How do I detect which column was clicked in a QTableview header

mmikeinsantarosa

I need to be able to allow a user to select columns for a table they are presented with. They click on the column header to do this.
I have a public slot defined in class HTCTableViewer as:
void on_myTable_sectionClicked( int index);
and connect up the tableViews header section click signal as:
QObject::connect( ui->tblFileData->horizontalHeader(), SIGNAL( sectionClicked( int ) ), this, SLOT( on_myTable_sectionClicked( int index) ) );
I get No such slot HTCTableViewer::on_myTable_sectionClicked( int index)
And I do have the slot implemented as
void HTCTableViewer::on_myTable_sectionClicked(int index)
{
qDebug() << "Header clicked column - " << index;
}
What am I doing wrong?

mrjj

Hi
for the connect, do not name the parameter, only type

QObject::connect( ui->tblFileData->horizontalHeader(), SIGNAL( sectionClicked( int ) ), this, SLOT( on_myTable_sectionClicked( int index) ) );

index should be removed.

Sabri

Hi,
maybe, subclassing QTableView can achieve what you want.

mmikeinsantarosa

I am only using int in the signal now.
The connection:
QObject::connect( ui->tblFileData->horizontalHeader(), SIGNAL( sectionClicked( int ) ), this, SLOT( on_myTable_sectionClicked( int index) ) );

This didn't work.
application output:
QMetaObject::connectSlotsByName: No matching signal for on_myTable_sectionClicked(int)
QObject::connect: No such slot HTCTableViewer::on_myTable_sectionClicked( int index) in ../ChartTest/htctableviewer.cpp:23

Then I removed "index" from the SLOT connection:
QObject::connect( ui->tblFileData->horizontalHeader(), SIGNAL( sectionClicked( int ) ), this, SLOT( on_myTable_sectionClicked( int ) ) );

And it now works but I had to use a non-matching slot signature:
void on_myTable_sectionClicked( int Value);

I thought the signatures for the SIGNAL & SLOT connection expressions had to match their definitions.

SGaist

Hi,

In what way they don't match ?

From you code, both have one int parameter.

mmikeinsantarosa

@mmikeinsantarosa said in How do I detect which column was clicked in a QTableview header:

on_myTable_sectionClicked( int Value);
the SLOT expression is missing the variable and only has the type. If the actual slot I've defined and implemented to handle the signal looks like
on_myTable_sectionClicked( int Value);
I'd expect the text in the connect expression to match and it doesn't.
on_myTable_sectionClicked( int ) // no variable called Value.

mmikeinsantarosa

Well dang. Now that I actually looked around a bit, I can't find any connect expression that actually includes the type and a variable. I guess I had it in my head they all did and this one was an exception.

Thanks for the help.

mrjj

@mmikeinsantarosa
Hi
just to be clear
You do not name the parameter when using a function in a connect.
Nor for signal OR the slot.

So if you function is like
void MySlot( int ID, QString Name) ( in .h and cpp)

you would only use as
MySlot( int, QString) for connect.