如何使用QDeclarative将QMap暴露给QML

Question

如何将QMap从C++暴露给QML？使用QList我可以使用QDeclarativeListProperty.

Answer 1

您可以将其转换或更改为QVariantMap.在QML中,您可以将QVariantMap实例用作普通的Javascript对象.

class MyClass : public QObject {
Q_OBJECT
public:
    Q_INVOKABLE QVariantMap getIntMap() {
        QVariantMap rval;
        foreach (QString key, m_intMap.keys()) {
            // int has an implicit conversion to QVariant
            rval[key] = m_intMap[key]; 
        }
        return rval;
    }

    Q_INVOKABLE QVariantMap getObjMap() {
        QVariantMap rval;
        foreach (QString key, m_objMap.keys()) {
            // TODO: make sure all QObject subclasses are exported to QML
            rval[key] = QVariant::fromValue<QObject*>(m_objMap[key]); 
        }
        return rval;
    }

private:
    QMap<QString, int> m_intMap;
    QMap<QString, QObject*> m_objMap;
}