Mercurial > silverbladetech

annotate Chronosv2/source/Presentation/Windows/Controls/Desktop.cs @ 12:6a0449185449

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author stevenh7776 stevenhollidge@hotmail.com
date Tue, 21 Feb 2012 17:47:35 +0700
parents 443821e55f06
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10
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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. http://chronoswpf.codeplex.com/
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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;
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26 using System.Diagnostics;
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27 using System.Linq;
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28 using System.Windows;
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29 using System.Windows.Controls;
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30 using System.Windows.Documents;
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31 using System.Windows.Input;
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32 using Chronos.Extensions.Windows;
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33 using Chronos.Presentation.Core.ViewModel;
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34 using Chronos.Presentation.ViewModel;
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35
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36 namespace Chronos.Presentation.Windows.Controls
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37 {
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38 /// <summary>
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39 /// Virtual desktop representation using a <see cref="Canvas"/> control
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40 /// </summary>
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41 public class Desktop
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42 : Canvas
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43 {
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44 #region · Dependency Properties ·
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45
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46 /// <summary>
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47 /// Identifies the Id dependency property.
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48 /// </summary>
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49 public static readonly DependencyProperty IdProperty =
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50 DependencyProperty.Register("Id", typeof(Guid), typeof(Desktop),
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51 new FrameworkPropertyMetadata(Guid.NewGuid()));
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52
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53 #endregion
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54
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55 #region · Routed Commands ·
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56
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57 public static RoutedCommand GroupCommand = new RoutedCommand();
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58
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59 #endregion
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60
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61 #region · Static Constructor ·
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62
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63 /// <summary>
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64 /// Initializes the <see cref="Desktop"/> class.
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65 /// </summary>
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66 static Desktop()
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67 {
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68 Desktop.DefaultStyleKeyProperty.OverrideMetadata(typeof(Desktop),
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69 new FrameworkPropertyMetadata(typeof(Desktop)));
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70
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71 KeyboardNavigation.ControlTabNavigationProperty.OverrideMetadata(
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72 typeof(Desktop), new FrameworkPropertyMetadata(KeyboardNavigationMode.Cycle));
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73 }
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74
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75 #endregion
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76
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77 #region · Fields ·
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78
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79 private Point? rubberbandSelectionStartPoint;
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80 private SelectionService selectionService;
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81
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82 #endregion
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83
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84 #region · Properties ·
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85
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86 /// <summary>
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87 /// Gets or sets the element id.
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88 /// </summary>
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89 /// <value>The id.</value>
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90 public Guid Id
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91 {
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92 get { return (Guid)base.GetValue(IdProperty); }
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93 set { base.SetValue(IdProperty, value); }
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94 }
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95
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96 #endregion
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97
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98 #region · Internal Properties ·
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99
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100 internal SelectionService SelectionService
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101 {
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102 get
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103 {
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104 if (this.selectionService == null)
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105 {
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106 this.selectionService = new SelectionService(this);
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107 }
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108
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109 return this.selectionService;
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110 }
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111 }
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112
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113 #endregion
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114
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115 #region · Constructor ·
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116
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117 /// <summary>
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118 /// Initializes a new instance of the <see cref="Desktop"/> class.
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119 /// </summary>
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120 public Desktop()
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121 : base()
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122 {
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123 this.CommandBindings.Add(new CommandBinding(Desktop.GroupCommand, GroupExecuted, CanGroup));
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124 }
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125
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126 #endregion
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127
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128 #region · Methods ·
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129
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130 /// <summary>
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131 /// Adds the new desktop element.
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132 /// </summary>
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133 /// <param name="instance">The new desktop element.</param>
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134 /// <param name="position">The position.</param>
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135 public void AddElement(DesktopElement element)
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136 {
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137 element.Parent = this;
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138
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139 this.Children.Add(element);
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140
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141 this.DeactivateAll();
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142 element.Activate();
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143 }
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144
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145 /// <summary>
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146 /// Adds the new desktop element.
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147 /// </summary>
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148 /// <param name="instance">The new desktop element.</param>
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149 /// <param name="position">The position.</param>
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150 public void AddElement(DesktopElement element, Point position)
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151 {
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152 element.Parent = this;
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153
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154 this.Children.Add(element);
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155
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156 element.Move(Math.Max(0, position.X), Math.Max(0, position.Y));
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157 element.SetZIndex(0);
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158
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159 this.DeactivateAll();
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160 element.Activate();
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161 }
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162
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163 /// <summary>
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164 /// Removes the given element from the desktop.
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165 /// </summary>
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166 /// <param name="element">The element.</param>
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167 public void RemoveElement(DesktopElement instance)
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168 {
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169 Debug.Assert(instance is UIElement, "instance");
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170
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171 this.Children.Remove(instance as UIElement);
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172 }
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173
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174 public void Activate()
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175 {
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176 // Deactivate all Desktop elements
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177 this.DeactivateAll();
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178
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179 this.SetFocus();
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180 }
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181
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182 #endregion
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183
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184 #region · Mouse Handling Methods ·
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185
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186 /// <summary>
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187 /// Invoked when an unhandled <see cref="E:System.Windows.Input.Mouse.MouseDown"/> attached event
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188 /// reaches an element in its route that is derived from this class.
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189 /// Implement this method to add class handling for this event.
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190 /// </summary>
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191 /// <param name="e">The <see cref="T:System.Windows.Input.MouseButtonEventArgs"/>
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192 /// that contains the event data. This event data reports details about the mouse button that was pressed and the handled state.
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193 /// </param>
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194 protected override void OnMouseDown(MouseButtonEventArgs e)
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195 {
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196 if (Object.ReferenceEquals(e.Source, this))
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197 {
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198 this.Activate();
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199
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200 // in case that this click is the start of a
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201 // drag operation we cache the start point
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202 this.rubberbandSelectionStartPoint = new Point?(e.GetPosition(this));
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203
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204 // if you click directly on the canvas all
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205 // selected items are 'de-selected'
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206 SelectionService.ClearSelection();
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207
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208 e.Handled = true;
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209 }
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210
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211 base.OnMouseDown(e);
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212 }
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213
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214 /// <summary>
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215 /// Invoked when an unhandled <see cref="E:System.Windows.Input.Mouse.MouseMove"/> attached event
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216 /// reaches an element in its route that is derived from this class.
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217 /// Implement this method to add class handling for this event.
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218 /// </summary>
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219 /// <param name="e">The <see cref="T:System.Windows.Input.MouseEventArgs"/> that contains the event data.</param>
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220 protected override void OnMouseMove(MouseEventArgs e)
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221 {
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222 base.OnMouseMove(e);
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223
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224 // if mouse button is not pressed we have no drag operation, ...
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225 if (e.LeftButton != MouseButtonState.Pressed)
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226 {
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227 this.rubberbandSelectionStartPoint = null;
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228 }
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229 else if (this.rubberbandSelectionStartPoint.HasValue) // ... but if mouse button is pressed and start
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230 // point value is set we do have one
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231 {
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232 // create rubberband adorner
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233 AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(this);
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234
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235 if (adornerLayer != null)
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236 {
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237 RubberbandAdorner adorner = new RubberbandAdorner(this, rubberbandSelectionStartPoint);
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238
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239 if (adorner != null)
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240 {
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241 adornerLayer.Add(adorner);
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242 }
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243 }
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244
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245 e.Handled = true;
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246 }
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247 }
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248
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249 #endregion
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250
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251 #region · Internal Methods ·
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252
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253 /// <summary>
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254 /// Called when a <see cref="DesktopElement"/> gets activated.
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255 /// </summary>
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256 /// <param name="id">The id.</param>
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257 internal void OnActivatedElement(Guid id)
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258 {
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259 this.InvokeAsynchronouslyInBackground
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260 (
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261 () =>
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262 {
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263 this.Children.OfType<DesktopElement>()
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264 .Where(e => e.Id != id)
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265 .ToList()
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266 .ForEach(element => element.Deactivate());
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267 }
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268 );
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269 }
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270
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271 #endregion
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272
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273 #region · Private Methods ·
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274
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275 private void GroupExecuted(object sender, ExecutedRoutedEventArgs e)
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276 {
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277 var items = from item in this.SelectionService.CurrentSelection.OfType<DesktopElement>()
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278 select item;
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279
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280 ShortcutGroupElement group = new ShortcutGroupElement();
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281 ShortcutGroupViewModel vm = new ShortcutGroupViewModel();
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282 Point position = items.First().GetPosition();
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283
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284 foreach (DesktopElement item in items)
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285 {
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286 vm.Shortcuts.Add(item.DataContext as IShortcutViewModel);
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287
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288 this.RemoveElement(item);
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289 }
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290
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291 group.DataContext = vm;
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292
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293 this.SelectionService.ClearSelection();
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294
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295 this.InvokeAsynchronouslyInBackground
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296 (
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297 () =>
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298 {
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299 this.AddElement(group, position);
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300 }
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301 );
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302 }
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303
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304 private void CanGroup(object sender, CanExecuteRoutedEventArgs e)
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305 {
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306 int count = (from item in this.SelectionService.CurrentSelection.OfType<ISelectable>()
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307 select item).Count();
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308
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309 e.CanExecute = (count > 1);
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310 }
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311
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312 private void DeactivateAll()
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313 {
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314 this.InvokeAsynchronouslyInBackground
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315 (
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316 () =>
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317 {
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318 this.SelectionService.ClearSelection();
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319
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320 this.Children
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321 .OfType<DesktopElement>()
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322 .ToList()
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323 .ForEach(element => element.Deactivate());
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324 }
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325 );
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326 }
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327
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328 #endregion
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329 }
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330 }