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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) 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 }