GWT Determining Row Value during Cell render

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.
  }
};

It appears to me that I really want the decorator to take my row type, but then the ClickableTextCell won't know how to get the string value it needs. It appears I have to write a custom IconCellDecorator, but thought there was possibly a cleaner solution. — Joel, Jun 26 '12 at 15:35
Just realized that render() has a context which gives an index and key... Thinking this might help. — Joel, Jun 26 '12 at 16:35

score 1 · Answer 1 · answered Jun 26 '12 at 15:35

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.

answered Jun 26 '12 at 15:35

Thomas Broyer

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Wrapping/subclassing ClickableTextCell looks like the awkward part. It s not really meant to handle non-text. I'll look if CompositeCell makes sense. (I've actually made my own IconDecorator that doesn't show a blank area when the icon isn't used. so might need to refactor) – Joel Jun 26 '12 at 16:27

score 0 · Answer 2 · answered Jun 27 '12 at 15:43

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.

GWT Determining Row Value during Cell render

2 Answers2