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annotate org.eclipse.draw2d/src/org/eclipse/draw2d/text/ParagraphTextLayout.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.text.ParagraphTextLayout;
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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.swt.graphics.Font;
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18 import org.eclipse.draw2d.text.TextLayout;
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19 import org.eclipse.draw2d.text.TextFlow;
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20 import org.eclipse.draw2d.text.FlowUtilities;
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21 import org.eclipse.draw2d.text.FlowContext;
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22 import org.eclipse.draw2d.text.TextFragmentBox;
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23 import org.eclipse.draw2d.text.FlowBorder;
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24
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25 /**
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26 * The layout for {@link TextFlow}.
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27 * @author hudsonr
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28 * @since 2.1
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29 */
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30 public class ParagraphTextLayout
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31 : TextLayout
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32 {
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33
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34 /**
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35 * Wrapping will ONLY occur at valid line breaks
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36 */
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37 public static const int WORD_WRAP_HARD = 0;
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38
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39 /**
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40 * Wrapping will always occur at the end of the available space, breaking in the middle of
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41 * a word.
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42 */
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43 public static const int WORD_WRAP_SOFT = 1;
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44
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45 /**
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46 * Wrapping will always occur at the end of available space, truncating a word if it
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47 * doesn't fit. Note that truncation is not supported across multiple figures and
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48 * with BiDi. Undesired effects may result if that is the case.
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49 */
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50 public static const int WORD_WRAP_TRUNCATE = 2;
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51
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52 private int wrappingStyle = WORD_WRAP_HARD;
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53
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54 /**
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55 * Constructs a new ParagraphTextLayout on the specified TextFlow.
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56 * @param flow the TextFlow
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57 */
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58 public this(TextFlow flow) {
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59 super(flow);
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60 }
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61
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62 /**
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63 * Constructs the layout with the specified TextFlow and wrapping style. The wrapping
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64 * style must be one of:
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65 * <UL>
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66 * <LI>{@link #WORD_WRAP_HARD}</LI>
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67 * <LI>{@link #WORD_WRAP_SOFT}</LI>
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68 * <LI>{@link #WORD_WRAP_TRUNCATE}</LI>
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69 * </UL>
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70 * @param flow the textflow
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71 * @param style the style of wrapping
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72 */
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73 public this(TextFlow flow, int style) {
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74 this(flow);
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75 wrappingStyle = style;
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76 }
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77
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78 /**
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79 * Given the Bidi levels of the given text, this method breaks the given text up by
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80 * its level runs.
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81 * @param text the String that needs to be broken up into its level runs
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82 * @param levelInfo the Bidi levels
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83 * @return the requested segment
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84 */
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85 private String[] getSegments(String text, int levelInfo[]) {
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86 if (levelInfo.length is 1)
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87 return [text];
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88
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89 String result[] = new String[levelInfo.length / 2 + 1];
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90
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91 int i;
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92 int endOffset;
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93 int beginOffset = 0;
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94
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95 for (i = 0; i < result.length - 1; i++) {
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96 endOffset = levelInfo[i * 2 + 1];
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97 result[i] = text.substring(beginOffset, endOffset);
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98 beginOffset = endOffset;
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99 }
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100 endOffset = text.length;
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101 result[i] = text.substring(beginOffset, endOffset);
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102 return result;
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103 }
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104
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105 class SegmentLookahead : /+FlowUtilities.+/LookAhead {
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106 private int seg = -1;
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107 private String segs[];
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108 private int[] width;
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109 private final int trailingBorderSize;
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110 this(String segs[], int trailingBorderSize) {
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111 this.segs = segs;
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112 this.trailingBorderSize = trailingBorderSize;
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113 }
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114 public int getWidth() {
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115 if (width is null) {
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116 width = new int[1];
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117 int startingIndex = seg + 1;
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118 TextFlow textFlow = cast(TextFlow)getFlowFigure();
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119
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120 if (startingIndex is segs.length) {
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121 width[0] += trailingBorderSize;
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122 getContext().getWidthLookahead(textFlow, width);
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123 } else {
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124 String rest = segs[startingIndex];
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125 for (int k = startingIndex + 1; k < segs.length; k++)
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126 rest ~= segs[k];
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127 if (!textFlow.addLeadingWordWidth(rest, width)) {
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128 width[0] += trailingBorderSize;
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129 getContext().getWidthLookahead(textFlow, width);
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130 }
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131 }
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132 }
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133 return width[0];
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134 }
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135 public void setIndex(int value) {
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136 this.seg = value;
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137 width = null;
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138 }
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139 }
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140
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141 /**
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142 * @see org.eclipse.draw2d.text.FlowFigureLayout#layout()
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143 */
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144 protected void layout() {
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145 TextFlow textFlow = cast(TextFlow)getFlowFigure();
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146 int offset = 0;
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147
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148 FlowContext context = getContext();
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149 List fragments = textFlow.getFragments();
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150 Font font = textFlow.getFont();
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151 int fragIndex = 0;
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152 int advance = 0;
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153
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154 TextFragmentBox fragment;
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155 int levelInfo[] = (textFlow.getBidiInfo() is null)
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156 ? [-1]
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157 : textFlow.getBidiInfo().levelInfo;
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158
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159 String segment;
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160 String[] segments = getSegments(textFlow.getText(), levelInfo);
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161 FlowBorder border = null;
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162 if ( null !is cast(FlowBorder)textFlow.getBorder() )
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163 border = cast(FlowBorder)textFlow.getBorder();
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164
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165 SegmentLookahead lookahead = new SegmentLookahead(segments, border is null ? 0 : border.getRightMargin());
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166 int seg;
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167
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168 if (border !is null) {
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169 fragment = getFragment(fragIndex++, fragments);
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170 fragment.setBidiLevel(levelInfo[0]);
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171 fragment.setTruncated(false);
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172 fragment.offset = fragment.length = -1;
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173 fragment.setWidth(border.getLeftMargin() + border.getInsets(textFlow).left);
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174 if (context.getRemainingLineWidth()
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175 < fragment.getWidth() + lookahead.getWidth())
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176 context.endLine();
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177 context.addToCurrentLine(fragment);
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178 }
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179
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180 FlowUtilities flowUtilities = textFlow.getFlowUtilities_package();
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181 for (seg = 0; seg < segments.length; seg++) {
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182 segment = segments[seg];
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183 lookahead.setIndex(seg);
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184
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185 do {
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186 fragment = getFragment(fragIndex++, fragments);
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187
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188 fragment.offset = offset;
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189 fragment.setBidiLevel(levelInfo[seg * 2]);
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190
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191 advance = flowUtilities.wrapFragmentInContext_package(fragment, segment,
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192 context, lookahead, font, wrappingStyle);
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193 segment = segment.substring(advance);
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194 offset += advance;
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195 if ((segment.length > 0
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196 || fragment.length < advance)
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197 || fragment.isTruncated())
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198 context.endLine();
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199 } while (segment.length > 0
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200 || (!fragment.isTruncated() && fragment.length < advance));
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201 }
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202
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203 if (border !is null) {
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204 fragment = getFragment(fragIndex++, fragments);
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205 fragment.setBidiLevel(levelInfo[0]);
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206 fragment.setTruncated(false);
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207 fragment.offset = fragment.length = -1;
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208 fragment.setWidth(border.getRightMargin() + border.getInsets(textFlow).right);
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209 context.addToCurrentLine(fragment);
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210 }
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211
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212 //Remove the remaining unused fragments.
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213 while (fragIndex < fragments.size())
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214 fragments.remove(fragments.size() - 1);
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215 }
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216
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217 }