C++ Reactive Programming

Event type specific observables

The code to subscribe to the rxcpp::observable of mouse events is as follows:

• Mouse move
• Mouse button press
• Mouse button double-click

The program is as follows:

    // Display the mouse move message and the mouse coordinates 
    rxevt::from(label_mouseArea, QEvent::MouseMove) 
            .subscribe([&label_coordinates](const QEvent* e){ 
        auto me = static_cast<const QMouseEvent*>(e); 
        label_coordinates->setText(QString("Mouse Moving : X = %1, Y = %2") 
                                   .arg(me->x()) 
                                   .arg(me->y())); 
    });

The rxevt::from() function returns the rxcpp::observable of the events from label_mouseArea, based on the QEvent::Type we are passing as the argument. In this code, we are subscribing to an Observable of events in label_mouseArea, which are of the  ...