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annotate org.eclipse.draw2d/src/org/eclipse/draw2d/text/FlowUtilities.d @ 16:dbfb303e8fb0

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first complete successful compile (win-only)
author Frank Benoit <benoit@tionex.de>
date Wed, 18 Mar 2009 08:56:47 +0100
parents bc29606a740c
children
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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.FlowUtilities;
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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 java.mangoicu.UBreakIterator;
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18 import java.mangoicu.ULocale;
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19
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20 import org.eclipse.swt.SWT;
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21 import org.eclipse.swt.graphics.Font;
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22 import org.eclipse.swt.graphics.Rectangle;
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23 import org.eclipse.swt.graphics.TextLayout;
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24 import org.eclipse.swt.widgets.Display;
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25 import org.eclipse.draw2d.FigureUtilities;
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26 import org.eclipse.draw2d.TextUtilities;
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27 import org.eclipse.draw2d.text.TextFragmentBox;
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28 import org.eclipse.draw2d.text.InlineFlow;
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29 import org.eclipse.draw2d.text.FlowContext;
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30 import org.eclipse.draw2d.text.FlowBorder;
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31 import org.eclipse.draw2d.text.ParagraphTextLayout;
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32 import org.eclipse.draw2d.text.TextFlow;
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33
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34 interface LookAhead {
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35 int getWidth();
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36 }
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37
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38 /**
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39 * Utility class for FlowFigures.
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40 * @author hudsonr
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41 * @since 3.4
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42 */
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43 public class FlowUtilities
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44 {
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45
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46 /**
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47 * a singleton default instance
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48 */
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49 private static FlowUtilities INSTANCE_;
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50 public static FlowUtilities INSTANCE(){
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51 if( INSTANCE_ is null ){
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52 synchronized( FlowUtilities.classinfo ){
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53 if( INSTANCE_ is null ){
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54 INSTANCE_ = new FlowUtilities();
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55 }
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56 }
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57 }
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58 return INSTANCE_;
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59 }
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60
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61
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62
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63 private static bool INTERNAL_LINE_BREAK_initialized = false;
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64 private static UBreakIterator INTERNAL_LINE_BREAK_;
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65 private static UBreakIterator INTERNAL_LINE_BREAK(){
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66 if( !INTERNAL_LINE_BREAK_initialized ){
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67 synchronized( FlowUtilities.classinfo ){
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68 if( !INTERNAL_LINE_BREAK_initialized ){
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69 INTERNAL_LINE_BREAK_ = UBreakIterator.openLineIterator( ULocale.Default );
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70 }
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71 INTERNAL_LINE_BREAK_initialized = true;
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72 }
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73 }
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74 return INTERNAL_LINE_BREAK_;
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75 }
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76
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77 private static TextLayout layout;
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78
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79 private static bool LINE_BREAK_initialized = false;
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80 private static UBreakIterator LINE_BREAK_;
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81 static UBreakIterator LINE_BREAK(){
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82 if( !LINE_BREAK_initialized ){
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83 synchronized( FlowUtilities.classinfo ){
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84 if( !LINE_BREAK_initialized ){
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85 LINE_BREAK_ = UBreakIterator.openLineIterator( ULocale.Default );
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86 }
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87 LINE_BREAK_initialized = true;
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88 }
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89 }
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90 return LINE_BREAK_;
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91 }
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92
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93 static bool canBreakAfter(dchar c) {
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94 bool result = CharacterIsWhitespace(c) || c is '-';
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95 if (!result && (c < 'a' || c > 'z')) {
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96 // chinese characters and such would be caught in here
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97 // LINE_BREAK is used here because INTERNAL_LINE_BREAK might be in use
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98 LINE_BREAK.setText(dcharToString(c) ~ "a"); //$NON-NLS-1$
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99 result = LINE_BREAK.isBoundary(1);
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100 }
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101 return result;
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102 }
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103
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104 private static int findFirstDelimeter(String string) {
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105 int macNL = string.indexOf('\r');
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106 int unixNL = string.indexOf('\n');
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107
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108 if (macNL is -1)
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109 macNL = Integer.MAX_VALUE;
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110 if (unixNL is -1)
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111 unixNL = Integer.MAX_VALUE;
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112
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113 return Math.min(macNL, unixNL);
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114 }
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115
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116 /**
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117 * Gets the average character width.
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118 *
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119 * @param fragment the supplied TextFragmentBox to use for calculation.
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120 * if the length is 0 or if the width is or below 0,
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121 * the average character width is taken from standard
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122 * font metrics.
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123 * @param font the font to use in case the TextFragmentBox conditions
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124 * above are true.
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125 * @return the average character width
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126 */
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127 protected float getAverageCharWidth(TextFragmentBox fragment, Font font) {
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128 if (fragment.getWidth() > 0 && fragment.length !is 0)
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129 return fragment.getWidth() / cast(float)fragment.length;
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130 return FigureUtilities.getFontMetrics(font).getAverageCharWidth();
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131 }
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132
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133 static int getBorderAscent(InlineFlow owner) {
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134 if (null !is cast(FlowBorder)owner.getBorder() ) {
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135 FlowBorder border = cast(FlowBorder)owner.getBorder();
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136 return border.getInsets(owner).top;
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137 }
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138 return 0;
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139 }
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140
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141 static int getBorderAscentWithMargin(InlineFlow owner) {
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142 if (null !is cast(FlowBorder)owner.getBorder() ) {
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143 FlowBorder border = cast(FlowBorder)owner.getBorder();
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144 return border.getTopMargin() + border.getInsets(owner).top;
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145 }
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146 return 0;
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147 }
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148
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149 static int getBorderDescent(InlineFlow owner) {
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150 if (null !is cast(FlowBorder)owner.getBorder() ) {
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151 FlowBorder border = cast(FlowBorder)owner.getBorder();
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152 return border.getInsets(owner).bottom;
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153 }
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154 return 0;
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155 }
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156
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157 static int getBorderDescentWithMargin(InlineFlow owner) {
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158 if (null !is cast(FlowBorder)owner.getBorder() ) {
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159 FlowBorder border = cast(FlowBorder)owner.getBorder();
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160 return border.getBottomMargin() + border.getInsets(owner).bottom;
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161 }
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162 return 0;
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163 }
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164
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165 /**
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166 * Provides a TextLayout that can be used by the Draw2d text package for Bidi. This
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167 * TextLayout should not be disposed by clients. The provided TextLayout's orientation
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168 * will be LTR.
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169 *
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170 * @return an SWT TextLayout that can be used for Bidi
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171 * @since 3.1
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172 */
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173 static TextLayout getTextLayout() {
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174 if (layout is null)
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175 layout = new TextLayout(Display.getDefault());
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176 layout.setOrientation(SWT.LEFT_TO_RIGHT);
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177 return layout;
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178 }
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179
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180 /**
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181 * @param frag
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182 * @param string
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183 * @param font
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184 * @since 3.1
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185 */
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186 private static void initBidi(TextFragmentBox frag, String string, Font font) {
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187 if (frag.requiresBidi()) {
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188 TextLayout textLayout = getTextLayout();
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189 textLayout.setFont(font);
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190 //$TODO need to insert overrides in front of string.
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191 textLayout.setText(string);
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192 }
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193 }
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194
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195 private int measureString(TextFragmentBox frag, String string, int guess, Font font) {
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196 if (frag.requiresBidi()) {
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197 // The text and/or could have changed if the lookAhead was invoked. This will
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198 // happen at most once.
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199 return getTextLayoutBounds(string, font, 0, guess - 1).width;
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200 } else
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201 return getTextUtilities().getStringExtents(string.substring(0, guess), font).width;
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202 }
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203
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204 /**
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205 * Sets up the fragment width based using the font and string passed in.
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206 *
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207 * @param fragment
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208 * the text fragment whose width will be set
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209 * @param font
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210 * the font to be used in the calculation
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211 * @param string
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212 * the string to be used in the calculation
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213 */
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214 final protected void setupFragment(TextFragmentBox fragment, Font font, String string) {
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215 if (fragment.getWidth() is -1 || fragment.isTruncated()) {
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216 int width;
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217 if (string.length is 0 || fragment.length is 0)
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218 width = 0;
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219 else if (fragment.requiresBidi()) {
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220 width = getTextLayoutBounds(string, font, 0, fragment.length - 1).width;
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221 } else
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222 width = getTextUtilities().getStringExtents(string.substring(0, fragment.length), font).width;
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223 if (fragment.isTruncated())
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224 width += getEllipsisWidth(font);
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225 fragment.setWidth(width);
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226 }
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227 }
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228 package void setupFragment_package(TextFragmentBox fragment, Font font, String string) {
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229 setupFragment( fragment, font, string );
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230 }
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231
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232 /**
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233 * Sets up a fragment and returns the number of characters consumed from the given
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234 * String. An average character width can be provided as a hint for faster calculation.
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235 * If a fragment's bidi level is set, a TextLayout will be used to calculate the width.
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236 *
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diff changeset
237 * @param frag the TextFragmentBox
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238 * @param string the String
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diff changeset
239 * @param font the Font used for measuring
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240 * @param context the flow context
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diff changeset
241 * @param wrapping the word wrap style
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diff changeset
242 * @return the number of characters that will fit in the given space; can be 0 (eg., when
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243 * the first character of the given string is a newline)
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diff changeset
244 */
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parents:
diff changeset
245 final protected int wrapFragmentInContext(TextFragmentBox frag, String string,
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parents:
diff changeset
246 FlowContext context, LookAhead lookahead, Font font, int wrapping) {
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diff changeset
247 frag.setTruncated(false);
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diff changeset
248 int strLen = string.length;
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diff changeset
249 if (strLen is 0) {
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diff changeset
250 frag.setWidth(-1);
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diff changeset
251 frag.length = 0;
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diff changeset
252 setupFragment(frag, font, string);
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diff changeset
253 context.addToCurrentLine(frag);
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diff changeset
254 return 0;
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255 }
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diff changeset
256
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diff changeset
257 INTERNAL_LINE_BREAK.setText(string);
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diff changeset
258
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diff changeset
259 initBidi(frag, string, font);
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parents:
diff changeset
260 float avgCharWidth = getAverageCharWidth(frag, font);
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diff changeset
261 frag.setWidth(-1);
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diff changeset
262
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
263 /*
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
264 * Setup initial boundaries within the string.
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diff changeset
265 */
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diff changeset
266 int absoluteMin = 0;
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diff changeset
267 int max, min = 1;
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parents:
diff changeset
268 if (wrapping is ParagraphTextLayout.WORD_WRAP_HARD) {
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diff changeset
269 absoluteMin = INTERNAL_LINE_BREAK.next();
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diff changeset
270 while (absoluteMin > 0 && CharacterIsWhitespace(string[absoluteMin - 1 .. $].firstCodePoint()))
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parents:
diff changeset
271 absoluteMin--;
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diff changeset
272 min = Math.max(absoluteMin, 1);
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273 }
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parents:
diff changeset
274 int firstDelimiter = findFirstDelimeter(string);
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parents:
diff changeset
275 if (firstDelimiter is 0)
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diff changeset
276 min = max = 0;
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diff changeset
277 else
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diff changeset
278 max = Math.min(strLen, firstDelimiter) + 1;
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diff changeset
279
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diff changeset
280
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parents:
diff changeset
281 int availableWidth = context.getRemainingLineWidth();
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diff changeset
282 int guess = 0, guessSize = 0;
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diff changeset
283
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parents:
diff changeset
284 while (true) {
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parents:
diff changeset
285 if ((max - min) <= 1) {
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parents:
diff changeset
286 if (min is absoluteMin
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parents:
diff changeset
287 && context.isCurrentLineOccupied()
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parents:
diff changeset
288 && !context.getContinueOnSameLine()
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parents:
diff changeset
289 && availableWidth < measureString(frag, string, min, font)
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
290 + ((min is strLen && lookahead !is null) ? lookahead.getWidth() : 0)
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
291 ) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
292 context.endLine();
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
293 availableWidth = context.getRemainingLineWidth();
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
294 max = Math.min(strLen, firstDelimiter) + 1;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
295 if ((max - min) <= 1)
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
296 break;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
297 } else
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
298 break;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
299 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
300 // Pick a new guess size
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
301 // New guess is the last guess plus the missing width in pixels
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
302 // divided by the average character size in pixels
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
303 guess += 0.5f + (availableWidth - guessSize) / avgCharWidth;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
304
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
305 if (guess >= max) guess = max - 1;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
306 if (guess <= min) guess = min + 1;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
307
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
308 guessSize = measureString(frag, string, guess, font);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
309
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
310 if (guess is strLen
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
311 && lookahead !is null
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
312 && !canBreakAfter(string.charAt(strLen - 1))
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
313 && guessSize + lookahead.getWidth() > availableWidth) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
314 max = guess;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
315 continue;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
316 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
317
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
318 if (guessSize <= availableWidth) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
319 min = guess;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
320 frag.setWidth(guessSize);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
321 if (guessSize is availableWidth)
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
322 max = guess + 1;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
323 } else
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
324 max = guess;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
325 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
326
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
327 int result = min;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
328 bool continueOnLine = false;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
329 if (min is strLen) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
330 //Everything fits
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
331 if (string.charAt(strLen - 1) is ' ') {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
332 if (frag.getWidth() is -1) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
333 frag.length = result;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
334 frag.setWidth(measureString(frag, string, result, font));
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
335 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
336 if (lookahead.getWidth() > availableWidth - frag.getWidth()) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
337 frag.length = result - 1;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
338 frag.setWidth(-1);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
339 } else
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
340 frag.length = result;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
341 } else {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
342 continueOnLine = !canBreakAfter(string.charAt(strLen - 1));
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
343 frag.length = result;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
344 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
345 } else if (min is firstDelimiter) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
346 //move result past the delimiter
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
347 frag.length = result;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
348 if (string.charAt(min) is '\r') {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
349 result++;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
350 if (++min < strLen && string.charAt(min) is '\n')
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
351 result++;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
352 } else if (string.charAt(min) is '\n')
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
353 result++;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
354 } else if (string.charAt(min) is ' '
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
355 || canBreakAfter(string.charAt(min - 1))
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
356 || INTERNAL_LINE_BREAK.isBoundary(min)) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
357 frag.length = min;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
358 if (string.charAt(min) is ' ')
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
359 result++;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
360 else if (string.charAt(min - 1) is ' ') {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
361 frag.length--;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
362 frag.setWidth(-1);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
363 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
364 } else {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
365 out_:
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
366 // In the middle of an unbreakable offset
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
367 result = INTERNAL_LINE_BREAK.previous(min);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
368 if (result is 0) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
369 switch (wrapping) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
370 case ParagraphTextLayout.WORD_WRAP_TRUNCATE :
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
371 int truncatedWidth = availableWidth - getEllipsisWidth(font);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
372 if (truncatedWidth > 0) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
373 //$TODO this is very slow. It should be using avgCharWidth to go faster
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
374 while (min > 0) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
375 guessSize = measureString(frag, string, min, font);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
376 if (guessSize <= truncatedWidth)
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
377 break;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
378 min--;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
379 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
380 frag.length = min;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
381 } else
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
382 frag.length = 0;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
383 frag.setTruncated(true);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
384 result = INTERNAL_LINE_BREAK.next(max - 1);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
385 goto out_;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
386
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
387 default:
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
388 result = min;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
389 break;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
390 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
391 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
392 frag.length = result;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
393 if (string.charAt(result - 1) is ' ')
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
394 frag.length--;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
395 frag.setWidth(-1);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
396 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
397
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
398 setupFragment(frag, font, string);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
399 context.addToCurrentLine(frag);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
400 context.setContinueOnSameLine(continueOnLine);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
401 return result;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
402 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
403 package int wrapFragmentInContext_package(TextFragmentBox frag, String string,
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
404 FlowContext context, LookAhead lookahead, Font font, int wrapping) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
405 return wrapFragmentInContext( frag, string, context, lookahead, font, wrapping );
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
406 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
407
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
408 /**
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
409 * @see TextLayout#getBounds()
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
410 */
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
411 protected Rectangle getTextLayoutBounds(String s, Font f, int start, int end) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
412 TextLayout textLayout = getTextLayout();
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
413 textLayout.setFont(f);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
414 textLayout.setText(s);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
415 return textLayout.getBounds(start, end);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
416 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
417
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
418 /**
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
419 * Returns an instance of a <code>TextUtililities</code> class on which
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
420 * text calculations can be performed. Clients may override to customize.
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
421 *
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
422 * @return the <code>TextUtililities</code> instance
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
423 * @since 3.4
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
424 */
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
425 protected TextUtilities getTextUtilities() {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
426 return TextUtilities.INSTANCE;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
427 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
428
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
429 /**
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
430 * Gets the ellipsis width.
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
431 *
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
432 * @param font
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
433 * the font to be used in the calculation
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
434 * @return the width of the ellipsis
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
435 * @since 3.4
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
436 */
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
437 private int getEllipsisWidth(Font font) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
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438 return getTextUtilities().getStringExtents(TextFlow.ELLIPSIS, font).width;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
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439 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
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440 }