GXT 3 - ColumnConfig.setCell（）不适用于CompositeCell

Question

我正在尝试在单个网格单元格中创建一个包含多个图像的列。 以下是列配置

 private ColumnConfig<SensorTreeModel,ImageResource> actionsCol;
 actionsCol = new ColumnConfig<SensorTreeModel,ImageResource>(new ValueProvider<SensorTreeModel, ImageResource>() {
          com.sencha.project.client.Resources resources = GWT.create(com.sencha.project.client.Resources.class);
            @Override
            public ImageResource getValue(SensorTreeModel object) {

                ImageResource add = com.sencha.project.client.Resources.INSTANCES.add();
                return add;
           }

            @Override
            public void setValue(SensorTreeModel object, ImageResource value) {
              if (object.getIsLeaf()) {

              }
            }

            @Override
            public String getPath() {
              return "actions";
            }
          });
      actionsCol.setHeader("");
      //This is where an error occurs      
     actionsCol.setCell(compositeCell);

我的每个图像单元格如下所示：

public class ImageCell implements HasCell<SensorTreeModel, ImageResource>{
private ImageResourceCell imageCell = new ImageResourceCell();
@Override
public Cell<ImageResource> getCell() {
    // TODO Auto-generated method stub
    return imageCell;
}

@Override
public FieldUpdater<SensorTreeModel, ImageResource> getFieldUpdater() {
    // TODO Auto-generated method stub
    return new FieldUpdater<SensorTreeModel, ImageResource>() {
          @Override
          public void update(int index, SensorTreeModel object, ImageResource value) {
             //object.setLast(ImageResource(value));
          }         
        };
}

@Override
public ImageResource getValue(SensorTreeModel object) {
    // TODO Auto-generated method stub
    return com.sencha.project.client.Resources.INSTANCES.add();
}

}

复合单元格如下所示：

 List<HasCell<SensorTreeModel, ?>> cells= new ArrayList<HasCell<SensorTreeModel,?>>();
      cells.add(new com.sencha.project.client.ImageCell());
      cells.add(new com.sencha.project.client.ImageCell());

      CompositeCell<SensorTreeModel> compositeCell = new CompositeCell<SensorTreeModel>(cells); 

所以，我想要做的是在网格单元格中创建许多图像。我最初创建一个返回图像的ImageCell。现在，我将这些细胞的数量添加到复合细胞上。后来我从actionsCol（列配置）中的setCell函数引用了这个复合单元格。