GWT在单元格渲染期间确定行值

Question

I'd like to determine whether an icon is used based on the value of the "row" value that is in the CellTable (or DataGrid). How do I determine that when building the Cell renderer?

IconCellDecorator<String> icd = new IconCellDecorator<String>(res.search(), new ClickableTextCell()) {
  @Override
  protected boolean isIconUsed(String value) {
    //value may not be unique across rows (column value), I really need the row instance here.
  }
};

Answer 1

If you need the row object, you'll have to use an IconCellDecorator<RowObject> , and wrap or subclass the ClickableTextCell to extract the String out of the RowObject .

Or you could use a CompositeCell and ImageResourceCell instead of the IconCellDecorator .

Answer 2

I decided to rewrite IconCellDecorator so that the getImageUsed method passes in the Context object, which gives me the row index and key. This seemed the most straightforward for specifically what I was trying to accomplish, although Thomas' answer should work as well.