Mercurial > silverbladetech

annotate Chronosv2/source/DragAndDrop/DragDropManager.cs @ 28:4c0dea4760c5

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RabbitMq working
author adminsh@apollo
date Wed, 21 Mar 2012 20:29:04 +0000
parents 09d18d6e5f40
children
rev   line source
19
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1 using System.Collections.Generic;
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2 using System.Windows;
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3 using System.Windows.Controls;
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4
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5 namespace Chronos.Presentation.DragAndDrop
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6 {
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7 public sealed class DragDropManager
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8 {
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9 #region · Singleton Instance ·
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10
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11 public static readonly DragDropManager Instance = new DragDropManager();
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12
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13 #endregion
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14
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15 #region · Attached Properties ·
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16
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17 /// <summary>
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18 /// Identifies the IsDesktopCanvas dependency property.
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19 /// </summary>
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20 public static readonly DependencyProperty IsDropTargetProperty =
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21 DependencyProperty.RegisterAttached("IsDropTarget", typeof(bool), typeof(DragDropManager),
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22 new FrameworkPropertyMetadata(false,
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23 new PropertyChangedCallback(OnIsDropTarget)));
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24
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25 /// <summary>
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26 /// Identifies the IsDragSource dependency property.
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27 /// </summary>
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28 public static readonly DependencyProperty IsDragSourceProperty =
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29 DependencyProperty.RegisterAttached("IsDragSource", typeof(bool), typeof(DragDropManager),
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30 new FrameworkPropertyMetadata(false,
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31 new PropertyChangedCallback(OnIsDragSource)));
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32
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33 #endregion
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34
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35 #region · Dependency Property Get/Set Methods ·
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36
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37 /// <summary>
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38 /// Gets the value of the IsDropTarget attached property
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39 /// </summary>
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40 /// <param name="d"></param>
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41 /// <returns></returns>
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42 public static bool GetIsDropTarget(DependencyObject d)
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43 {
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44 return (bool)d.GetValue(IsDropTargetProperty);
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45 }
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46
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47 /// <summary>
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48 /// Sets the value of the IsDropTarget attached property
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49 /// </summary>
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50 /// <param name="d"></param>
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51 /// <param name="value"></param>
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52 public static void SetIsDropTarget(DependencyObject d, bool value)
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53 {
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54 d.SetValue(IsDropTargetProperty, value);
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55 }
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56
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57 /// <summary>
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58 /// Gets the value of the IsDragSource attached property
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59 /// </summary>
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60 /// <param name="d"></param>
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61 /// <returns></returns>
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62 public static bool GetIsDragSource(DependencyObject d)
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63 {
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64 return (bool)d.GetValue(IsDragSourceProperty);
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65 }
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66
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67 /// <summary>
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68 /// Sets the value of the IsDragSource attached property
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69 /// </summary>
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70 /// <param name="d"></param>
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71 /// <param name="value"></param>
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72 public static void SetIsDragSource(DependencyObject d, bool value)
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73 {
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74 d.SetValue(IsDragSourceProperty, value);
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75 }
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76
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77 #endregion
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78
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79 #region · Dependency Property Callbacks ·
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80
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81 private static void OnIsDropTarget(DependencyObject d, DependencyPropertyChangedEventArgs e)
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82 {
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83 FrameworkElement element = d as FrameworkElement;
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84
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85 if (element != null)
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86 {
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87 DragDropManager.Instance.AttachDropTarget(element);
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88 }
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89 }
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90
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91 private static void OnIsDragSource(DependencyObject d, DependencyPropertyChangedEventArgs e)
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92 {
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93 FrameworkElement element = d as FrameworkElement;
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94
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95 if (element != null)
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96 {
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97 DragDropManager.Instance.AttachDragSource(element);
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98 }
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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 · Fields ·
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104
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105 private Dictionary<FrameworkElement, DropHelper> dropTargets;
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106 private Dictionary<FrameworkElement, DragHelper> dragSources;
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107
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108 #endregion
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109
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110 #region · Constructors ·
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111
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112 private DragDropManager()
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113 {
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114 this.dropTargets = new Dictionary<FrameworkElement, DropHelper>();
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115 this.dragSources = new Dictionary<FrameworkElement, DragHelper>();
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116 }
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117
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118 #endregion
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119
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120 #region · Private Methods ·
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121
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122 private void AttachDropTarget(FrameworkElement element)
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123 {
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124 if (!this.dropTargets.ContainsKey(element))
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125 {
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126 element.Unloaded += new RoutedEventHandler(DragDropManager_Unloaded);
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127 this.dropTargets.Add(element, new DropHelper(element));
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128 }
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129 }
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130
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131 private void AttachDragSource(FrameworkElement element)
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132 {
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133 if (!this.dragSources.ContainsKey(element))
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134 {
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135 element.Unloaded += new RoutedEventHandler(DragDropManager_Unloaded);
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136
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137 if (element is ListBox)
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138 {
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139 this.dragSources.Add(element, new DragHelper(element, new ListBoxDragDropDataProvider(element as ListBox), null));
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140 }
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141 else if (element is TreeView)
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142 {
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143 this.dragSources.Add(element, new DragHelper(element, new TreeViewDragDropDataProvider(element as TreeView), null));
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144 }
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145 }
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146 }
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147
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148 #endregion
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149
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150 #region · Event Handlers ·
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151
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152 private void DragDropManager_Unloaded(object sender, RoutedEventArgs e)
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153 {
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154 (sender as FrameworkElement).Unloaded -= new RoutedEventHandler(DragDropManager_Unloaded);
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155
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156 if (this.dragSources.ContainsKey(sender as FrameworkElement))
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157 {
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158 this.dragSources.Remove(sender as FrameworkElement);
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159 }
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160 else if (this.dropTargets.ContainsKey(sender as FrameworkElement))
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161 {
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162 this.dropTargets.Remove(sender as FrameworkElement);
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163 }
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164 }
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165
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166 #endregion
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167 }
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168 }