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annotate org.eclipse.draw2d/src/org/eclipse/draw2d/ToolbarLayout.d @ 12:bc29606a740c

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Added dwt-addons in original directory structure of eclipse.org
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:23:29 +0100
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children dbfb303e8fb0
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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 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module org.eclipse.draw2d.ToolbarLayout;
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14
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15 import java.lang.all;
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16
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17 import org.eclipse.draw2d.geometry.Dimension;
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18 import org.eclipse.draw2d.geometry.Insets;
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19 import org.eclipse.draw2d.geometry.Rectangle;
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20 import org.eclipse.draw2d.geometry.Transposer;
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21 import org.eclipse.draw2d.AbstractHintLayout;
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22 import org.eclipse.draw2d.IFigure;
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23
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24 /**
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25 * Arranges figures in a single row or column. Orientation can be set to produce either
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26 * a row or column layout. This layout tries to fit all children within the parent's
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27 * client area. To do this, it compresses the children by some amount, but will not
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28 * compress them smaller than their minimum size. If a child's preferred size is smaller
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29 * than the row's or column's minor dimension, the layout can be configured to stretch the
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30 * child.
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31 */
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32 public class ToolbarLayout
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33 : AbstractHintLayout
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34 {
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35
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36 /** Space in pixels between Figures **/
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37 protected int spacing;
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38 /** Sets whether children should "stretch" with their container **/
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39 protected bool matchWidth;
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40 /** Orientation of layout **/
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41 protected bool horizontal = false;
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42 /** Alignment of layout **/
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43 protected int minorAlignment;
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44
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45 /** Constant for center alignment **/
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46 public static const int ALIGN_CENTER = 0;
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47 /** Constant for top-left alignment **/
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48 public static const int ALIGN_TOPLEFT = 1;
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49 /** Constant for bottom-right alignment **/
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50 public static const int ALIGN_BOTTOMRIGHT = 2;
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51
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52 /** Constant for horizontal alignment **/
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53 public static const bool HORIZONTAL = true;
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54 /** Constant for vertical alignment **/
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55 public static const bool VERTICAL = false;
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56
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57 /** Transposer object used in layout calculations **/
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58 protected Transposer transposer;
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59 private void instanceInit() {
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60 transposer = new Transposer();
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61 transposer.setEnabled(horizontal);
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62 }
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63
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64 /**
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65 * Constructs a vertically oriented ToolbarLayout with child spacing of 0 pixels,
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66 * matchWidth <code>true</code>, and {@link #ALIGN_TOPLEFT} alignment.
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67 *
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68 * @since 2.0
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69 */
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70 public this() {
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71 instanceInit();
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72 spacing = 0;
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73 matchWidth = true;
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74 minorAlignment = ALIGN_TOPLEFT;
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75 horizontal = false;
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76 }
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77
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78 /**
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79 * Constructs a ToolbarLayout with a specified orientation. Default values are: child
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80 * spacing 0 pixels, matchWidth <code>false</code>, and {@link #ALIGN_TOPLEFT}
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81 * alignment.
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82 *
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83 * @param isHorizontal whether the children are oriented horizontally
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84 * @since 2.0
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85 */
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86 public this(bool isHorizontal) {
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87 instanceInit();
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88 horizontal = isHorizontal;
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89 transposer.setEnabled(horizontal);
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90 spacing = 0;
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91 matchWidth = false;
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92 minorAlignment = ALIGN_TOPLEFT;
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93 }
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94
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95 private Dimension calculateChildrenSize(List children, int wHint, int hHint,
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96 bool preferred) {
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97 Dimension childSize;
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98 IFigure child;
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99 int height = 0, width = 0;
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100 for (int i = 0; i < children.size(); i++) {
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101 child = cast(IFigure)children.get(i);
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102 childSize = transposer.t(preferred ? getChildPreferredSize(child, wHint, hHint)
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103 : getChildMinimumSize(child, wHint, hHint));
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104 height += childSize.height;
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105 width = Math.max(width, childSize.width);
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106 }
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107 return new Dimension(width, height);
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108 }
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109
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110 /**
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111 * Calculates the minimum size of the container based on the given hints. If this is a
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112 * vertically-oriented Toolbar Layout, then only the widthHint is respected (which means
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113 * that the children can be as tall as they desire). In this case, the minimum width
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114 * is that of the widest child, and the minimum height is the sum of the minimum
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115 * heights of all children, plus the spacing between them. The border and insets of the
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116 * container figure are also accounted for.
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117 *
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118 * @param container the figure whose minimum size has to be calculated
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119 * @param wHint the width hint (the desired width of the container)
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120 * @param hHint the height hint (the desired height of the container)
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121 * @return the minimum size of the container
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122 * @see #getMinimumSize(IFigure, int, int)
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123 * @since 2.1
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124 */
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125 protected Dimension calculateMinimumSize(IFigure container, int wHint, int hHint) {
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126 Insets insets = container.getInsets();
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127 if (isHorizontal()) {
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128 wHint = -1;
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129 if (hHint >= 0)
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130 hHint = Math.max(0, hHint - insets.getHeight());
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131 } else {
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132 hHint = -1;
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133 if (wHint >= 0)
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134 wHint = Math.max(0, wHint - insets.getWidth());
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135 }
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136
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137 List children = container.getChildren();
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138 Dimension minSize = calculateChildrenSize(children, wHint, hHint, false);
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139 // Do a second pass, if necessary
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140 if (wHint >= 0 && minSize.width > wHint) {
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141 minSize = calculateChildrenSize(children, minSize.width, hHint, false);
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142 } else if (hHint >= 0 && minSize.width > hHint) {
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143 minSize = calculateChildrenSize(children, wHint, minSize.width, false);
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144 }
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145
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146 minSize.height += Math.max(0, children.size() - 1) * spacing;
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147 return transposer.t(minSize)
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148 .expand(insets.getWidth(), insets.getHeight())
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149 .union_(getBorderPreferredSize(container));
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150 }
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151
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152 /**
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153 * Calculates the preferred size of the container based on the given hints. If this is a
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154 * vertically-oriented Toolbar Layout, then only the widthHint is respected (which means
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155 * that the children can be as tall as they desire). In this case, the preferred width
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156 * is that of the widest child, and the preferred height is the sum of the preferred
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157 * heights of all children, plus the spacing between them. The border and insets of the
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158 * container figure are also accounted for.
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159 *
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160 * @param container the figure whose preferred size has to be calculated
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161 * @param wHint the width hint (the desired width of the container)
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162 * @param hHint the height hint (the desired height of the container)
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163 * @return the preferred size of the container
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164 * @see #getPreferredSize(IFigure, int, int)
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165 * @since 2.0
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166 */
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167 protected Dimension calculatePreferredSize(IFigure container, int wHint, int hHint) {
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168 Insets insets = container.getInsets();
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169 if (isHorizontal()) {
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170 wHint = -1;
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171 if (hHint >= 0)
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172 hHint = Math.max(0, hHint - insets.getHeight());
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173 } else {
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174 hHint = -1;
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175 if (wHint >= 0)
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176 wHint = Math.max(0, wHint - insets.getWidth());
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177 }
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178
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179 List children = container.getChildren();
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180 Dimension prefSize = calculateChildrenSize(children, wHint, hHint, true);
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181 // Do a second pass, if necessary
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182 if (wHint >= 0 && prefSize.width > wHint) {
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183 prefSize = calculateChildrenSize(children, prefSize.width, hHint, true);
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184 } else if (hHint >= 0 && prefSize.width > hHint) {
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185 prefSize = calculateChildrenSize(children, wHint, prefSize.width, true);
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186 }
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187
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188 prefSize.height += Math.max(0, children.size() - 1) * spacing;
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189 return transposer.t(prefSize)
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190 .expand(insets.getWidth(), insets.getHeight())
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191 .union_(getBorderPreferredSize(container));
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192 }
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193
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194 /**
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195 * @param child the figure whose minimum size is to be determined
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196 * @param wHint the width hint
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197 * @param hHint the height hint
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198 * @return the given figure's minimum size
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199 * @since 3.3
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200 */
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201 protected Dimension getChildMinimumSize(IFigure child, int wHint, int hHint) {
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202 return child.getMinimumSize(wHint, hHint);
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203 }
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204
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205 /**
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206 * @param child the figure whose preferred size is to be determined
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207 * @param wHint the width hint
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208 * @param hHint the height hint
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209 * @return given figure's preferred size
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210 * @since 3.3
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211 */
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212 protected Dimension getChildPreferredSize(IFigure child, int wHint, int hHint) {
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213 return child.getPreferredSize(wHint, hHint);
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214 }
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215
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216 /**
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217 * Returns the minor aligment of the layout. Minor minor axis is the axis perpindicular
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218 * to the overall orientation set in the contructor.
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219 * @return the minor aligment
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220 */
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221 public int getMinorAlignment() {
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222 return minorAlignment;
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223 }
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224
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225 /**
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226 * @return the spacing between children
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227 */
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228 public int getSpacing() {
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229 return spacing;
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230 }
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231
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232 /**
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233 * Returns <code>true</code> if stretch minor axis has been enabled. The default value is
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234 * false.
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235 * @return <code>true</code> if stretch minor axis is enabled
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236 */
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237 public bool getStretchMinorAxis() {
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238 return matchWidth;
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239 }
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240
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241 /**
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242 * @return whether the orientation of the layout is horizontal
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243 * @since 2.0
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244 */
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245 public bool isHorizontal() {
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246 return horizontal;
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247 }
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248
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249 /**
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250 * @see org.eclipse.draw2d.AbstractHintLayout#isSensitiveHorizontally(IFigure)
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251 */
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252 protected bool isSensitiveHorizontally(IFigure parent) {
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253 return !isHorizontal();
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254 }
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255
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256 /**
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257 * @see org.eclipse.draw2d.AbstractHintLayout#isSensitiveVertically(IFigure)
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258 */
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259 protected bool isSensitiveVertically(IFigure parent) {
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260 return isHorizontal();
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261 }
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262
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263 /**
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264 * @see org.eclipse.draw2d.LayoutManager#layout(IFigure)
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265 */
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266 public void layout(IFigure parent) {
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267 List children = parent.getChildren();
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268 int numChildren = children.size();
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269 Rectangle clientArea = transposer.t(parent.getClientArea());
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270 int x = clientArea.x;
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271 int y = clientArea.y;
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272 int availableHeight = clientArea.height;
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273
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274 Dimension prefSizes [] = new Dimension[numChildren];
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275 Dimension minSizes [] = new Dimension[numChildren];
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276
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277 // Calculate the width and height hints. If it's a vertical ToolBarLayout,
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278 // then ignore the height hint (set it to -1); otherwise, ignore the
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279 // width hint. These hints will be passed to the children of the parent
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280 // figure when getting their preferred size.
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281 int wHint = -1;
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282 int hHint = -1;
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283 if (isHorizontal()) {
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284 hHint = parent.getClientArea(Rectangle.SINGLETON).height;
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285 } else {
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286 wHint = parent.getClientArea(Rectangle.SINGLETON).width;
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287 }
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288
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289 /*
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290 * Calculate sum of preferred heights of all children(totalHeight).
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
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parents:
diff changeset
291 * Calculate sum of minimum heights of all children(minHeight).
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parents:
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292 * Cache Preferred Sizes and Minimum Sizes of all children.
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293 *
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294 * totalHeight is the sum of the preferred heights of all children
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295 * totalMinHeight is the sum of the minimum heights of all children
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parents:
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296 * prefMinSumHeight is the sum of the difference between all children's
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297 * preferred heights and minimum heights. (This is used as a ratio to
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
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298 * calculate how much each child will shrink).
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299 */
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300 IFigure child;
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301 int totalHeight = 0;
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302 int totalMinHeight = 0;
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303 int prefMinSumHeight = 0;
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304
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305 for (int i = 0; i < numChildren; i++) {
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306 child = cast(IFigure)children.get(i);
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307
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308 prefSizes[i] = transposer.t(getChildPreferredSize(child, wHint, hHint));
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309 minSizes[i] = transposer.t(getChildMinimumSize(child, wHint, hHint));
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310
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311 totalHeight += prefSizes[i].height;
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312 totalMinHeight += minSizes[i].height;
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313 }
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314 totalHeight += (numChildren - 1) * spacing;
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315 totalMinHeight += (numChildren - 1) * spacing;
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316 prefMinSumHeight = totalHeight - totalMinHeight;
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317 /*
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318 * The total amount that the children must be shrunk is the
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319 * sum of the preferred Heights of the children minus
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320 * Max(the available area and the sum of the minimum heights of the children).
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321 *
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322 * amntShrinkHeight is the combined amount that the children must shrink
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323 * amntShrinkCurrentHeight is the amount each child will shrink respectively
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324 */
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325 int amntShrinkHeight = totalHeight - Math.max(availableHeight, totalMinHeight);
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326
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327 if (amntShrinkHeight < 0) {
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328 amntShrinkHeight = 0;
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329 }
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330
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331 for (int i = 0; i < numChildren; i++) {
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332 int amntShrinkCurrentHeight = 0;
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333 int prefHeight = prefSizes[i].height;
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334 int minHeight = minSizes[i].height;
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335 int prefWidth = prefSizes[i].width;
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336 int minWidth = minSizes[i].width;
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337 Rectangle newBounds = new Rectangle(x, y, prefWidth, prefHeight);
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338
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339 child = cast(IFigure)children.get(i);
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340 if (prefMinSumHeight !is 0)
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341 amntShrinkCurrentHeight =
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342 (prefHeight - minHeight) * amntShrinkHeight / (prefMinSumHeight);
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343
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344 int width = Math.min(prefWidth, transposer.t(child.getMaximumSize()).width);
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345 if (matchWidth)
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346 width = transposer.t(child.getMaximumSize()).width;
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347 width = Math.max(minWidth, Math.min(clientArea.width, width));
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348 newBounds.width = width;
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349
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350 int adjust = clientArea.width - width;
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351 switch (minorAlignment) {
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352 case ALIGN_TOPLEFT:
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353 adjust = 0;
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354 break;
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355 case ALIGN_CENTER:
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356 adjust /= 2;
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357 break;
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358 case ALIGN_BOTTOMRIGHT:
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359 break;
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360 default:
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361 }
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362 newBounds.x += adjust;
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363 newBounds.height -= amntShrinkCurrentHeight;
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364 child.setBounds(transposer.t(newBounds));
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365
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366 amntShrinkHeight -= amntShrinkCurrentHeight;
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367 prefMinSumHeight -= (prefHeight - minHeight);
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368 y += newBounds.height + spacing;
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369 }
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370 }
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371
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
372 /**
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
373 * Sets the alignment of the children contained in the layout. Possible values are
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
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parents:
diff changeset
374 * {@link #ALIGN_CENTER}, {@link #ALIGN_BOTTOMRIGHT} and {@link #ALIGN_TOPLEFT}.
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
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375 *
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
376 * @param align the minor alignment
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
377 * @since 2.0
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378 */
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Frank Benoit <benoit@tionex.de>
parents:
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379 public void setMinorAlignment(int align_) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
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380 minorAlignment = align_;
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381 }
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parents:
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382
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
383 /**
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
384 * Sets the amount of space between children.
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
385 *
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
386 * @param space the amount of space between children
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
387 * @since 2.0
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388 */
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parents:
diff changeset
389 public void setSpacing(int space) {
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390 spacing = space;
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391 }
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parents:
diff changeset
392
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
393 /**
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
394 * Sets children's width (if vertically oriented) or height (if horizontally oriented) to
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
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parents:
diff changeset
395 * stretch with their container.
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
396 *
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
397 * @deprecated use {@link #setStretchMinorAxis(bool)}
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
398 * @param match whether to stretch children
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
399 * @since 2.0
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
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parents:
diff changeset
400 */
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
401 public void setMatchWidth(bool match) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
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parents:
diff changeset
402 matchWidth = match;
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
403 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
404
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
405 /**
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
406 * Causes children that are smaller in the dimension of the minor axis to be stretched to
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
407 * fill the minor axis. The minor axis is the opposite of the orientation.
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
408 * @param stretch whether to stretch children
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
409 * @since 2.0
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
410 */
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
411 public void setStretchMinorAxis(bool stretch) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
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parents:
diff changeset
412 matchWidth = stretch;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
413 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
414
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
415 /**
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
416 * Sets the orientation of the children in the ToolbarLayout.
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
417 *
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
418 * @param flag whether the orientation should be vertical
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
419 * @since 2.0
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
420 */
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
421 public void setVertical(bool flag) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
422 if (horizontal !is flag) return;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
423 invalidate();
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
424 horizontal = !flag;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
425 transposer.setEnabled(horizontal);
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
426 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
427
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
428 }