Mercurial > projects > dwt2
annotate org.eclipse.draw2d/src/org/eclipse/draw2d/text/LineRoot.d @ 12:bc29606a740c
Added dwt-addons in original directory structure of eclipse.org
author | Frank Benoit <benoit@tionex.de> |
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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) 2004, 2005 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 |
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14 module org.eclipse.draw2d.text.LineRoot; |
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15 |
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16 import java.lang.all; |
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17 |
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18 import org.eclipse.draw2d.geometry.Rectangle; |
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19 import org.eclipse.draw2d.text.LineBox; |
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20 import org.eclipse.draw2d.text.FlowBox; |
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21 import org.eclipse.draw2d.text.NestedLine; |
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22 import org.eclipse.draw2d.text.ContentBox; |
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23 import org.eclipse.draw2d.text.InlineFlow; |
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24 |
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25 /** |
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26 * LineRoot is the top-most container on a line of text displayed in Draw2d. Hence, a |
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27 * LineRoot can tell you of things like the highest ascent or descent on a line, which |
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28 * is required to display selection and such. All |
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29 * {@link org.eclipse.draw2d.text.ContentBox fragments} know of the LineRoot they belong |
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30 * to. |
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31 * @author Randy Hudson |
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32 * @author Pratik Shah |
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33 * @since 3.1 |
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34 */ |
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35 public class LineRoot |
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36 : LineBox |
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37 { |
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38 |
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39 private int baseline; |
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40 private bool isMirrored; |
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41 |
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42 /** |
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43 * Constructor |
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44 * @param isMirrored <code>true</code> if the line is to be displayed in a mirrored control |
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45 */ |
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46 public this(bool isMirrored) { |
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47 this.isMirrored = isMirrored; |
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48 } |
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49 |
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50 /** |
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51 * @see org.eclipse.draw2d.text.CompositeBox#add(org.eclipse.draw2d.text.FlowBox) |
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52 */ |
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53 public void add(FlowBox child) { |
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54 super.add(child); |
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55 child.setLineRoot(this); |
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56 } |
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57 |
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58 private void bidiCommit() { |
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59 int xLocation = getX(); |
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60 BidiLevelNode root = new BidiLevelNode(); |
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61 List branches = new ArrayList(); |
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62 // branches does not include this LineRoot; all the non-leaf child fragments of a |
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63 // parent will be listed before the parent itself in this list |
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64 buildBidiTree(this, root, branches); |
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65 List result = new ArrayList(); |
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66 root.emit(result); |
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67 int i = isMirrored ? result.size() - 1 : 0; |
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68 while (i >= 0 && i < result.size()) { |
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69 FlowBox box = cast(FlowBox)result.get(i); |
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70 box.setX(xLocation); |
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71 xLocation += box.getWidth(); |
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72 i += isMirrored ? -1 : 1; |
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73 } |
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74 // set the bounds of the composite boxes, and break overlapping ones into two |
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75 layoutNestedLines(branches); |
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76 } |
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77 |
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78 private void buildBidiTree(FlowBox box, BidiLevelNode node, List branches) { |
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79 if ( auto lb = cast(LineBox)box ) { |
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80 List children = lb.getFragments(); |
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81 for (int i = 0; i < children.size(); i++) |
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82 buildBidiTree(cast(FlowBox)children.get(i), node, branches); |
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83 if (box !is this) |
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84 branches.add(box); |
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85 } else { |
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86 ContentBox leafBox = cast(ContentBox)box; |
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87 while (leafBox.getBidiLevel() < node.level) |
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88 node = node.pop(); |
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89 while (leafBox.getBidiLevel() > node.level) |
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90 node = node.push(); |
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91 node.add(leafBox); |
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92 } |
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93 } |
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94 |
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95 /** |
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96 * Committing a LineRoot will position its children correctly. All children boxes are made |
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97 * to have the same baseline, and are laid out according to the Unicode BiDi Algorithm, |
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98 * or left-to-right if Bidi is not necessary. |
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99 */ |
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100 public void commit() { |
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101 if (requiresBidi()) |
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102 bidiCommit(); |
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103 else |
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104 contiguousCommit(this, getX()); |
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105 } |
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106 |
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107 /** |
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108 * A LineRoot cannot be targetted. |
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109 * @see org.eclipse.draw2d.text.FlowBox#containsPoint(int, int) |
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110 */ |
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111 public bool containsPoint(int x, int y) { |
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112 return false; |
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113 } |
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114 |
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115 /* |
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116 * Simply lays out all fragments from left-to-right in the order in which they're |
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117 * contained. |
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118 */ |
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119 private void contiguousCommit(FlowBox box, int x) { |
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120 box.setX(x); |
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121 if (auto lb = cast(LineBox)box ) { |
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122 List fragments = lb.getFragments(); |
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123 int i = isMirrored ? fragments.size() - 1 : 0; |
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124 while (i >= 0 && i < fragments.size()) { |
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125 FlowBox child = cast(FlowBox)fragments.get(i); |
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126 contiguousCommit(child, x); |
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127 x += child.getWidth(); |
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128 i += isMirrored ? -1 : 1; |
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129 } |
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130 } |
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131 } |
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132 |
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133 private Result findParent(NestedLine line, List branches, int afterIndex) { |
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134 for (int i = afterIndex + 1; i < branches.size(); i++) { |
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135 NestedLine box = cast(NestedLine)branches.get(i); |
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136 int index = box.getFragments().indexOf(line); |
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137 if (index >= 0) |
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138 return new Result(box, index); |
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139 } |
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140 return new Result(this, getFragments().indexOf(line)); |
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141 } |
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142 |
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143 /** |
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144 * @see org.eclipse.draw2d.text.FlowBox#getBaseline() |
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145 */ |
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146 public int getBaseline() { |
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147 return baseline; |
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148 } |
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149 |
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150 LineRoot getLineRoot() { |
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151 return this; |
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152 } |
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153 |
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154 int getVisibleBottom() { |
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155 return baseline + contentDescent; |
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156 } |
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157 |
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158 int getVisibleTop() { |
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159 return baseline - contentAscent; |
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160 } |
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161 |
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162 private void layoutNestedLines(List branches) { |
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163 for (int i = 0; i < branches.size(); i++) { |
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164 NestedLine parent = cast(NestedLine)branches.get(i); |
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165 FlowBox prevChild = null; |
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166 Rectangle bounds = null; |
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167 List frags = parent.getFragments(); |
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168 for (int j = 0; j < frags.size(); j++) { |
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169 FlowBox child = cast(FlowBox) frags.get(j); |
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170 if (prevChild !is null && prevChild.getX() + prevChild.width !is child.getX() |
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171 && child.getX() + child.width !is prevChild.getX()) { |
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172 // the boxes are not adjacent, and hence the parent box needs to |
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173 // be broken up |
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174 InlineFlow parentFig = parent.owner; |
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175 // Create and initialize a new line box |
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176 NestedLine newBox = new NestedLine(parentFig); |
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177 newBox.setLineRoot(this); |
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178 // Add all remaining fragments from the current line box to the new one |
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179 for (int k = j; k < frags.size();) |
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180 newBox.fragments.add(frags.remove(k)); |
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181 // Add the new line box to the parent box's list of fragments |
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182 Result result = findParent(parent, branches, i); |
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183 result.parent.getFragments().add(result.index + 1, newBox); |
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184 // Add the new line box to the flow figure's list of fragments |
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185 parentFig.fragments.add(parentFig.fragments.indexOf(parent) + 1, newBox); |
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186 branches.add(i + 1, newBox); |
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187 break; |
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188 } |
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189 if (bounds is null) |
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190 bounds = new Rectangle(child.getX(), 1, child.getWidth(), 1); |
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191 else |
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192 bounds.union_(child.getX(), 1, child.getWidth(), 1); |
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193 prevChild = child; |
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194 } |
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195 parent.setX(bounds.x); |
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196 parent.setWidth(bounds.width); |
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197 } |
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198 } |
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199 |
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200 /** |
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201 * Positions the line vertically by settings its baseline. |
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202 * @param baseline the baseline |
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203 */ |
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204 public void setBaseline(int baseline) { |
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205 this.baseline = baseline; |
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206 } |
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207 |
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208 /** |
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209 * @see org.eclipse.draw2d.text.CompositeBox#setLineTop(int) |
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210 */ |
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211 public void setLineTop(int top) { |
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212 this.baseline = top + getAscent(); |
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213 } |
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214 |
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215 private static class BidiLevelNode : ArrayList |
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216 { |
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217 int level; |
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218 final BidiLevelNode parent; |
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219 |
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220 this() { |
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221 this(null, 0); |
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222 } |
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223 |
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224 this(BidiLevelNode parent, int level) { |
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225 this.parent = parent; |
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226 this.level = level; |
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227 } |
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228 |
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229 void emit(List list) { |
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230 if (level % 2 is 1) { |
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231 for (int i = size() - 1; i >= 0; i--) { |
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232 Object child = get(i); |
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233 if (auto bln = cast(BidiLevelNode)child ) |
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234 bln.emit(list); |
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235 else |
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236 list.add(child); |
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237 } |
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238 } else { |
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239 for (int i = 0; i < size(); i++) { |
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240 Object child = get(i); |
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241 if (auto bln = cast(BidiLevelNode)child ) |
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242 bln.emit(list); |
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243 else |
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244 list.add(child); |
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245 } |
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246 } |
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247 } |
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248 |
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249 BidiLevelNode pop() { |
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250 return parent; |
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251 } |
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252 |
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253 BidiLevelNode push() { |
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254 if (!isEmpty()) { |
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255 Object last = get(size() - 1); |
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256 if (null !is cast(BidiLevelNode)last && (cast(BidiLevelNode)last).level is level + 1) |
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257 return cast(BidiLevelNode)last; |
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258 } |
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259 BidiLevelNode child = new BidiLevelNode(this, level + 1); |
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260 add(child); |
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261 return child; |
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262 } |
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263 } |
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264 |
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265 private static class Result { |
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266 private int index; |
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267 private LineBox parent; |
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268 private this(LineBox box, int i) { |
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269 parent = box; |
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270 index = i; |
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271 } |
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272 } |
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273 |
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274 } |