Gwt CellTable Sorting page by page only

Question

GWT CellTable column sorting page by page only, for each page i have to click the column header for sorting. How to sort whole data on single header click. This is my code,

   dataProvider = new ListDataProvider<List<NamePair>>();
   dataProvider.addDataDisplay(dgrid);
   List<List<NamePair>> list = dataProvider.getList();

   for (List<NamePair> contact : test) {
      dataProvider.setList(test);
      list.add(contact);
   }


   ListHandler<List<NamePair>> columnSortHandler = new ListHandler<List<NamePair>>(dataProvider.getList());
   System.out.println("Column count->"+dgrid.getColumnCount());

   for(int j=0 ; j<dgrid.getColumnCount();j++){             
        final int val = j;
        columnSortHandler.setComparator(dgrid.getColumn(val), new Comparator<List<NamePair>>() {

        public int compare(List<NamePair> o1, List<NamePair> o2) {
          if (o1 == o2) {
            return 0;
         }

         // Compare the column.
         if (o1 != null) {
            int index = val;
            return (o2 != null) ? o1.get(index-2).compareTo(o2.get(index-2)) : 1;
         }
         return -1;
        }
    });
}

dgrid.addColumnSortHandler(columnSortHandler);

score 1 · Accepted Answer · edited Oct 13 '13 at 23:18

I suggest you override ListHandler , override and call super.onColumnSort(ColumnSortEvent) to debug the onColumnSort(ColumnSortEvent) method, you'll understand what is happening very fast.

The source code of the method is pretty direct

public void onColumnSort(ColumnSortEvent event) {
  // Get the sorted column.
  Column<?, ?> column = event.getColumn();
  if (column == null) {
    return;
  }

  // Get the comparator.
  final Comparator<T> comparator = comparators.get(column);
  if (comparator == null) {
    return;
  }

  // Sort using the comparator.
  if (event.isSortAscending()) {
    Collections.sort(list, comparator);
  } else {
    Collections.sort(list, new Comparator<T>() {
      public int compare(T o1, T o2) {
        return -comparator.compare(o1, o2);
      }
    });
  }
}

The only reason why you override ListHandler, is to isolate this table from the others (and avoid having the debugger triggered many times) you can naturally put your breakpoint directly in that method if your project is simple — Zied Hamdi, Oct 12 '13 at 12:28

Gwt CellTable Sorting page by page only

1 Answers1