| ColumnLabelProvider reusable ? [message #333821] |
Wed, 07 January 2009 11:15  |
Eclipse User |
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Originally posted by: rune.molin.cph.dk
I was looking into how to provide a tooltip for an entire row in a
tableviewer for an RCP app i'm working on when I came across the new
(as of 3.3) API of ColumnLabelProvider, TableViewerColumn etc.
Google found me some articles explaining why this is a good thing
because you could reuse a labelprovider, for example like this:
public class StockValueProvider extends ColumnLabelProvider {
@Override
public String getText(Object element) {
return ((Stock)element).modification.doubleValue() + "%";
}
Now, what I don't get is why this is supposed to be reusable in any
relevant way - The way I see it, the only case you can use this
StockValueProvider is when you have a public "modification" attribute in
a Stock class. What if this modification attribute is a member of
another class, but I still want it displayed with a percentage sign
appended. Then I write another label provider ? Am I missing something
obvious here ?
So anyway, how do you implement a tooltip that pertains to the entire
row, and not just one column :0)
-- Cheers
Rune Molin
Software Developer
Copenhagen Airports
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| Re: ColumnLabelProvider reusable ? [message #333835 is a reply to message #333833] |
Wed, 07 January 2009 17:54  |
| Eclipse User |
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Hi Rune,
Rune Molin schrieb:
> Hi Tom,
>
> Ah - Very clever. My experience in generics is not that extensive, but wont
>
> new DelegatingColumnLabelProvider(
> new DelegateAccessor<Author, BigDecimal)() {
> ...
> }
> );
>
> result in a ClassCastException when
>
> public String getText(Object element) {
> return delegateAccessor.getValue(element);
> }
>
Sure as you noticed I invented this while writing the mail so you should
check for null and then call .toString().
Tom
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