Mercurial > projects > dwt2
annotate org.eclipse.draw2d/src/org/eclipse/draw2d/ToolbarLayout.d @ 16:dbfb303e8fb0
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author | Frank Benoit <benoit@tionex.de> |
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date | Wed, 18 Mar 2009 08:56:47 +0100 |
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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; |
16
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16 import java.util.List; |
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17 |
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18 import org.eclipse.draw2d.geometry.Dimension; |
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19 import org.eclipse.draw2d.geometry.Insets; |
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20 import org.eclipse.draw2d.geometry.Rectangle; |
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21 import org.eclipse.draw2d.geometry.Transposer; |
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22 import org.eclipse.draw2d.AbstractHintLayout; |
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23 import org.eclipse.draw2d.IFigure; |
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24 |
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25 /** |
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26 * Arranges figures in a single row or column. Orientation can be set to produce either |
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27 * a row or column layout. This layout tries to fit all children within the parent's |
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28 * client area. To do this, it compresses the children by some amount, but will not |
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29 * compress them smaller than their minimum size. If a child's preferred size is smaller |
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30 * than the row's or column's minor dimension, the layout can be configured to stretch the |
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31 * child. |
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32 */ |
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33 public class ToolbarLayout |
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34 : AbstractHintLayout |
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35 { |
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36 |
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37 /** Space in pixels between Figures **/ |
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38 protected int spacing; |
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39 /** Sets whether children should "stretch" with their container **/ |
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40 protected bool matchWidth; |
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41 /** Orientation of layout **/ |
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42 protected bool horizontal = false; |
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43 /** Alignment of layout **/ |
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44 protected int minorAlignment; |
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45 |
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46 /** Constant for center alignment **/ |
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47 public static const int ALIGN_CENTER = 0; |
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48 /** Constant for top-left alignment **/ |
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49 public static const int ALIGN_TOPLEFT = 1; |
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50 /** Constant for bottom-right alignment **/ |
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51 public static const int ALIGN_BOTTOMRIGHT = 2; |
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52 |
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53 /** Constant for horizontal alignment **/ |
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54 public static const bool HORIZONTAL = true; |
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55 /** Constant for vertical alignment **/ |
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56 public static const bool VERTICAL = false; |
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57 |
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58 /** Transposer object used in layout calculations **/ |
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59 protected Transposer transposer; |
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60 private void instanceInit() { |
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61 transposer = new Transposer(); |
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62 transposer.setEnabled(horizontal); |
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63 } |
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64 |
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65 /** |
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66 * Constructs a vertically oriented ToolbarLayout with child spacing of 0 pixels, |
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67 * matchWidth <code>true</code>, and {@link #ALIGN_TOPLEFT} alignment. |
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68 * |
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69 * @since 2.0 |
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70 */ |
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71 public this() { |
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72 instanceInit(); |
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73 spacing = 0; |
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74 matchWidth = true; |
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75 minorAlignment = ALIGN_TOPLEFT; |
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76 horizontal = false; |
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77 } |
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78 |
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79 /** |
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80 * Constructs a ToolbarLayout with a specified orientation. Default values are: child |
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81 * spacing 0 pixels, matchWidth <code>false</code>, and {@link #ALIGN_TOPLEFT} |
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82 * alignment. |
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83 * |
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84 * @param isHorizontal whether the children are oriented horizontally |
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85 * @since 2.0 |
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86 */ |
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87 public this(bool isHorizontal) { |
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88 instanceInit(); |
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89 horizontal = isHorizontal; |
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90 transposer.setEnabled(horizontal); |
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91 spacing = 0; |
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92 matchWidth = false; |
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93 minorAlignment = ALIGN_TOPLEFT; |
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94 } |
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95 |
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96 private Dimension calculateChildrenSize(List children, int wHint, int hHint, |
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97 bool preferred) { |
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98 Dimension childSize; |
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99 IFigure child; |
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100 int height = 0, width = 0; |
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101 for (int i = 0; i < children.size(); i++) { |
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102 child = cast(IFigure)children.get(i); |
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103 childSize = transposer.t(preferred ? getChildPreferredSize(child, wHint, hHint) |
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104 : getChildMinimumSize(child, wHint, hHint)); |
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105 height += childSize.height; |
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106 width = Math.max(width, childSize.width); |
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107 } |
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108 return new Dimension(width, height); |
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109 } |
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110 |
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111 /** |
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112 * Calculates the minimum size of the container based on the given hints. If this is a |
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113 * vertically-oriented Toolbar Layout, then only the widthHint is respected (which means |
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114 * that the children can be as tall as they desire). In this case, the minimum width |
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115 * is that of the widest child, and the minimum height is the sum of the minimum |
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116 * heights of all children, plus the spacing between them. The border and insets of the |
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117 * container figure are also accounted for. |
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118 * |
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119 * @param container the figure whose minimum size has to be calculated |
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120 * @param wHint the width hint (the desired width of the container) |
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121 * @param hHint the height hint (the desired height of the container) |
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122 * @return the minimum size of the container |
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123 * @see #getMinimumSize(IFigure, int, int) |
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124 * @since 2.1 |
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125 */ |
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126 protected Dimension calculateMinimumSize(IFigure container, int wHint, int hHint) { |
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127 Insets insets = container.getInsets(); |
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128 if (isHorizontal()) { |
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129 wHint = -1; |
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130 if (hHint >= 0) |
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131 hHint = Math.max(0, hHint - insets.getHeight()); |
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132 } else { |
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133 hHint = -1; |
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134 if (wHint >= 0) |
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135 wHint = Math.max(0, wHint - insets.getWidth()); |
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136 } |
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137 |
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138 List children = container.getChildren(); |
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139 Dimension minSize = calculateChildrenSize(children, wHint, hHint, false); |
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140 // Do a second pass, if necessary |
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141 if (wHint >= 0 && minSize.width > wHint) { |
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142 minSize = calculateChildrenSize(children, minSize.width, hHint, false); |
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143 } else if (hHint >= 0 && minSize.width > hHint) { |
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144 minSize = calculateChildrenSize(children, wHint, minSize.width, false); |
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145 } |
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146 |
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147 minSize.height += Math.max(0, children.size() - 1) * spacing; |
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148 return transposer.t(minSize) |
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149 .expand(insets.getWidth(), insets.getHeight()) |
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150 .union_(getBorderPreferredSize(container)); |
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151 } |
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152 |
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153 /** |
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154 * Calculates the preferred size of the container based on the given hints. If this is a |
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155 * vertically-oriented Toolbar Layout, then only the widthHint is respected (which means |
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156 * that the children can be as tall as they desire). In this case, the preferred width |
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157 * is that of the widest child, and the preferred height is the sum of the preferred |
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158 * heights of all children, plus the spacing between them. The border and insets of the |
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159 * container figure are also accounted for. |
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160 * |
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161 * @param container the figure whose preferred size has to be calculated |
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162 * @param wHint the width hint (the desired width of the container) |
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163 * @param hHint the height hint (the desired height of the container) |
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164 * @return the preferred size of the container |
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165 * @see #getPreferredSize(IFigure, int, int) |
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166 * @since 2.0 |
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167 */ |
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168 protected Dimension calculatePreferredSize(IFigure container, int wHint, int hHint) { |
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169 Insets insets = container.getInsets(); |
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170 if (isHorizontal()) { |
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171 wHint = -1; |
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172 if (hHint >= 0) |
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173 hHint = Math.max(0, hHint - insets.getHeight()); |
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174 } else { |
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175 hHint = -1; |
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176 if (wHint >= 0) |
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177 wHint = Math.max(0, wHint - insets.getWidth()); |
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178 } |
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179 |
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180 List children = container.getChildren(); |
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181 Dimension prefSize = calculateChildrenSize(children, wHint, hHint, true); |
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182 // Do a second pass, if necessary |
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183 if (wHint >= 0 && prefSize.width > wHint) { |
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184 prefSize = calculateChildrenSize(children, prefSize.width, hHint, true); |
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185 } else if (hHint >= 0 && prefSize.width > hHint) { |
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186 prefSize = calculateChildrenSize(children, wHint, prefSize.width, true); |
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187 } |
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188 |
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189 prefSize.height += Math.max(0, children.size() - 1) * spacing; |
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190 return transposer.t(prefSize) |
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191 .expand(insets.getWidth(), insets.getHeight()) |
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192 .union_(getBorderPreferredSize(container)); |
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193 } |
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194 |
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195 /** |
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196 * @param child the figure whose minimum size is to be determined |
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197 * @param wHint the width hint |
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198 * @param hHint the height hint |
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199 * @return the given figure's minimum size |
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200 * @since 3.3 |
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201 */ |
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202 protected Dimension getChildMinimumSize(IFigure child, int wHint, int hHint) { |
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203 return child.getMinimumSize(wHint, hHint); |
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204 } |
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205 |
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206 /** |
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207 * @param child the figure whose preferred size is to be determined |
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208 * @param wHint the width hint |
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209 * @param hHint the height hint |
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210 * @return given figure's preferred size |
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211 * @since 3.3 |
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212 */ |
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213 protected Dimension getChildPreferredSize(IFigure child, int wHint, int hHint) { |
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214 return child.getPreferredSize(wHint, hHint); |
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215 } |
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216 |
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217 /** |
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218 * Returns the minor aligment of the layout. Minor minor axis is the axis perpindicular |
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219 * to the overall orientation set in the contructor. |
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220 * @return the minor aligment |
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221 */ |
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222 public int getMinorAlignment() { |
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223 return minorAlignment; |
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224 } |
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225 |
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226 /** |
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227 * @return the spacing between children |
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228 */ |
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229 public int getSpacing() { |
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230 return spacing; |
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231 } |
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232 |
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233 /** |
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234 * Returns <code>true</code> if stretch minor axis has been enabled. The default value is |
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235 * false. |
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236 * @return <code>true</code> if stretch minor axis is enabled |
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237 */ |
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238 public bool getStretchMinorAxis() { |
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239 return matchWidth; |
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240 } |
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241 |
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242 /** |
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243 * @return whether the orientation of the layout is horizontal |
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244 * @since 2.0 |
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245 */ |
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246 public bool isHorizontal() { |
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247 return horizontal; |
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248 } |
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249 |
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250 /** |
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251 * @see org.eclipse.draw2d.AbstractHintLayout#isSensitiveHorizontally(IFigure) |
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252 */ |
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253 protected bool isSensitiveHorizontally(IFigure parent) { |
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254 return !isHorizontal(); |
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255 } |
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256 |
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257 /** |
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258 * @see org.eclipse.draw2d.AbstractHintLayout#isSensitiveVertically(IFigure) |
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259 */ |
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260 protected bool isSensitiveVertically(IFigure parent) { |
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261 return isHorizontal(); |
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262 } |
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263 |
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264 /** |
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265 * @see org.eclipse.draw2d.LayoutManager#layout(IFigure) |
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266 */ |
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267 public void layout(IFigure parent) { |
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268 List children = parent.getChildren(); |
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269 int numChildren = children.size(); |
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270 Rectangle clientArea = transposer.t(parent.getClientArea()); |
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271 int x = clientArea.x; |
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272 int y = clientArea.y; |
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273 int availableHeight = clientArea.height; |
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274 |
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275 Dimension prefSizes [] = new Dimension[numChildren]; |
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276 Dimension minSizes [] = new Dimension[numChildren]; |
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277 |
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278 // Calculate the width and height hints. If it's a vertical ToolBarLayout, |
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279 // then ignore the height hint (set it to -1); otherwise, ignore the |
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280 // width hint. These hints will be passed to the children of the parent |
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281 // figure when getting their preferred size. |
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282 int wHint = -1; |
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283 int hHint = -1; |
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284 if (isHorizontal()) { |
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285 hHint = parent.getClientArea(Rectangle.SINGLETON).height; |
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286 } else { |
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287 wHint = parent.getClientArea(Rectangle.SINGLETON).width; |
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288 } |
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289 |
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290 /* |
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291 * Calculate sum of preferred heights of all children(totalHeight). |
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292 * Calculate sum of minimum heights of all children(minHeight). |
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293 * Cache Preferred Sizes and Minimum Sizes of all children. |
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294 * |
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295 * totalHeight is the sum of the preferred heights of all children |
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296 * totalMinHeight is the sum of the minimum heights of all children |
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297 * prefMinSumHeight is the sum of the difference between all children's |
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298 * preferred heights and minimum heights. (This is used as a ratio to |
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299 * calculate how much each child will shrink). |
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300 */ |
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301 IFigure child; |
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302 int totalHeight = 0; |
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303 int totalMinHeight = 0; |
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304 int prefMinSumHeight = 0; |
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305 |
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306 for (int i = 0; i < numChildren; i++) { |
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307 child = cast(IFigure)children.get(i); |
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308 |
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309 prefSizes[i] = transposer.t(getChildPreferredSize(child, wHint, hHint)); |
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310 minSizes[i] = transposer.t(getChildMinimumSize(child, wHint, hHint)); |
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311 |
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312 totalHeight += prefSizes[i].height; |
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313 totalMinHeight += minSizes[i].height; |
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314 } |
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315 totalHeight += (numChildren - 1) * spacing; |
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316 totalMinHeight += (numChildren - 1) * spacing; |
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317 prefMinSumHeight = totalHeight - totalMinHeight; |
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318 /* |
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319 * The total amount that the children must be shrunk is the |
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320 * sum of the preferred Heights of the children minus |
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321 * Max(the available area and the sum of the minimum heights of the children). |
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322 * |
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323 * amntShrinkHeight is the combined amount that the children must shrink |
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324 * amntShrinkCurrentHeight is the amount each child will shrink respectively |
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325 */ |
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326 int amntShrinkHeight = totalHeight - Math.max(availableHeight, totalMinHeight); |
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327 |
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328 if (amntShrinkHeight < 0) { |
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329 amntShrinkHeight = 0; |
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330 } |
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331 |
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332 for (int i = 0; i < numChildren; i++) { |
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333 int amntShrinkCurrentHeight = 0; |
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334 int prefHeight = prefSizes[i].height; |
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335 int minHeight = minSizes[i].height; |
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336 int prefWidth = prefSizes[i].width; |
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337 int minWidth = minSizes[i].width; |
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338 Rectangle newBounds = new Rectangle(x, y, prefWidth, prefHeight); |
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339 |
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340 child = cast(IFigure)children.get(i); |
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341 if (prefMinSumHeight !is 0) |
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342 amntShrinkCurrentHeight = |
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343 (prefHeight - minHeight) * amntShrinkHeight / (prefMinSumHeight); |
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344 |
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345 int width = Math.min(prefWidth, transposer.t(child.getMaximumSize()).width); |
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346 if (matchWidth) |
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347 width = transposer.t(child.getMaximumSize()).width; |
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348 width = Math.max(minWidth, Math.min(clientArea.width, width)); |
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349 newBounds.width = width; |
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350 |
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351 int adjust = clientArea.width - width; |
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352 switch (minorAlignment) { |
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353 case ALIGN_TOPLEFT: |
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354 adjust = 0; |
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355 break; |
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356 case ALIGN_CENTER: |
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357 adjust /= 2; |
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358 break; |
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359 case ALIGN_BOTTOMRIGHT: |
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360 break; |
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361 default: |
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362 } |
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363 newBounds.x += adjust; |
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364 newBounds.height -= amntShrinkCurrentHeight; |
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365 child.setBounds(transposer.t(newBounds)); |
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366 |
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367 amntShrinkHeight -= amntShrinkCurrentHeight; |
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368 prefMinSumHeight -= (prefHeight - minHeight); |
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369 y += newBounds.height + spacing; |
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370 } |
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371 } |
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372 |
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373 /** |
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374 * Sets the alignment of the children contained in the layout. Possible values are |
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375 * {@link #ALIGN_CENTER}, {@link #ALIGN_BOTTOMRIGHT} and {@link #ALIGN_TOPLEFT}. |
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376 * |
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377 * @param align the minor alignment |
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378 * @since 2.0 |
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379 */ |
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380 public void setMinorAlignment(int align_) { |
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381 minorAlignment = align_; |
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382 } |
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383 |
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384 /** |
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385 * Sets the amount of space between children. |
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386 * |
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387 * @param space the amount of space between children |
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388 * @since 2.0 |
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389 */ |
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390 public void setSpacing(int space) { |
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391 spacing = space; |
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392 } |
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393 |
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394 /** |
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395 * Sets children's width (if vertically oriented) or height (if horizontally oriented) to |
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396 * stretch with their container. |
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397 * |
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398 * @deprecated use {@link #setStretchMinorAxis(bool)} |
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399 * @param match whether to stretch children |
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400 * @since 2.0 |
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401 */ |
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402 public void setMatchWidth(bool match) { |
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403 matchWidth = match; |
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404 } |
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405 |
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406 /** |
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407 * Causes children that are smaller in the dimension of the minor axis to be stretched to |
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408 * fill the minor axis. The minor axis is the opposite of the orientation. |
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409 * @param stretch whether to stretch children |
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410 * @since 2.0 |
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411 */ |
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412 public void setStretchMinorAxis(bool stretch) { |
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413 matchWidth = stretch; |
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414 } |
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415 |
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416 /** |
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417 * Sets the orientation of the children in the ToolbarLayout. |
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418 * |
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419 * @param flag whether the orientation should be vertical |
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420 * @since 2.0 |
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421 */ |
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422 public void setVertical(bool flag) { |
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423 if (horizontal !is flag) return; |
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424 invalidate(); |
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425 horizontal = !flag; |
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426 transposer.setEnabled(horizontal); |
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427 } |
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428 |
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429 } |