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annotate dwtx/draw2d/text/ParagraphTextLayout.d @ 98:95307ad235d9

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Added Draw2d code, still work in progress
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 00:52:14 +0200
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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 dwtx.draw2d.text.ParagraphTextLayout;
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14
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15 import dwt.dwthelper.utils;
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16 import dwtx.dwtxhelper.Collection;
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17
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18 import dwt.graphics.Font;
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19 import dwtx.draw2d.text.TextLayout;
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20 import dwtx.draw2d.text.TextFlow;
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21 import dwtx.draw2d.text.FlowUtilities;
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22 import dwtx.draw2d.text.FlowContext;
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23 import dwtx.draw2d.text.TextFragmentBox;
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24 import dwtx.draw2d.text.FlowBorder;
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25
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26 /**
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27 * The layout for {@link TextFlow}.
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28 * @author hudsonr
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29 * @since 2.1
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30 */
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31 public class ParagraphTextLayout
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32 : TextLayout
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33 {
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34
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35 /**
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36 * Wrapping will ONLY occur at valid line breaks
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37 */
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38 public static const int WORD_WRAP_HARD = 0;
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39
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40 /**
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41 * Wrapping will always occur at the end of the available space, breaking in the middle of
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42 * a word.
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43 */
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44 public static const int WORD_WRAP_SOFT = 1;
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45
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46 /**
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47 * Wrapping will always occur at the end of available space, truncating a word if it
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48 * doesn't fit. Note that truncation is not supported across multiple figures and
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49 * with BiDi. Undesired effects may result if that is the case.
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50 */
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51 public static const int WORD_WRAP_TRUNCATE = 2;
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52
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53 private int wrappingStyle = WORD_WRAP_HARD;
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54
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55 /**
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56 * Constructs a new ParagraphTextLayout on the specified TextFlow.
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57 * @param flow the TextFlow
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58 */
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59 public this(TextFlow flow) {
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60 super(flow);
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61 }
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62
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63 /**
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64 * Constructs the layout with the specified TextFlow and wrapping style. The wrapping
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65 * style must be one of:
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66 * <UL>
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67 * <LI>{@link #WORD_WRAP_HARD}</LI>
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68 * <LI>{@link #WORD_WRAP_SOFT}</LI>
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69 * <LI>{@link #WORD_WRAP_TRUNCATE}</LI>
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70 * </UL>
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71 * @param flow the textflow
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72 * @param style the style of wrapping
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73 */
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74 public this(TextFlow flow, int style) {
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75 this(flow);
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76 wrappingStyle = style;
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77 }
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78
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79 /**
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80 * Given the Bidi levels of the given text, this method breaks the given text up by
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81 * its level runs.
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82 * @param text the String that needs to be broken up into its level runs
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83 * @param levelInfo the Bidi levels
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84 * @return the requested segment
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85 */
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86 private String[] getSegments(String text, int levelInfo[]) {
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87 if (levelInfo.length is 1)
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88 return [text];
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89
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90 String result[] = new String[levelInfo.length / 2 + 1];
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91
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92 int i;
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93 int endOffset;
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94 int beginOffset = 0;
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95
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96 for (i = 0; i < result.length - 1; i++) {
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97 endOffset = levelInfo[i * 2 + 1];
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98 result[i] = text.substring(beginOffset, endOffset);
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99 beginOffset = endOffset;
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100 }
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101 endOffset = text.length;
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102 result[i] = text.substring(beginOffset, endOffset);
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103 return result;
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104 }
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105
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106 class SegmentLookahead : /+FlowUtilities.+/LookAhead {
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107 private int seg = -1;
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108 private String segs[];
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109 private int[] width;
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110 private final int trailingBorderSize;
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111 this(String segs[], int trailingBorderSize) {
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112 this.segs = segs;
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113 this.trailingBorderSize = trailingBorderSize;
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114 }
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115 public int getWidth() {
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116 if (width is null) {
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117 width = new int[1];
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118 int startingIndex = seg + 1;
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119 TextFlow textFlow = cast(TextFlow)getFlowFigure();
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120
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121 if (startingIndex is segs.length) {
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122 width[0] += trailingBorderSize;
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123 getContext().getWidthLookahead(textFlow, width);
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124 } else {
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125 String rest = segs[startingIndex];
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126 for (int k = startingIndex + 1; k < segs.length; k++)
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127 rest ~= segs[k];
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128 if (!textFlow.addLeadingWordWidth(rest, width)) {
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129 width[0] += trailingBorderSize;
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130 getContext().getWidthLookahead(textFlow, width);
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131 }
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132 }
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133 }
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134 return width[0];
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135 }
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136 public void setIndex(int value) {
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137 this.seg = value;
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138 width = null;
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139 }
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140 }
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141
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142 /**
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143 * @see dwtx.draw2d.text.FlowFigureLayout#layout()
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144 */
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145 protected void layout() {
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146 TextFlow textFlow = cast(TextFlow)getFlowFigure();
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147 int offset = 0;
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148
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149 FlowContext context = getContext();
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150 List fragments = textFlow.getFragments();
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151 Font font = textFlow.getFont();
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152 int fragIndex = 0;
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153 int advance = 0;
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154
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155 TextFragmentBox fragment;
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156 int levelInfo[] = (textFlow.getBidiInfo() is null)
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157 ? [-1]
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158 : textFlow.getBidiInfo().levelInfo;
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159
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160 String segment;
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161 String[] segments = getSegments(textFlow.getText(), levelInfo);
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162 FlowBorder border = null;
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163 if ( null !is cast(FlowBorder)textFlow.getBorder() )
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164 border = cast(FlowBorder)textFlow.getBorder();
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165
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166 SegmentLookahead lookahead = new SegmentLookahead(segments, border is null ? 0 : border.getRightMargin());
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167 int seg;
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168
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169 if (border !is null) {
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170 fragment = getFragment(fragIndex++, fragments);
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171 fragment.setBidiLevel(levelInfo[0]);
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172 fragment.setTruncated(false);
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173 fragment.offset = fragment.length = -1;
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174 fragment.setWidth(border.getLeftMargin() + border.getInsets(textFlow).left);
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175 if (context.getRemainingLineWidth()
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176 < fragment.getWidth() + lookahead.getWidth())
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177 context.endLine();
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178 context.addToCurrentLine(fragment);
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179 }
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180
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181 FlowUtilities flowUtilities = textFlow.getFlowUtilities_package();
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182 for (seg = 0; seg < segments.length; seg++) {
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183 segment = segments[seg];
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184 lookahead.setIndex(seg);
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185
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186 do {
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187 fragment = getFragment(fragIndex++, fragments);
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188
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189 fragment.offset = offset;
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190 fragment.setBidiLevel(levelInfo[seg * 2]);
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191
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192 advance = flowUtilities.wrapFragmentInContext_package(fragment, segment,
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193 context, lookahead, font, wrappingStyle);
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194 segment = segment.substring(advance);
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195 offset += advance;
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196 if ((segment.length > 0
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197 || fragment.length < advance)
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198 || fragment.isTruncated())
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199 context.endLine();
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200 } while (segment.length > 0
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201 || (!fragment.isTruncated() && fragment.length < advance));
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202 }
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203
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204 if (border !is null) {
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205 fragment = getFragment(fragIndex++, fragments);
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206 fragment.setBidiLevel(levelInfo[0]);
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207 fragment.setTruncated(false);
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208 fragment.offset = fragment.length = -1;
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209 fragment.setWidth(border.getRightMargin() + border.getInsets(textFlow).right);
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210 context.addToCurrentLine(fragment);
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211 }
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212
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213 //Remove the remaining unused fragments.
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214 while (fragIndex < fragments.size())
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215 fragments.remove(fragments.size() - 1);
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216 }
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217
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218 }