Qtableview enter in column0

[VRonin]

QAbstractItemModel* table1 = ui.tableView->model();
for (int i = 0, maxI=table1->rowCount();i <= maxI;++i)
table1->setData(table1->index(i,0), i+1);

[n-2204]

Thanks its working
But when i am adding new row then in that row number is not coming in column 0. ?what other change required

[VRonin]

Smells like you are trying to reinvent the headers... in any case:

QObject::connect(table1,QAbstractItemModel::rowsInserted,table1,[table1](const QModelIndex &parent, int first, int last){
for(int i=first;i<=last;++i)
table1->setData(table1->index(i,0,parent), i+1);
});

[n-2204]

getting error
i am adding row like this
void tool::on_pushButton_Clicked()
{
model->insertRow(model->rowCount(QModelIndex()));
}

[VRonin]

getting error

Yes it was a typo but the error tells you clearly what to do, you could figure it out...

QObject::connect(table1,&QAbstractItemModel::rowsInserted,table1,[table1](const QModelIndex &parent, int first, int last){
for(int i=first;i<=last;++i)
table1->setData(table1->index(i,0,parent), i+1);
});

[n-2204]

@VRonin is it possible to add alpabets in column 0 in every row ?
code--
QAbstractItemModel* table1 = ui.tableView->model();
for (char i = 'A';i <= 'Z';++i)
table->setData(table->index(i, 0), i );

[VRonin]

The second argument of setData is what determines what will appear in the cell. You don't need to change the loop that is iterating over the rows:

QAbstractItemModel* table1 = ui.tableView->model();
for (int i = 0, maxI=table1->rowCount();i <= maxI;++i)
table1->setData(table1->index(i,0), QChar('A'+i));

[n-2204]

Ok so using setdata
in col 6 i need to perform operation i.e. col6=col5/col4
connect(ui.tableView->model(), SIGNAL(dataChanged(QModelIndex, QModelIndex)),
SLOT(UpdateData(QModelIndex, QModelIndex)));
}
void tool::UpdateData(const QModelIndex& indexA, const QModelIndex& indexB)
{
QAbstractItemModel* table1 = ui.tableView->model();
for (int i = 0, maxI = table1->rowCount();i <= maxI;++i) {
int valor1 =table1->data(table1->index(i, 4)).toInt();
int valor2 = table1->data(table1->index(i, 5)).toInt();
table1->setData(table1->index(i, 6), valor2 / valor1);
}
}
as initially there is no data in col so it throws exception error (/0) how to prevent this
getting exception error
please help

[VRonin]

@n-2204 said in Qtableview enter in column0:

as initially there is no data in col so it throws exception error (/0)

You already identified the problem, you just need an if to work around it

[n-2204]

@VRonin yes i tried using if but not able to solve the problem

[VRonin]

@n-2204 said in Qtableview enter in column0:

i tried using if

What did you try?

[n-2204]

@VRonin
QAbstractItemModel* table1 = ui.tableView->model();
for (int i = 0, maxI = table1->rowCount();i <= maxI;++i) {
int valor1 =table1->data(table1->index(i, 4)).toInt();
int valor2 = table1->data(table1->index(i, 5)).toInt();
if (valor1==0 || valor2== 0)
valor1 = 16, valor2 = 37;
table1->setData(table1->index(i, 6), valor2 / valor1);
}
i assign some initial values but now every row will update first with some data is there any other way to overcome from exception and this calculation will work?

[VRonin]

You are SOOOOO close to the solution!
2 more hints:

• whatever valor2 is, it's never a problem, only the denominator causes the div0 error
• you don't need to assign default values, you can just set it to be blank if it would cause an error

[n-2204]

@VRonin said in Qtableview enter in column0:

You are SOOOOO close to the solution!
2 more hints:

• whatever valor2 is, it's never a problem, only the denominator causes the div0 error
  yes right
• you don't need to assign default values, you can just set it to be blank if it would cause an error

int valor2 = table1->data(table1->index(i, 5)).toInt();
if (valor1==0 || valor2== 0)
table1->setData(table1->index(i, 6), " "); //this is correct way
table1->setData(table1->index(i, 6), valor2 / valor1);

blank in setdata
can you plz tell how to set blank ?
Thanks in advance

[VRonin]

@n-2204 said in Qtableview enter in column0:

can you plz tell how to set blank ?

pass QVariant() as the second argument to setData