Mercurial > projects > dwt-win
annotate dwt/custom/BidiSegmentEvent.d @ 315:349b8c12e243
Sync dwt/custom with dwt-linux
| author | Frank Benoit <benoit@tionex.de> |
|---|---|
| date | Tue, 07 Oct 2008 16:18:26 +0200 |
| parents | fd9c62a2998e |
| children |
| rev | line source |
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parents:
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1 /******************************************************************************* |
| 246 | 2 * Copyright (c) 2000, 2008 IBM Corporation and others. |
| 155 | 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 dwt.custom.BidiSegmentEvent; | |
| 14 | |
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349b8c12e243
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parents:
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diff
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15 import dwt.dwthelper.utils; |
|
349b8c12e243
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parents:
246
diff
changeset
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16 |
| 155 | 17 |
| 18 import dwt.events.TypedEvent; | |
| 19 import dwt.custom.StyledTextEvent; | |
| 20 | |
| 21 /** | |
| 22 * This event is sent to BidiSegmentListeners when a line is to | |
| 23 * be measured or rendered in a bidi locale. The segments field is | |
| 24 * used to specify text ranges in the line that should be treated as | |
| 25 * separate segments for bidi reordering. Each segment will be reordered | |
| 26 * and rendered separately. | |
| 27 * <p> | |
| 28 * The elements in the segments field specify the start offset of | |
| 29 * a segment relative to the start of the line. They must follow | |
| 30 * the following rules: | |
| 31 * <ul> | |
| 32 * <li>first element must be 0 | |
| 33 * <li>elements must be in ascending order and must not have duplicates | |
| 34 * <li>elements must not exceed the line length | |
| 35 * </ul> | |
| 36 * In addition, the last element may be set to the end of the line | |
| 37 * but this is not required. | |
| 38 * | |
| 39 * The segments field may be left null if the entire line should | |
| 40 * be reordered as is. | |
| 41 * </p> | |
| 42 * A BidiSegmentListener may be used when adjacent segments of | |
| 43 * right-to-left text should not be reordered relative to each other. | |
| 44 * For example, within a Java editor, you may wish multiple | |
| 45 * right-to-left string literals to be reordered differently than the | |
| 46 * bidi algorithm specifies. | |
| 47 * | |
| 48 * Example: | |
| 49 * <pre> | |
| 50 * stored line = "R1R2R3" + "R4R5R6" | |
| 51 * R1 to R6 are right-to-left characters. The quotation marks | |
| 52 * are part of the line text. The line is 13 characters long. | |
| 53 * | |
| 54 * segments = null: | |
| 55 * entire line will be reordered and thus the two R2L segments | |
| 56 * swapped (as per the bidi algorithm). | |
| 57 * visual line (rendered on screen) = "R6R5R4" + "R3R2R1" | |
| 58 * | |
| 59 * segments = [0, 5, 8] | |
| 60 * "R1R2R3" will be reordered, followed by [blank]+[blank] and | |
| 61 * "R4R5R6". | |
| 62 * visual line = "R3R2R1" + "R6R5R4" | |
| 63 * </pre> | |
| 246 | 64 * |
| 65 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> | |
| 155 | 66 */ |
| 67 public class BidiSegmentEvent : TypedEvent { | |
| 68 | |
| 69 /** | |
| 70 * line start offset | |
| 71 */ | |
| 72 public int lineOffset; | |
| 73 | |
| 74 /** | |
| 75 * line text | |
| 76 */ | |
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77 public String lineText; |
| 155 | 78 |
| 79 /** | |
| 80 * bidi segments, see above | |
| 81 */ | |
| 82 public int[] segments; | |
| 83 | |
| 84 this(StyledTextEvent e) { | |
| 85 super(cast(Object)e); | |
| 86 lineOffset = e.detail; | |
| 87 lineText = e.text; | |
| 88 } | |
| 89 } |