Java TableViewer - change cell image on selection

Question

I have followed Vogella's tutorial on Table Viewer and using the StyledCellLabelProvider presented there. It creates a CHECKED or UNCHECKED icon on the third column

    col = createTableViewerColumn(titles[3], bounds[3], 3);
    col.setLabelProvider(new ColumnLabelProvider() {
        @Override
        public String getText(Object element) {
            return null;
        }

        @Override
        public Image getImage(Object element) {
            if (((Person) element).isMarried()) {
                return CHECKED;
            } else {
                return UNCHECKED;
            }
        }
    });
    col.setEditingSupport(new MarriedEditingSupport(viewer));

The column images get painted accordingly when the table is created but how can I change the icon when the user clicks a cell ? (I want to simulate a check box)

Answer 1

You can use an EditingSupport class based on CheckboxCellEditor for this:

class MarriedEditingSupport extends EditingSupport
{
  private final CheckboxCellEditor _editor;

  MarriedEditingSupport(TableViewer viewer)
  {
    super(viewer);

    _editor = new CheckboxCellEditor(viewer.getTable());
  }

  @Override
  protected CellEditor getCellEditor(Object element)
  {
    return _editor;
  }

  @Override
  protected boolean canEdit(Object element)
  {
    return true;
  }

  @Override
  protected Object getValue(Object element)
  {
    return Boolean.valueOf(((Person)element).isMarried());
  }

  @Override
  protected void setValue(Object element, Object value)
  {
    ((Person)element).setMarried(((Boolean)value).booleanValue());

    getViewer().update(element, null);
  }
}