QQmlListProperty, ListView and delegate

cosmoff

Hello everybody

I make a QQmlListProperty<MagicSquare> and I would like to display the attribut 'label' from my class MagicSquare but it does not work. I think that my problem come from QML and not of Qt, so I do not show my code source execept if you need it.

I have in my source code (magicSquareModel.h) :
Q_PROPERTY ( QQmlListProperty<MagicSquare> magicSquareList READ getMagicSquareList NOTIFY magicSquareListChanged )

We can acces to QQmlList thanks to : qmlContext->setContextProperty ( "magicSquareModel", m_magicSquareModel );

So this is my code in Qml :

ListView{

width: parent.width
height: parent.height
model: magicSquareModel.magicSquareList
clip: true

delegate: SimulationMagicSquare{
    width: parent.width * 0.75
    height: virtualModeGraphicIdentity.buttonHeight
    anchors {
        horizontalCenter: parent.horizontalCenter
    }

    title: model.label

}

}
my terminal returns : Unable to assign [undefined] to QString where there is title: model.label (title is just a Text{} )
have you got an idea of the problem ?

Thanks.

dheerendra

magicSquareModel.magicSquareList is not a model. It is just a list property.

cosmoff

Thanks for you answer.

But how can I see my attribut from my magicSquareList in the qml ?

J.Hilk

@cosmoff said in QQmlListProperty, ListView and delegate:

Thanks for you answer.

But how can I see my attribut from my magicSquareList in the qml ?

inside your delegate, you cann access the underlying data via modelData

delegate: SimulationMagicSquare{
    width: parent.width * 0.75
    height: virtualModeGraphicIdentity.buttonHeight
    anchors {
        horizontalCenter: parent.horizontalCenter
    }

    title: modelData.label //here

}

cosmoff

it does not work,

the code is :

ListView{

                id:virtualModeList
                width: parent.width
                height: parent.height
                model: virtualModeModel.virtualModeList
                clip: true

                delegate: SimulationButton{
                    width: parent.width * 0.75
                    height: virtualModeGraphicIdentity.buttonHeight
                    anchors {
                        horizontalCenter: parent.horizontalCenter
                    }

                    title: modelData.label

                }


            }

the terminal returns : Unable to assign [undefined] to QString

dheerendra

What is the data you are trying to expose ? Is it that you have to do QQMLPropertyList ?

cosmoff

I make a :
QQmlListProperty<MagicSquare> MagicSquareModel::getMagicSquareList()
{
return QQmlListProperty<MagicSquare>(this, &m_MagicSquareList,
&MagicSquareModel::MagicSquareListCount,
&MagicSquareModel::MagicSquareListAt);
}

in my class MagicSquare I have an attribut which is QString label and i want to display on the qml

J.Hilk

@cosmoff said in QQmlListProperty, ListView and delegate:

in my class MagicSquare I have an attribut which is QString label and i want to display on the qml

that has to be a Q_PROPERTY or a function that you made available to QML via Q_INVOKABLE

cosmoff

Its= works! I forget to put a Q_PROPERTY for the attribut label...

thanks for your help !