How to use CheckBoxTableCell in TableViewerColumn

Question

I'm unable to find any examples that use CheckBoxTableCell in a TableViewerColumn if someone could provide me with an example implementation I would be very grateful.

I already have a working model that shows some string values but I'm unable to represent a boolean value as a checkbox.

Is it even possible to show anything else except a String in a TableViewerColumn?

Answer 1

Here is an example with a checkbox in the TableViewerColumn. It uses an image to represent a bolean in the cell.

It creates a custom view which extends ViewPart with two static fields to hold the image :

Image CHECKED = Activator.getImageDescriptor("icons/checked.gif").createImage();
Image UNCHECKED = Activator.getImageDescriptor("icons/unchecked.gif").createImage();

Then in the createColumns method just return one of the images depending in the value of the boolean :

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;
    }
  }
});

Please check the link given above for more details.

If you want an editable checkbox, you need to create an EditingSupport object for the column you want to have a checkbox.

Here is an example :

public class CheckBoxColumnEditingSupport extends EditingSupport {

    private TableViewer tableViewer;

    public CheckBoxColumnEditingSupport(TableViewer viewer) {
        super(viewer);
        this.tableViewer = viewer;
    }

    @Override
    protected CellEditor getCellEditor(Object o) {
        return new CheckboxCellEditor(null, SWT.CHECK);
    }

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

    @Override
    protected Object getValue(Object o) {
        ORMData ormData = (ORMData) o;
        return ormData.isOrmIndicator();
    }

    @Override
    protected void setValue(Object element, Object value) {
        ORMData ormData = (ORMData) element;
        ormData.setOrmIndicator((Boolean) value);
        tableViewer.refresh();
    }
}

And then add that editing support to specific column in your table:

tableViewerColumn.setEditingSupport(new CheckBoxColumnEditingSupport (myTableViewer));

See this turotial on how to use Column Editing Support. Also this detailed post on How to add an editable checkbox at JFace TableViewer