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annotate dwt/custom/BidiSegmentEvent.d @ 13:f565d3a95c0a

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Ported dwt.internal
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Fri, 22 Aug 2008 16:46:34 +0200
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 *
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f565d3a95c0a Ported dwt.internal
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11 * Port to the D programming language:
0
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12 * Jacob Carlborg <jacob.carlborg@gmail.com>
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13 *******************************************************************************/
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14 module dwt.custom.BidiSegmentEvent;
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16 import dwt.custom.StyledTextEvent;
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17 import dwt.events.TypedEvent;
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19 import dwt.dwthelper.string;
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20
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21 /**
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22 * This event is sent to BidiSegmentListeners when a line is to
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23 * be measured or rendered in a bidi locale. The segments field is
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24 * used to specify text ranges in the line that should be treated as
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25 * separate segments for bidi reordering. Each segment will be reordered
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26 * and rendered separately.
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27 * <p>
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28 * The elements in the segments field specify the start offset of
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29 * a segment relative to the start of the line. They must follow
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30 * the following rules:
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31 * <ul>
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32 * <li>first element must be 0
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33 * <li>elements must be in ascending order and must not have duplicates
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34 * <li>elements must not exceed the line length
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35 * </ul>
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36 * In addition, the last element may be set to the end of the line
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37 * but this is not required.
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38 *
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39 * The segments field may be left null if the entire line should
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40 * be reordered as is.
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41 * </p>
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42 * A BidiSegmentListener may be used when adjacent segments of
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43 * right-to-left text should not be reordered relative to each other.
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44 * For example, within a Java editor, you may wish multiple
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45 * right-to-left String literals to be reordered differently than the
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46 * bidi algorithm specifies.
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47 *
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48 * Example:
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49 * <pre>
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50 * stored line = "R1R2R3" + "R4R5R6"
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51 * R1 to R6 are right-to-left characters. The quotation marks
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52 * are part of the line text. The line is 13 characters long.
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53 *
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54 * segments = null:
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55 * entire line will be reordered and thus the two R2L segments
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56 * swapped (as per the bidi algorithm).
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57 * visual line (rendered on screen) = "R6R5R4" + "R3R2R1"
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58 *
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59 * segments = [0, 5, 8]
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60 * "R1R2R3" will be reordered, followed by [blank]+[blank] and
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61 * "R4R5R6".
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62 * visual line = "R3R2R1" + "R6R5R4"
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63 * </pre>
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64 */
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65 public class BidiSegmentEvent : TypedEvent {
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66
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67 /**
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68 * line start offset
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69 */
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70 public int lineOffset;
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71
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72 /**
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73 * line text
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74 */
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75 public String lineText;
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76
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77 /**
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78 * bidi segments, see above
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79 */
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80 public int[] segments;
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81
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82 static final long serialVersionUID = 3257846571587547957L;
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83
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84 this (StyledTextEvent e) {
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85 super(e);
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86 lineOffset = e.detail;
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87 lineText = e.text;
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88 }
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89 }