Add new files...should have been part of r13697

I REALLY need to come up with a better process for moving
between plats as I (apparently) can't remember to do a simple
"svn add" on the final move...grrrr!!!!

src/DeviceChange.h

@@ -0,0 +1,61 @@
+/**********************************************************************
+
+  Audacity: A Digital Audio Editor
+
+  DeviceChange.h
+
+  Leland Lucius
+
+**********************************************************************/
+
+#ifndef __AUDACITY_DEVICECHANGE_H__
+#define __AUDACITY_DEVICECHANGE_H__
+
+#include "Audacity.h"
+#include "Experimental.h"
+
+#if defined(EXPERIMENTAL_DEVICE_CHANGE_HANDLER)
+
+#if defined(__WXMSW__) || defined(__WXMAC__) || defined(HAVE_LIBUDEV_H)
+#define HAVE_DEVICE_CHANGE
+#endif
+
+#if defined(HAVE_DEVICE_CHANGE)
+
+#include <wx/event.h>
+#include <wx/timer.h>
+
+class DeviceChangeInterface
+{
+public:
+   virtual ~DeviceChangeInterface() {};
+
+   virtual bool SetHandler(wxEvtHandler *handler) = 0;
+   virtual void Enable(bool enable = true) = 0;
+};
+
+class DeviceChangeHandler : public wxEvtHandler
+{
+public:
+   DeviceChangeHandler();
+   virtual ~DeviceChangeHandler();
+
+   void Enable(bool enable = true);
+
+   virtual void DeviceChangeNotification() = 0;
+
+private:
+   void OnChange(wxCommandEvent & evt);
+   void OnTimer(wxTimerEvent & evt);
+
+   DeviceChangeInterface *mListener;
+   wxTimer mTimer;
+
+   DECLARE_EVENT_TABLE()
+};
+
+#endif
+
+#endif
+
+#endif