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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 org.apache.log4j.Logger;
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import org.eclipse.jface.text.TextViewer;
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import org.eclipse.swt.custom.StyledText;
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import org.eclipse.swt.events.ModifyEvent;
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import org.eclipse.swt.events.ModifyListener;
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import org.eclipse.ui.forms.IManagedForm;
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import org.eclipse.ui.forms.widgets.ScrolledForm;
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/**
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* Checks whether the ScrolledForm a TextViewer is on needs to be
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* redrawn because of a new line break or the removal of an existing
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* one ...
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* <p>
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* ... in theory, anyway. Until I figure out how to detect a word wrap,
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* the ScrolledForm is redrawn with every modify event.
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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 class LineWrapSupport {
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private static final Logger logger = Logger
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.getLogger(LineWrapSupport.class);
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ModifyListener listener = new LineWrapListener();
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int lineCount;
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private StyledText textWidget;
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private ScrolledForm scrolledForm;
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// private TextViewer viewer;
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/**
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* <p>Constructor for LineWrapSupport.</p>
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*
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* @param viewer a {@link org.eclipse.jface.text.TextViewer} object.
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* @param form a {@link org.eclipse.ui.forms.IManagedForm} object.
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*/
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// public TextViewer getViewer() {
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// return viewer;
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// }
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public LineWrapSupport(TextViewer viewer, IManagedForm form) {
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if (viewer == null) {
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throw new IllegalArgumentException(
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"The provided TextViewer object is null.");
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}
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// this.viewer = viewer;
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textWidget = viewer.getTextWidget();
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textWidget.addModifyListener(listener);
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this.lineCount = textWidget.getLinePixel(textWidget.getLineCount());
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this.scrolledForm = form.getForm();
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logger.trace(this.getClass().getSimpleName() + " created");
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}
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/**
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* Redraws the scrolledForm if a line wrap is detected.
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*/
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private void checkLineCount() {
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boolean lineWrapDetected = true;
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if (lineWrapDetected ) {
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scrolledForm.getBody().layout();
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}
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}
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/**
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* Calls <code>checkLineCount()</code> on a modify event.
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*
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* @author p.ciardelli
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* @created 21.05.2008
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* @version 1.0
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*/
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class LineWrapListener implements ModifyListener {
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public void modifyText(ModifyEvent e) {
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checkLineCount();
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}
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}
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}
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