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69
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70 private static void OnContentTemplateChanged(object element, DependencyPropertyChangedEventArgs e)
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71 {
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72 TransitionPresenter te = (TransitionPresenter)element;
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73 te.CurrentContentPresenter.ContentTemplate = (DataTemplate)e.NewValue;
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74 }
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75
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76 public DataTemplateSelector ContentTemplateSelector
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77 {
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78 get { return (DataTemplateSelector)GetValue(ContentTemplateSelectorProperty); }
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79 set { SetValue(ContentTemplateSelectorProperty, value); }
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80 }
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81
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82 public static readonly DependencyProperty ContentTemplateSelectorProperty =
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83 DependencyProperty.Register("ContentTemplateSelector",
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84 typeof(DataTemplateSelector),
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85 typeof(TransitionPresenter),
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86 new UIPropertyMetadata(null, OnContentTemplateSelectorChanged));
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87
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88 private static void OnContentTemplateSelectorChanged(object element, DependencyPropertyChangedEventArgs e)
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89 {
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90 TransitionPresenter te = (TransitionPresenter)element;
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91 te.CurrentContentPresenter.ContentTemplateSelector = (DataTemplateSelector)e.NewValue;
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92 }
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93
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94 public bool IsTransitioning
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95 {
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96 get { return (bool)GetValue(IsTransitioningProperty); }
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97 private set { SetValue(IsTransitioningPropertyKey, value); }
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98 }
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99
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100 private static readonly DependencyPropertyKey IsTransitioningPropertyKey =
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101 DependencyProperty.RegisterReadOnly("IsTransitioning",
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102 typeof(bool),
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103 typeof(TransitionPresenter),
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104 new UIPropertyMetadata(false));
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105
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106 public static readonly DependencyProperty IsTransitioningProperty =
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107 IsTransitioningPropertyKey.DependencyProperty;
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108
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109 public Transition Transition
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110 {
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111 get { return (Transition)GetValue(TransitionProperty); }
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112 set { SetValue(TransitionProperty, value); }
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113 }
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114
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115 public static readonly DependencyProperty TransitionProperty =
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116 DependencyProperty.Register("Transition", typeof(Transition), typeof(TransitionPresenter), new UIPropertyMetadata(null, null, CoerceTransition));
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117
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118 private static object CoerceTransition(object element, object value)
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119 {
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120 TransitionPresenter te = (TransitionPresenter)element;
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121 if (te.IsTransitioning) return te._activeTransition;
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122 return value;
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123 }
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124
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125 public TransitionSelector TransitionSelector
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126 {
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127 get { return (TransitionSelector)GetValue(TransitionSelectorProperty); }
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128 set { SetValue(TransitionSelectorProperty, value); }
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129 }
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130
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131 public static readonly DependencyProperty TransitionSelectorProperty =
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132 DependencyProperty.Register("TransitionSelector", typeof(TransitionSelector), typeof(TransitionPresenter), new UIPropertyMetadata(null));
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133
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134 public TransitionPresenter()
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135 {
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136 _children = new UIElementCollection(this, null);
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137 ContentPresenter currentContent = new ContentPresenter();
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138 _currentHost = new AdornerDecorator();
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139 _currentHost.Child = currentContent;
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140 _children.Add(_currentHost);
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141
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142 ContentPresenter previousContent = new ContentPresenter();
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143 _previousHost = new AdornerDecorator();
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144 _previousHost.Child = previousContent;
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145 }
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146
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147 private void BeginTransition()
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148 {
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149 TransitionSelector selector = TransitionSelector;
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150
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151 Transition transition = selector != null ?
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152 selector.SelectTransition(CurrentContentPresenter.Content, Content) :
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153 Transition;
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154
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155 if (transition != null)
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156 {
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157 // Swap content presenters
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158 AdornerDecorator temp = _previousHost;
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159 _previousHost = _currentHost;
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160 _currentHost = temp;
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161 }
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162
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163 ContentPresenter currentContent = CurrentContentPresenter;
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164 // Set the current content
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165 currentContent.Content = Content;
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166 currentContent.ContentTemplate = ContentTemplate;
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167 currentContent.ContentTemplateSelector = ContentTemplateSelector;
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168
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169 if (transition != null)
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170 {
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171 ContentPresenter previousContent = PreviousContentPresenter;
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172
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173 if (transition.IsNewContentTopmost)
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174 Children.Add(_currentHost);
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175 else
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176 Children.Insert(0, _currentHost);
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177
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178 IsTransitioning = true;
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179 _activeTransition = transition;
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180 CoerceValue(TransitionProperty);
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181 CoerceValue(ClipToBoundsProperty);
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182 transition.BeginTransition(this, previousContent, currentContent);
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183 }
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184 }
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185
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186 // Clean up after the transition is complete
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187 internal void OnTransitionCompleted()
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188 {
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189 _children.Clear();
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190 _children.Add(_currentHost);
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191 _currentHost.Visibility = Visibility.Visible;
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192 _previousHost.Visibility = Visibility.Visible;
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193 ((ContentPresenter)_previousHost.Child).Content = null;
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194
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195 IsTransitioning = false;
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196 _activeTransition = null;
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197 CoerceValue(TransitionProperty);
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198 CoerceValue(ClipToBoundsProperty);
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199 CoerceValue(ContentProperty);
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200 }
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201
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202 protected override Size MeasureOverride(Size availableSize)
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203 {
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204 _currentHost.Measure(availableSize);
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205 return _currentHost.DesiredSize;
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206 }
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207
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208 protected override Size ArrangeOverride(Size finalSize)
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209 {
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210 foreach (UIElement uie in _children)
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211 uie.Arrange(new Rect(finalSize));
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212 return finalSize;
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213 }
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214
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215 protected override int VisualChildrenCount
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216 {
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217 get { return _children.Count; }
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218 }
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219
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220 protected override Visual GetVisualChild(int index)
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221 {
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222 if (index < 0 || index >= _children.Count)
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223 throw new ArgumentOutOfRangeException("index");
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224 return _children[index];
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225 }
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226
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227 internal UIElementCollection Children
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228 {
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229 get { return _children; }
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230 }
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231
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232 private ContentPresenter PreviousContentPresenter
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233 {
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234 get { return ((ContentPresenter)_previousHost.Child); }
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235 }
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236
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237 private ContentPresenter CurrentContentPresenter
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238 {
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239 get { return ((ContentPresenter)_currentHost.Child); }
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240 }
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241
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242 private UIElementCollection _children;
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243
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244 private AdornerDecorator _currentHost;
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245 private AdornerDecorator _previousHost;
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246
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247 private Transition _activeTransition;
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248 }
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249 }