Mercurial > projects > dwt-mac
annotate dwt/layout/FormData.d @ 0:380af2bdd8e5
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author | Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com> |
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date | Sat, 09 Aug 2008 17:00:02 +0200 |
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children | 1a8b3cb347e0 |
rev | line source |
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0
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1 /******************************************************************************* |
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2 * Copyright (c) 2000, 2006 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.FormData; |
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12 |
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13 import dwt.dwthelper.utils; |
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14 |
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15 |
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16 import dwt.DWT; |
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17 import dwt.graphics.Point; |
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18 import dwt.widgets.Control; |
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19 |
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20 /** |
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21 * Instances of this class are used to define the attachments |
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22 * of a control in a <code>FormLayout</code>. |
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23 * <p> |
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24 * To set a <code>FormData</code> object into a control, you use the |
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25 * <code>setLayoutData ()</code> method. To define attachments for the |
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26 * <code>FormData</code>, set the fields directly, like this: |
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27 * <pre> |
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28 * FormData data = new FormData(); |
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29 * data.left = new FormAttachment(0,5); |
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30 * data.right = new FormAttachment(100,-5); |
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31 * button.setLayoutData(formData); |
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32 * </pre> |
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33 * </p> |
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34 * <p> |
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35 * <code>FormData</code> contains the <code>FormAttachments</code> for |
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36 * each edge of the control that the <code>FormLayout</code> uses to |
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37 * determine the size and position of the control. <code>FormData</code> |
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38 * objects also allow you to set the width and height of controls within |
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39 * a <code>FormLayout</code>. |
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40 * </p> |
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41 * |
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42 * @see FormLayout |
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43 * @see FormAttachment |
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44 * |
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45 * @since 2.0 |
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46 */ |
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47 public final class FormData { |
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48 /** |
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49 * width specifies the preferred width in pixels. This value |
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50 * is the wHint passed into Control.computeSize(int, int, bool) |
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51 * to determine the preferred size of the control. |
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52 * |
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53 * The default value is DWT.DEFAULT. |
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54 * |
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55 * @see Control#computeSize(int, int, bool) |
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56 */ |
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57 public int width = DWT.DEFAULT; |
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58 /** |
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59 * height specifies the preferred height in pixels. This value |
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60 * is the hHint passed into Control.computeSize(int, int, bool) |
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61 * to determine the preferred size of the control. |
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62 * |
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63 * The default value is DWT.DEFAULT. |
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64 * |
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65 * @see Control#computeSize(int, int, bool) |
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66 */ |
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67 public int height = DWT.DEFAULT; |
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68 /** |
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69 * left specifies the attachment of the left side of |
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70 * the control. |
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71 */ |
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72 public FormAttachment left; |
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73 /** |
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74 * right specifies the attachment of the right side of |
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75 * the control. |
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76 */ |
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77 public FormAttachment right; |
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78 /** |
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79 * top specifies the attachment of the top of the control. |
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80 */ |
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81 public FormAttachment top; |
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82 /** |
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83 * bottom specifies the attachment of the bottom of the |
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84 * control. |
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85 */ |
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86 public FormAttachment bottom; |
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87 |
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88 int cacheWidth = -1, cacheHeight = -1; |
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89 int defaultWhint, defaultHhint, defaultWidth = -1, defaultHeight = -1; |
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90 int currentWhint, currentHhint, currentWidth = -1, currentHeight = -1; |
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91 FormAttachment cacheLeft, cacheRight, cacheTop, cacheBottom; |
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92 bool isVisited, needed; |
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93 |
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94 /** |
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95 * Constructs a new instance of FormData using |
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96 * default values. |
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97 */ |
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98 public FormData () { |
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99 } |
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100 |
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101 /** |
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102 * Constructs a new instance of FormData according to the parameters. |
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103 * A value of DWT.DEFAULT indicates that no minimum width or |
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104 * no minimum height is specified. |
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105 * |
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106 * @param width a minimum width for the control |
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107 * @param height a minimum height for the control |
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108 */ |
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109 public FormData (int width, int height) { |
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110 this.width = width; |
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111 this.height = height; |
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112 } |
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113 |
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114 void computeSize (Control control, int wHint, int hHint, bool flushCache) { |
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115 if (cacheWidth !is -1 && cacheHeight !is -1) return; |
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116 if (wHint is this.width && hHint is this.height) { |
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117 if (defaultWidth is -1 || defaultHeight is -1 || wHint !is defaultWhint || hHint !is defaultHhint) { |
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118 Point size = control.computeSize (wHint, hHint, flushCache); |
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119 defaultWhint = wHint; |
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120 defaultHhint = hHint; |
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121 defaultWidth = size.x; |
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122 defaultHeight = size.y; |
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123 } |
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124 cacheWidth = defaultWidth; |
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125 cacheHeight = defaultHeight; |
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126 return; |
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127 } |
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128 if (currentWidth is -1 || currentHeight is -1 || wHint !is currentWhint || hHint !is currentHhint) { |
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129 Point size = control.computeSize (wHint, hHint, flushCache); |
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130 currentWhint = wHint; |
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131 currentHhint = hHint; |
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132 currentWidth = size.x; |
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133 currentHeight = size.y; |
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134 } |
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135 cacheWidth = currentWidth; |
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136 cacheHeight = currentHeight; |
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137 } |
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138 |
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139 void flushCache () { |
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140 cacheWidth = cacheHeight = -1; |
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141 defaultHeight = defaultWidth = -1; |
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142 currentHeight = currentWidth = -1; |
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143 } |
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144 |
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145 int getWidth (Control control, bool flushCache) { |
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146 needed = true; |
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147 computeSize (control, width, height, flushCache); |
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148 return cacheWidth; |
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149 } |
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150 |
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151 int getHeight (Control control, bool flushCache) { |
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152 computeSize (control, width, height, flushCache); |
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153 return cacheHeight; |
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154 } |
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155 |
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156 FormAttachment getBottomAttachment (Control control, int spacing, bool flushCache) { |
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157 if (cacheBottom !is null) return cacheBottom; |
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158 if (isVisited) return cacheBottom = new FormAttachment (0, getHeight (control, flushCache)); |
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159 if (bottom is null) { |
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160 if (top is null) return cacheBottom = new FormAttachment (0, getHeight (control, flushCache)); |
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161 return cacheBottom = getTopAttachment (control, spacing, flushCache).plus (getHeight (control, flushCache)); |
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162 } |
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163 Control bottomControl = bottom.control; |
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164 if (bottomControl !is null) { |
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165 if (bottomControl.isDisposed ()) { |
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166 bottom.control = bottomControl = null; |
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167 } else { |
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168 if (bottomControl.getParent () !is control.getParent ()) { |
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169 bottomControl = null; |
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170 } |
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171 } |
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172 } |
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173 if (bottomControl is null) return cacheBottom = bottom; |
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174 isVisited = true; |
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175 FormData bottomData = (FormData) bottomControl.getLayoutData (); |
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176 FormAttachment bottomAttachment = bottomData.getBottomAttachment (bottomControl, spacing, flushCache); |
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177 switch (bottom.alignment) { |
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178 case DWT.BOTTOM: |
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179 cacheBottom = bottomAttachment.plus (bottom.offset); |
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180 break; |
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181 case DWT.CENTER: { |
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182 FormAttachment topAttachment = bottomData.getTopAttachment (bottomControl, spacing, flushCache); |
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183 FormAttachment bottomHeight = bottomAttachment.minus (topAttachment); |
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184 cacheBottom = bottomAttachment.minus (bottomHeight.minus (getHeight (control, flushCache)).divide (2)); |
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185 break; |
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186 } |
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187 default: { |
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188 FormAttachment topAttachment = bottomData.getTopAttachment (bottomControl, spacing, flushCache); |
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189 cacheBottom = topAttachment.plus (bottom.offset - spacing); |
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190 break; |
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191 } |
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192 } |
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193 isVisited = false; |
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194 return cacheBottom; |
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195 } |
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196 |
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197 FormAttachment getLeftAttachment (Control control, int spacing, bool flushCache) { |
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198 if (cacheLeft !is null) return cacheLeft; |
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199 if (isVisited) return cacheLeft = new FormAttachment (0, 0); |
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200 if (left is null) { |
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201 if (right is null) return cacheLeft = new FormAttachment (0, 0); |
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202 return cacheLeft = getRightAttachment (control, spacing, flushCache).minus (getWidth (control, flushCache)); |
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203 } |
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204 Control leftControl = left.control; |
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205 if (leftControl !is null) { |
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206 if (leftControl.isDisposed ()) { |
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207 left.control = leftControl = null; |
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208 } else { |
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209 if (leftControl.getParent () !is control.getParent ()) { |
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210 leftControl = null; |
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211 } |
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212 } |
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213 } |
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214 if (leftControl is null) return cacheLeft = left; |
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215 isVisited = true; |
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216 FormData leftData = (FormData) leftControl.getLayoutData (); |
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217 FormAttachment leftAttachment = leftData.getLeftAttachment (leftControl, spacing, flushCache); |
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218 switch (left.alignment) { |
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219 case DWT.LEFT: |
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220 cacheLeft = leftAttachment.plus (left.offset); |
380af2bdd8e5
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221 break; |
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parents:
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|
222 case DWT.CENTER: { |
380af2bdd8e5
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223 FormAttachment rightAttachment = leftData.getRightAttachment (leftControl, spacing, flushCache); |
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224 FormAttachment leftWidth = rightAttachment.minus (leftAttachment); |
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225 cacheLeft = leftAttachment.plus (leftWidth.minus (getWidth (control, flushCache)).divide (2)); |
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226 break; |
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227 } |
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228 default: { |
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229 FormAttachment rightAttachment = leftData.getRightAttachment (leftControl, spacing, flushCache); |
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230 cacheLeft = rightAttachment.plus (left.offset + spacing); |
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231 } |
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232 } |
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233 isVisited = false; |
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234 return cacheLeft; |
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235 } |
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236 |
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237 String getName () { |
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238 String string = getClass ().getName (); |
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239 int index = string.lastIndexOf ('.'); |
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240 if (index is -1) return string; |
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241 return string.substring (index + 1, string.length ()); |
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242 } |
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243 |
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244 FormAttachment getRightAttachment (Control control, int spacing, bool flushCache) { |
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245 if (cacheRight !is null) return cacheRight; |
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246 if (isVisited) return cacheRight = new FormAttachment (0, getWidth (control, flushCache)); |
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247 if (right is null) { |
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248 if (left is null) return cacheRight = new FormAttachment (0, getWidth (control, flushCache)); |
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249 return cacheRight = getLeftAttachment (control, spacing, flushCache).plus (getWidth (control, flushCache)); |
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250 } |
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251 Control rightControl = right.control; |
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252 if (rightControl !is null) { |
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253 if (rightControl.isDisposed ()) { |
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254 right.control = rightControl = null; |
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255 } else { |
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256 if (rightControl.getParent () !is control.getParent ()) { |
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257 rightControl = null; |
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258 } |
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259 } |
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260 } |
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261 if (rightControl is null) return cacheRight = right; |
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262 isVisited = true; |
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263 FormData rightData = (FormData) rightControl.getLayoutData (); |
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264 FormAttachment rightAttachment = rightData.getRightAttachment (rightControl, spacing, flushCache); |
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265 switch (right.alignment) { |
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266 case DWT.RIGHT: |
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267 cacheRight = rightAttachment.plus (right.offset); |
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268 break; |
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269 case DWT.CENTER: { |
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270 FormAttachment leftAttachment = rightData.getLeftAttachment (rightControl, spacing, flushCache); |
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271 FormAttachment rightWidth = rightAttachment.minus (leftAttachment); |
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272 cacheRight = rightAttachment.minus (rightWidth.minus (getWidth (control, flushCache)).divide (2)); |
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273 break; |
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274 } |
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275 default: { |
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276 FormAttachment leftAttachment = rightData.getLeftAttachment (rightControl, spacing, flushCache); |
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277 cacheRight = leftAttachment.plus (right.offset - spacing); |
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278 break; |
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279 } |
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280 } |
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281 isVisited = false; |
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282 return cacheRight; |
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283 } |
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284 |
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285 FormAttachment getTopAttachment (Control control, int spacing, bool flushCache) { |
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286 if (cacheTop !is null) return cacheTop; |
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287 if (isVisited) return cacheTop = new FormAttachment (0, 0); |
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288 if (top is null) { |
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289 if (bottom is null) return cacheTop = new FormAttachment (0, 0); |
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290 return cacheTop = getBottomAttachment (control, spacing, flushCache).minus (getHeight (control, flushCache)); |
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291 } |
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292 Control topControl = top.control; |
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293 if (topControl !is null) { |
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294 if (topControl.isDisposed ()) { |
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295 top.control = topControl = null; |
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296 } else { |
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297 if (topControl.getParent () !is control.getParent ()) { |
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298 topControl = null; |
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299 } |
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300 } |
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301 } |
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302 if (topControl is null) return cacheTop = top; |
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303 isVisited = true; |
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304 FormData topData = (FormData) topControl.getLayoutData (); |
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305 FormAttachment topAttachment = topData.getTopAttachment (topControl, spacing, flushCache); |
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306 switch (top.alignment) { |
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307 case DWT.TOP: |
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308 cacheTop = topAttachment.plus (top.offset); |
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309 break; |
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310 case DWT.CENTER: { |
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311 FormAttachment bottomAttachment = topData.getBottomAttachment (topControl, spacing, flushCache); |
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312 FormAttachment topHeight = bottomAttachment.minus (topAttachment); |
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313 cacheTop = topAttachment.plus (topHeight.minus (getHeight (control, flushCache)).divide (2)); |
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314 break; |
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315 } |
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316 default: { |
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317 FormAttachment bottomAttachment = topData.getBottomAttachment (topControl, spacing, flushCache); |
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318 cacheTop = bottomAttachment.plus (top.offset + spacing); |
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319 break; |
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320 } |
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321 } |
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322 isVisited = false; |
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323 return cacheTop; |
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324 } |
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325 |
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326 /** |
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327 * Returns a string containing a concise, human-readable |
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328 * description of the receiver. |
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329 * |
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330 * @return a string representation of the FormData object |
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331 */ |
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332 public String toString () { |
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333 String string = getName()+" {"; |
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334 if (width !is DWT.DEFAULT) string += "width="+width+" "; |
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335 if (height !is DWT.DEFAULT) string += "height="+height+" "; |
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336 if (left !is null) string += "left="+left+" "; |
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337 if (right !is null) string += "right="+right+" "; |
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338 if (top !is null) string += "top="+top+" "; |
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339 if (bottom !is null) string += "bottom="+bottom+" "; |
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340 string = string.trim(); |
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341 string += "}"; |
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342 return string; |
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343 } |
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344 |
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345 } |