/*******************************************************************************
* Copyright (c) 2015 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
******************************************************************************/
package org.eclipse.jface.util;
import org.eclipse.swt.events.SegmentEvent;
import org.eclipse.swt.events.SegmentListener;
/**
* Defines the segment listener that enforces Visual Text Direction support.
*
* @since 3.11
*/
/* package */class VisualTextDirectionSegmentListener implements SegmentListener {
private String textDirection;
/**
* Creates a new segment listener that enforces Visual Text Direction
* support.
*
* @param textDir
* the text direction Possible values are:
* <ul>
* <li> {@link BidiUtils#VISUAL_LEFT_TO_RIGHT}
* <li> {@link BidiUtils#VISUAL_RIGHT_TO_LEFT}
* </ul>
*/
public VisualTextDirectionSegmentListener(String textDir) {
textDirection = textDir;
}
@Override
public void getSegments(SegmentEvent event) {
int length = event.lineText.length();
if (length > 0) {
event.segments = new int[2];
event.segments[0] = 0;
event.segments[1] = length;
event.segmentsChars = new char[2];
event.segmentsChars[0] = BidiUtils.VISUAL_RIGHT_TO_LEFT.equals(textDirection)
? BidiUtils.RLO
: BidiUtils.LRO;
event.segmentsChars[1] = BidiUtils.PDF;
}
}
}