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annotate SilverlightGlimpse/SilverFlow.Controls/Controllers/ResizeController.cs @ 63:536498832a79

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Latest version before changing bindings to Listbox
author Steven Hollidge <stevenhollidge@hotmail.com>
date Sun, 22 Apr 2012 13:33:42 +0100
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63
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1 using System;
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2 using System.Windows;
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3 using System.Windows.Input;
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4 using SilverFlow.Controls.Enums;
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5 using SilverFlow.Controls.Extensions;
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6
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7 namespace SilverFlow.Controls.Controllers
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8 {
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9 /// <summary>
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10 /// Calculates resizing element position and size.
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11 /// </summary>
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12 public class ResizeController
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13 {
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14 /// <summary>
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15 /// Thickness of resizing area.
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16 /// </summary>
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17 private const double ResizingAreaDefaultValue = 6;
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18
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19 /// <summary>
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20 /// Minimal width of the resized window if MinWidth is set to 0.
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21 /// </summary>
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22 private const double MinResizedWidth = 20;
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23
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24 /// <summary>
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25 /// Resizing bounds, i.e. an area within which the resizing cursor can move.
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26 /// </summary>
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27 private Rect bounds;
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28
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29 /// <summary>
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30 /// Initial element size when resizing started.
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31 /// </summary>
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32 private Size initialSize;
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33
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34 /// <summary>
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35 /// Initial position of the element when resizing started.
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36 /// </summary>
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37 private Point initialPosition;
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38
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39 /// <summary>
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40 /// A corner or edge of the element used for resizing.
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41 /// </summary>
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42 private ResizeAnchor anchor;
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43
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44 /// <summary>
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45 /// An element implementing IResizableElement interface.
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46 /// </summary>
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47 private IResizableElement element;
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48
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49 /// <summary>
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50 /// Gets a framework element hosting resizing element.
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51 /// </summary>
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52 /// <value>The host.</value>
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53 private FrameworkElement Host
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54 {
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55 get
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56 {
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57 return element.Parent as FrameworkElement;
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58 }
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59 }
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60
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61 /// <summary>
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62 /// Gets a value indicating whether the resizing can be started.
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63 /// </summary>
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64 /// <value>
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65 /// <c>true</c> if resizing can be started; otherwise, <c>false</c>.
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66 /// </value>
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67 public bool CanResize
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68 {
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69 get
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70 {
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71 return anchor != ResizeAnchor.None;
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72 }
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73 }
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74
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75 /// <summary>
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76 /// Gets or sets the width of the resizing area.
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77 /// </summary>
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78 /// <value>The width of the resizing area. Default value is 6.</value>
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79 public double ResizingArea { get; set; }
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80
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81 /// <summary>
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82 /// Gets a value indicating whether this instance can be resized horizontally.
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83 /// </summary>
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84 /// <value>
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85 /// <c>true</c> if this instance can be resized horizontally; otherwise, <c>false</c>.
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86 /// </value>
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87 private bool CanResizeHorizontally
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88 {
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89 get
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90 {
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91 return !(element.MinWidth == element.MaxWidth && element.MinWidth != 0);
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92 }
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93 }
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94
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95 /// <summary>
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96 /// Gets a value indicating whether this instance can be resized vertically.
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97 /// </summary>
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98 /// <value>
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99 /// <c>true</c> if this instance can be resized vertically; otherwise, <c>false</c>.
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100 /// </value>
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101 private bool CanResizeVertically
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102 {
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103 get
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104 {
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105 return !(element.MinHeight == element.MaxHeight && element.MinHeight != 0);
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106 }
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107 }
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108
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109 /// <summary>
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110 /// Initializes a new instance of the <see cref="ResizeController"/> class.
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111 /// </summary>
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112 /// <param name="resizableElement">The resizable element.</param>
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113 public ResizeController(IResizableElement resizableElement)
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114 {
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115 if (resizableElement == null)
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116 throw new ArgumentNullException("resizableElement");
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117
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118 element = resizableElement;
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119 anchor = ResizeAnchor.None;
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120 ResizingArea = ResizingAreaDefaultValue;
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121 }
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122
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123 /// <summary>
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124 /// Starts resizing of the element.
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125 /// </summary>
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126 public void StartResizing()
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127 {
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128 initialSize = new Size(element.ActualWidth, element.ActualHeight);
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129 initialPosition = element.Position;
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130
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131 CalculateBoundsForResizing();
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132 }
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133
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134 /// <summary>
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135 /// Resizes the element.
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136 /// </summary>
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137 /// <param name="dx">Displacement by X-coordinate.</param>
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138 /// <param name="dy">Displacement by Y-coordinate.</param>
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139 public void Resize(double dx, double dy)
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140 {
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141 switch (anchor)
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142 {
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143 case ResizeAnchor.BottomRight:
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144 ResizeBottomRight(dx, dy);
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145 break;
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146
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147 case ResizeAnchor.Right:
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148 ResizeBottomRight(dx, 0);
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149 break;
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150
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151 case ResizeAnchor.Bottom:
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152 ResizeBottomRight(0, dy);
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153 break;
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154
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155 case ResizeAnchor.TopLeft:
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156 ResizeTopLeft(dx, dy);
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157 break;
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158
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159 case ResizeAnchor.Top:
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160 ResizeTopLeft(0, dy);
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161 break;
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162
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163 case ResizeAnchor.Left:
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164 ResizeTopLeft(dx, 0);
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165 break;
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166
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167 case ResizeAnchor.BottomLeft:
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168 ResizeBottomLeft(dx, dy);
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169 break;
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170
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171 case ResizeAnchor.TopRight:
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172 ResizeTopRight(dx, dy);
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173 break;
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174 }
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175 }
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176
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177 /// <summary>
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178 /// Determines resizing anchor and sets appropriate Cursor.
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179 /// </summary>
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180 /// <param name="p">Coordinates of the mouse pointer.</param>
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181 public void SetCursor(Point p)
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182 {
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183 if (p.Y < ResizingArea && p.X < ResizingArea)
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184 {
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185 anchor = ResizeAnchor.TopLeft;
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186 element.Cursor = Cursors.SizeNWSE;
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187 }
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188 else if (p.Y < ResizingArea && p.X >= (element.ActualWidth - ResizingArea))
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189 {
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190 anchor = ResizeAnchor.TopRight;
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191 element.Cursor = Cursors.SizeNESW;
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192 }
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193 else if (p.Y < ResizingArea)
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194 {
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195 if (CanResizeVertically)
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196 {
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197 anchor = ResizeAnchor.Top;
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198 element.Cursor = Cursors.SizeNS;
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199 }
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200 }
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201 else if (p.X < ResizingArea && p.Y >= (element.ActualHeight - ResizingArea))
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202 {
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203 anchor = ResizeAnchor.BottomLeft;
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204 element.Cursor = Cursors.SizeNESW;
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205 }
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206 else if (p.X < ResizingArea)
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207 {
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208 if (CanResizeHorizontally)
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209 {
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210 anchor = ResizeAnchor.Left;
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211 element.Cursor = Cursors.SizeWE;
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212 }
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213 }
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214 else if (p.X >= (element.ActualWidth - ResizingArea) && p.Y >= (element.ActualHeight - ResizingArea))
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215 {
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216 anchor = ResizeAnchor.BottomRight;
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217 element.Cursor = Cursors.SizeNWSE;
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218 }
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219 else if (p.X >= (element.ActualWidth - ResizingArea))
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220 {
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221 if (CanResizeHorizontally)
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222 {
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223 anchor = ResizeAnchor.Right;
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224 element.Cursor = Cursors.SizeWE;
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225 }
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226 }
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227 else if (p.Y >= (element.ActualHeight - ResizingArea))
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228 {
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229 if (CanResizeVertically)
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230 {
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231 anchor = ResizeAnchor.Bottom;
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232 element.Cursor = Cursors.SizeNS;
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233 }
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234 }
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235 else
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236 {
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237 anchor = ResizeAnchor.None;
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238 element.Cursor = null;
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239 }
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240 }
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241
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242 /// <summary>
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243 /// Calculates bounds for resizing.
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244 /// </summary>
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245 private void CalculateBoundsForResizing()
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246 {
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247 switch (anchor)
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248 {
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249 case ResizeAnchor.BottomRight:
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250 case ResizeAnchor.Right:
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251 case ResizeAnchor.Bottom:
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252 bounds = GetBoundsForLowerRightCorner();
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253 break;
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254
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255 case ResizeAnchor.TopLeft:
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256 case ResizeAnchor.Top:
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257 case ResizeAnchor.Left:
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258 bounds = GetBoundsForUpperLeftCorner();
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259 break;
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260
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261 case ResizeAnchor.BottomLeft:
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262 bounds = GetBoundsForLowerLeftCorner();
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263 break;
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264
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265 case ResizeAnchor.TopRight:
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266 bounds = GetBoundsForUpperRightCorner();
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267 break;
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268 }
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269 }
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270
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271 /// <summary>
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272 /// Calculates bounds for resizing by the lower right corner.
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273 /// </summary>
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274 /// <returns>Bounding rectangle.</returns>
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275 private Rect GetBoundsForLowerRightCorner()
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276 {
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277 double minWidth = (element.MinWidth != 0) ? element.MinWidth : MinResizedWidth;
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278 double minHeight = element.MinHeight;
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279
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280 double maxWidth = Host.ActualWidth - initialPosition.X;
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281
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282 if (!element.MaxWidth.IsNotSet() && element.MaxWidth > 0)
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283 maxWidth = Math.Min(maxWidth, element.MaxWidth);
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284
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285 double maxHeight = Host.ActualHeight - initialPosition.Y;
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286 if (!element.MaxHeight.IsNotSet() && element.MaxHeight > 0)
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287 maxHeight = Math.Min(maxHeight, element.MaxHeight);
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288
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289 Point p1 = initialPosition.Add(minWidth, minHeight);
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290 Point p2 = initialPosition.Add(maxWidth, maxHeight);
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291
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292 return new Rect(p1, p2);
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293 }
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294
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295 /// <summary>
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296 /// Calculates bounds for resizing by the upper left corner.
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297 /// </summary>
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298 /// <returns>Bounding rectangle.</returns>
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299 private Rect GetBoundsForUpperLeftCorner()
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300 {
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301 double minWidth = (element.MinWidth != 0) ? element.MinWidth : MinResizedWidth;
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302 double minHeight = element.MinHeight;
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303
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304 Point point = initialPosition.Add(initialSize);
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305 double maxWidth = point.X;
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306 double maxHeight = point.Y;
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307
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308 if (!element.MaxWidth.IsNotSet() && element.MaxWidth > 0)
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309 maxWidth = Math.Min(maxWidth, element.MaxWidth);
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310
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311 if (!element.MaxHeight.IsNotSet() && element.MaxHeight > 0)
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312 maxHeight = Math.Min(maxHeight, element.MaxHeight);
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313
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314 Point p1 = point.Add(-maxWidth, -maxHeight);
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315 Point p2 = point.Add(-minWidth, -minHeight);
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316
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317 return new Rect(p1, p2);
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318 }
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319
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320 /// <summary>
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321 /// Calculates bounds for resizing by the lower left corner.
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322 /// </summary>
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323 /// <returns>Bounding rectangle.</returns>
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324 private Rect GetBoundsForLowerLeftCorner()
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325 {
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326 double minWidth = (element.MinWidth != 0) ? element.MinWidth : MinResizedWidth;
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327 double minHeight = element.MinHeight;
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328
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329 Point point = initialPosition.Add(initialSize.Width, 0);
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330 double maxWidth = point.X;
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331
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332 if (!element.MaxWidth.IsNotSet() && element.MaxWidth > 0)
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333 maxWidth = Math.Min(maxWidth, element.MaxWidth);
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334
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335 double maxHeight = Host.ActualHeight - initialPosition.Y;
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336 if (!element.MaxHeight.IsNotSet() && element.MaxHeight > 0)
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337 maxHeight = Math.Min(maxHeight, element.MaxHeight);
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338
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339 Point p1 = point.Add(-maxWidth, minHeight);
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340 Point p2 = point.Add(-minWidth, maxHeight);
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341
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342 return new Rect(p1, p2);
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343 }
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344
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345 /// <summary>
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346 /// Calculates bounds for resizing by the upper right corner.
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347 /// </summary>
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348 /// <returns>Bounding rectangle.</returns>
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349 private Rect GetBoundsForUpperRightCorner()
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350 {
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351 double minWidth = (element.MinWidth != 0) ? element.MinWidth : MinResizedWidth;
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352 double minHeight = element.MinHeight;
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353
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354 Point point = initialPosition.Add(0, initialSize.Height);
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355 double maxWidth = Host.ActualWidth - initialPosition.X;
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356
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357 if (!element.MaxWidth.IsNotSet() && element.MaxWidth > 0)
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358 maxWidth = Math.Min(maxWidth, element.MaxWidth);
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359
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360 double maxHeight = point.Y;
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361 if (!element.MaxHeight.IsNotSet() && element.MaxHeight > 0)
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362 maxHeight = Math.Min(maxHeight, element.MaxHeight);
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363
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364 Point p1 = point.Add(minWidth, -maxHeight);
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365 Point p2 = point.Add(maxWidth, -minHeight);
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366
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367 return new Rect(p1, p2);
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368 }
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369
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370 /// <summary>
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371 /// Resizes the window by the bottom right corner of the window.
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372 /// </summary>
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373 /// <param name="dx">Increment by X-coordinate.</param>
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374 /// <param name="dy">Increment by Y-coordinate.</param>
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375 private void ResizeBottomRight(double dx, double dy)
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376 {
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377 Rect newBounds = new Rect(initialPosition, initialSize.Add(dx, dy));
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378 Point point = element.SnapinController.SnapBottomRightCorner(newBounds);
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379
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380 // If only one coordinate was changed - restore the other after snap in
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381 if (dx == 0)
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382 point.X = newBounds.BottomRight().X;
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383
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384 if (dy == 0)
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385 point.Y = newBounds.BottomRight().Y;
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386
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387 point = point.EnsureInBounds(bounds);
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388
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389 element.Width = point.X - initialPosition.X;
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390 element.Height = point.Y - initialPosition.Y;
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391 }
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392
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393 /// <summary>
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394 /// Resizes the window by the top left corner of the window.
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395 /// </summary>
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396 /// <param name="dx">Increment by X-coordinate.</param>
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397 /// <param name="dy">Increment by Y-coordinate.</param>
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398 private void ResizeTopLeft(double dx, double dy)
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399 {
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400 Rect newBounds = new Rect(initialPosition.Add(dx, dy), initialSize);
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401 Point point = element.SnapinController.SnapTopLeftCorner(newBounds).EnsureInBounds(bounds);
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402
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403 // If only one coordinate was changed - restore the other after snap in
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404 if (dx == 0)
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405 point.X = newBounds.Position().X;
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diff changeset
406
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407 if (dy == 0)
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408 point.Y = newBounds.Position().Y;
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409
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410 element.Position = point;
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411
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412 Point lowerRight = initialPosition.Add(initialSize);
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413 element.Width = lowerRight.X - point.X;
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414 element.Height = lowerRight.Y - point.Y;
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diff changeset
415 }
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416
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417 /// <summary>
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418 /// Resizes the window by the lower left corner of the window.
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419 /// </summary>
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420 /// <param name="dx">Increment by X-coordinate.</param>
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diff changeset
421 /// <param name="dy">Increment by Y-coordinate.</param>
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422 private void ResizeBottomLeft(double dx, double dy)
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423 {
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424 Rect newBounds = new Rect(initialPosition.Add(dx, 0), initialSize.Add(-dx, dy));
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diff changeset
425
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426 Point lowerLeft = element.SnapinController.SnapBottomLeftCorner(newBounds).EnsureInBounds(bounds);
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427 Point topLeft = new Point(lowerLeft.X, initialPosition.Y);
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diff changeset
428
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diff changeset
429 element.Position = topLeft;
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diff changeset
430
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diff changeset
431 element.Width = initialSize.Width + initialPosition.X - topLeft.X;
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432 element.Height = lowerLeft.Y - initialPosition.Y;
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433 }
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diff changeset
434
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Steven Hollidge <stevenhollidge@hotmail.com>
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diff changeset
435 /// <summary>
536498832a79 Latest version before changing bindings to Listbox
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
436 /// Resizes the window by the top right corner of the window.
536498832a79 Latest version before changing bindings to Listbox
Steven Hollidge <stevenhollidge@hotmail.com>
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diff changeset
437 /// </summary>
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diff changeset
438 /// <param name="dx">Increment by X-coordinate.</param>
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Steven Hollidge <stevenhollidge@hotmail.com>
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diff changeset
439 /// <param name="dy">Increment by Y-coordinate.</param>
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440 private void ResizeTopRight(double dx, double dy)
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diff changeset
441 {
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diff changeset
442 Rect newBounds = new Rect(initialPosition.Add(0, dy), initialSize.Add(dx, -dy));
536498832a79 Latest version before changing bindings to Listbox
Steven Hollidge <stevenhollidge@hotmail.com>
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diff changeset
443
536498832a79 Latest version before changing bindings to Listbox
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diff changeset
444 Point topRight = element.SnapinController.SnapTopRightCorner(newBounds).EnsureInBounds(bounds);
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diff changeset
445 Point topLeft = new Point(initialPosition.X, topRight.Y);
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diff changeset
446
536498832a79 Latest version before changing bindings to Listbox
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diff changeset
447 element.Position = topLeft;
536498832a79 Latest version before changing bindings to Listbox
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diff changeset
448
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diff changeset
449 element.Width = topRight.X - initialPosition.X;
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diff changeset
450 element.Height = initialSize.Height + initialPosition.Y - topRight.Y;
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diff changeset
451 }
536498832a79 Latest version before changing bindings to Listbox
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parents:
diff changeset
452 }
536498832a79 Latest version before changing bindings to Listbox
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diff changeset
453 }