How to make sure "cellTable.getColumnSortList().push" sort column Descending?

Question

I want myCellTable to sort qtyColumn descending. That is the ones with highest qty will be on top.

myCellTable.getColumnSortList().push(qtyColumn);
myCellTable.getColumnSortList().push(qtyColumn);
//someone said we have to do the push twice. I did but it still sort Asc. 
So I think the above code doesn't seem elegant

I just need 1 simple code that guarantee that the table will show data with qty column sorted desc.

So, How to show table with qty column sorted desc?

Note: I found this public ColumnSortList.ColumnSortInfo(Column<?,?> column, boolean ascending) but don't know how to use it?

Tried many way but it didn't work.

myCellTable.getColumnSortList().push(new ColumnSortInfo(qtyColumn, false)); // not working

 //this is also not working
 ColumnSortInfo sortInfo = myCellTable.getColumnSortList().push(qtyColumn);
 if (sortInfo.isAscending()) {
        myCellTable.getColumnSortList().push(qtyColumn);

 }

Answer 1

this seems to work, not sure if it has any problem:

table.getColumnSortList().clear();
table.getColumnSortList().push(column);
table.getColumnSortList().push(column);                 
ColumnSortEvent.fire(table, table.getColumnSortList());

Answer 2

Workaround : If nothing is working then simply pass a already sorted List to the CellTable or ListDataProvider as per your initial sorting.

use Collections.sort()

Its working perfectly for me.

Sample code : (sort by name descending)

    Collections.sort(contactList,new Comparator<Contact>() {

        @Override
        public int compare(Contact o1, Contact o2) {
            return o2.name.compareTo(o1.name);
        }
    });

    // Create a data provider.
    ListDataProvider<Contact> dataProvider = new ListDataProvider<Contact>(contactList);

    // Connect the table to the data provider.
    dataProvider.addDataDisplay(table);

---

Find a sample code below for sorting on header column's click.

• ColumnSorting with ListDataProvider

Answer 3

Try calling

setVisibleRangeAndClearData(Range range, boolean forceRangeChangeEvent)

on cell table with second parameter true to force RangeChangeEvent right after push call.