How to use

SelectionCell

in

com.google.gwt.cell.client

private void setOptions(List<String> allowedValues) {
  delegate = new SelectionCell(allowedValues);
}

@Override
public void render(Context context, String value, SafeHtmlBuilder sb) {
 // Get the view data.
 Object key = context.getKey();
 String viewData = getViewData(key);
 if (viewData != null && viewData.equals(value)) {
  clearViewData(key);
  viewData = null;
 }
 int selectedIndex = getSelectedIndex(viewData == null ? value : viewData);
 sb.appendHtmlConstant("<select tabindex=\"-1\">");
 int index = 0;
 for (String option : options) {
  if (index++ == selectedIndex) {
   sb.append(template.selected(option));
  } else {
   sb.append(template.deselected(option));
  }
 }
 sb.appendHtmlConstant("</select>");
}

@Override
public void onBrowserEvent(Context context, Element parent, String value,
  NativeEvent event, ValueUpdater<String> valueUpdater) {
 super.onBrowserEvent(context, parent, value, event, valueUpdater);
 String type = event.getType();
 if (BrowserEvents.CHANGE.equals(type)) {
  Object key = context.getKey();
  SelectElement select = parent.getFirstChild().cast();
  String newValue = options.get(select.getSelectedIndex());
  setViewData(key, newValue);
  finishEditing(parent, newValue, key, valueUpdater);
  if (valueUpdater != null) {
   valueUpdater.update(newValue);
  }
 }
}

@Override
public void render(Context context, String value, SafeHtmlBuilder sb) {
 // Get the view data.
 Object key = context.getKey();
 String viewData = getViewData(key);
 if (viewData != null && viewData.equals(value)) {
  clearViewData(key);
  viewData = null;
 }
 int selectedIndex = getSelectedIndex(viewData == null ? value : viewData);
 sb.appendHtmlConstant("<select tabindex=\"-1\">");
 int index = 0;
 for (String option : options) {
  if (index++ == selectedIndex) {
   sb.append(template.selected(option));
  } else {
   sb.append(template.deselected(option));
  }
 }
 sb.appendHtmlConstant("</select>");
}

public ListModelListBoxCell(final Renderer<T> renderer) {
  this.renderer = renderer;
  delegate = new SelectionCell(new ArrayList<String>()); // just to avoid null pointer in setSelection()
}

@Override
public void onBrowserEvent(Context context, Element parent, String value,
  NativeEvent event, ValueUpdater<String> valueUpdater) {
 super.onBrowserEvent(context, parent, value, event, valueUpdater);
 String type = event.getType();
 if (BrowserEvents.CHANGE.equals(type)) {
  Object key = context.getKey();
  SelectElement select = parent.getFirstChild().cast();
  String newValue = options.get(select.getSelectedIndex());
  setViewData(key, newValue);
  finishEditing(parent, newValue, key, valueUpdater);
  if (valueUpdater != null) {
   valueUpdater.update(newValue);
  }
 }
}

@Override
public void render(Context context, String value, SafeHtmlBuilder sb) {
 // Get the view data.
 Object key = context.getKey();
 String viewData = getViewData(key);
 if (viewData != null && viewData.equals(value)) {
  clearViewData(key);
  viewData = null;
 }
 int selectedIndex = getSelectedIndex(viewData == null ? value : viewData);
 sb.appendHtmlConstant("<select tabindex=\"-1\">");
 int index = 0;
 for (String option : options) {
  if (index++ == selectedIndex) {
   sb.append(template.selected(option));
  } else {
   sb.append(template.deselected(option));
  }
 }
 sb.appendHtmlConstant("</select>");
}

public GlusterConfigAwareCell() {
  super(BrowserEvents.CHANGE);
  delegate = new SelectionCell(new ArrayList<String>());
  textInputCell = new TextInputCell();
}

@Override
public void onBrowserEvent(Context context, Element parent, String value,
  NativeEvent event, ValueUpdater<String> valueUpdater) {
 super.onBrowserEvent(context, parent, value, event, valueUpdater);
 String type = event.getType();
 if (BrowserEvents.CHANGE.equals(type)) {
  Object key = context.getKey();
  SelectElement select = parent.getFirstChild().cast();
  String newValue = options.get(select.getSelectedIndex());
  setViewData(key, newValue);
  finishEditing(parent, newValue, key, valueUpdater);
  if (valueUpdater != null) {
   valueUpdater.update(newValue);
  }
 }
}

private Column<ItemObjectModel, String> setUpResolverColumn() {
  ArrayList<String> options = new ArrayList<String>();
  options.add( "----" );
  options.add( ItemObjectModel.REFLECTION_RESOLVER );
  options.add( ItemObjectModel.MVEL_RESOLVER );
  Column<ItemObjectModel, String> column = new Column<ItemObjectModel, String>( new SelectionCell( options ) ) {
    @Override
    public String getValue( ItemObjectModel input ) {
      if ( input.getResolver() == null ) {
        return "----";
      } else {
        return input.getResolver();
      }
    }
  };
  column.setFieldUpdater( new FieldUpdater<ItemObjectModel, String>() {
    @Override
    public void update( int index,
              ItemObjectModel model,
              String value ) {
      model.setResolver( value );
    }
  } );
  return column;
}

@SuppressWarnings("unchecked")
private void setOptions(ListModel model) {
  Iterable<T> items = model.getItems();
  if (items == null) {
    items = new ArrayList<>();
  }
  entityByName = new HashMap<>();
  List<String> options = new ArrayList<>();
  for (T entity : items) {
    String entityName = renderer.render(entity);
    entityByName.put(entityName, entity);
    options.add(entityName);
  }
  delegate = new SelectionCell(options);
}

values.add(noLiteral);
Column<TableEntry<Boolean>, String> column = new Column<TableEntry<Boolean>, String>(new SelectionCell(values)) {
  @Override
  public String getValue(TableEntry<Boolean> model) {

collectList.add("Default");
SelectionCell collectSelection = new SelectionCell(collectList);

final SelectionCell levelCell = new SelectionCell(levels);
final Column<LogUiLogger, String> colLevel = new Column<LogUiLogger, String>(levelCell) {
  @Override