Connecting a dynamic QMap to Qml

Maxim DC

Let's say i have a QMap<MyKey*, MyObject*> myobjects, it it possible to connect this to qml through QQmlListProperty<MyObject>

PS: MyKey is not needed in qml, wich can be thrown away with myobjects.values() but that returns a pointer to a QList<MyObjects> but that throws an segmentation error when creating qqmllistproperty

p3c0

@Maxim-DC If you don't need MyKey* in QML then you can use QVariantMap with custom objects as values. The custom object will need to be registered first using qmlRegisterType. Also since QVariantMap uses QVariant as 2nd parameter you will need to make that custom object QVariant. To sum up,
For eg.

//register MyClass before using
qmlRegisterType<MyClass>("MyClass",1,0,"MyClass");

MyClass *myclass = new MyClass;
myclass->setText("MyClass Item"); //some method in MyClass

//add it to QVariant
QVariant var = QVariant::fromValue(myclass);

//add it to QVariantMap
QVariantMap map;
map.insert("myclass",var);

//set the map as context property
engine.rootContext()->setContextProperty("mapObj",QVariant::fromValue(map));

//access from QML
import MyClass 1.0
console.log(mapObj["myclass"])
console.log(mapObj["myclass"].text()) //text() is a public slot in MyClass

Also make sure MyClass inherits QObject

Maxim DC

@p3c0 Ok i got it but then i have to specify the key in qml, thats not what i want, i want to make a listmodel of the values of the qmap

p3c0

@Maxim-DC

i want to make a listmodel of the values of the qmap

What do you mean by that ?

Maxim DC

@p3c0 For example the qmap consists of 3 objects, <mykey1*, myobject1*> <mykey2*, myobject2*> <mykey3*, myobject3*> i want to show a list with properties, textinitem1: myobject1.somevar, textinitem2: myobject2.somevar, ....

p3c0

@Maxim-DC I doubt that you can assign a QMap as a model to ListView.

Maxim DC

@p3c0 You can do it with a QList so why not with QMap::values(), because that returns a list

p3c0

@Maxim-DC If you want to reuse your existing QMap then it would be better to create a new class based on QAbstractIItemModel. In there you can re-implement data() to return your data from QMap.