Qtableview enter in column0

n-2204

I just need to enter 1,2,3-- in all the rows of column0 means row 0 so 1 like that.

    QAbstractItemModel* table1 = ui.tableView->model();
    int iRows = table1->rowCount();
    int iCols = table1->columnCount();
    for (int row = 0;row < iRows;row++) {
        int col = 0;
        for (int i = 1;i <= iRows;i++) {
            QModelIndex index = model->index(row, col);
            model->setData(index, i);
        }
    }

n-2204

any other way to do or what changes in the code ?

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