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annotate SilverlightGlimpse/SilverFlow.Controls/Controllers/SnapinController.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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1 using System.Collections.Generic;
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2 using System.Windows;
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3 using SilverFlow.Controls.Extensions;
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4 using SilverFlow.Geometry;
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5
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6 namespace SilverFlow.Controls.Controllers
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7 {
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8 /// <summary>
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9 /// Provides helpers methods for calculating window position
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10 /// during movement and resizing.
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11 /// </summary>
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12 public class SnapinController : ISnapinController
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13 {
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14 /// <summary>
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15 /// Distance on which snapping works.
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16 /// </summary>
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17 private const double SnapinDistanceDefaultValue = 5;
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18
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19 /// <summary>
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20 /// Gets or sets a value indicating whether snap in is enabled.
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21 /// </summary>
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22 /// <value><c>true</c> if snap in is enabled; otherwise, <c>false</c>.</value>
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23 public bool SnapinEnabled { get; set; }
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24
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25 /// <summary>
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26 /// Gets or sets snap in bounds.
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27 /// </summary>
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28 /// <value>Snap in bounds.</value>
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29 public IEnumerable<Rect> SnapinBounds { get; set; }
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30
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31 /// <summary>
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32 /// Gets or sets snap in distance.
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33 /// </summary>
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34 /// <value>Snap in distance.</value>
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35 public double SnapinDistance { get; set; }
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36
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37 /// <summary>
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38 /// Gets or sets a value snap in margin - distance between adjacent edges.
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39 /// </summary>
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40 /// <value>Snap in margin.</value>
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41 public double SnapinMargin { get; set; }
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42
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43 /// <summary>
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44 /// Gets calculations accuracy.
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45 /// </summary>
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46 /// <value>Accuracy.</value>
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47 private double Accuracy
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48 {
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49 get { return SnapinDistance + SnapinMargin; }
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50 }
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51
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52 /// <summary>
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53 /// Returns new position of the specified rectangle
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54 /// taking into account bounds the rectangle can be attracted to.
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55 /// </summary>
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56 /// <param name="rect">The rectangle.</param>
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57 /// <returns>New position.</returns>
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58 public Point SnapRectangle(Rect rect)
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59 {
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60 Point point = rect.Position();
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61
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62 if (SnapinEnabled)
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63 {
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64 Distance minDistance = new Distance();
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65 foreach (var bound in SnapinBounds)
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66 {
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67 Distance distance = DistanceBetweenRectangles(rect, bound);
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68 minDistance = Distance.Min(distance, minDistance);
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69 }
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70
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71 point = point.Add(minDistance);
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72 }
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73
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74 return point;
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75 }
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76
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77 /// <summary>
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78 /// Snaps the bottom right corner of the specified rectangle to the nearest bounds.
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79 /// </summary>
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80 /// <param name="rect">The rectangle.</param>
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81 /// <returns>New position.</returns>
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82 public Point SnapBottomRightCorner(Rect rect)
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83 {
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84 Point point = rect.BottomRight();
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85
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86 if (SnapinEnabled)
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87 {
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88 Distance minDistance = new Distance();
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89 foreach (var bound in SnapinBounds)
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90 {
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91 Distance distance = new Distance()
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92 {
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93 X = DistanceBetweenRightEdgeAndRectangle(rect, bound),
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94 Y = DistanceBetweenBottomEdgeAndRectangle(rect, bound)
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95 };
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96
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97 minDistance = Distance.Min(distance, minDistance);
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98 }
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99
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100 point = point.Add(minDistance);
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101 }
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102
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103 return point;
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104 }
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105
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106 /// <summary>
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107 /// Snaps the upper left corner of the specified rectangle to the nearest bounds.
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108 /// </summary>
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109 /// <param name="rect">The rectangle.</param>
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110 /// <returns>New position.</returns>
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111 public Point SnapTopLeftCorner(Rect rect)
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112 {
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113 Point point = rect.Position();
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114
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115 if (SnapinEnabled)
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116 {
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117 Distance minDistance = new Distance();
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118 foreach (var bound in SnapinBounds)
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119 {
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120 Distance distance = new Distance()
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121 {
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122 X = DistanceBetweenLeftEdgeAndRectangle(rect, bound),
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123 Y = DistanceBetweenTopEdgeAndRectangle(rect, bound)
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124 };
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125
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126 minDistance = Distance.Min(distance, minDistance);
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127 }
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128
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129 point = point.Add(minDistance);
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130 }
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131
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132 return point;
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133 }
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134
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135 /// <summary>
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136 /// Snaps the lower left corner of the specified rectangle to the nearest bounds.
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137 /// </summary>
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138 /// <param name="rect">The rectangle.</param>
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139 /// <returns>New position.</returns>
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140 public Point SnapBottomLeftCorner(Rect rect)
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141 {
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142 Point point = rect.BottomLeft();
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143
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144 if (SnapinEnabled)
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145 {
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146 Distance minDistance = new Distance();
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147 foreach (var bound in SnapinBounds)
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148 {
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149 Distance distance = new Distance()
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150 {
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151 X = DistanceBetweenLeftEdgeAndRectangle(rect, bound),
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152 Y = DistanceBetweenBottomEdgeAndRectangle(rect, bound)
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153 };
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154
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155 minDistance = Distance.Min(distance, minDistance);
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156 }
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157
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158 point = point.Add(minDistance);
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159 }
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160
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161 return point;
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162 }
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163
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164 /// <summary>
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165 /// Snaps the upper right corner of the specified rectangle to the nearest bounds.
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166 /// </summary>
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167 /// <param name="rect">The rectangle.</param>
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168 /// <returns>New position.</returns>
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169 public Point SnapTopRightCorner(Rect rect)
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170 {
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171 Point point = rect.TopRight();
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172
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173 if (SnapinEnabled)
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174 {
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175 Distance minDistance = new Distance();
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176 foreach (var bound in SnapinBounds)
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177 {
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178 Distance distance = new Distance()
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179 {
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180 X = DistanceBetweenRightEdgeAndRectangle(rect, bound),
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181 Y = DistanceBetweenTopEdgeAndRectangle(rect, bound)
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182 };
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183
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184 minDistance = Distance.Min(distance, minDistance);
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185 }
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186
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187 point = point.Add(minDistance);
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188 }
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189
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190 return point;
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191 }
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192
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193 /// <summary>
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194 /// Returns mininal distance between two rectangles.
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195 /// </summary>
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196 /// <param name="first">First rectangle.</param>
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197 /// <param name="second">Second rectangle.</param>
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198 /// <returns>Minimal distance.</returns>
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199 private Distance DistanceBetweenRectangles(Rect first, Rect second)
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200 {
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201 double x1 = DistanceBetweenRightEdgeAndRectangle(first, second);
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202 double x2 = DistanceBetweenLeftEdgeAndRectangle(first, second);
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203 double y1 = DistanceBetweenBottomEdgeAndRectangle(first, second);
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204 double y2 = DistanceBetweenTopEdgeAndRectangle(first, second);
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205
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206 Distance distance = new Distance()
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207 {
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208 X = MathExtensions.AbsMin(x1, x2),
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209 Y = MathExtensions.AbsMin(y1, y2)
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210 };
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211
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212 return distance;
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213 }
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214
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215 /// <summary>
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216 /// Returns distance between the right edge of the rectangle and another rectangle.
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217 /// </summary>
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218 /// <param name="first">First rectangle.</param>
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219 /// <param name="second">Second rectangle.</param>
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220 /// <returns>Minimal distance.</returns>
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221 private double DistanceBetweenRightEdgeAndRectangle(Rect first, Rect second)
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222 {
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223 double snap;
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224 double distance = double.NaN;
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225 double x = first.X + first.Width - 1;
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226
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227 if (first.OverlapsVertically(second, Accuracy))
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228 {
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229 snap = second.X - 1 - SnapinMargin;
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230 if (x.IsNear(snap, SnapinDistance))
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231 {
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232 distance = MathExtensions.AbsMin(snap - x, distance);
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233 }
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234
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235 snap = second.X + second.Width - 1;
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236 if (x.IsNear(snap, SnapinDistance))
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237 {
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238 distance = MathExtensions.AbsMin(snap - x, distance);
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239 }
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240 }
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241
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242 return distance;
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243 }
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244
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245 /// <summary>
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246 /// Returns distance between the left edge of the rectangle and another rectangle.
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247 /// </summary>
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248 /// <param name="first">First rectangle.</param>
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249 /// <param name="second">Second rectangle.</param>
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250 /// <returns>Minimal distance.</returns>
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251 private double DistanceBetweenLeftEdgeAndRectangle(Rect first, Rect second)
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252 {
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253 double snap;
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254 double distance = double.NaN;
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255
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256 if (first.OverlapsVertically(second, Accuracy))
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257 {
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258 snap = second.X;
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259 if (first.X.IsNear(snap, SnapinDistance))
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260 {
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261 distance = MathExtensions.AbsMin(snap - first.X, distance);
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262 }
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263
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264 snap = second.X + second.Width + SnapinMargin;
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265 if (first.X.IsNear(snap, SnapinDistance))
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266 {
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267 distance = MathExtensions.AbsMin(snap - first.X, distance);
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268 }
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269 }
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270
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271 return distance;
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272 }
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273
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274 /// <summary>
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275 /// Returns distance between the bottom edge of the rectangle and another rectangle.
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276 /// </summary>
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277 /// <param name="first">First rectangle.</param>
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278 /// <param name="second">Second rectangle.</param>
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279 /// <returns>Minimal distance.</returns>
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280 private double DistanceBetweenBottomEdgeAndRectangle(Rect first, Rect second)
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281 {
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282 double snap;
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283 double distance = double.NaN;
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284 double y = first.Y + first.Height - 1;
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285
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286 if (first.OverlapsHorizontally(second, Accuracy))
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287 {
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288 snap = second.Y - 1 - SnapinMargin;
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289 if (y.IsNear(snap, SnapinDistance))
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290 {
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291 distance = MathExtensions.AbsMin(snap - y, distance);
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292 }
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293
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294 snap = second.Y + second.Height - 1;
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295 if (y.IsNear(snap, SnapinDistance))
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296 {
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297 distance = MathExtensions.AbsMin(snap - y, distance);
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298 }
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299 }
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300
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301 return distance;
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302 }
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303
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304 /// <summary>
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305 /// Returns distance between the top edge of the rectangle and another rectangle.
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306 /// </summary>
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307 /// <param name="first">First rectangle.</param>
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308 /// <param name="second">Second rectangle.</param>
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309 /// <returns>Minimal distance.</returns>
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310 private double DistanceBetweenTopEdgeAndRectangle(Rect first, Rect second)
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311 {
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312 double snap;
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313 double distance = double.NaN;
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314
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315 if (first.OverlapsHorizontally(second, Accuracy))
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316 {
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317 snap = second.Y;
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318 if (first.Y.IsNear(snap, SnapinDistance))
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319 {
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320 distance = MathExtensions.AbsMin(snap - first.Y, distance);
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321 }
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322
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323 snap = second.Y + second.Height + SnapinMargin;
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324 if (first.Y.IsNear(snap, SnapinDistance))
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325 {
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326 distance = MathExtensions.AbsMin(snap - first.Y, distance);
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327 }
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328 }
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329
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330 return distance;
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331 }
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332 }
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333 }