How can I add element to Qt Quick Controls Combobox?

mikecurl91

Hi, sorry but I don't understand... can you give me an example?

Jens

Not sure what you need an example of. This is how you can expose QStandardItemModel to qml from C++:
http://developer.nokia.com/Community/Wiki/Using_QStandardItemModel_in_QML

mikecurl91

@ ComboBox
{
id: comboComs
model: ListModel
{
id: cbItems
ListElement { text: "Banana"; color: "Yellow" }
ListElement { text: "Apple"; color: "Green" }
ListElement { text: "Coconut"; color: "Brown"
}
}
Component.onCompleted:
{
//invoke method on c++ nad get new list of elements
//add element to ListModel
cbItems.append(?????????)
}
@

This is the code I'm tring to use... but the problem is how to populate the ListModel whit new items...
[quote author="Jens" date="1377003595"]Not sure what you need an example of. This is how you can expose QStandardItemModel to qml from C++:
http://developer.nokia.com/Community/Wiki/Using_QStandardItemModel_in_QML[/quote]

Jens

You can check the ListView documentation. It goes something like this:

@
cbItems.append({"text": "Banana", "color": "red"})
@

mikecurl91

It works, but from c++ I've a QList<SerialPortInfo>... so, how can i expose the serialportinfo propreties in the list?
There is compatibility from c++ obj and qml object? So I can do something like this:
@
cbItems.append({"text": "serialport.value(0).name", "color": "red"})
@

Jens

As I previously mention you cannot use ListView directly from C++. Look at the Using QStandardItemModel link I pasted. That is a regular C++ model. you can populate in C++. The documentation for how to use the model in C++ is here: http://qt-project.org/doc/qt-5.0/qtgui/qstandarditemmodel.html
The link I pasted above explains how to make use of it from qml.

mikecurl91

This is what I've tred
@int main(int argc, char *argv[])
{
QGuiApplication app(argc, argv); //preparo l'applicazione
QQmlApplicationEngine engine(QUrl("cn/qml/main.qml")); //carico l'interfaccia
QObject *radice = engine.rootObjects().value(0); //identifico la radice
QQuickWindow *applicationwindow = qobject_cast<QQuickWindow *>(radice); //acquisisco in C++ l'ogg QML ApplicationWindow
if ( !applicationwindow )
{
qWarning("Error: Your root item has to be a Window.");
return -1;
}

Engine motore(radice);
QObject::connect(applicationwindow, SIGNAL(sceneGraphInitialized()),&motore,SLOT(fineCaricamento()));

QStandardItemModel* m = new QStandardItemModel();
QStandardItem* it = new QStandardItem();
it->setData("ciao",0);
it->setData("e.score", 1);
it->setData("ciao",2);

m->appendRow(it);

QQmlContext c(&engine,(radice->findChild<QObject*>("comboCom",Qt::FindChildrenRecursively)));
c.setContextProperty("cbItems",m);


applicationwindow->show();
return app.exec();

}@

and the specific QML is:
@ComboBox
{
id: comboComs
objectName: "comboCom"
model: ListModel
{
id: cbItems
ListElement { text: "Banana"; }
}
}@
but nothing happen...I've no idea what is the problem...
[quote author="Jens" date="1377006040"]As I previously mention you cannot use ListView directly from C++. Look at the Using QStandardItemModel link I pasted. That is a regular C++ model. you can populate in C++. The documentation for how to use the model in C++ is here: http://qt-project.org/doc/qt-5.0/qtgui/qstandarditemmodel.html
The link I pasted above explains how to make use of it from qml.[/quote]

Jens

You don't have to create a ListModel on the qml side. You simply assign the context property itself as the model. I.e "model: cbItems", provided that cbItems is available in the scope.

mikecurl91

So I must delete the ListElement { text: "Banana"; }...
[quote author="Jens" date="1377012579"]You don't have to create a ListModel on the qml side. You simply assign the context property itself as the model. I.e "model: cbItems", provided that cbItems is available in the scope.[/quote]

mikecurl91

I've tryed:
@ComboBox
{
id: comboComs
objectName: "comboCom"
model: m
}
@
@ QStandardItemModel* m = new QStandardItemModel();
QStandardItem* it = new QStandardItem();
it->setData("com1");
m->appendRow(it);
QStandardItem* it2 = new QStandardItem();
it2->setData("com2");
m->appendRow(it2);
@

and I'm getting this error
@"file:///C:/Users/Michele/Desktop/cn/cn/qml/main.qml:106: ReferenceError: m is not defined"@
[quote author="mikecurl91" date="1377012648"]So I must delete the ListElement { text: "Banana"; }...
[quote author="Jens" date="1377012579"]You don't have to create a ListModel on the qml side. You simply assign the context property itself as the model. I.e "model: cbItems", provided that cbItems is available in the scope.[/quote]
[/quote]

[quote author="mikecurl91" date="1377012648"]So I must delete the ListElement { text: "Banana"; }...
[quote author="Jens" date="1377012579"]You don't have to create a ListModel on the qml side. You simply assign the context property itself as the model. I.e "model: cbItems", provided that cbItems is available in the scope.[/quote]
[/quote]

Jens

Your context property is called "cbItems", not "m".

mikecurl91

Ok, no errors...
@ QStandardItemModel* m = new QStandardItemModel();
QStandardItem* it = new QStandardItem();
it->setData(QVariant("com1"));
m->appendRow(it);
QStandardItem* it2 = new QStandardItem();
it2->setData(QVariant("com2"));
m->appendRow(it2);

QQmlContext c(&engine,(radice->findChild<QObject*>("comboCom",Qt::FindChildrenRecursively)));
c.setContextProperty("cbItems",m);@

@ComboBox
{
id: comboComs
objectName: "comboCom"
model: ListModel{
id: cbItems
}
}@

but on combobox nothing appears... :
[quote author="Jens" date="1377013804"]Your context property is called "cbItems", not "m". [/quote]

Jens

As previously mentioned, you are not supposed to create a ListModel when you expose an abstract item model to qml.

@
ComboBox {
id: comboComs
objectName: "comboCom"
model: cbItems
}
@