Mercurial > silverbladetech
annotate Chronosv2/source/DragAndDrop/DragHelper.cs @ 12:6a0449185449
SCC changed from TFS to HG
author | stevenh7776 stevenhollidge@hotmail.com |
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date | Tue, 21 Feb 2012 17:47:35 +0700 |
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10
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1 using System; |
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2 using System.Diagnostics; |
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3 using System.Windows; |
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4 using System.Windows.Documents; |
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5 using System.Windows.Input; |
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6 using System.Windows.Interop; |
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7 using System.Windows.Media; |
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8 using System.Windows.Shapes; |
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9 using Chronos.Interop; |
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10 |
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11 namespace Chronos.Presentation.DragAndDrop |
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12 { |
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13 public sealed class DragHelper |
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14 { |
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15 #region · Static Methods · |
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16 |
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17 private static UIElement GetDragElementOnHitTest(UIElement src, MouseEventArgs args) |
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18 { |
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19 HitTestResult hr = VisualTreeHelper.HitTest(src, args.GetPosition((IInputElement)src)); |
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20 return hr.VisualHit as UIElement; |
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21 } |
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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 dragSource; |
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28 private UIElement dragScope; |
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29 private IDataDropObjectProvider callback; |
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30 private Point startPoint; |
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31 private DragAdorner adorner; |
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32 private AdornerLayer layer; |
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33 private Window dragdropWindow; |
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34 private DragDropEffects allowedEffects; |
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35 private bool mouseLeftScope; |
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36 private bool isDragging; |
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37 private double opacity; |
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38 |
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39 #endregion |
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40 |
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41 #region · Properties · |
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42 |
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43 public double Opacity |
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44 { |
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45 get { return this.opacity; } |
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46 } |
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47 |
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48 public DragDropEffects AllowedEffects |
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49 { |
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50 get { return this.allowedEffects; } |
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51 set { this.allowedEffects = value; } |
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52 } |
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53 |
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54 #endregion |
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55 |
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56 #region · Private Properties · |
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57 |
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58 private UIElement DragSource |
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59 { |
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60 get { return this.dragSource; } |
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61 set |
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62 { |
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63 this.dragSource = value; |
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64 this.WireEvents(value); |
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65 } |
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66 } |
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67 |
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68 private UIElement DragScope |
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69 { |
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70 get { return this.dragScope; } |
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71 set { this.dragScope = value; } |
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72 } |
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73 |
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74 private IDataDropObjectProvider Callback |
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75 { |
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76 get { return this.callback; } |
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77 set { this.callback = value; } |
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78 } |
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79 |
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80 private bool IsDragging |
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81 { |
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82 get { return this.isDragging; } |
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83 set { this.isDragging = value; } |
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84 } |
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85 |
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86 private bool AllowsLink |
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87 { |
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88 get { return ((this.AllowedEffects & DragDropEffects.Link) != 0); } |
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89 } |
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90 |
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91 private bool AllowsMove |
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92 { |
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93 get { return ((this.AllowedEffects & DragDropEffects.Move) != 0); } |
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94 } |
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95 |
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96 private bool AllowsCopy |
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97 { |
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98 get { return ((this.AllowedEffects & DragDropEffects.Copy) != 0); } |
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99 } |
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100 |
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101 #endregion |
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102 |
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103 #region · Constructors · |
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104 |
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105 public DragHelper(UIElement dragSource, IDataDropObjectProvider callback, UIElement dragScope) |
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106 { |
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107 this.allowedEffects = DragDropEffects.Copy | DragDropEffects.Move; |
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108 this.opacity = 0.7; |
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109 this.DragSource = dragSource; |
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110 this.Callback = callback; |
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111 this.DragScope = dragScope; |
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112 } |
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113 |
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114 #endregion |
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115 |
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116 #region · DragSource Event Handlers · |
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117 |
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118 private void DragSource_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e) |
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119 { |
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120 this.startPoint = e.GetPosition(DragScope); |
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121 } |
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122 |
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123 #if DEBUG |
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124 void DragSource_PreviewMouseLeftButtonUp(object sender, System.Windows.Input.MouseButtonEventArgs e) |
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125 { |
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126 System.Diagnostics.Debug.Assert(IsDragging == false); |
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127 } |
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128 #endif |
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129 |
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130 private void DragSource_PreviewMouseMove(object sender, System.Windows.Input.MouseEventArgs e) |
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131 { |
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132 if (e.LeftButton == MouseButtonState.Pressed && !this.IsDragging) |
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133 { |
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134 Point position = e.GetPosition((IInputElement)DragScope); |
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135 |
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136 if (Math.Abs(position.X - startPoint.X) > SystemParameters.MinimumHorizontalDragDistance || |
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137 Math.Abs(position.Y - startPoint.Y) > SystemParameters.MinimumVerticalDragDistance) |
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138 { |
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139 this.StartDrag(e); |
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140 } |
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141 } |
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142 } |
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143 |
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144 #endregion |
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145 |
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146 #region · DragScope Event Handlers · |
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147 |
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148 private void DragScope_DragLeave(object sender, DragEventArgs args) |
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149 { |
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150 if (args.OriginalSource == this.DragScope) |
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151 { |
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152 this.mouseLeftScope = true; |
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153 } |
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154 } |
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155 |
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156 private void DragScope_DragOver(object sender, DragEventArgs args) |
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157 { |
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158 if (this.adorner != null) |
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159 { |
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160 this.adorner.LeftOffset = args.GetPosition(this.DragScope).X; /* - _startPoint.X */ |
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161 this.adorner.TopOffset = args.GetPosition(this.DragScope).Y; /* - _startPoint.Y */ |
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162 } |
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163 } |
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164 |
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165 #endregion |
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166 |
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167 #region · Event Wiring · |
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168 |
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169 private void WireEvents(UIElement uie) |
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170 { |
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171 Debug.Assert(uie != null); |
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172 |
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173 if (uie != null) |
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174 { |
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175 uie.PreviewMouseLeftButtonDown += new MouseButtonEventHandler(DragSource_PreviewMouseLeftButtonDown); |
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176 uie.PreviewMouseMove += new MouseEventHandler(DragSource_PreviewMouseMove); |
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177 |
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178 #if DEBUG |
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179 uie.PreviewMouseLeftButtonUp += new MouseButtonEventHandler(DragSource_PreviewMouseLeftButtonUp); |
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180 #endif |
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181 } |
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182 } |
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183 |
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184 #endregion |
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185 |
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186 #region · Private Methods · |
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187 |
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188 private void StartDrag(MouseEventArgs args) |
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189 { |
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190 IDataObject data = null; |
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191 UIElement dragelement = null; |
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192 |
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193 // ADD THE DATA |
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194 if (this.Callback != null) |
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195 { |
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196 DragDataWrapper dw = new DragDataWrapper(); |
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197 |
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198 data = new DataObject(typeof(DragDataWrapper).ToString(), dw); |
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199 |
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200 if ((this.Callback.SupportedActions & DragDropProviderActions.MultiFormatData) != 0) |
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201 { |
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202 this.Callback.AppendData(ref data, args); |
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203 } |
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204 |
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205 if ((this.Callback.SupportedActions & DragDropProviderActions.Data) != 0) |
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206 { |
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207 dw.Data = this.Callback.GetData(); |
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208 } |
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209 |
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210 if ((this.Callback.SupportedActions & DragDropProviderActions.Visual) != 0) |
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211 { |
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212 dragelement = this.Callback.GetVisual(args); |
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213 } |
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214 else |
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215 { |
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216 dragelement = args.OriginalSource as UIElement; |
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217 } |
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218 |
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219 dw.Source = this.DragSource; |
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220 dw.Shim = this.Callback; |
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221 |
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222 Debug.Assert(this.DragScope == null, "The DragDataWrapper is meant for in-proc... Sorry for asserting, just wanted to confirm.. comment out assertion if needed"); |
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223 } |
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224 else |
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225 { |
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226 dragelement = args.OriginalSource as UIElement; |
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227 data = new DataObject(typeof(UIElement).ToString(), dragelement); |
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228 } |
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229 |
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230 if (dragelement == null || data == null || dragelement == this.DragSource) |
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231 { |
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232 return; |
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233 } |
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234 |
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235 DragEventHandler dragOver = null; |
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236 DragEventHandler dragLeave = null; |
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237 QueryContinueDragEventHandler queryContinue = null; |
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238 GiveFeedbackEventHandler giveFeedback = null; |
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239 DragDropEffects effects = this.GetDragDropEffects(); |
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240 DragDropEffects resultEffects; |
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241 |
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242 // Inprocess Drag ... |
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243 if (this.DragScope != null) |
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244 { |
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245 bool previousAllowDrop = this.DragScope.AllowDrop; |
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246 |
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247 this.adorner = new DragAdorner(this.DragScope, (UIElement)dragelement, true, this.Opacity); |
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248 this.layer = AdornerLayer.GetAdornerLayer(this.DragScope as Visual); |
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249 |
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250 this.layer.Add(this.adorner); |
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251 |
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252 if (this.DragScope != this.DragSource) |
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253 { |
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254 this.DragScope.AllowDrop = true; |
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255 |
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256 DragDrop.AddPreviewDragOverHandler((DependencyObject)this.DragScope, dragOver = new DragEventHandler(DragScope_DragOver)); |
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257 DragDrop.AddPreviewDragLeaveHandler(this.DragScope, dragLeave = new DragEventHandler(DragScope_DragLeave)); |
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258 DragDrop.AddPreviewQueryContinueDragHandler(this.DragSource, queryContinue = new QueryContinueDragEventHandler(OnQueryContinueDrag)); |
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259 } |
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260 |
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261 try |
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262 { |
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263 this.IsDragging = true; |
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264 this.mouseLeftScope = false; |
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265 resultEffects = DragDrop.DoDragDrop(this.DragSource, data, effects); |
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266 |
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267 this.DragFinished(resultEffects); |
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268 } |
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269 catch |
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270 { |
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271 Debug.Assert(false); |
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272 } |
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273 |
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274 if (this.DragScope != this.DragSource) |
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275 { |
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276 this.DragScope.AllowDrop = previousAllowDrop; |
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277 |
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278 DragDrop.RemovePreviewDragOverHandler(this.DragScope, dragOver); |
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279 DragDrop.RemovePreviewDragLeaveHandler(this.DragScope, dragLeave); |
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280 DragDrop.RemovePreviewQueryContinueDragHandler(this.DragSource, queryContinue); |
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281 } |
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282 } |
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283 else |
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284 { |
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285 DragDrop.AddPreviewQueryContinueDragHandler(this.DragSource, queryContinue = new QueryContinueDragEventHandler(OnQueryContinueDrag)); |
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286 DragDrop.AddGiveFeedbackHandler(this.DragSource, giveFeedback = new GiveFeedbackEventHandler(OnGiveFeedback)); |
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287 |
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288 this.IsDragging = true; |
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289 |
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290 if ((this.Callback.SupportedActions & DragDropProviderActions.Visual) != 0) |
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291 { |
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292 this.CreateDragDropWindow(dragelement); |
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293 this.dragdropWindow.Show(); |
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294 } |
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295 |
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296 try |
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297 { |
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298 resultEffects = DragDrop.DoDragDrop(this.DragSource, data, effects); |
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299 } |
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300 finally |
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301 { |
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302 } |
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303 |
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304 if ((this.Callback.SupportedActions & DragDropProviderActions.Visual) != 0) |
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305 { |
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306 this.DestroyDragDropWindow(); |
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307 } |
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308 |
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309 DragDrop.RemovePreviewQueryContinueDragHandler(this.DragSource, OnQueryContinueDrag); |
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310 DragDrop.AddGiveFeedbackHandler(this.DragSource, OnGiveFeedback); |
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311 |
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312 this.IsDragging = false; |
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313 this.DragFinished(resultEffects); |
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314 } |
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315 } |
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316 |
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317 private DragDropEffects GetDragDropEffects() |
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318 { |
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319 DragDropEffects effects = DragDropEffects.None; |
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320 |
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321 bool ctrl = Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl); |
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322 bool shift = Keyboard.IsKeyDown(Key.LeftShift) || Keyboard.IsKeyDown(Key.RightShift); |
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323 |
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324 if (ctrl && shift && this.AllowsLink) |
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325 { |
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326 effects |= DragDropEffects.Link; |
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327 } |
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328 else if (ctrl && this.AllowsCopy) |
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329 { |
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330 effects |= DragDropEffects.Copy; |
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331 } |
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332 else if (this.AllowsMove) |
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333 { |
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334 effects |= DragDropEffects.Move; |
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335 } |
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336 |
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337 return effects; |
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338 } |
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339 |
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340 private void OnGiveFeedback(object sender, GiveFeedbackEventArgs args) |
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341 { |
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342 args.UseDefaultCursors = ((this.Callback.SupportedActions & DragDropProviderActions.Visual) == 0); |
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343 args.Handled = true; |
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344 } |
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345 |
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346 private void OnQueryContinueDrag(object sender, QueryContinueDragEventArgs e) |
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347 { |
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348 #if DEBUG |
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349 if (this.DragScope != null) |
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350 { |
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351 Point pd = Mouse.GetPosition(this.DragScope); |
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352 } |
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353 #endif |
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354 if (this.DragScope == null) |
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355 { |
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356 this.UpdateWindowLocation(); |
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357 } |
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358 else |
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359 { |
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360 Point p = Mouse.GetPosition(this.DragScope); |
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361 |
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362 if (this.adorner != null) |
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363 { |
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364 this.adorner.LeftOffset = p.X /* - _startPoint.X */ ; |
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365 this.adorner.TopOffset = p.Y /* - _startPoint.Y */ ; |
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366 } |
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367 |
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368 if (this.mouseLeftScope) |
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369 { |
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370 e.Action = DragAction.Cancel; |
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371 e.Handled = true; |
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372 } |
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373 } |
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374 } |
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375 |
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376 private void DestroyDragDropWindow() |
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377 { |
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378 if (this.dragdropWindow != null) |
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379 { |
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380 this.dragdropWindow.Close(); |
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381 this.dragdropWindow = null; |
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382 } |
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383 } |
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384 |
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385 private void CreateDragDropWindow(Visual dragElement) |
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386 { |
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387 Debug.Assert(this.dragdropWindow == null); |
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388 |
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389 this.dragdropWindow = new Window(); |
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390 |
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391 this.dragdropWindow.WindowStyle = WindowStyle.None; |
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392 this.dragdropWindow.AllowsTransparency = true; |
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393 this.dragdropWindow.AllowDrop = false; |
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394 this.dragdropWindow.Background = null; |
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395 this.dragdropWindow.IsHitTestVisible = false; |
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396 this.dragdropWindow.SizeToContent = SizeToContent.WidthAndHeight; |
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397 this.dragdropWindow.Topmost = true; |
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398 this.dragdropWindow.ShowInTaskbar = false; |
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399 |
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400 this.dragdropWindow.SourceInitialized += new EventHandler( |
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401 delegate(object sender, EventArgs args) |
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402 { |
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403 //TODO assert that we can do this.. |
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404 PresentationSource windowSource = PresentationSource.FromVisual(this.dragdropWindow); |
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405 IntPtr handle = ((HwndSource)windowSource).Handle; |
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406 |
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407 Int32 styles = Win32Interop.GetWindowLong(handle, Win32Interop.GWL_EXSTYLE); |
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408 |
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409 Win32Interop.SetWindowLong(handle, Win32Interop.GWL_EXSTYLE, styles | Win32Interop.WS_EX_LAYERED | Win32Interop.WS_EX_TRANSPARENT); |
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410 }); |
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411 |
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412 Rectangle r = new Rectangle(); |
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413 |
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414 r.Width = ((FrameworkElement)dragElement).ActualWidth; |
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415 r.Height = ((FrameworkElement)dragElement).ActualHeight; |
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416 r.Fill = new VisualBrush(dragElement); |
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417 |
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418 this.dragdropWindow.Content = r; |
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419 |
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420 // we want QueryContinueDrag notification so we can update the window position |
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421 //DragDrop.AddPreviewQueryContinueDragHandler(source, QueryContinueDrag); |
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422 |
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423 // put the window in the right place to start |
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424 this.UpdateWindowLocation(); |
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425 } |
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426 |
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427 private void UpdateWindowLocation() |
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428 { |
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429 if (this.dragdropWindow != null) |
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430 { |
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431 Win32Interop.POINT p; |
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432 |
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433 if (!Win32Interop.GetCursorPos(out p)) |
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434 { |
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435 return; |
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436 } |
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437 |
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438 this.dragdropWindow.Left = (double)p.X; |
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439 this.dragdropWindow.Top = (double)p.Y; |
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440 } |
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441 } |
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442 |
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443 private void DragFinished(DragDropEffects ret) |
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444 { |
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445 Mouse.Capture(null); |
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446 |
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447 if (this.IsDragging) |
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448 { |
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449 if (this.DragScope != null) |
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450 { |
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451 //AdornerLayer.GetAdornerLayer(this.DragScope).Remove(this.adorner); |
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452 //this.adorner = null; |
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453 } |
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454 else |
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455 { |
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456 this.DestroyDragDropWindow(); |
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457 } |
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458 } |
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459 |
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460 this.IsDragging = false; |
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461 } |
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462 |
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463 #endregion |
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464 } |
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465 } |