Re: In GWT, ListHandler<List<String>> columnSortHandler does not sort properly

Your code didn't work, beside it got the problem for non-digit string. Ex: if i sort this list:

Full slide-out QWERTY

Full QWERTY

Full QWERTY

Numeric with T9 multimedia

Soft QWERTY

Slide-out QWERTY

Full QWERTY

Full QWERTY

Slide-out QWERTY

It still didn't show the correct result.

Note: for this table, I have to add the columns dynamically, so i use List<String> for column, not just String.


On Monday, April 22, 2013 7:19:41 PM UTC+10, PhiLho wrote:

On 22/04/2013 10:44, Henry wrote:
> I got these code:
> ///****************************/////////////
>       ListHandler<List<String>> columnSortHandler = new ListHandler<List<String>>(
>                      list);
>              columnSortHandler.setComparator(nameColumn,
>                      new Comparator<List<String>>() {
>                        public int compare(List<String> o1, List<String> o2) {
>                          if (o1 == o2) {
>                            return 0;
>                          }
>
>                          // Compare the name columns.
>                          if (o1 != null) {
>                            return (o2 != null) ? o1.get(0).compareTo(o2.get(0)) : 1;
>                          }
>                          return -1;
>                        }
>                      });
>
>                  table.addColumnSortHandler(columnSortHandler);
>
> ///****************************/////////////
[...]
> Is there anything wrong with the code above?

public int compare(List<String> o1, List<String> o2) {
     return o1.get(0).compareTo(o2.get(0));
}

But in this case, the default comparator provided by GWT will do the same job.
I did that for a numerical comparison of values with units, for example:

@Override
public int compare(List<String> o1, List<String> o2)
{
     String v1 = o1.get(columnIndex);
     String v2 = o2.get(columnIndex);
     double d1 = DataService.parseValue(v1);
     double d2 = DataService.parseValue(v2);
     if (d1 == 0 && d2 == 0)
         return v1.compareTo(v2); // String comparison
     return Double.compare(d1, d2);
}

The DataService.parseValue() parses the double at the start of the string, stopping on the
unit symbol.
The columnIndex is a member of my Comparator, since we do the same sorting for all columns.

--
Philippe Lhoste
--  (near) Paris -- France
--  http://Phi.Lho.free.fr
--  --  --  --  --  --  --  --  --  --  --  --  --  --

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