import com.google.gwt.cell.client.HasCell; //导入依赖的package包/类
private com.google.gwt.user.cellview.client.Column initActionsColumn() {
    List<HasCell<DataGridFilterSummary, ?>> cells = new LinkedList<HasCell<DataGridFilterSummary, ?>>();

    cells.add(new RemoveActionHasCell("Remove",
                                      new ActionCell.Delegate<DataGridFilterSummary>() {
                                          @Override
                                          public void execute(DataGridFilterSummary filter) {
                                              gridPreferenceStore.removeCustomFilter(filter.getFilterName());
                                              refreshGrid();
                                          }
                                      }));

    CompositeCell<DataGridFilterSummary> cell = new CompositeCell<DataGridFilterSummary>(cells);
    com.google.gwt.user.cellview.client.Column<DataGridFilterSummary, DataGridFilterSummary> actionsColumn = new com.google.gwt.user.cellview.client.Column<DataGridFilterSummary, DataGridFilterSummary>(
            cell) {
        @Override
        public DataGridFilterSummary getValue(DataGridFilterSummary object) {
            return object;
        }
    };
    return actionsColumn;
}
 

import com.google.gwt.cell.client.HasCell; //导入依赖的package包/类
/**
 * Fire an event to the Cell within the specified {@link TableCellElement}.
 */
private <C> void fireEventToCell(Event event, String eventType, Element parentElem,
                                 final T rowValue, Context context, HasCell<T, C> column) {
    // Check if the cell consumes the event.
    Cell<C> cell = column.getCell();
    if (!cellConsumesEventType(cell, eventType)) {
        return;
    }

    C cellValue = column.getValue(rowValue);
    boolean cellWasEditing = cell.isEditing(context, parentElem, cellValue);
    if (column instanceof Column) {
      /*
       * If the HasCell is a Column, let it handle the event itself. This is
       * here for legacy support.
       */
        Column<T, C> col = (Column<T, C>) column;
        col.onBrowserEvent(context, parentElem, rowValue, event);
    } else {
        // Create a FieldUpdater.
        final FieldUpdater<T, C> fieldUpdater = column.getFieldUpdater();
        final int index = context.getIndex();
        ValueUpdater<C> valueUpdater = (fieldUpdater == null) ? null : (value) -> {
            fieldUpdater.update(index, rowValue, value);
        };

        // Fire the event to the cell.
        cell.onBrowserEvent(context, parentElem, cellValue, event, valueUpdater);
    }

    // Reset focus if needed.
    cellIsEditing = cell.isEditing(context, parentElem, cellValue);
    if (cellWasEditing && !cellIsEditing) {
        CellBasedWidgetImpl.get().resetFocus(() -> {
            setFocus(true);
        });
    }
}
 

import com.google.gwt.cell.client.HasCell; //导入依赖的package包/类
@Override
protected <X> void render(Context context, GlobalPermissionEnum value,
		SafeHtmlBuilder sb, HasCell<GlobalPermissionEnum, X> hasCell) {
	Cell<X> cell = hasCell.getCell();
	sb.appendHtmlConstant("<td>");
	cell.render(context, hasCell.getValue(value), sb);
	sb.appendHtmlConstant("</td>");
}