Mercurial > projects > dwt-addons
annotate dwtx/jface/internal/text/link/contentassist/LineBreakingReader.d @ 158:25f1f92fa3df
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| author | Frank Benoit <benoit@tionex.de> |
|---|---|
| date | Tue, 26 Aug 2008 02:46:34 +0200 |
| parents | 6dcb0baaa031 |
| children | 1a5b8f8129df |
| rev | line source |
|---|---|
| 129 | 1 /******************************************************************************* |
| 2 * Copyright (c) 2000, 2006 IBM Corporation and others. | |
| 3 * All rights reserved. This program and the accompanying materials | |
| 4 * are made available under the terms of the Eclipse Public License v1.0 | |
| 5 * which accompanies this distribution, and is available at | |
| 6 * http://www.eclipse.org/legal/epl-v10.html | |
| 7 * | |
| 8 * Contributors: | |
| 9 * IBM Corporation - initial API and implementation | |
| 10 * Port to the D programming language: | |
| 11 * Frank Benoit <benoit@tionex.de> | |
| 12 *******************************************************************************/ | |
| 13 module dwtx.jface.internal.text.link.contentassist.LineBreakingReader; | |
| 14 | |
| 131 | 15 import dwtx.jface.internal.text.link.contentassist.IProposalListener; // packageimport |
| 16 import dwtx.jface.internal.text.link.contentassist.CompletionProposalPopup2; // packageimport | |
| 17 import dwtx.jface.internal.text.link.contentassist.ContextInformationPopup2; // packageimport | |
| 18 import dwtx.jface.internal.text.link.contentassist.ContentAssistMessages; // packageimport | |
| 19 import dwtx.jface.internal.text.link.contentassist.Helper2; // packageimport | |
| 20 import dwtx.jface.internal.text.link.contentassist.PopupCloser2; // packageimport | |
| 21 import dwtx.jface.internal.text.link.contentassist.IContentAssistListener2; // packageimport | |
| 22 import dwtx.jface.internal.text.link.contentassist.ContentAssistant2; // packageimport | |
| 23 import dwtx.jface.internal.text.link.contentassist.AdditionalInfoController2; // packageimport | |
| 24 | |
| 25 | |
| 129 | 26 import dwt.dwthelper.utils; |
| 158 | 27 import dwtx.dwtxhelper.BufferedReader; |
| 28 import dwtx.dwtxhelper.mangoicu.UBreakIterator; | |
| 129 | 29 |
| 30 import dwt.graphics.GC; | |
| 31 | |
| 32 /* | |
| 33 * Not a real reader. Could change if requested | |
| 34 */ | |
| 35 public class LineBreakingReader { | |
| 36 | |
| 37 private BufferedReader fReader; | |
| 38 private GC fGC; | |
| 39 private int fMaxWidth; | |
| 40 | |
| 41 private String fLine; | |
| 42 private int fOffset; | |
| 43 | |
| 158 | 44 private UBreakIterator fLineBreakIterator; |
| 129 | 45 private bool fBreakWords; |
| 46 | |
| 47 /** | |
| 48 * Creates a reader that breaks an input text to fit in a given width. | |
| 158 | 49 * |
| 129 | 50 * @param reader Reader of the input text |
| 51 * @param gc The graphic context that defines the currently used font sizes | |
| 52 * @param maxLineWidth The max width (pixels) where the text has to fit in | |
| 53 */ | |
|
133
7d818bd32d63
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parents:
131
diff
changeset
|
54 public this(Reader reader, GC gc, int maxLineWidth) { |
| 129 | 55 fReader= new BufferedReader(reader); |
| 56 fGC= gc; | |
| 57 fMaxWidth= maxLineWidth; | |
| 58 fOffset= 0; | |
| 59 fLine= null; | |
| 158 | 60 fLineBreakIterator= UBreakIterator.getLineInstance(); |
| 129 | 61 fBreakWords= true; |
| 62 } | |
| 63 | |
| 64 public bool isFormattedLine() { | |
| 65 return fLine !is null; | |
| 66 } | |
| 67 | |
| 68 /** | |
| 69 * Reads the next line. The lengths of the line will not exceed the given maximum | |
| 70 * width. | |
| 158 | 71 * |
| 72 * @return the next line | |
| 73 * @throws IOException | |
| 129 | 74 */ |
|
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6dcb0baaa031
Regex removal of throws decls, some instanceof
Frank Benoit <benoit@tionex.de>
parents:
133
diff
changeset
|
75 public String readLine() { |
| 129 | 76 if (fLine is null) { |
| 77 String line= fReader.readLine(); | |
| 78 if (line is null) | |
| 79 return null; | |
| 80 | |
| 81 int lineLen= fGC.textExtent(line).x; | |
| 82 if (lineLen < fMaxWidth) { | |
| 83 return line; | |
| 84 } | |
| 85 fLine= line; | |
| 86 fLineBreakIterator.setText(line); | |
| 87 fOffset= 0; | |
| 88 } | |
| 89 int breakOffset= findNextBreakOffset(fOffset); | |
| 90 String res; | |
| 158 | 91 if (breakOffset !is UBreakIterator.DONE) { |
| 129 | 92 res= fLine.substring(fOffset, breakOffset); |
| 93 fOffset= findWordBegin(breakOffset); | |
| 94 if (fOffset is fLine.length()) { | |
| 95 fLine= null; | |
| 96 } | |
| 97 } else { | |
| 98 res= fLine.substring(fOffset); | |
| 99 fLine= null; | |
| 100 } | |
| 101 return res; | |
| 102 } | |
| 103 | |
| 104 private int findNextBreakOffset(int currOffset) { | |
| 105 int currWidth= 0; | |
| 106 int nextOffset= fLineBreakIterator.following(currOffset); | |
| 158 | 107 while (nextOffset !is UBreakIterator.DONE) { |
| 129 | 108 String word= fLine.substring(currOffset, nextOffset); |
| 109 int wordWidth= fGC.textExtent(word).x; | |
| 110 int nextWidth= wordWidth + currWidth; | |
| 111 if (nextWidth > fMaxWidth) { | |
| 112 if (currWidth > 0) | |
| 113 return currOffset; | |
| 114 | |
| 115 if (!fBreakWords) | |
| 116 return nextOffset; | |
| 117 | |
| 118 // need to fit into fMaxWidth | |
| 119 int length= word.length(); | |
| 120 while (length >= 0) { | |
| 121 length--; | |
| 122 word= word.substring(0, length); | |
| 123 wordWidth= fGC.textExtent(word).x; | |
| 124 if (wordWidth + currWidth < fMaxWidth) | |
| 125 return currOffset + length; | |
| 126 } | |
| 127 return nextOffset; | |
| 128 } | |
| 129 currWidth= nextWidth; | |
| 130 currOffset= nextOffset; | |
| 131 nextOffset= fLineBreakIterator.next(); | |
| 132 } | |
| 133 return nextOffset; | |
| 134 } | |
| 135 | |
| 136 private int findWordBegin(int idx) { | |
| 137 while (idx < fLine.length() && Character.isWhitespace(fLine.charAt(idx))) { | |
| 138 idx++; | |
| 139 } | |
| 140 return idx; | |
| 141 } | |
| 142 } |