Song, SongEditor, BB-Editor, Piano-Roll: correction of play button problems

Initial implementation of corrected play buttons in individual editor
windows.

include/AutomationEditor.h

@@ -72,6 +72,8 @@ public:
 		return( "automationeditor" );
 	}
 
+	void updatePlayPauseIcon();
+
 
 public slots:
 	void update();

include/bb_editor.h

@@ -48,6 +48,8 @@ public:
 
 	void removeBBView( int _bb );
 
+	void updatePlayPauseIcon();
+
 
 public slots:
 	void play();

include/engine.h

@@ -147,6 +147,8 @@ public:
 		return s_controllerRackView;
 	}
 
+	static void updatePlayPauseIcons();
+
 	static float framesPerTick()
 	{
 		return s_framesPerTick;

include/piano_roll.h

@@ -90,6 +90,8 @@ public:
 		return "pianoroll";
 	}
 
+	void updatePlayPauseIcon();
+
 
 protected:
 	virtual void closeEvent( QCloseEvent * _ce );

include/song.h

@@ -54,6 +54,7 @@ class EXPORT song : public trackContainer
 public:
 	enum PlayModes
 	{
+		Mode_None,
 		Mode_PlaySong,
 		Mode_PlayTrack,
 		Mode_PlayBB,
@@ -104,6 +105,11 @@ public:
 		return m_playing && m_exporting == false;
 	}
 
+	inline bool isStopped() const
+	{
+		return m_playing == false && m_paused == false;
+	}
+
 	bool isFreezingPattern() const;
 
 	inline bool isExporting() const
@@ -196,15 +202,14 @@ public:
 
 
 public slots:
-	void play();
+	void playSong();
 	void record();
 	void playAndRecord();
-	void stop();
 	void playTrack( track * _trackToPlay );
 	void playBB();
 	void playPattern( pattern * _patternToPlay, bool _loop = true );
-	void pause();
-	void resumeFromPause();
+	void togglePause();
+	void stop();
 
 	void importProject();
 	void exportProject();
@@ -231,7 +236,7 @@ private slots:
 
 	void masterVolumeChanged();
 
-	void doActions();
+	void savePos();
 
 	void updateFramesPerTick();
 
@@ -296,19 +301,6 @@ private:
 	bool m_loopPattern;
 
 
-	enum Actions
-	{
-		ActionStop,
-		ActionPlaySong,
-		ActionPlayTrack,
-		ActionPlayBB,
-		ActionPlayPattern,
-		ActionPause,
-		ActionResumeFromPause
-	} ;
-	QVector<Actions> m_actions;
-
-
 	friend class engine;
 	friend class songEditor;
 	friend class mainWindow;

include/song_editor.h

@@ -63,6 +63,8 @@ public:
 public slots:
 	void scrolled( int _new_pos );
 
+	void updatePlayPauseIcon();
+
 
 private slots:
 	void setHighQuality( bool );