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where to use setAutoCreat

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  where to use setAutoCreat "Ray Ma" <ray.ma@THRWHITE.remove-dii-this> - 2011-04-27 15:38 +0000
    Re: where to use setAutoC "Ray Ma" <ray.ma@THRWHITE.remove-dii-this> - 2011-04-27 15:38 +0000

#2254 — where to use setAutoCreat

  To: comp.lang.java.gui
Hi, all,

I have a customized JTable and I use the Java 6.0 feature:
    table.setAutoCreateRowSorter(true)
to enable auto sorting on rows.

So when I add a new row to the table if the auto rowSorter is turned
on for a certain column (after I clicked on one column header to
enable the rowSorter), the new row will automatically jump to the
position according to the sorting result.

But I want the new row always at the end of the table when added. So I
want to turn off the auto sorting when adding a new row. I check the
java document and find the only possible method I can all on JTable,
or tableModel is
    table.setAutoCreateRowSorter(false);

I add the line in my table.addRow() method but it doesn't work, the
sorter still executes.
    public void addRow (MyObject rowData){
            this. setAutoCreateRowSorter(false);
            this.getModel.addRow(rowData);
}

 I wonder how can I achieve my goal. i.e. use the autoRowSorter given
by JTable but disable it when new row is added to my table untill next
time user click on a column to activate the sorter again.


BTW, The doc for the setAutoCreateRowSorter() method is:
/**
     * Specifies whether a {@code RowSorter} should be created for the
     * table whenever its model changes.
     * <p>
     * When {@code setAutoCreateRowSorter(true)} is invoked, a {@code
     * TableRowSorter} is immediately created and installed on the
     * table.  While the {@code autoCreateRowSorter} property remains
     * {@code true}, every time the model is changed, a new {@code
     * TableRowSorter} is created and set as the table's row sorter.
*/
It doesn't tell clearly about what happen or when should set it to
false.

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#2258 — Re: where to use setAutoC

  To: comp.lang.java.gui
I have a walk around that can disable the RowSorter. I find one tricky
thing is that even if you call:
      table.getRowSorter().setSortable(columnIndex,false);
if you have called:
      setSortable(columnIndex,true);
previously, it's actually still using the last sorting rule that you
apply to your table column, when the column sortable set to true.
e.g. If you have a quantity field and you click once: sort in
ascending order; twice: sort in descending order; then you call
setSortable(colIndex,false) and you add a new row, you'll find you can
no longer click on the table header to sort a column, BUT if you add a
new row, it is still added using descending order.

The right way is to use: table.setRowSorter(null) when you want to
disable column sorting.

The following code can achieve:
3 clicks on table header,1st: sort ascendingly, 2nd sort descendingly,
3rd disable sorter

class MyTable extends JTable{

 int headerClickCount =0;
 private TableRowSorter<XXTableModel> sorter =null;

 MyTable(TableModel tableModel){
    super(tableModel);
    ......
    sorter = new TableRowSorter(this.getTableModel());

 }
/**add mouse listener for mouse clicking on table header*/
public void addMouseListenerForHeader(){
        this.getTableHeader().addMouseListener(new MouseAdapter(){
            public void mousePressed(MouseEvent e){
                    headerClickCount++;
                    if(headerClickCount==3){
                        MyTable.this.setRowSorter(null);
                        headerClickCount=0;
                    }
                    else{
                        if(MyTable.this.getRowSorter()==null)
                            sorter.setModel(MyTable.this.tableModel);//
Must reset tableModel to the sorter
                        MyTable.this.setRowSorter(sorter);
                    }
                }
              });
 }

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