TableView "setData" decimal

[NotYourFan]

Hey i have a TableView.
i have 4 inputfields and 3 "calculate Fields".

That works all fine, but now i calculate something and i get for example:

1834.123093843

i want to get only the first 3 digits.
my setData function looks like this:

bool ParameterCalculate::setData(const QModelIndex &indexIn, const QVariant &value, int role)
{
   row.at(indexIn.row())->getField().at(indexIn.column()).setMathCalculate(value.toDouble());
}

Any Idea how i can get only the first 2 - 4 digits?

Thanks

[Christian Ehrlicher]

Return a properly adjusted value in your data() function.

[NotYourFan]

how can i get only the first 2 Digits? In data i also have

switch(role)
{
case Qt::DisplayRole:
return actualMath.toString();
..
..


}

[VRonin]

@Christian-Ehrlicher said in TableView "setData" decimal:

Return a properly adjusted value in your data() function.

NO!!!!!!!

data() is pure data. How it is shown on the screen is a job for the delegate

class DecimalsDelegate : public QStyledItemDelegate {
Q_OBJECT
Q_DISABLE_COPY(DecimalsDelegate)
public:
explicit DecimalsDelegate(QObject* parent = Q_NULLPTR) 
:QStyledItemDelegate(parent)
,m_numDec(3)
{}
unsigned int decimals() const {return m_numDec;}
void setDecimals(unsigned int val){m_numDec=val;}
QString  displayText(const QVariant &value, const QLocale &locale) const Q_DECL_OVERRIDE{
switch(value.type()){
case QMetaType::Double:
return locale.toString(value.toDouble(),'f',m_numDec);
case QMetaType::Float:
return locale.toString(value.toFloat(),'f',m_numDec);
default:
return QStyledItemDelegate::displayText(value,locale);
}
}
private:
unsigned int m_numDec;
};

Now you can use tableView->setItemDelegate(new DecimalsDelegate(tableView));