QList of QPair in QML

Sillimon

Hi !
I have a listview to contain with sectors, each of those have a specific number of subparts. I'm using a QList<QPair<QString, int>> but i just realized you can't return it in QML.

I was searching for something like this :

for(var i = 0; i < Card.getSectorAndBlocks().length; i++)
                    {
                        var QList = Card.getSectorAndBlocks()
                        var QPairAti = QList[i]
                        listModel.append({sector: QPairAti.first, numSector: i, nbrModelRepeater: QPairAti.second})
                    }

I then started to search for another solution and someone said : "you could use a QVariantList or QVariantMap which are 'returnable' in QML".

The point is, i don't get what a QVariantList or QVariantMap are used for... What's the difference with other "usual" containers ?

How can i mentally represent the way it "stocks" data and how it is different than a simple QStringList ?

Thanks a lot for future answers !

raven-worx

@Sillimon said in QList of QPair in QML:

The point is, i don't get what a QVariantList or QVariantMap are used for... What's the difference with other "usual" containers ?

when you take a look at the docs you will notice that they are just typedefs for QList<QVariant> and QMap<QString,QVariant>

So to "simulate" a list of QPairs return the following to QML:

QVariantList list;
     QVariantMap pair1;
         pair1.insert("first", "foo");
         pair1.insert("second", "bar");
     list << pair1;
// return list to QML

in QML:

list[0].first // = "foo"
list[0].second // = "bar"

Sillimon

@raven-worx said in QList of QPair in QML:

when you take a look at the docs you will notice that they are just typedefs for QList<QVariant> and QMap<QString,QVariant>

So QVariantList is for QList<QVariant> what QStringList is to QList<String> ?

The only difference i'd see is that QStringList inherits from QList but QVariantList is written as a simple synonym. There might be some differences between both... but anyway it works fine ! Thanks a lot !

raven-worx

@Sillimon said in QList of QPair in QML:

The only difference i'd see is that QStringList inherits from QList but QVariantList is written as a simple synonym

QVariantList a typedef.

QStringList inherits from QList<QString> and adds just some convenience methods.

Sillimon

Fine ! Explanations clear and no more questions, i'll keep those in mind =)
Thank you !