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

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author stevenh7776 stevenhollidge@hotmail.com
date Tue, 21 Feb 2012 17:25:44 +0700
parents
children 09d18d6e5f40
rev   line source
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1 /*
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2 The MIT License
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3
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4 Copyright (c) 2009-2010 Carlos Guzmán Álvarez
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5
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6 Permission is hereby granted, free of charge, to any person obtaining a copy
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7 of this software and associated documentation files (the "Software"), to deal
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8 in the Software without restriction, including without limitation the rights
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9 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 copies of the Software, and to permit persons to whom the Software is
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11 furnished to do so, subject to the following conditions:
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12
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13 The above copyright notice and this permission notice shall be included in
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14 all copies or substantial portions of the Software.
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15
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16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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19 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 THE SOFTWARE.
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23 */
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24
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25 using System.Collections.Generic;
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26 using System.Windows;
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27 using System.Windows.Controls;
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28
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29 namespace Chronos.Presentation.DragAndDrop
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30 {
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31 public sealed class DragDropManager
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32 {
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33 #region · Singleton Instance ·
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34
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35 public static readonly DragDropManager Instance = new DragDropManager();
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36
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37 #endregion
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38
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39 #region · Attached Properties ·
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40
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41 /// <summary>
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42 /// Identifies the IsDesktopCanvas dependency property.
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43 /// </summary>
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44 public static readonly DependencyProperty IsDropTargetProperty =
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45 DependencyProperty.RegisterAttached("IsDropTarget", typeof(bool), typeof(DragDropManager),
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46 new FrameworkPropertyMetadata(false,
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47 new PropertyChangedCallback(OnIsDropTarget)));
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48
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49 /// <summary>
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50 /// Identifies the IsDragSource dependency property.
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51 /// </summary>
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52 public static readonly DependencyProperty IsDragSourceProperty =
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53 DependencyProperty.RegisterAttached("IsDragSource", typeof(bool), typeof(DragDropManager),
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54 new FrameworkPropertyMetadata(false,
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55 new PropertyChangedCallback(OnIsDragSource)));
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56
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57 #endregion
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58
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59 #region · Dependency Property Get/Set Methods ·
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60
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61 /// <summary>
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62 /// Gets the value of the IsDropTarget attached property
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63 /// </summary>
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64 /// <param name="d"></param>
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65 /// <returns></returns>
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66 public static bool GetIsDropTarget(DependencyObject d)
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67 {
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68 return (bool)d.GetValue(IsDropTargetProperty);
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69 }
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70
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71 /// <summary>
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72 /// Sets the value of the IsDropTarget attached property
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73 /// </summary>
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74 /// <param name="d"></param>
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75 /// <param name="value"></param>
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76 public static void SetIsDropTarget(DependencyObject d, bool value)
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77 {
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78 d.SetValue(IsDropTargetProperty, value);
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79 }
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80
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81 /// <summary>
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82 /// Gets the value of the IsDragSource attached property
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83 /// </summary>
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84 /// <param name="d"></param>
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85 /// <returns></returns>
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86 public static bool GetIsDragSource(DependencyObject d)
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87 {
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88 return (bool)d.GetValue(IsDragSourceProperty);
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89 }
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90
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91 /// <summary>
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92 /// Sets the value of the IsDragSource attached property
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93 /// </summary>
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94 /// <param name="d"></param>
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95 /// <param name="value"></param>
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96 public static void SetIsDragSource(DependencyObject d, bool value)
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97 {
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98 d.SetValue(IsDragSourceProperty, value);
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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 · Dependency Property Callbacks ·
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104
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105 private static void OnIsDropTarget(DependencyObject d, DependencyPropertyChangedEventArgs e)
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106 {
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107 FrameworkElement element = d as FrameworkElement;
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108
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109 if (element != null)
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110 {
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111 DragDropManager.Instance.AttachDropTarget(element);
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112 }
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113 }
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114
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115 private static void OnIsDragSource(DependencyObject d, DependencyPropertyChangedEventArgs e)
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116 {
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117 FrameworkElement element = d as FrameworkElement;
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118
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119 if (element != null)
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120 {
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121 DragDropManager.Instance.AttachDragSource(element);
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122 }
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123 }
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124
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125 #endregion
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126
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127 #region · Fields ·
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128
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129 private Dictionary<FrameworkElement, DropHelper> dropTargets;
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130 private Dictionary<FrameworkElement, DragHelper> dragSources;
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131
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132 #endregion
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133
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134 #region · Constructors ·
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135
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136 private DragDropManager()
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137 {
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138 this.dropTargets = new Dictionary<FrameworkElement, DropHelper>();
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139 this.dragSources = new Dictionary<FrameworkElement, DragHelper>();
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140 }
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141
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142 #endregion
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143
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144 #region · Private Methods ·
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145
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146 private void AttachDropTarget(FrameworkElement element)
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147 {
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148 if (!this.dropTargets.ContainsKey(element))
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149 {
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150 element.Unloaded += new RoutedEventHandler(DragDropManager_Unloaded);
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151 this.dropTargets.Add(element, new DropHelper(element));
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152 }
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153 }
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154
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155 private void AttachDragSource(FrameworkElement element)
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156 {
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157 if (!this.dragSources.ContainsKey(element))
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158 {
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159 element.Unloaded += new RoutedEventHandler(DragDropManager_Unloaded);
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160
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161 if (element is ListBox)
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162 {
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163 this.dragSources.Add(element, new DragHelper(element, new ListBoxDragDropDataProvider(element as ListBox), null));
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164 }
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165 else if (element is TreeView)
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166 {
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167 this.dragSources.Add(element, new DragHelper(element, new TreeViewDragDropDataProvider(element as TreeView), null));
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168 }
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169 }
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170 }
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171
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172 #endregion
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173
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174 #region · Event Handlers ·
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175
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176 private void DragDropManager_Unloaded(object sender, RoutedEventArgs e)
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177 {
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178 (sender as FrameworkElement).Unloaded -= new RoutedEventHandler(DragDropManager_Unloaded);
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179
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180 if (this.dragSources.ContainsKey(sender as FrameworkElement))
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181 {
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182 this.dragSources.Remove(sender as FrameworkElement);
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183 }
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184 else if (this.dropTargets.ContainsKey(sender as FrameworkElement))
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185 {
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186 this.dropTargets.Remove(sender as FrameworkElement);
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187 }
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188 }
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189
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190 #endregion
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191 }
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192 }