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annotate Chronosv2/source/DragAndDrop/DragHelper.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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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 }
443821e55f06 Initial cleaned up add from Codeplex files
stevenh7776 stevenhollidge@hotmail.com
parents:
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459
443821e55f06 Initial cleaned up add from Codeplex files
stevenh7776 stevenhollidge@hotmail.com
parents:
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460 this.IsDragging = false;
443821e55f06 Initial cleaned up add from Codeplex files
stevenh7776 stevenhollidge@hotmail.com
parents:
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461 }
443821e55f06 Initial cleaned up add from Codeplex files
stevenh7776 stevenhollidge@hotmail.com
parents:
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462
443821e55f06 Initial cleaned up add from Codeplex files
stevenh7776 stevenhollidge@hotmail.com
parents:
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463 #endregion
443821e55f06 Initial cleaned up add from Codeplex files
stevenh7776 stevenhollidge@hotmail.com
parents:
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464 }
443821e55f06 Initial cleaned up add from Codeplex files
stevenh7776 stevenhollidge@hotmail.com
parents:
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465 }