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annotate Chronosv2/source/DragAndDrop/DropHelper.cs @ 10:443821e55f06

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Initial cleaned up add from Codeplex files
author stevenh7776 stevenhollidge@hotmail.com
date Tue, 21 Feb 2012 17:25:44 +0700
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10
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1 using System;
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2 using System.Collections;
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3 using System.Diagnostics;
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4 using System.IO;
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5 using System.Text;
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6 using System.Windows;
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7 using System.Windows.Controls;
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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.ViewModel;
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11 using Chronos.Presentation.Windows.Controls;
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12 using nRoute.Services;
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13 using nRoute.SiteMaps;
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14
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15 namespace Chronos.Presentation.DragAndDrop
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16 {
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17 public sealed class DropHelper
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18 {
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19 #region · Consts ·
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20
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21 const string UrlDataFormat = "text/x-moz-url";
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22
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23 #endregion
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24
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25 #region · Fields ·
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26
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27 private UIElement dropTarget = null;
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28 private string[] datatypes = { typeof(UIElement).ToString(), "Text" };
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29 private DragDropEffects allowedEffects;
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30
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31 #endregion
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32
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33 #region · Properties ·
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34
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35 public string[] AllowedDataTypes
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36 {
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37 get { return this.datatypes; }
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38 set
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39 {
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40 this.datatypes = value;
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41
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42 for (int x = 0; x < this.datatypes.Length; x++)
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43 {
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44 this.datatypes[x] = this.datatypes[x].ToLower();
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45 }
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46 }
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47 }
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48
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49 public DragDropEffects AllowedEffects
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50 {
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51 get { return this.allowedEffects; }
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52 set { this.allowedEffects = value; }
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53 }
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54
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55 #endregion
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56
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57 #region · Constructors ·
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58
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59 public DropHelper(UIElement wrapper)
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60 {
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61 this.dropTarget = wrapper;
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62
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63 this.dropTarget.AllowDrop = true;
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64 this.dropTarget.DragOver += new DragEventHandler(DropTarget_DragOver);
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65 this.dropTarget.Drop += new DragEventHandler(DropTarget_Drop);
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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 · DropTarget Event Handlers ·
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71
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72 private void DropTarget_Drop(object sender, DragEventArgs e)
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73 {
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74 IDataObject data = e.Data;
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75 DragDataWrapper dw = null;
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76 bool isDataOperation = false;
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77
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78 Debug.Assert(data != null);
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79
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80 if (data.GetDataPresent(typeof(DragDataWrapper).ToString()))
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81 {
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82 dw = data.GetData(typeof(DragDataWrapper).ToString()) as DragDataWrapper;
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83
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84 Debug.Assert(dw.Shim != null);
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85
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86 if ((dw.Shim.SupportedActions & DragDropProviderActions.Data) != 0)
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87 {
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88 isDataOperation = true;
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89 }
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90 }
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91
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92 // Try a BRUTE FORCE APPROACH on UIElement just to show how it could be done
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93 // BUT NOT ENDORSING IT!!!
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94 if (!isDataOperation)
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95 {
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96 if (this.dropTarget is Canvas)
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97 {
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98 if (e.Data.GetDataPresent(DataFormats.FileDrop))
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99 {
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100 this.DropFileLink(e);
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101 }
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102 else if (e.Data.GetDataPresent(UrlDataFormat))
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103 {
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104 this.DropUrl(e);
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105 }
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106 }
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107 }
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108 else
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109 {
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110 Debug.Assert(dw != null);
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111 Debug.Assert(dw.Shim != null);
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112
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113 object rawdata = dw.Data;
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114
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115 if (this.dropTarget is ItemsControl)
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116 {
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117 this.DropItemsControlHandler(e, rawdata);
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118 }
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119 else if (dropTarget is Canvas)
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120 {
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121 if (rawdata is IWidget)
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122 {
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123 this.DropCanvasWidget(e, rawdata as IWidget);
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124 }
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125 else if (rawdata is SiteMapNode)
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126 {
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127 this.DropCanvasInternalLink(e, rawdata as NavigationNode);
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128 }
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129 }
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130 }
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131
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132 e.Handled = true;
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133 }
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134
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135 private void DropTarget_DragOver(object sender, DragEventArgs e)
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136 {
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137 string[] types = e.Data.GetFormats();
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138 bool match = false;
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139
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140 if (datatypes == null || types == null)
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141 {
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142 //TODO: ??? Should we set for DragDropEffects.None?
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143 return;
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144 }
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145
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146 foreach (string s in types)
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147 {
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148 foreach (string type in datatypes)
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149 {
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150 match = (s.ToLower() == type);
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151
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152 if (match)
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153 {
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154 break;
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155 }
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156 }
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157
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158 if (match)
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159 {
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160 break;
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161 }
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162 }
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163
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164 if (match)
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165 {
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166 e.Effects = AllowedEffects;
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167 e.Handled = true;
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168 }
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169 }
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170
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171 #endregion
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172
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173 #region · Drop Handlers Methods ·
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174
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175 private void DropCanvasWidget(DragEventArgs e, IWidget dropObject)
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176 {
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177 ServiceLocator.GetService<IVirtualDesktopManager>()
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178 .Show
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179 (
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180 dropObject.CreateView() as WidgetElement,
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181 e.GetPosition(this.dropTarget)
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182 );
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183 }
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184
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185 private void DropItemsControlHandler(DragEventArgs e, object rawdata)
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186 {
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187 ItemsControl ic = this.dropTarget as ItemsControl;
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188 IList list = ic.ItemsSource as IList;
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189
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190 if (list == null)
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191 {
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192 list = ic.Items as System.Collections.IList;
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193 }
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194
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195 if (list != null)
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196 {
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197 if (!list.Contains(rawdata))
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198 {
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199 // Here we do not check for Move | Copy ... because this is a DATA operation .. No parent relationshop at all ...
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200 list.Add(rawdata);
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201 }
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202 else
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203 {
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204 // nothing was done ...
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205 e.Effects = DragDropEffects.None;
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206 }
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207 }
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208 else
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209 {
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210 e.Effects = DragDropEffects.None;
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211 }
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212 }
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213
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214 private void DropFileLink(DragEventArgs e)
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215 {
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216 // External link drop
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217 Point position = e.GetPosition(this.dropTarget);
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218 string[] filenames = e.Data.GetData(DataFormats.FileDrop, true) as string[];
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219
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220 e.Effects = DragDropEffects.Link;
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221
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222 foreach (string filename in filenames)
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223 {
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224 ServiceLocator.GetService<IVirtualDesktopManager>()
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225 .CreateShortcut<ExternalShortcutViewModel>
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226 (
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227 Path.GetFileNameWithoutExtension(filename), filename, position
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228 );
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229 }
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230 }
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231
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232 private void DropUrl(DragEventArgs e)
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233 {
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234 // External link drop
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235 Point position = e.GetPosition(this.dropTarget);
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236 String data = null;
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237
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238 using (MemoryStream stream = e.Data.GetData(UrlDataFormat, true) as MemoryStream)
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239 {
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240 using (StreamReader reader = new StreamReader(stream, Encoding.Unicode))
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241 {
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242 data = reader.ReadToEnd().Replace("\0", "");
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243 }
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244 }
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245
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246 if (!String.IsNullOrEmpty(data))
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247 {
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248 string[] elements = data.Split('\n');
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249
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250 e.Effects = DragDropEffects.Link;
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251
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252 if (!String.IsNullOrWhiteSpace(elements[0]) &&
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253 !String.IsNullOrWhiteSpace(elements[1]))
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254 {
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255 ServiceLocator.GetService<IVirtualDesktopManager>()
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256 .CreateShortcut<ExternalShortcutViewModel>
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257 (
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258 elements[1],
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259 elements[0],
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260 position
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261 );
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262 }
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263 }
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264 }
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265
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266 private void DropCanvasInternalLink(DragEventArgs e, NavigationNode siteMapNode)
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267 {
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268 Point position = e.GetPosition(this.dropTarget);
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269
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270 ServiceLocator.GetService<IVirtualDesktopManager>()
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271 .CreateShortcut<InternalShortcutViewModel>
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272 (
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273 siteMapNode.Title,
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274 siteMapNode.Url,
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275 position
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276 );
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277 }
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278
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279 #endregion
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280
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281 #region · Private Methods ·
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282
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283 private bool Unparent(DragDataWrapper dw, UIElement uie)
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284 {
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285 bool success = false;
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286
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287 if (dw != null)
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288 {
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289 if (dw.AllowChildrenRemove)
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290 {
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291 dw.Shim.UnParent();
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292 }
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293 }
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294
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295 if (!success) // BRUTE FORCE
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296 {
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297 if (uie is FrameworkElement)
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298 {
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299 FrameworkElement fe = uie as FrameworkElement;
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300
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301 if (fe.Parent != null)
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302 {
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303 if (fe.Parent is Panel)
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304 {
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305 try
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306 {
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307 ((Panel)(fe.Parent)).Children.Remove(uie);
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308 success = true;
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309 }
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310 catch (Exception)
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311 {
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312 #if DEBUG
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313 System.Diagnostics.Debug.Assert(false);
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314 #endif
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315 }
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316 }
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317 }
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318 else if (fe.Parent is ContentControl)
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319 {
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320 ContentControl cc = fe.Parent as ContentControl;
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321
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322 cc.Content = null;
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323 success = true;
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324 }
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325 }
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326 }
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327
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328 return success;
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329 }
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330
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331 #endregion
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332 }
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333 }