List of QPairs or QHash to qml

ODБOï

Hi,
I need a list Q_PROPERTY containing pair values like (150 , 300) that i can expose to qml and access it like

myPropName[index].first and myPropName[index].second

what is the best solution for this please ?

I tryed :

Q_PROPERTY(QQmlPropertyMap programSizes READ get_programSizes NOTIFY programSizesChanged)

but im not sure this can be done, i have errors when trying to write accessor for it

i also try to put QPairs in QVariantList but could not do it

QPair<double, double> pairHeightWidth;
pairHeightWidth.first= qAbs(progHeight)
pairHeightWidth.second = qAbs(progWidth);
/*QVariantList*/ m_progSizes << pairHeightWidth

ODБOï

@J.Hilk

did like this

Q_PROPERTY(QVariantList progSizes READ getProgSizes WRITE setProgSizes NOTIFY progSizesChanged)
private:
QVariantList  m_progSizes 
... 
...{
        QVariantMap pair;
        pair.insert("width",999);
        pair.insert("height",66);
        m_progSizes << pair;
}
...

 property variant ps: parser.progSizes
 onPsChanged: {
    console.log("prog 0 heigh/width : " + ps[0].height + "/" + ps[0].width)
}

@J-Hilk thanks for help

J.Hilk

@LeLev
try it as a pure QVariant

Q_PROPERTY(QVariant programSizes READ get_programSizes NOTIFY programSizesChanged)

with
QVariant get_programSizes(){QVariant::fromValue(m_programSizes);}

ODБOï

@J.Hilk hi,
thank you.
I tryed like this :

 Q_PROPERTY(QVariant programSizes READ get_programSizes WRITE set_programSizes NOTIFY programSizesChanged)
...
QPair<double, double> pairHeightWidth;
    pairHeightWidth.first = qAbs(progWidth);
    pairHeightWidth.second = qAbs(progHeight);

    m_progSizes << QVariant::fromValue(pairHeightWidth);

this works but when i pass this Q_PROPERTY to another object through SIGNAL/SLOT

QObject::connect(parser,&ProgramParser::programSizesChanged,this,&ThreadsafeParser::set_programSizes);

i have this output :
QObject::connect: Cannot queue arguments of type 'QVariant&'
(Make sure 'QVariant&' is registered using qRegisterMetaType().)

How/where i have to register QVariant& please ?

ODБOï

making my signal arg const solved this error
void programSizesChanged(const QVariant &mp);
instead of
void programSizesChanged( QVariant &mp);

J.Hilk

@LeLev said in List of QPairs or QHash to qml:

How/where i have to register QVariant& please ?

you use qRegisterMetaType usually like this:

qRegisterMetaType<MyStruct>();

where you call it, doesn't matter much, just make sure that you call it before you make the first connection that uses the type

ODБOï

@J.Hilk thank you,
sorry i made an error in my previously pasted code,

this dont work, is m_programSizes is a QVariant

QPair<double, double> pairHeightWidth;
 pairHeightWidth.first = qAbs(progWidth);
 pairHeightWidth.second = qAbs(progHeight);

 m_programSizes << QVariant::fromValue(pairHeightWidth);

ODБOï

this works :

m_programSizes.setValue(QVariant::fromValue(pairHeightWidth));

but how to read this qml side now ?

i only got

 property variant progSizes: parser.programSizes
    onProgSizesChanged: {
        for (var i in progSizes ){
            console.log(i)
        }

output
QVariant(QPair<double,double>, )

ODБOï

@LeLev
i will try this
https://forum.qt.io/topic/87558/qlist-of-qpair-in-qml

J.Hilk

@LeLev im not sure if you can, as first and second are not defined as properties., inside the Pair class

ODБOï

@J.Hilk

did like this

Q_PROPERTY(QVariantList progSizes READ getProgSizes WRITE setProgSizes NOTIFY progSizesChanged)
private:
QVariantList  m_progSizes 
... 
...{
        QVariantMap pair;
        pair.insert("width",999);
        pair.insert("height",66);
        m_progSizes << pair;
}
...

 property variant ps: parser.progSizes
 onPsChanged: {
    console.log("prog 0 heigh/width : " + ps[0].height + "/" + ps[0].width)
}

@J-Hilk thanks for help