Mercurial > projects > dwt-mac
annotate dwt/layout/FormLayout.d @ 7:e831403a80a9
Add 'cast' to casts
author | Frank Benoit <benoit@tionex.de> |
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date | Wed, 27 Aug 2008 14:30:35 +0200 |
parents | 1a8b3cb347e0 |
children | a9ab4c738ed8 |
rev | line source |
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1 /******************************************************************************* |
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2 * Copyright (c) 2000, 2007 IBM Corporation and others. |
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3 * All rights reserved. This program and the accompanying materials |
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4 * are made available under the terms of the Eclipse Public License v1.0 |
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5 * which accompanies this distribution, and is available at |
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6 * http://www.eclipse.org/legal/epl-v10.html |
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7 * |
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8 * Contributors: |
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9 * IBM Corporation - initial API and implementation |
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10 *******************************************************************************/ |
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11 module dwt.layout.FormLayout; |
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12 |
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13 import dwt.dwthelper.utils; |
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14 |
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15 import dwt.DWT; |
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16 import dwt.graphics.Point; |
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17 import dwt.graphics.Rectangle; |
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18 import dwt.widgets.Composite; |
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19 import dwt.widgets.Control; |
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20 import dwt.widgets.Layout; |
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21 import dwt.widgets.Scrollable; |
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22 |
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23 /** |
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24 * Instances of this class control the position and size of the |
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25 * children of a composite control by using <code>FormAttachments</code> |
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26 * to optionally configure the left, top, right and bottom edges of |
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27 * each child. |
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28 * <p> |
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29 * The following example code creates a <code>FormLayout</code> and then sets |
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30 * it into a <code>Shell</code>: |
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31 * <pre> |
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32 * Display display = new Display (); |
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33 * Shell shell = new Shell(display); |
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34 * FormLayout layout = new FormLayout(); |
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35 * layout.marginWidth = 3; |
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36 * layout.marginHeight = 3; |
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37 * shell.setLayout(layout); |
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38 * </pre> |
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39 * </p> |
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40 * <p> |
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41 * To use a <code>FormLayout</code>, create a <code>FormData</code> with |
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42 * <code>FormAttachment</code> for each child of <code>Composite</code>. |
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43 * The following example code attaches <code>button1</code> to the top |
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44 * and left edge of the composite and <code>button2</code> to the right |
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45 * edge of <code>button1</code> and the top and right edges of the |
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46 * composite: |
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47 * <pre> |
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48 * FormData data1 = new FormData(); |
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49 * data1.left = new FormAttachment(0, 0); |
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50 * data1.top = new FormAttachment(0, 0); |
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51 * button1.setLayoutData(data1); |
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52 * FormData data2 = new FormData(); |
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53 * data2.left = new FormAttachment(button1); |
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54 * data2.top = new FormAttachment(0, 0); |
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55 * data2.right = new FormAttachment(100, 0); |
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56 * button2.setLayoutData(data2); |
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57 * </pre> |
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58 * </p> |
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59 * <p> |
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60 * Each side of a child control can be attached to a position in the parent |
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61 * composite, or to other controls within the <code>Composite</code> by |
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62 * creating instances of <code>FormAttachment</code> and setting them into |
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63 * the top, bottom, left, and right fields of the child's <code>FormData</code>. |
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64 * </p> |
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65 * <p> |
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66 * If a side is not given an attachment, it is defined as not being attached |
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67 * to anything, causing the child to remain at its preferred size. If a child |
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68 * is given no attachment on either the left or the right or top or bottom, it is |
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69 * automatically attached to the left and top of the composite respectively. |
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70 * The following code positions <code>button1</code> and <code>button2</code> |
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71 * but relies on default attachments: |
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72 * <pre> |
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73 * FormData data2 = new FormData(); |
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74 * data2.left = new FormAttachment(button1); |
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75 * data2.right = new FormAttachment(100, 0); |
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76 * button2.setLayoutData(data2); |
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77 * </pre> |
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78 * </p> |
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79 * <p> |
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80 * IMPORTANT: Do not define circular attachments. For example, do not attach |
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81 * the right edge of <code>button1</code> to the left edge of <code>button2</code> |
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82 * and then attach the left edge of <code>button2</code> to the right edge of |
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83 * <code>button1</code>. This will over constrain the layout, causing undefined |
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84 * behavior. The algorithm will terminate, but the results are undefined. |
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85 * </p> |
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86 * |
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87 * @see FormData |
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88 * @see FormAttachment |
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89 * |
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90 * @since 2.0 |
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91 * |
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92 */ |
3 | 93 public final class FormLayout : Layout { |
0
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94 |
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95 /** |
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96 * marginWidth specifies the number of pixels of horizontal margin |
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97 * that will be placed along the left and right edges of the layout. |
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98 * |
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99 * The default value is 0. |
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100 */ |
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101 public int marginWidth = 0; |
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102 |
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103 /** |
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104 * marginHeight specifies the number of pixels of vertical margin |
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105 * that will be placed along the top and bottom edges of the layout. |
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106 * |
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107 * The default value is 0. |
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108 */ |
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109 public int marginHeight = 0; |
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110 |
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111 |
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112 /** |
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113 * marginLeft specifies the number of pixels of horizontal margin |
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114 * that will be placed along the left edge of the layout. |
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115 * |
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116 * The default value is 0. |
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117 * |
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118 * @since 3.1 |
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119 */ |
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120 public int marginLeft = 0; |
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121 |
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122 /** |
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123 * marginTop specifies the number of pixels of vertical margin |
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124 * that will be placed along the top edge of the layout. |
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125 * |
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126 * The default value is 0. |
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127 * |
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128 * @since 3.1 |
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129 */ |
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130 public int marginTop = 0; |
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131 |
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132 /** |
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133 * marginRight specifies the number of pixels of horizontal margin |
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134 * that will be placed along the right edge of the layout. |
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135 * |
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136 * The default value is 0. |
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137 * |
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138 * @since 3.1 |
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139 */ |
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140 public int marginRight = 0; |
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141 |
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142 /** |
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143 * marginBottom specifies the number of pixels of vertical margin |
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144 * that will be placed along the bottom edge of the layout. |
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145 * |
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146 * The default value is 0. |
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147 * |
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148 * @since 3.1 |
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149 */ |
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150 public int marginBottom = 0; |
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151 |
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152 /** |
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153 * spacing specifies the number of pixels between the edge of one control |
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154 * and the edge of its neighbouring control. |
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155 * |
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156 * The default value is 0. |
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157 * |
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158 * @since 3.0 |
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159 */ |
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160 public int spacing = 0; |
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161 |
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162 /** |
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163 * Constructs a new instance of this class. |
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164 */ |
5 | 165 public this () { |
0
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166 } |
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167 |
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168 /* |
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169 * Computes the preferred height of the form with |
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170 * respect to the preferred height of the control. |
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171 * |
7 | 172 * Given that the equations for top cast(T) and bottom cast(B) |
173 * of the control in terms of the height of the form cast(X) | |
0
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174 * are: |
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175 * T = AX + B |
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176 * B = CX + D |
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177 * |
7 | 178 * The equation for the height of the control cast(H) |
179 * is bottom cast(B) minus top cast(T) or (H = B - T) or: | |
0
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180 * |
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181 * H = (CX + D) - (AX + B) |
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182 * |
7 | 183 * Solving for cast(X), the height of the form, we get: |
0
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184 * |
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185 * X = (H + B - D) / (C - A) |
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186 * |
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187 * When (A = C), (C - A = 0) and the equation has no |
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188 * solution for X. This is a special case meaning that |
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189 * the control does not constrain the height of the |
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190 * form. In this case, we need to arbitrarily define |
7 | 191 * the height of the form cast(X): |
0
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192 * |
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193 * Case 1: A = C, A = 0, C = 0 |
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194 * |
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195 * Let X = D, the distance from the top of the form |
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196 * to the bottom edge of the control. In this case, |
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197 * the control was attached to the top of the form |
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198 * and the form needs to be large enough to show the |
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199 * bottom edge of the control. |
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200 * |
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201 * Case 2: A = C, A = 1, C = 1 |
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202 * |
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203 * Let X = -B, the distance from the bottom of the |
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204 * form to the top edge of the control. In this case, |
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205 * the control was attached to the bottom of the form |
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206 * and the only way that the control would be visible |
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207 * is if the offset is negative. If the offset is |
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208 * positive, there is no possible height for the form |
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209 * that will show the control as it will always be |
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210 * below the bottom edge of the form. |
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211 * |
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212 * Case 3: A = C, A !is 0, C !is 0 and A !is 1, C !is 0 |
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213 * |
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214 * Let X = D / (1 - C), the distance from the top of the |
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215 * form to the bottom edge of the control. In this case, |
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216 * since C is not 0 or 1, it must be a fraction, U / V. |
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217 * The offset D is the distance from CX to the bottom edge |
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218 * of the control. This represents a fraction of the form |
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219 * (1 - C)X. Since the height of a fraction of the form is |
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220 * known, the height of the entire form can be found by setting |
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221 * (1 - C)X = D. We solve this equation for X in terms of U |
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222 * and V, giving us X = (U * D) / (U - V). Similarly, if the |
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223 * offset D is negative, the control is positioned above CX. |
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224 * The offset -B is the distance from the top edge of the control |
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225 * to CX. We can find the height of the entire form by setting |
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226 * CX = -B. Solving in terms of U and V gives us X = (-B * V) / U. |
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227 */ |
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228 int computeHeight (Control control, FormData data, bool flushCache) { |
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229 FormAttachment top = data.getTopAttachment (control, spacing, flushCache); |
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230 FormAttachment bottom = data.getBottomAttachment (control, spacing, flushCache); |
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231 FormAttachment height = bottom.minus (top); |
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232 if (height.numerator is 0) { |
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233 if (bottom.numerator is 0) return bottom.offset; |
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234 if (bottom.numerator is bottom.denominator) return -top.offset; |
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235 if (bottom.offset <= 0) { |
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236 return -top.offset * top.denominator / bottom.numerator; |
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237 } |
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238 int divider = bottom.denominator - bottom.numerator; |
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239 return bottom.denominator * bottom.offset / divider; |
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240 } |
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241 return height.solveY (data.getHeight (control, flushCache)); |
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242 } |
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243 |
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244 protected Point computeSize (Composite composite, int wHint, int hHint, bool flushCache) { |
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245 Point size = layout (composite, false, 0, 0, wHint, hHint, flushCache); |
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246 if (wHint !is DWT.DEFAULT) size.x = wHint; |
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247 if (hHint !is DWT.DEFAULT) size.y = hHint; |
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248 return size; |
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249 } |
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250 |
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251 protected bool flushCache (Control control) { |
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252 Object data = control.getLayoutData (); |
7 | 253 if (data !is null) (cast(FormData) data).flushCache (); |
0
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254 return true; |
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255 } |
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256 |
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257 String getName () { |
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258 String string = getClass ().getName (); |
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259 int index = string.lastIndexOf ('.'); |
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260 if (index is -1) return string; |
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261 return string.substring (index + 1, string.length ()); |
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262 } |
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263 |
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264 /* |
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265 * Computes the preferred height of the form with |
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266 * respect to the preferred height of the control. |
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267 */ |
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268 int computeWidth (Control control, FormData data, bool flushCache) { |
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269 FormAttachment left = data.getLeftAttachment (control, spacing, flushCache); |
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270 FormAttachment right = data.getRightAttachment (control, spacing, flushCache); |
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271 FormAttachment width = right.minus (left); |
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272 if (width.numerator is 0) { |
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273 if (right.numerator is 0) return right.offset; |
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274 if (right.numerator is right.denominator) return -left.offset; |
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275 if (right.offset <= 0) { |
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276 return -left.offset * left.denominator / left.numerator; |
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277 } |
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278 int divider = right.denominator - right.numerator; |
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279 return right.denominator * right.offset / divider; |
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280 } |
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281 return width.solveY (data.getWidth (control, flushCache)); |
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282 } |
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283 |
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284 protected void layout (Composite composite, bool flushCache) { |
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285 Rectangle rect = composite.getClientArea (); |
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286 int x = rect.x + marginLeft + marginWidth; |
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287 int y = rect.y + marginTop + marginHeight; |
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288 int width = Math.max (0, rect.width - marginLeft - 2 * marginWidth - marginRight); |
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289 int height = Math.max (0, rect.height - marginTop - 2 * marginHeight - marginBottom); |
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290 layout (composite, true, x, y, width, height, flushCache); |
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291 } |
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292 |
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293 Point layout (Composite composite, bool move, int x, int y, int width, int height, bool flushCache) { |
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294 Control [] children = composite.getChildren (); |
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295 for (int i=0; i<children.length; i++) { |
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296 Control child = children [i]; |
7 | 297 FormData data = cast(FormData) child.getLayoutData (); |
0
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298 if (data is null) child.setLayoutData (data = new FormData ()); |
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299 if (flushCache) data.flushCache (); |
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300 data.cacheLeft = data.cacheRight = data.cacheTop = data.cacheBottom = null; |
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301 } |
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302 bool [] flush = null; |
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303 Rectangle [] bounds = null; |
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304 int w = 0, h = 0; |
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305 for (int i=0; i<children.length; i++) { |
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306 Control child = children [i]; |
7 | 307 FormData data = cast(FormData) child.getLayoutData (); |
0
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308 if (width !is DWT.DEFAULT) { |
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309 data.needed = false; |
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310 FormAttachment left = data.getLeftAttachment (child, spacing, flushCache); |
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311 FormAttachment right = data.getRightAttachment (child, spacing, flushCache); |
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312 int x1 = left.solveX (width), x2 = right.solveX (width); |
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313 if (data.height is DWT.DEFAULT && !data.needed) { |
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314 int trim = 0; |
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315 //TEMPORARY CODE |
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316 if (child instanceof Scrollable) { |
7 | 317 Rectangle rect = (cast(Scrollable) child).computeTrim (0, 0, 0, 0); |
0
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318 trim = rect.width; |
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319 } else { |
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320 trim = child.getBorderWidth () * 2; |
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321 } |
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322 data.cacheWidth = data.cacheHeight = -1; |
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323 int currentWidth = Math.max (0, x2 - x1 - trim); |
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324 data.computeSize (child, currentWidth, data.height, flushCache); |
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325 if (flush is null) flush = new bool [children.length]; |
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326 flush [i] = true; |
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327 } |
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328 w = Math.max (x2, w); |
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329 if (move) { |
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330 if (bounds is null) bounds = new Rectangle [children.length]; |
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331 bounds [i] = new Rectangle (0, 0, 0, 0); |
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332 bounds [i].x = x + x1; |
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333 bounds [i].width = x2 - x1; |
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334 } |
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335 } else { |
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336 w = Math.max (computeWidth (child, data, flushCache), w); |
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337 } |
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338 } |
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339 for (int i=0; i<children.length; i++) { |
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340 Control child = children [i]; |
7 | 341 FormData data = cast(FormData) child.getLayoutData (); |
0
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342 if (height !is DWT.DEFAULT) { |
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343 int y1 = data.getTopAttachment (child, spacing, flushCache).solveX (height); |
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344 int y2 = data.getBottomAttachment (child, spacing, flushCache).solveX (height); |
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345 h = Math.max (y2, h); |
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346 if (move) { |
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347 bounds [i].y = y + y1; |
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348 bounds [i].height = y2 - y1; |
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349 } |
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350 } else { |
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351 h = Math.max (computeHeight (child, data, flushCache), h); |
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352 } |
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353 } |
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354 for (int i=0; i<children.length; i++) { |
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355 Control child = children [i]; |
7 | 356 FormData data = cast(FormData) child.getLayoutData (); |
0
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357 if (flush !is null && flush [i]) data.cacheWidth = data.cacheHeight = -1; |
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358 data.cacheLeft = data.cacheRight = data.cacheTop = data.cacheBottom = null; |
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359 } |
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360 if (move) { |
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361 for (int i=0; i<children.length; i++) { |
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362 children [i].setBounds (bounds [i]); |
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363 } |
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364 } |
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365 w += marginLeft + marginWidth * 2 + marginRight; |
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366 h += marginTop + marginHeight * 2 + marginBottom; |
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367 return new Point (w, h); |
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368 } |
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369 |
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370 /** |
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371 * Returns a string containing a concise, human-readable |
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372 * description of the receiver. |
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373 * |
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374 * @return a string representation of the layout |
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375 */ |
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376 public String toString () { |
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377 String string = getName ()+" {"; |
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378 if (marginWidth !is 0) string += "marginWidth="+marginWidth+" "; |
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379 if (marginHeight !is 0) string += "marginHeight="+marginHeight+" "; |
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380 if (marginLeft !is 0) string += "marginLeft="+marginLeft+" "; |
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381 if (marginRight !is 0) string += "marginRight="+marginRight+" "; |
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382 if (marginTop !is 0) string += "marginTop="+marginTop+" "; |
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383 if (marginBottom !is 0) string += "marginBottom="+marginBottom+" "; |
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384 if (spacing !is 0) string += "spacing="+spacing+" "; |
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385 string = string.trim(); |
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386 string += "}"; |
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387 return string; |
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388 } |
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389 } |