Q_INVOKABLE and namespaces example

bar.cpp

#include "bar.h"

namespace Foo {

Bar::Bar(QObject *parent) : QObject(parent)
{
}

Bar *Bar::run()
{
    return this;
}

}

bar.h

#pragma once

#include <QObject>

namespace Foo {
class Bar : public QObject
{
    Q_OBJECT
public:
    explicit Bar(QObject *parent = 0);
//    Q_INVOKABLE Foo::Bar *run();
    Q_INVOKABLE Bar *run();
};
}

invokableNamespace.pro

TEMPLATE = app

QT += qml quick

SOURCES += main.cpp bar.cpp
HEADERS += bar.h

main.cpp

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QtQml>

#include "bar.h"

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    qmlRegisterType<Foo::Bar>("MyModules", 1, 0, "QMLFooBar");

    QByteArray qml = QString(
                "import QtQuick 2.3                               \n"
                "import QtQuick.Controls 1.2                      \n"
                "import MyModules 1.0                             \n"
                "                                                 \n"
                "ApplicationWindow {                              \n"
                "    visible: true                                \n"
                "    width: 640                                   \n"
                "    height: 480                                  \n"
                "                                                 \n"
                "    QMLFooBar {                                  \n"
                "        id: fb                                   \n"
                "    }                                            \n"
                "                                                 \n"
                "    Button {                                     \n"
                "        text: 'test!'                            \n"
                "        anchors.centerIn: parent                 \n"
                "        onClicked: fb.run() && console.log('ok') \n"
                "    }                                            \n"
                "}                                                \n"
                ).toUtf8();


    QQmlApplicationEngine engine;
    engine.loadData(qml);

    return app.exec();
}