Mercurial > projects > dwt-mac
annotate dwt/layout/FillLayout.d @ 3:649b8e223d5a
fix extends
author | Frank Benoit <benoit@tionex.de> |
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date | Wed, 27 Aug 2008 13:48:25 +0200 |
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children | 1a8b3cb347e0 |
rev | line source |
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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.FillLayout; |
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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 * <code>FillLayout</code> is the simplest layout class. It lays out |
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25 * controls in a single row or column, forcing them to be the same size. |
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26 * <p> |
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27 * Initially, the controls will all be as tall as the tallest control, |
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28 * and as wide as the widest. <code>FillLayout</code> does not wrap, |
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29 * but you can specify margins and spacing. You might use it to |
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30 * lay out buttons in a task bar or tool bar, or to stack checkboxes |
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31 * in a <code>Group</code>. <code>FillLayout</code> can also be used |
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32 * when a <code>Composite</code> only has one child. For example, |
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33 * if a <code>Shell</code> has a single <code>Group</code> child, |
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34 * <code>FillLayout</code> will cause the <code>Group</code> to |
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35 * completely fill the <code>Shell</code> (if margins are 0). |
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36 * </p> |
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37 * <p> |
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38 * Example code: first a <code>FillLayout</code> is created and |
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39 * its type field is set, and then the layout is set into the |
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40 * <code>Composite</code>. Note that in a <code>FillLayout</code>, |
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41 * children are always the same size, and they fill all available space. |
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42 * <pre> |
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43 * FillLayout fillLayout = new FillLayout(); |
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44 * fillLayout.type = DWT.VERTICAL; |
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45 * shell.setLayout(fillLayout); |
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46 * </pre> |
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47 * </p> |
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48 */ |
3 | 49 public final class FillLayout : Layout { |
0
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50 /** |
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51 * type specifies how controls will be positioned |
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52 * within the layout. |
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53 * |
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54 * The default value is HORIZONTAL. |
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55 * |
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56 * Possible values are: <ul> |
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57 * <li>HORIZONTAL: Position the controls horizontally from left to right</li> |
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58 * <li>VERTICAL: Position the controls vertically from top to bottom</li> |
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59 * </ul> |
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60 */ |
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61 public int type = DWT.HORIZONTAL; |
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62 |
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63 /** |
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64 * marginWidth specifies the number of pixels of horizontal margin |
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65 * that will be placed along the left and right edges of the layout. |
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66 * |
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67 * The default value is 0. |
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68 * |
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69 * @since 3.0 |
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70 */ |
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71 public int marginWidth = 0; |
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72 |
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73 /** |
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74 * marginHeight specifies the number of pixels of vertical margin |
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75 * that will be placed along the top and bottom edges of the layout. |
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76 * |
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77 * The default value is 0. |
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78 * |
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79 * @since 3.0 |
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80 */ |
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81 public int marginHeight = 0; |
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82 |
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83 /** |
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84 * spacing specifies the number of pixels between the edge of one cell |
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85 * and the edge of its neighbouring cell. |
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86 * |
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87 * The default value is 0. |
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88 * |
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89 * @since 3.0 |
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90 */ |
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91 public int spacing = 0; |
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92 |
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93 /** |
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94 * Constructs a new instance of this class. |
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95 */ |
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96 public FillLayout () { |
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97 } |
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98 |
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99 /** |
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100 * Constructs a new instance of this class given the type. |
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101 * |
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102 * @param type the type of fill layout |
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103 * |
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104 * @since 2.0 |
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105 */ |
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106 public FillLayout (int type) { |
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107 this.type = type; |
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108 } |
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109 |
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110 protected Point computeSize (Composite composite, int wHint, int hHint, bool flushCache) { |
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111 Control [] children = composite.getChildren (); |
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112 int count = children.length; |
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113 int maxWidth = 0, maxHeight = 0; |
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114 for (int i=0; i<count; i++) { |
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115 Control child = children [i]; |
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116 int w = wHint, h = hHint; |
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117 if (count > 0) { |
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118 if (type is DWT.HORIZONTAL && wHint !is DWT.DEFAULT) { |
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119 w = Math.max (0, (wHint - (count - 1) * spacing) / count); |
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120 } |
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121 if (type is DWT.VERTICAL && hHint !is DWT.DEFAULT) { |
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122 h = Math.max (0, (hHint - (count - 1) * spacing) / count); |
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123 } |
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124 } |
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125 Point size = computeChildSize (child, w, h, flushCache); |
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126 maxWidth = Math.max (maxWidth, size.x); |
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127 maxHeight = Math.max (maxHeight, size.y); |
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128 } |
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129 int width = 0, height = 0; |
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130 if (type is DWT.HORIZONTAL) { |
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131 width = count * maxWidth; |
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132 if (count !is 0) width += (count - 1) * spacing; |
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133 height = maxHeight; |
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134 } else { |
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135 width = maxWidth; |
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136 height = count * maxHeight; |
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137 if (count !is 0) height += (count - 1) * spacing; |
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138 } |
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139 width += marginWidth * 2; |
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140 height += marginHeight * 2; |
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141 if (wHint !is DWT.DEFAULT) width = wHint; |
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142 if (hHint !is DWT.DEFAULT) height = hHint; |
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143 return new Point (width, height); |
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144 } |
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145 |
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146 Point computeChildSize (Control control, int wHint, int hHint, bool flushCache) { |
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147 FillData data = (FillData)control.getLayoutData (); |
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148 if (data is null) { |
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149 data = new FillData (); |
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150 control.setLayoutData (data); |
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151 } |
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152 Point size = null; |
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153 if (wHint is DWT.DEFAULT && hHint is DWT.DEFAULT) { |
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154 size = data.computeSize (control, wHint, hHint, flushCache); |
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155 } else { |
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156 // TEMPORARY CODE |
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157 int trimX, trimY; |
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158 if (control instanceof Scrollable) { |
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159 Rectangle rect = ((Scrollable) control).computeTrim (0, 0, 0, 0); |
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160 trimX = rect.width; |
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161 trimY = rect.height; |
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162 } else { |
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163 trimX = trimY = control.getBorderWidth () * 2; |
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164 } |
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165 int w = wHint is DWT.DEFAULT ? wHint : Math.max (0, wHint - trimX); |
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166 int h = hHint is DWT.DEFAULT ? hHint : Math.max (0, hHint - trimY); |
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167 size = data.computeSize (control, w, h, flushCache); |
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168 } |
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169 return size; |
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170 } |
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171 |
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172 protected bool flushCache (Control control) { |
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173 Object data = control.getLayoutData(); |
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174 if (data !is null) ((FillData)data).flushCache(); |
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175 return true; |
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176 } |
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177 |
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178 String getName () { |
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179 String string = getClass ().getName (); |
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180 int index = string.lastIndexOf ('.'); |
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181 if (index is -1) return string; |
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182 return string.substring (index + 1, string.length ()); |
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183 } |
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184 |
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185 protected void layout (Composite composite, bool flushCache) { |
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186 Rectangle rect = composite.getClientArea (); |
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187 Control [] children = composite.getChildren (); |
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188 int count = children.length; |
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189 if (count is 0) return; |
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190 int width = rect.width - marginWidth * 2; |
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191 int height = rect.height - marginHeight * 2; |
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192 if (type is DWT.HORIZONTAL) { |
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193 width -= (count - 1) * spacing; |
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194 int x = rect.x + marginWidth, extra = width % count; |
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195 int y = rect.y + marginHeight, cellWidth = width / count; |
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196 for (int i=0; i<count; i++) { |
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197 Control child = children [i]; |
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198 int childWidth = cellWidth; |
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199 if (i is 0) { |
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200 childWidth += extra / 2; |
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201 } else { |
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202 if (i is count - 1) childWidth += (extra + 1) / 2; |
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203 } |
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204 child.setBounds (x, y, childWidth, height); |
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205 x += childWidth + spacing; |
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206 } |
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207 } else { |
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208 height -= (count - 1) * spacing; |
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209 int x = rect.x + marginWidth, cellHeight = height / count; |
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210 int y = rect.y + marginHeight, extra = height % count; |
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211 for (int i=0; i<count; i++) { |
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212 Control child = children [i]; |
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213 int childHeight = cellHeight; |
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214 if (i is 0) { |
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215 childHeight += extra / 2; |
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216 } else { |
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217 if (i is count - 1) childHeight += (extra + 1) / 2; |
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218 } |
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219 child.setBounds (x, y, width, childHeight); |
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220 y += childHeight + spacing; |
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221 } |
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222 } |
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223 } |
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224 |
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225 /** |
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226 * Returns a string containing a concise, human-readable |
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227 * description of the receiver. |
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228 * |
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229 * @return a string representation of the layout |
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230 */ |
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231 public String toString () { |
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232 String string = getName ()+" {"; |
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233 string += "type="+((type is DWT.VERTICAL) ? "DWT.VERTICAL" : "DWT.HORIZONTAL")+" "; |
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234 if (marginWidth !is 0) string += "marginWidth="+marginWidth+" "; |
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235 if (marginHeight !is 0) string += "marginHeight="+marginHeight+" "; |
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236 if (spacing !is 0) string += "spacing="+spacing+" "; |
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237 string = string.trim(); |
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238 string += "}"; |
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239 return string; |
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240 } |
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241 } |