Selecting QComboBox in QTableWidget

Question

One cell in each row of a QTableWidget contains a combobox

for (each row in table ... ) {
   QComboBox* combo = new QComboBox();      
   table->setCellWidget(row,col,combo);             
   combo->setCurrentIndex(node.type());                 
   connect(combo, SIGNAL(currentIndexChanged(int)),this, SLOT(changed(int)));
   ....
}

In the handler function ::changed(int index) I have

QComboBox* combo=(QComboBox*)table->cellWidget(_row,_col);  
combo->currentIndex()

To get back a copy of the combobox and get the new selection.
But I can't get the row/col.
None of the table cellXXXX signals is emitted when an embedded item is selected or changed and currentRow()/currentColumn() aren't set.

Answer 1

No need for the signal mapper... When the combobox is created you can simply add two custom properties to it:

combo->setProperty("row", (int) nRow);
combo->setProperty("col", (int) nCol);

In the handler function you can get a pointer back to the sender of the signal (your combobox).

Now by asking for the properties you can have your row/col back:

int nRow = sender()->property("row").toInt();
int nCol = sender()->property("col").toInt();