DeviceChange.h

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  DeviceChange.h
 
  Leland Lucius
 
**********************************************************************/
 
#ifndef __AUDACITY_DEVICECHANGE_H__
#define __AUDACITY_DEVICECHANGE_H__
 
#include "Observer.h"
 
enum class DeviceChangeMessage : char { Rescan, Change };
using DeviceChangeMessagePublisher = Observer::Publisher<DeviceChangeMessage>;
 
#if defined(EXPERIMENTAL_DEVICE_CHANGE_HANDLER)
 
#include <memory>
 
#if defined(__WXMSW__) || defined(__WXMAC__) || defined(HAVE_LIBUDEV_H)
#define HAVE_DEVICE_CHANGE
#endif
 
#if defined(HAVE_DEVICE_CHANGE)
 
#include "Observer.h"
 
class DeviceChangeInterface /* not final */
{
public:
   virtual ~DeviceChangeInterface() {};
 
   virtual bool SetHandler(DeviceChangeMessagePublisher *handler) = 0;
   virtual void Enable(bool enable = true) = 0;
};
 
class DeviceChangeHandler
   : public wxEvtHandler // for wxTimerEvent
   , public DeviceChangeMessagePublisher
{
public:
   DeviceChangeHandler();
   virtual ~DeviceChangeHandler();
 
   void Enable(bool enable = true);
 
   virtual void DeviceChangeNotification() = 0;
 
private:
   void OnChange(DeviceChangeMessage);
   void OnTimer(wxTimerEvent & evt);
 
   std::unique_ptr<DeviceChangeInterface> mListener;
   wxTimer mTimer;
 
   Observer::Subscription mSubscription;
 
   DECLARE_EVENT_TABLE()
};
 
#endif
 
#endif
 
#endif