A class encapsulating the global clipboard

src/Clipboard.cpp

@@ -0,0 +1,56 @@
+/**********************************************************************
+
+  Audacity: A Digital Audio Editor
+
+  Clipboard.cpp
+
+*//*******************************************************************/
+
+#include "Clipboard.h"
+#include "Track.h"
+
+wxDEFINE_EVENT( EVT_CLIPBOARD_CHANGE, wxCommandEvent);
+
+Clipboard::Clipboard()
+: mTracks { TrackList::Create() }
+{
+}
+
+Clipboard::~Clipboard() = default;
+
+Clipboard &Clipboard::Get()
+{
+   static Clipboard instance;
+   return instance;
+}
+
+//static
+const TrackList &Clipboard::GetTracks() const
+{
+   return *mTracks;
+}
+
+void Clipboard::Clear()
+{
+   mT0 = 0.0;
+   mT1 = 0.0;
+   mProject = nullptr;
+   mTracks->Clear();
+
+   // Emit an event for listeners
+   AddPendingEvent( wxCommandEvent{ EVT_CLIPBOARD_CHANGE } );
+}
+
+void Clipboard::Assign( TrackList && newContents,
+   double t0, double t1, AudacityProject *pProject )
+{
+   newContents.Swap( *mTracks );
+   newContents.Clear();
+   
+   mT0 = t0;
+   mT1 = t1;
+   mProject = pProject;
+
+   // Emit an event for listeners
+   AddPendingEvent( wxCommandEvent{ EVT_CLIPBOARD_CHANGE } );
+}