[Qt-interest] Infinite loop with QHeaderView::sortIndicatorChanged

[Malyushytsky, Alex]

I have not test it, but I think sortByColumn(logicalIndex, order); changes sortIndicator.
Try to change MDPMainWindow::sort_by_column, so it does not call iself, something like this:

void MDPMainWindow::sort_by_column(int logicalIndex, Qt::SortOrder order)
{
disconnect(tx_table_view_->horizontalHeader(), SIGNAL( sortIndicatorChanged(int, Qt::SortOrder) ),
            this,               SLOT( sort_by_column(int, Qt::SortOrder) ) );
    tx_table_view_->sortByColumn(logicalIndex, order);

connect(tx_table_view_->horizontalHeader(), SIGNAL( sortIndicatorChanged(int, Qt::SortOrder) ),
            this,               SLOT( sort_by_column(int, Qt::SortOrder) ) );
}

Regards,

Alex



From: qt-interest-bounces at trolltech.com [mailto:qt-interest-bounces at trolltech.com] On Behalf Of Stephen Collyer
Sent: Saturday, May 16, 2009 12:44 PM
To: qtInterest
Subject: [Qt-interest] Infinite loop with QHeaderView::sortIndicatorChanged

I'm trying to implement column sorting in a QTableView. I have
code like so:

connect(tx_table_view_->horizontalHeader(), SIGNAL( sortIndicatorChanged(int, Qt::SortOrder) ),
            this,               SLOT( sort_by_column(int, Qt::SortOrder) ) );

 ...

void MDPMainWindow::sort_by_column(int logicalIndex, Qt::SortOrder order)
{
    tx_table_view_->sortByColumn(logicalIndex, order);
}

where sort_by_column is a slot in the current class, and tx_table_view_
is a QTableView*.

When I click on a sort indicator in the header, sort_by_column(..) is called
in some kind of infinite loop until the app dumps core. I guess the call
to QTableView::sortByColumn is causing the signal to be reemitted for
some reason, but I can't see why.

Can someone explain what I'm doing wrong here ?

--
Stephen Collyer


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