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/**
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* Copyright (C) 2007 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.taxeditor.editor.name.container;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Scanner;
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import org.eclipse.swt.custom.StyledText;
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import org.eclipse.swt.events.KeyListener;
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import org.eclipse.swt.events.VerifyEvent;
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import org.eclipse.swt.events.VerifyListener;
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/**
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* Checks text entered into a StyledText widget for line breaks, sends
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* split text to abstract method handleSplitText().
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* <p>
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* VerifyListener interface methods break up the text into lines. Each line is sent individually
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* to the handleSplitText() method when the KeyListener interface method keyReleased() is called.
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* This is because if the StyledText widget is disposed before the key is released, an SWT
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* exception occurs.
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* <p>
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* The listener should be set on the StyledText widget as follows:
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* <code><pre>
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* StyledText styledText = new SourceViewer().getTextWidget();
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* LineBreakListener lineBreakListener = new LineBreakListener() {
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* public void handleSplitText(String text) {
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* ... some operation ...
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* }
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* };
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*
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* styledText.addVerifyListener(lineBreakListener);
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* styledText.addKeyListener(lineBreakListener);
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* </pre></code>
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*
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* @author p.ciardelli
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* @created 19.05.2008
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* @version 1.0
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*/
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public abstract class LineBreakListener implements VerifyListener{
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private static String LINE_BREAK = System.getProperty("line.separator");
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/**
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* {@inheritDoc}
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*
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* Checks for 3 conditions of name viewer text:
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* 1) no line breaks in text
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* 2) line break at the end of the text
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* 3) line break in the middle of the text
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* @see org.eclipse.swt.events.VerifyListener#verifyText(org.eclipse.swt.events.VerifyEvent)
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*/
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public void verifyText(VerifyEvent e) {
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String verifyText = e.text;
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StyledText styledText = (StyledText) e.widget;
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String widgetText = styledText.getText();
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int cursorPosition = styledText.getCaretOffset();
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// If no line break in verifyText, Parse text normally
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if (!verifyText.contains(LINE_BREAK)) {
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return;
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}
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// Don't add verifyText without further processing
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e.doit = false;
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// If user has entered return at the end of the line,
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// make a new, empty synonym
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if (widgetText.length() == cursorPosition &&
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verifyText.equals(LINE_BREAK)) {
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handleSplitText("");
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return;
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}
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// Concatenate old and new texts
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String textForSplitting = widgetText.substring(0, cursorPosition)
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+ verifyText
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+ widgetText.substring(cursorPosition);
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// Split on line breaks
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Scanner scanner = new Scanner( textForSplitting );
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scanner.useDelimiter(LINE_BREAK);
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// Put first string into name viewer
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styledText.setText(scanner.next());
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// Start new synonyms with the rest
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while (scanner.hasNext()) {
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handleSplitText(scanner.next());
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}
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}
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/**
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* <p>handleSplitText</p>
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*
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* @param text a {@link java.lang.String} object.
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*/
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abstract public void handleSplitText(String text);
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}
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