Hi, you can use QSignalMapper to help you keep track of which spinbox
got clicked on, example:
-----------------------------------------------------------------------------
for (int r = 0; (r < ui->tableWidget->rowCount()); ++r)
for (int c = 0; (c < ui->tableWidget->columnCount()); ++c)
{
auto sb = new QSpinBox();
auto sm = new QSignalMapper(sb);
sm->setMapping(sb,r * ui->tableWidget->columnCount() + c);
CONNECTSRCAST(sb,int,valueChanged,sm,void,map);
CONNECTSCAST(sm,int,mapped,this,on_sb_clicked);
ui->tableWidget->setCellWidget(r,c,sb);
}
-----------------------------------------------------------------------------
QSignalMapper stores the combined row*column number for you, and to
retrieve the signal with that int, create a slot like this:
-----------------------------------------------------------------------------
void MainWindow::on_sb_clicked(int rc)
{
qDebug() << " row = " << rc / ui->tableWidget->columnCount() <<
", column = " << rc % ui->tableWidget->columnCount();
}
-----------------------------------------------------------------------------
Of course this assumes that the columncount is stable throughout your
app :-)
What about CONNECT, what's that macro? I'm so old, I can barely remember
the PMF syntax on a good day, so I wrote these macros to help me, i.e.
getting the benefits of the new connect() syntax with more ease..
-----------------------------------------------------------------------------
#define COMPOSEPMF(QOBJPTR,FUNC) \
&std::decay<decltype(*QOBJPTR)>::type::FUNC
#define CONNECT(SENDER,FUNC1,RECEIVER,FUNC2) \
connect(SENDER,COMPOSEPMF(SENDER,FUNC1),RECEIVER,COMPOSEPMF(RECEIVER,FUNC2))
#define COMPOSECASTPMF(QOBJPTR,ARGS,FUNC) \
static_cast<void (std::decay<decltype(*QOBJPTR)>::type::*)(ARGS)> \
(COMPOSEPMF(QOBJPTR,FUNC))
#define CONNECTSCAST(SENDER,ARGS1,FUNC1,RECEIVER,FUNC2) \
connect(SENDER,COMPOSECASTPMF(SENDER,ARGS1,FUNC1),RECEIVER, \
COMPOSEPMF(RECEIVER,FUNC2))
#define CONNECTRCAST(SENDER,FUNC1,RECEIVER,ARGS2,FUNC2) \
connect(SENDER,COMPOSEPMF(SENDER,FUNC1),RECEIVER, \
COMPOSECASTPMF(RECEIVER,ARGS2,FUNC2))
#define CONNECTSRCAST(SENDER,ARGS1,FUNC1,RECEIVER,ARGS2,FUNC2) \
connect(SENDER,COMPOSECASTPMF(SENDER,ARGS1,FUNC1),RECEIVER, \
COMPOSECASTPMF(RECEIVER,ARGS2,FUNC2))
-----------------------------------------------------------------------------
Rgrds Henry
On 2016-05-03 21:24, Murphy, Sean wrote:
Does anyone have any recommendations for the Right Way to map QWidgets that are
inside QTableWidget cells - populated with QTableWidget::setCellWidget() - back
to the cell index that holds the widget?
When populating the table, I'm putting widgets in various cells (QSpinBoxes for
example). Based on where the QSpinBox is, it needs to be tied to a different
variable. Right now, all the QSpinBox items' valueChanged(int) signals are
connected to one slot, so I can tell that a QSpinBox was changed, but not
necessary which one.
I've got a few ideas of how to get around this, but I'm just wondering if I'm
missing something obvious.
Sean
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