Examples with DefaultColumnHeaderDataProvider org.eclipse.nebula.widgets.nattable.grid.data.DefaultColumnHeaderDataProvider used on opensource projects

Example 41 with DefaultColumnHeaderDataProvider

use of org.eclipse.nebula.widgets.nattable.grid.data.DefaultColumnHeaderDataProvider in project nebula.widgets.nattable by eclipse.

the class _6044_HierarchicalTreeLayerGridExample method createExampleControl.

@Override
public Control createExampleControl(Composite parent) {
    // mapping from property to label, needed for column header labels
    Map<String, String> propertyToLabelMap = new HashMap<>();
    propertyToLabelMap.put("manufacturer", "Manufacturer");
    propertyToLabelMap.put("model", "Model");
    propertyToLabelMap.put("motors.identifier", "Identifier");
    propertyToLabelMap.put("motors.capacity", "Capacity");
    propertyToLabelMap.put("motors.capacityUnit", "Capacity Unit");
    propertyToLabelMap.put("motors.maximumSpeed", "Maximum Speed");
    propertyToLabelMap.put("motors.feedbacks.creationTime", "Creation Time");
    propertyToLabelMap.put("motors.feedbacks.classification", "Classification");
    propertyToLabelMap.put("motors.feedbacks.comment", "Comment");
    ConfigRegistry configRegistry = new ConfigRegistry();
    BodyLayerStack bodyLayerStack = new BodyLayerStack(CarService.getInput(), CarService.PROPERTY_NAMES);
    // create the column header layer stack
    IDataProvider columnHeaderDataProvider = new DefaultColumnHeaderDataProvider(CarService.PROPERTY_NAMES, propertyToLabelMap);
    DataLayer columnHeaderDataLayer = new DataLayer(columnHeaderDataProvider);
    ILayer columnHeaderLayer = new ColumnHeaderLayer(columnHeaderDataLayer, bodyLayerStack, bodyLayerStack.getSelectionLayer());
    // add the SortHeaderLayer to the column header layer stack
    final SortHeaderLayer<HierarchicalWrapper> sortHeaderLayer = new SortHeaderLayer<>(columnHeaderLayer, new HierarchicalWrapperSortModel(bodyLayerStack.getSortedList(), bodyLayerStack.getColumnPropertyAccessor(), bodyLayerStack.getTreeLayer().getLevelIndexMapping(), columnHeaderDataLayer, configRegistry), false);
    // create the row header layer stack
    IDataProvider rowHeaderDataProvider = new DefaultRowHeaderDataProvider(bodyLayerStack.getBodyDataProvider());
    ILayer rowHeaderLayer = new RowHeaderLayer(new DataLayer(rowHeaderDataProvider, 40, 20), bodyLayerStack, bodyLayerStack.getSelectionLayer());
    // create the corner layer stack
    ILayer cornerLayer = new CornerLayer(new DataLayer(new DefaultCornerDataProvider(columnHeaderDataProvider, rowHeaderDataProvider)), rowHeaderLayer, sortHeaderLayer);
    // create the grid layer composed with the prior created layer stacks
    GridLayer gridLayer = new GridLayer(bodyLayerStack, sortHeaderLayer, rowHeaderLayer, cornerLayer);
    NatTable natTable = new NatTable(parent, gridLayer, false);
    natTable.setConfigRegistry(configRegistry);
    natTable.addConfiguration(new DefaultNatTableStyleConfiguration() {

        {
            this.vAlign = VerticalAlignmentEnum.TOP;
            this.hAlign = HorizontalAlignmentEnum.LEFT;
            this.cellPainter = new PaddingDecorator(new TextPainter(), 2);
        }
    });
    // adds the key bindings that allows pressing space bar to
    // expand/collapse tree nodes
    natTable.addConfiguration(new TreeLayerExpandCollapseKeyBindings(bodyLayerStack.getTreeLayer(), bodyLayerStack.getSelectionLayer()));
    // add sorting configuration
    natTable.addConfiguration(new SingleClickSortConfiguration());
    natTable.configure();
    return natTable;
}

Example 42 with DefaultColumnHeaderDataProvider

use of org.eclipse.nebula.widgets.nattable.grid.data.DefaultColumnHeaderDataProvider in project nebula.widgets.nattable by eclipse.

the class _6045_HierarchicalTreeLayerExample method createExampleControl.

@Override
public Control createExampleControl(Composite parent) {
    Composite container = new Composite(parent, SWT.NONE);
    container.setLayout(new GridLayout());
    // mapping from property to label, needed for column header labels
    Map<String, String> propertyToLabelMap = new HashMap<>();
    propertyToLabelMap.put("manufacturer", "Manufacturer");
    propertyToLabelMap.put("model", "Model");
    propertyToLabelMap.put("motors.identifier", "Identifier");
    propertyToLabelMap.put("motors.capacity", "Capacity");
    propertyToLabelMap.put("motors.capacityUnit", "Capacity Unit");
    propertyToLabelMap.put("motors.maximumSpeed", "Maximum Speed");
    propertyToLabelMap.put("motors.feedbacks.creationTime", "Creation Time");
    propertyToLabelMap.put("motors.feedbacks.classification", "Classification");
    propertyToLabelMap.put("motors.feedbacks.comment", "Comment");
    ConfigRegistry configRegistry = new ConfigRegistry();
    BodyLayerStack bodyLayerStack = new BodyLayerStack(CarService.getInput(), CarService.PROPERTY_NAMES);
    // create the column header layer stack
    IDataProvider columnHeaderDataProvider = new DefaultColumnHeaderDataProvider(CarService.PROPERTY_NAMES, propertyToLabelMap);
    DataLayer columnHeaderDataLayer = new DataLayer(columnHeaderDataProvider);
    ILayer columnHeaderLayer = new ColumnHeaderLayer(columnHeaderDataLayer, bodyLayerStack, bodyLayerStack.getSelectionLayer());
    // add the SortHeaderLayer to the column header layer stack
    final SortHeaderLayer<HierarchicalWrapper> sortHeaderLayer = new SortHeaderLayer<>(columnHeaderLayer, new HierarchicalWrapperSortModel(bodyLayerStack.getSortedList(), bodyLayerStack.getColumnPropertyAccessor(), bodyLayerStack.getTreeLayer().getLevelIndexMapping(), columnHeaderDataLayer, configRegistry), false);
    // add the filter row functionality
    final FilterRowHeaderComposite<HierarchicalWrapper> filterRowHeaderLayer = new FilterRowHeaderComposite<>(new DefaultGlazedListsFilterStrategy<>(bodyLayerStack.getFilterList(), bodyLayerStack.getColumnPropertyAccessor(), configRegistry), sortHeaderLayer, columnHeaderDataLayer.getDataProvider(), configRegistry);
    filterRowHeaderLayer.addConfigLabelAccumulatorForRegion(GridRegion.FILTER_ROW, new IConfigLabelAccumulator() {

        @Override
        public void accumulateConfigLabels(LabelStack configLabels, int columnPosition, int rowPosition) {
            int columnIndex = filterRowHeaderLayer.getColumnIndexByPosition(columnPosition);
            // header column
            if (columnIndex < 0) {
                configLabels.addLabelOnTop(HierarchicalTreeLayer.LEVEL_HEADER_CELL);
            }
        }
    });
    // create the composite layer composed with the prior created layer
    // stacks
    CompositeLayer compositeLayer = new CompositeLayer(1, 2);
    compositeLayer.setChildLayer(GridRegion.COLUMN_HEADER, filterRowHeaderLayer, 0, 0);
    compositeLayer.setChildLayer(GridRegion.BODY, bodyLayerStack, 0, 1);
    compositeLayer.addConfiguration(new DefaultGridLayerConfiguration(compositeLayer) {

        @Override
        protected void addAlternateRowColoringConfig(CompositeLayer gridLayer) {
        // do nothing to avoid the default grid alternate row coloring
        // needed because the alternate row coloring in the hierarchical
        // tree
        // is based on the spanned cells and not per individual row
        // position
        }
    });
    NatTable natTable = new NatTable(container, compositeLayer, false);
    natTable.setConfigRegistry(configRegistry);
    natTable.addConfiguration(new DefaultNatTableStyleConfiguration() {

        {
            this.vAlign = VerticalAlignmentEnum.TOP;
            this.hAlign = HorizontalAlignmentEnum.LEFT;
            this.cellPainter = new PaddingDecorator(new TextPainter(), 2);
        }
    });
    // add editing configuration
    natTable.addConfiguration(new AbstractRegistryConfiguration() {

        @Override
        public void configureRegistry(IConfigRegistry configRegistry) {
            // make identifier editable
            configRegistry.registerConfigAttribute(EditConfigAttributes.CELL_EDITABLE_RULE, EditableRule.ALWAYS_EDITABLE, DisplayMode.NORMAL, ColumnLabelAccumulator.COLUMN_LABEL_PREFIX + 2);
            // make capacity unit editable
            configRegistry.registerConfigAttribute(EditConfigAttributes.CELL_EDITABLE_RULE, EditableRule.ALWAYS_EDITABLE, DisplayMode.NORMAL, ColumnLabelAccumulator.COLUMN_LABEL_PREFIX + 4);
            configRegistry.registerConfigAttribute(EditConfigAttributes.CELL_EDITOR, new ComboBoxCellEditor("KW", "PS"), DisplayMode.NORMAL, ColumnLabelAccumulator.COLUMN_LABEL_PREFIX + 4);
            configRegistry.registerConfigAttribute(CellConfigAttributes.CELL_PAINTER, new PaddingDecorator(new ComboBoxPainter(), 2), DisplayMode.NORMAL, ColumnLabelAccumulator.COLUMN_LABEL_PREFIX + 4);
            // make comment editable
            configRegistry.registerConfigAttribute(EditConfigAttributes.CELL_EDITABLE_RULE, EditableRule.ALWAYS_EDITABLE, DisplayMode.NORMAL, ColumnLabelAccumulator.COLUMN_LABEL_PREFIX + 8);
        }
    });
    // adds the key bindings that allows pressing space bar to
    // expand/collapse tree nodes
    natTable.addConfiguration(new TreeLayerExpandCollapseKeyBindings(bodyLayerStack.getTreeLayer(), bodyLayerStack.getSelectionLayer()));
    // add sorting configuration
    natTable.addConfiguration(new SingleClickSortConfiguration());
    // add some additional filter configuration
    natTable.addConfiguration(new AbstractRegistryConfiguration() {

        @Override
        public void configureRegistry(IConfigRegistry configRegistry) {
            Style style = new Style();
            style.setAttributeValue(CellStyleAttributes.BACKGROUND_COLOR, GUIHelper.getColor(173, 216, 230));
            configRegistry.registerConfigAttribute(CellConfigAttributes.CELL_STYLE, style, DisplayMode.NORMAL, GridRegion.FILTER_ROW);
        }
    });
    natTable.configure();
    GridDataFactory.fillDefaults().grab(true, true).applyTo(natTable);
    Composite buttonPanel = new Composite(container, SWT.NONE);
    buttonPanel.setLayout(new RowLayout());
    GridDataFactory.fillDefaults().grab(true, false).applyTo(buttonPanel);
    Button collapseAllButton = new Button(buttonPanel, SWT.PUSH);
    collapseAllButton.setText("Collapse All");
    collapseAllButton.addSelectionListener(new SelectionAdapter() {

        @Override
        public void widgetSelected(SelectionEvent e) {
            natTable.doCommand(new TreeCollapseAllCommand());
        }
    });
    Button expandAllButton = new Button(buttonPanel, SWT.PUSH);
    expandAllButton.setText("Expand All");
    expandAllButton.addSelectionListener(new SelectionAdapter() {

        @Override
        public void widgetSelected(SelectionEvent e) {
            natTable.doCommand(new TreeExpandAllCommand());
        }
    });
    Button expandAllFirstLevelButton = new Button(buttonPanel, SWT.PUSH);
    expandAllFirstLevelButton.setText("Expand All First Level");
    expandAllFirstLevelButton.addSelectionListener(new SelectionAdapter() {

        @Override
        public void widgetSelected(SelectionEvent e) {
            natTable.doCommand(new TreeExpandToLevelCommand(0));
        }
    });
    Button toggleExpandButton = new Button(buttonPanel, SWT.PUSH);
    toggleExpandButton.setText("Enable Advanced Expand");
    toggleExpandButton.addSelectionListener(new SelectionAdapter() {

        @Override
        public void widgetSelected(SelectionEvent e) {
            _6045_HierarchicalTreeLayerExample.this.advancedExpandEnabled = !_6045_HierarchicalTreeLayerExample.this.advancedExpandEnabled;
            if (_6045_HierarchicalTreeLayerExample.this.advancedExpandEnabled) {
                toggleExpandButton.setText("Disable Advanced Expand");
                // configure advanced action
                natTable.getUiBindingRegistry().registerFirstSingleClickBinding(_6045_HierarchicalTreeLayerExample.this.treeImagePainterMouseEventMatcher, _6045_HierarchicalTreeLayerExample.this.advancedTreeExpandCollapseAction);
            } else {
                toggleExpandButton.setText("Enable Advanced Expand");
                // configure simple action
                natTable.getUiBindingRegistry().registerFirstSingleClickBinding(_6045_HierarchicalTreeLayerExample.this.treeImagePainterMouseEventMatcher, _6045_HierarchicalTreeLayerExample.this.simpleTreeExpandCollapseAction);
            }
        }
    });
    Button multiReorderButton = new Button(buttonPanel, SWT.PUSH);
    multiReorderButton.setText("Reorder Second Level");
    multiReorderButton.addSelectionListener(new SelectionAdapter() {

        @Override
        public void widgetSelected(SelectionEvent e) {
            List<Integer> fromColumnPositions = Arrays.asList(4, 5);
            natTable.doCommand(new MultiColumnReorderCommand(natTable, fromColumnPositions, 8));
        }
    });
    Button deleteButton = new Button(buttonPanel, SWT.PUSH);
    deleteButton.setText("Delete Row 4");
    deleteButton.addSelectionListener(new SelectionAdapter() {

        @Override
        public void widgetSelected(SelectionEvent e) {
            // remove the element
            HierarchicalWrapper rowObject = bodyLayerStack.getFilterList().remove(3);
            // fire the event to refresh
            bodyLayerStack.getBodyDataLayer().fireLayerEvent(new RowDeleteEvent(bodyLayerStack.getBodyDataLayer(), 3));
            bodyLayerStack.getTreeLayer().cleanupRetainedCollapsedNodes(rowObject);
        }
    });
    return container;
}

Example 43 with DefaultColumnHeaderDataProvider

use of org.eclipse.nebula.widgets.nattable.grid.data.DefaultColumnHeaderDataProvider in project nebula.widgets.nattable by eclipse.

the class _801_VerticalCompositionWithFeaturesExample method createExampleControl.

@Override
public Control createExampleControl(Composite parent) {
    ConfigRegistry configRegistry = new ConfigRegistry();
    Composite panel = new Composite(parent, SWT.NONE);
    GridLayout layout = new GridLayout();
    layout.marginHeight = 0;
    layout.marginWidth = 0;
    panel.setLayout(layout);
    GridDataFactory.fillDefaults().grab(true, true).applyTo(panel);
    Composite gridPanel = new Composite(panel, SWT.NONE);
    gridPanel.setLayout(layout);
    GridDataFactory.fillDefaults().grab(true, true).applyTo(gridPanel);
    Composite buttonPanel = new Composite(panel, SWT.NONE);
    buttonPanel.setLayout(new GridLayout());
    GridDataFactory.fillDefaults().grab(false, false).applyTo(buttonPanel);
    // property names of the Person class
    String[] propertyNames = { "firstName", "lastName", "gender", "married", "birthday" };
    // mapping from property to label, needed for column header labels
    Map<String, String> propertyToLabelMap = new HashMap<>();
    propertyToLabelMap.put("firstName", "Firstname");
    propertyToLabelMap.put("lastName", "Lastname");
    propertyToLabelMap.put("gender", "Gender");
    propertyToLabelMap.put("married", "Married");
    propertyToLabelMap.put("birthday", "Birthday");
    IColumnPropertyAccessor<Person> columnPropertyAccessor = new ExtendedReflectiveColumnPropertyAccessor<>(propertyNames);
    List<Person> values = PersonService.getPersons(10);
    final EventList<Person> eventList = GlazedLists.eventList(values);
    TransformedList<Person, Person> rowObjectsGlazedList = GlazedLists.threadSafeList(eventList);
    // use the SortedList constructor with 'null' for the Comparator because
    // the Comparator will be set by configuration
    SortedList<Person> sortedList = new SortedList<>(rowObjectsGlazedList, null);
    // wrap the SortedList with the FilterList
    FilterList<Person> filterList = new FilterList<>(sortedList);
    IRowDataProvider<Person> bodyDataProvider = new ListDataProvider<>(filterList, columnPropertyAccessor);
    final DataLayer bodyDataLayer = new DataLayer(bodyDataProvider);
    bodyDataLayer.setConfigLabelAccumulator(new ColumnLabelAccumulator());
    GlazedListsEventLayer<Person> eventLayer = new GlazedListsEventLayer<>(bodyDataLayer, filterList);
    final SelectionLayer selectionLayer = new SelectionLayer(eventLayer);
    ViewportLayer viewportLayer = new ViewportLayer(selectionLayer);
    IDataProvider columnHeaderDataProvider = new DefaultColumnHeaderDataProvider(propertyNames, propertyToLabelMap);
    DataLayer columnHeaderDataLayer = new DataLayer(columnHeaderDataProvider);
    ILayer columnHeaderLayer = new ColumnHeaderLayer(columnHeaderDataLayer, viewportLayer, selectionLayer);
    // add sorting
    SortHeaderLayer<Person> sortHeaderLayer = new SortHeaderLayer<>(columnHeaderLayer, new GlazedListsSortModel<>(sortedList, columnPropertyAccessor, configRegistry, columnHeaderDataLayer), false);
    // add the filter row functionality
    final FilterRowHeaderComposite<Person> filterRowHeaderLayer = new FilterRowHeaderComposite<>(new DefaultGlazedListsFilterStrategy<>(filterList, columnPropertyAccessor, configRegistry), sortHeaderLayer, columnHeaderDataProvider, configRegistry);
    // set the region labels to make default configurations work, e.g.
    // editing, selection
    CompositeLayer compositeLayer = new CompositeLayer(1, 2);
    compositeLayer.setChildLayer(GridRegion.COLUMN_HEADER, filterRowHeaderLayer, 0, 0);
    compositeLayer.setChildLayer(GridRegion.BODY, viewportLayer, 0, 1);
    // add edit configurations
    compositeLayer.addConfiguration(new DefaultEditConfiguration());
    compositeLayer.addConfiguration(new DefaultEditBindings());
    // add print support
    compositeLayer.registerCommandHandler(new PrintCommandHandler(compositeLayer));
    compositeLayer.addConfiguration(new DefaultPrintBindings());
    // add excel export support
    compositeLayer.registerCommandHandler(new ExportCommandHandler(compositeLayer));
    compositeLayer.addConfiguration(new DefaultExportBindings());
    final NatTable natTable = new NatTable(gridPanel, compositeLayer, false);
    natTable.setConfigRegistry(configRegistry);
    // adding this configuration adds the styles and the painters to use
    natTable.addConfiguration(new DefaultNatTableStyleConfiguration());
    // add sorting configuration
    natTable.addConfiguration(new SingleClickSortConfiguration());
    natTable.addConfiguration(new AbstractRegistryConfiguration() {

        @Override
        public void configureRegistry(IConfigRegistry configRegistry) {
            configRegistry.registerConfigAttribute(EditConfigAttributes.CELL_EDITABLE_RULE, IEditableRule.ALWAYS_EDITABLE);
            // birthday is never editable
            configRegistry.registerConfigAttribute(EditConfigAttributes.CELL_EDITABLE_RULE, IEditableRule.NEVER_EDITABLE, DisplayMode.NORMAL, ColumnLabelAccumulator.COLUMN_LABEL_PREFIX + 4);
            configRegistry.registerConfigAttribute(EditConfigAttributes.CELL_EDITOR, new ComboBoxCellEditor(Arrays.asList(Gender.FEMALE, Gender.MALE)), DisplayMode.NORMAL, ColumnLabelAccumulator.COLUMN_LABEL_PREFIX + 2);
            configRegistry.registerConfigAttribute(CellConfigAttributes.DISPLAY_CONVERTER, getGenderBooleanConverter(), DisplayMode.NORMAL, ColumnLabelAccumulator.COLUMN_LABEL_PREFIX + 2);
            configRegistry.registerConfigAttribute(EditConfigAttributes.CELL_EDITOR, new ComboBoxCellEditor(Arrays.asList(Boolean.TRUE, Boolean.FALSE)), DisplayMode.NORMAL, ColumnLabelAccumulator.COLUMN_LABEL_PREFIX + 3);
            configRegistry.registerConfigAttribute(CellConfigAttributes.DISPLAY_CONVERTER, new DefaultBooleanDisplayConverter(), DisplayMode.NORMAL, ColumnLabelAccumulator.COLUMN_LABEL_PREFIX + 3);
        }
    });
    natTable.configure();
    final RowSelectionProvider<Person> selectionProvider = new RowSelectionProvider<>(selectionLayer, bodyDataProvider, false);
    GridDataFactory.fillDefaults().grab(true, true).applyTo(natTable);
    Button button = new Button(buttonPanel, SWT.PUSH);
    button.setText("Remove selected item");
    button.addSelectionListener(new SelectionAdapter() {

        @Override
        public void widgetSelected(SelectionEvent e) {
            // the NatTable context
            if (natTable.getActiveCellEditor() != null) {
                natTable.commitAndCloseActiveCellEditor();
            }
            Person item = (Person) ((IStructuredSelection) selectionProvider.getSelection()).getFirstElement();
            eventList.remove(item);
        }
    });
    return panel;
}

Example 44 with DefaultColumnHeaderDataProvider

use of org.eclipse.nebula.widgets.nattable.grid.data.DefaultColumnHeaderDataProvider in project nebula.widgets.nattable by eclipse.

the class GroupByDataLayerTest method addSortingCapability.

void addSortingCapability() {
    this.dataLayer.setComparator(new GroupByComparator<Person>(this.groupByModel, this.columnPropertyAccessor) {

        @Override
        protected boolean isTreeColumn(int columnIndex) {
            // that column index 0 is the tree column
            return columnIndex == 0;
        }
    });
    // the ColumnHeaderDataLayer is needed to retrieve the comparator per
    // column
    IDataProvider columnHeaderDataProvider = new DefaultColumnHeaderDataProvider(this.propertyNames);
    DataLayer columnHeaderDataLayer = new DefaultColumnHeaderDataLayer(columnHeaderDataProvider);
    columnHeaderDataLayer.setConfigLabelAccumulator(new ColumnLabelAccumulator());
    this.sortModel = new GlazedListsSortModel<>(this.sortedList, this.columnPropertyAccessor, this.configRegistry, columnHeaderDataLayer);
    this.dataLayer.initializeTreeComparator(this.sortModel, null, true);
    this.configRegistry.registerConfigAttribute(SortConfigAttributes.SORT_COMPARATOR, DefaultComparator.getInstance());
}

Example 45 with DefaultColumnHeaderDataProvider

use of org.eclipse.nebula.widgets.nattable.grid.data.DefaultColumnHeaderDataProvider in project nebula.widgets.nattable by eclipse.

the class Get_and_set_selected_objects method createExampleControl.

@Override
public Control createExampleControl(Composite parent) {
    Person homer = new Person("Homer", "Simpson", "Sargeant", 1234567890L);
    Person smithers = new Person("Waylon", "Smithers", "Admiral", 6666666666L);
    Person bart = new Person("Bart", "Smithers", "General", 9125798342L);
    Person nelson = new Person("Nelson", "Muntz", "Private", 0000000001L);
    Person frink = new Person("John", "Frink", "Lieutenant", 3141592654L);
    List<Person> myList = new ArrayList<>();
    myList.add(homer);
    myList.add(smithers);
    myList.add(bart);
    myList.add(nelson);
    myList.add(frink);
    String[] propertyNames = { "firstName", "lastName", "rank", "serialNumber" };
    IColumnPropertyAccessor<Person> columnPropertyAccessor = new ReflectiveColumnPropertyAccessor<>(propertyNames);
    IRowDataProvider<Person> bodyDataProvider = new ListDataProvider<>(myList, columnPropertyAccessor);
    DefaultGridLayer gridLayer = new DefaultGridLayer(bodyDataProvider, new DefaultColumnHeaderDataProvider(propertyNames));
    NatTable natTable = new NatTable(parent, gridLayer);
    ISelectionProvider selectionProvider = new RowSelectionProvider<>(gridLayer.getBodyLayer().getSelectionLayer(), bodyDataProvider, // Provides rows where any cell in the row is selected
    false);
    selectionProvider.addSelectionChangedListener(new ISelectionChangedListener() {

        @Override
        public void selectionChanged(SelectionChangedEvent event) {
            System.out.println("Selection changed:");
            IStructuredSelection selection = (IStructuredSelection) event.getSelection();
            @SuppressWarnings("rawtypes") Iterator it = selection.iterator();
            while (it.hasNext()) {
                System.out.println("  " + it.next());
            }
        }
    });
    // Programmatically select a few rows
    selectionProvider.setSelection(new StructuredSelection(new Person[] { homer, smithers, nelson }));
    // I changed my mind. Select a few other rows
    selectionProvider.setSelection(new StructuredSelection(new Person[] { bart, frink }));
    return natTable;
}