How to create Q_PROPERTYies that can handle javascript's array operator?

[kitfox]

I'm trying to figure out how to evaluate expressions using the QJSEngine. I'm interested in just evaluating Javascript - not QML - but I know they're related in Qt, so I thought I'd post this here.

Anyhow, I know in Javascript the [] operator is used like a lookup into a hash map. So myObject[3] and myObject["horse"] will respectively return the named child object mapped to those keys.

I'd like to do something similar with the Scene object I'm designing that I plan to expose to the Javascript engine:

class Node : public QObject
{
    Q_OBJECT
    QString m_name;

public:    
    Node(QWidget *parent = nullptr);    
    const QString& name() { return m_name; }
}

class Scene : public QObject
{
    Q_OBJECT
    HashMap<int, Node*> m_nodeIdMap;

public:    
    Scene(QWidget *parent = nullptr);
    Node* node(int id) { return m_nodeIdMap[id]; }
    
public slots:
    void setNode(int id, Node* node) { m_nodeIdMap[id] = node; }
};

If I create an instance of Scene and expose it to my Javascript engine with the name 'scene', what would I need to do to have it be able to respond to javascript code like:

print scene.node[3].name;

[dheerendra]

Did you check whether qqmllistproperty can help ?

[kitfox]

I did, but it seems like it is specific to lists rather than maps. I'd like to be able to handle strings as map values too.

edit:
I just found QQmlPropertyMap. This may be what I'm looking for. However, there is no example of how to use it as a property. It also seems to be a full hash map in and of itself rather than a wrapper around the hash I'm currently using.