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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.annotatedlineeditor;
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import org.apache.log4j.Logger;
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import org.eclipse.jface.text.IRegion;
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import org.eclipse.jface.text.ITextSelection;
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import org.eclipse.jface.text.Region;
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import org.eclipse.jface.text.TextSelection;
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import org.eclipse.jface.text.source.IOverviewRuler;
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import org.eclipse.jface.text.source.IVerticalRuler;
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import org.eclipse.jface.text.source.SourceViewer;
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import org.eclipse.jface.viewers.ISelection;
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import org.eclipse.jface.viewers.SelectionChangedEvent;
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import org.eclipse.swt.widgets.Composite;
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import eu.etaxonomy.taxeditor.model.LineSelection;
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/**
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* Notifies selection service every time the user changes focus to a new line.
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*
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* @author p.ciardelli
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* @created 03.07.2009
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* @version 1.0
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*/
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public class LineSelectionViewer extends SourceViewer {
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@SuppressWarnings("unused")
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private static final Logger logger = Logger
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.getLogger(LineSelectionViewer.class);
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private int lastLine = 0;
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private ILineSelectionSource lineSelectionSource;
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/**
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* <p>Constructor for LineSelectionViewer.</p>
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*
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* @param parent a {@link org.eclipse.swt.widgets.Composite} object.
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* @param verticalRuler a {@link org.eclipse.jface.text.source.IVerticalRuler} object.
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* @param overviewRuler a {@link org.eclipse.jface.text.source.IOverviewRuler} object.
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* @param showAnnotationsOverview a boolean.
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* @param styles a int.
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*/
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public LineSelectionViewer(Composite parent, IVerticalRuler verticalRuler,
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IOverviewRuler overviewRuler, boolean showAnnotationsOverview,
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int styles) {
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super(parent, verticalRuler, overviewRuler, showAnnotationsOverview, styles);
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// createLineChangeListeners();
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setLineSelectionSource(new LineSelectionSource(this));
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}
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/* (non-Javadoc)
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* @see org.eclipse.jface.text.TextViewer#getSelection()
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*/
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/** {@inheritDoc} */
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@Override
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public ISelection getSelection() {
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ISelection selection = super.getSelection();
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if (getDocument() != null) {
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selection = createLineSelection((TextSelection) selection);
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}
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return selection;
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}
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/**
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* <p>Setter for the field <code>lineSelectionSource</code>.</p>
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*
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* @param lineSelectionSource a {@link eu.etaxonomy.taxeditor.annotatedlineeditor.ILineSelectionSource} object.
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*/
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public void setLineSelectionSource(ILineSelectionSource lineSelectionSource) {
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this.lineSelectionSource = lineSelectionSource;
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}
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/* (non-Javadoc)
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* @see org.eclipse.jface.text.TextViewer#firePostSelectionChanged(int, int)
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*/
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/** {@inheritDoc} */
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@Override
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protected void firePostSelectionChanged(int offset, int length) {
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if (redraws()) {
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IRegion r= widgetRange2ModelRange(new Region(offset, length));
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ITextSelection textSelection= r != null ? new TextSelection(getDocument(), r.getOffset(), r.getLength()) : TextSelection.emptySelection();
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LineSelection lineSelection = createLineSelection(textSelection);
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SelectionChangedEvent event= new SelectionChangedEvent(this, lineSelection);
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fireSelectionChanged(event);
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}
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}
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/**
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* Creates a new instance of a LineSelection based on a given ITextSelection
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*
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* @param textSelection
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* @return
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*/
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private LineSelection createLineSelection(ITextSelection textSelection) {
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if (textSelection instanceof LineSelection ) {
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return (LineSelection) textSelection;
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}
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int line = textSelection.getStartLine();
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Object selectionObject = lineSelectionSource.getSelectedObjectAtLine(line);
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return new LineSelection(textSelection, getDocument(), selectionObject);
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}
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}
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