DeviceWatcher.h

#pragma once
#include "DLLInfo.h"
#include <QtCore/QEvent>
#include <QtCore/QObject>
namespace NDEVR
{
    class DeviceWatcherPrivate;
    class NDEVR_WIDGETS_API DeviceWatcher : public QObject
    {
        Q_OBJECT
        Q_DECLARE_PRIVATE(DeviceWatcher)
    public:
        explicit DeviceWatcher(QObject* parent = 0);
        ~DeviceWatcher();

        bool start();
        bool stop();
        bool isRunning() const;

        void appendEventReceiver(QObject* receiver);
        static DeviceWatcher& DefaultWatcher();
    signals:
        void deviceAdded(const QString& dev);
        void deviceChanged(const QString& dev);
        void deviceRemoved(const QString& dev);
 
    protected:
        bool running; 
        DeviceWatcherPrivate* d_ptr; 
    };

    class NDEVR_WIDGETS_API QDeviceChangeEvent : public QEvent
    {
    public:
        enum Action
        {
            Add,    
            Remove, 
            Change  
        };
        //static const Type EventType; //VC link error

        explicit QDeviceChangeEvent(Action action, const QString& device);

        Action action() const { return m_action; }
        QString device() const { return m_device; }
        static Type registeredType()
        {
            static Type EventType = static_cast<Type>(registerEventType());
            return EventType;
        }
 
    private:
        Action m_action; 
        QString m_device; 
    };
}