eu.etaxonomy.taxeditor.bulkeditor/src/main/java/eu/etaxonomy/taxeditor/annotatedlineeditor/LineSelectionViewer.java

   1 // $Id$
   2 /**
   3 * Copyright (C) 2007 EDIT
   4 * European Distributed Institute of Taxonomy
   5 * http://www.e-taxonomy.eu
   6 *
   7 * The contents of this file are subject to the Mozilla Public License Version 1.1
   8 * See LICENSE.TXT at the top of this package for the full license terms.
   9 */
  10
  11 package eu.etaxonomy.taxeditor.annotatedlineeditor;
  12
  13 import org.apache.log4j.Logger;
  14 import org.eclipse.jface.text.IRegion;
  15 import org.eclipse.jface.text.ITextSelection;
  16 import org.eclipse.jface.text.Region;
  17 import org.eclipse.jface.text.TextSelection;
  18 import org.eclipse.jface.text.source.IOverviewRuler;
  19 import org.eclipse.jface.text.source.IVerticalRuler;
  20 import org.eclipse.jface.text.source.SourceViewer;
  21 import org.eclipse.jface.viewers.ISelection;
  22 import org.eclipse.jface.viewers.SelectionChangedEvent;
  23 import org.eclipse.swt.widgets.Composite;
  24
  25 import eu.etaxonomy.taxeditor.model.LineSelection;
  26
  27 /**
  28  * Notifies selection service every time the user changes focus to a new line.
  29  *
  30  * @author p.ciardelli
  31  * @created 03.07.2009
  32  * @version 1.0
  33  */
  34 public class LineSelectionViewer extends SourceViewer {
  35         @SuppressWarnings("unused")
  36         private static final Logger logger = Logger
  37                         .getLogger(LineSelectionViewer.class);
  38
  39         private int lastLine = 0;
  40         private ILineSelectionSource lineSelectionSource;
  41
  42         /**
  43          * <p>Constructor for LineSelectionViewer.</p>
  44          *
  45          * @param parent a {@link org.eclipse.swt.widgets.Composite} object.
  46          * @param verticalRuler a {@link org.eclipse.jface.text.source.IVerticalRuler} object.
  47          * @param overviewRuler a {@link org.eclipse.jface.text.source.IOverviewRuler} object.
  48          * @param showAnnotationsOverview a boolean.
  49          * @param styles a int.
  50          */
  51         public LineSelectionViewer(Composite parent, IVerticalRuler verticalRuler,
  52                         IOverviewRuler overviewRuler, boolean showAnnotationsOverview,
  53                         int styles) {
  54                 super(parent, verticalRuler, overviewRuler, showAnnotationsOverview, styles);
  55
  56 //              createLineChangeListeners();
  57                 setLineSelectionSource(new LineSelectionSource(this));
  58         }
  59
  60         /* (non-Javadoc)
  61          * @see org.eclipse.jface.text.TextViewer#getSelection()
  62          */
  63         /** {@inheritDoc} */
  64         @Override
  65         public ISelection getSelection() {
  66                 ISelection selection = super.getSelection();
  67                 if (getDocument() != null) {
  68                         selection = createLineSelection((TextSelection) selection);
  69                 }
  70                 return selection;
  71         }
  72
  73         /**
  74          * <p>Setter for the field <code>lineSelectionSource</code>.</p>
  75          *
  76          * @param lineSelectionSource a {@link eu.etaxonomy.taxeditor.annotatedlineeditor.ILineSelectionSource} object.
  77          */
  78         public void setLineSelectionSource(ILineSelectionSource lineSelectionSource) {
  79                 this.lineSelectionSource = lineSelectionSource;
  80         }
  81
  82
  83         /* (non-Javadoc)
  84          * @see org.eclipse.jface.text.TextViewer#firePostSelectionChanged(int, int)
  85          */
  86         /** {@inheritDoc} */
  87         @Override
  88         protected void firePostSelectionChanged(int offset, int length) {
  89                 if (redraws()) {
  90                         IRegion r= widgetRange2ModelRange(new Region(offset, length));
  91                         ITextSelection textSelection= r != null ? new TextSelection(getDocument(), r.getOffset(), r.getLength()) : TextSelection.emptySelection();
  92                         LineSelection lineSelection = createLineSelection(textSelection);
  93                         SelectionChangedEvent event= new SelectionChangedEvent(this, lineSelection);
  94                         fireSelectionChanged(event);
  95                 }
  96         }
  97
  98         /**
  99          * Creates a new instance of a LineSelection based on a given ITextSelection
 100          *
 101          * @param textSelection
 102          * @return
 103          */
 104         private LineSelection createLineSelection(ITextSelection textSelection) {
 105                 if (textSelection instanceof LineSelection ) {
 106                         return (LineSelection) textSelection;
 107                 }
 108                 int line = textSelection.getStartLine();
 109                 Object selectionObject = lineSelectionSource.getSelectedObjectAtLine(line);
 110                 return new LineSelection(textSelection, getDocument(), selectionObject);
 111         }
 112 }