En-/disable loop points via MidiControlListener

MidiControlListener's toggleLoop action makes the song object emit a
loopPointsChanged signal, which timeLine connects to and enables or
disables the loop points accordingly.

Signed-off-by: Tobias Doerffel <tobias.doerffel@gmail.com>

include/midi_control_listener.h

@@ -44,9 +44,12 @@ public:
 		ActionNone = 0,
 		ActionControl,
 		ActionPlay,
-		ActionStop
+		ActionStop,
+		ActionToggleLoop,
+		ActionJumpToLoopStart,
+		ActionJumpToLoopEnd
 	} EventAction;
-	static const int numActions = 4;
+	static const int numActions = 7;
 	
 	typedef QMap<int, EventAction> ActionMap;
 	

include/song.h

@@ -192,7 +192,11 @@ public:
 		return m_timeSigModel;
 	}
 
-
+	inline void toggleLoopPoints( int _mode )
+	{
+		emit loopPointsChanged( _mode );
+	}
+	
 public slots:
 	void play( void );
 	void record( void );
@@ -316,7 +320,7 @@ signals:
 	void tempoChanged( bpm_t _new_bpm );
 	void timeSignatureChanged( int _old_ticks_per_tact,
 							int _ticks_per_tact );
-
+	void loopPointsChanged( int _mode );
 } ;