Get rid of m_presetMode and isPresetMode()

Get rid of the protected member `m_presetMode` and its corresponding
method `isPresetMode()`.

This is accomplished by introducing two new methods `saveTrack` and
`loadTrack`. These methods have a similar interface to `saveSettings`
and `loadSettings` but they additionally contain a boolean which
indicates if a preset is saved/loaded or a whole track. Both new
methods contain the previous code of `saveSettings` and `loadSettings`.
The latter two now only delegate to the new methods assuming that the
full track is to be stored/loaded if called via the overridden methods
`saveSettings` and `loadSettings`.

Adjust `saveTrackSpecificSettings` so that it also passes information
of whether a preset or a whole track is stored. This leads to changes
in the interfaces of `AutomationTrack`, `InstrumentTrack`,
`PatternTrack` and `SampleTrack`. Only the implementation of
`InstrumentTrack` uses the new information though.

Remove the `BoolGuard` class and adjust the implementation of
`InstrumentTrack::savePreset` and `InstrumentTrack::loadPreset` to
simply delegate to the `saveTrack` and `loadTrack` methods with the
correct parameters. The methods `savePreset` and `loadPreset` are kept
because they make the code more readable.

Implementation notes
---------------------
It could be considered to move `savePreset` and `loadPreset` into
`Track`.

The method `loadTrackSpecificSettings` was not adjusted with an
additional boolean because for now no implementation needs to
explicitly know if a preset or a track is restored. It could be
considered to make the interfaces symmetrical though.

include/AutomationTrack.h

@@ -50,8 +50,7 @@ class AutomationTrack : public Track
 	gui::TrackView * createView( gui::TrackContainerView* ) override;
 	Clip* createClip(const TimePos & pos) override;
 
-	void saveTrackSpecificSettings( QDomDocument & _doc,
-							QDomElement & _parent ) override;
+	void saveTrackSpecificSettings(QDomDocument& doc, QDomElement& parent, bool presetMode) override;
 	void loadTrackSpecificSettings( const QDomElement & _this ) override;
 
 private:

include/InstrumentTrack.h

@@ -133,8 +133,7 @@ class LMMS_EXPORT InstrumentTrack : public Track, public MidiEventProcessor
 
 
 	// called by track
-	void saveTrackSpecificSettings( QDomDocument & _doc,
-							QDomElement & _parent ) override;
+	void saveTrackSpecificSettings(QDomDocument& doc, QDomElement& parent, bool presetMode) override;
 	void loadTrackSpecificSettings( const QDomElement & _this ) override;
 
 	void savePreset(QDomDocument & doc, QDomElement & element);

include/PatternTrack.h

@@ -57,8 +57,7 @@ class LMMS_EXPORT PatternTrack : public Track
 	gui::TrackView * createView( gui::TrackContainerView* tcv ) override;
 	Clip* createClip(const TimePos & pos) override;
 
-	void saveTrackSpecificSettings( QDomDocument & _doc,
-							QDomElement & _parent ) override;
+	void saveTrackSpecificSettings(QDomDocument& doc, QDomElement& parent, bool presetMode) override;
 	void loadTrackSpecificSettings( const QDomElement & _this ) override;
 
 	static PatternTrack* findPatternTrack(int pattern_num);

include/SampleTrack.h

@@ -54,8 +54,7 @@ class SampleTrack : public Track
 	Clip* createClip(const TimePos & pos) override;
 
 
-	void saveTrackSpecificSettings( QDomDocument & _doc,
-							QDomElement & _parent ) override;
+	void saveTrackSpecificSettings(QDomDocument& doc, QDomElement& parent, bool presetMode) override;
 	void loadTrackSpecificSettings( const QDomElement & _this ) override;
 
 	inline IntModel * mixerChannelModel()

include/Track.h

@@ -107,11 +107,12 @@ class LMMS_EXPORT Track : public Model, public JournallingObject
 	virtual gui::TrackView * createView( gui::TrackContainerView * view ) = 0;
 	virtual Clip * createClip( const TimePos & pos ) = 0;
 
-	virtual void saveTrackSpecificSettings( QDomDocument & doc,
-						QDomElement & parent ) = 0;
+	virtual void saveTrackSpecificSettings(QDomDocument& doc, QDomElement& parent, bool presetMode) = 0;
 	virtual void loadTrackSpecificSettings( const QDomElement & element ) = 0;
 
 
+	void saveTrack(QDomDocument& doc, QDomElement& element, bool presetMode);
+	void loadTrack(const QDomElement& element, bool presetMode);
 	void saveSettings( QDomDocument & doc, QDomElement & element ) override;
 	void loadSettings( const QDomElement & element ) override;
 
@@ -204,12 +205,6 @@ public slots:
 
 	void toggleSolo();
 
-protected:
-	bool isPresetMode() const { return m_presetMode; }
-
-protected:
-	bool m_presetMode = false;
-
 private:
 	TrackContainer* m_trackContainer;
 	Type m_type;

src/core/Track.cpp

@@ -173,10 +173,6 @@ Track* Track::clone()
 }
 
 
-
-
-
-
 /*! \brief Save this track's settings to file
  *
  *  We save the track type and its muted state and solo state, then append the track-
@@ -185,12 +181,13 @@ Track* Track::clone()
  *
  *  \param doc The QDomDocument to use to save
  *  \param element The The QDomElement to save into
+ *  \param presetMode Describes whether to save the track as a preset or not.
  *  \todo Does this accurately describe the parameters?  I think not!?
  *  \todo Save the track height
  */
-void Track::saveSettings( QDomDocument & doc, QDomElement & element )
+void Track::saveTrack(QDomDocument& doc, QDomElement& element, bool presetMode)
 {
-	if (!isPresetMode())
+	if (!presetMode)
 	{
 		element.setTagName( "track" );
 	}
@@ -214,11 +211,10 @@ void Track::saveSettings( QDomDocument & doc, QDomElement & element )
 	QDomElement tsDe = doc.createElement( nodeName() );
 	// let actual track (InstrumentTrack, PatternTrack, SampleTrack etc.) save its settings
 	element.appendChild( tsDe );
-	saveTrackSpecificSettings( doc, tsDe );
+	saveTrackSpecificSettings(doc, tsDe, presetMode);
 
-	if (isPresetMode())
+	if (presetMode)
 	{
-		// No need to unset preset mode here as this will done by the guard in InstrumentTrack::savePreset
 		return;
 	}
 
@@ -229,9 +225,6 @@ void Track::saveSettings( QDomDocument & doc, QDomElement & element )
 	}
 }
 
-
-
-
 /*! \brief Load the settings from a file
  *
  *  We load the track's type and muted state and solo state, then clear out our
@@ -242,9 +235,10 @@ void Track::saveSettings( QDomDocument & doc, QDomElement & element )
  *  one at a time.
  *
  *  \param element the QDomElement to load track settings from
+ *  \param presetMode Indicates if a preset or a full track is loaded
  *  \todo Load the track height.
  */
-void Track::loadSettings( const QDomElement & element )
+void Track::loadTrack(const QDomElement& element, bool presetMode)
 {
 	if( static_cast<Type>(element.attribute( "type" ).toInt()) != type() )
 	{
@@ -266,7 +260,7 @@ void Track::loadSettings( const QDomElement & element )
 		setColor(QColor{element.attribute("color")});
 	}
 
-	if (isPresetMode())
+	if (presetMode)
 	{
 		QDomNode node = element.firstChild();
 		while( !node.isNull() )
@@ -279,8 +273,6 @@ void Track::loadSettings( const QDomElement & element )
 			node = node.nextSibling();
 		}
 
-		// No need to unset preset mode here as this will done by the guard in InstrumentTrack::loadPreset
-
 		return;
 	}
 
@@ -317,6 +309,16 @@ void Track::loadSettings( const QDomElement & element )
 	}
 }
 
+void Track::saveSettings(QDomDocument& doc, QDomElement& element)
+{
+	saveTrack(doc, element, false);
+}
+
+void Track::loadSettings(const QDomElement& element)
+{
+	loadTrack(element, false);
+}
+
 
 
 

src/tracks/AutomationTrack.cpp

@@ -66,8 +66,7 @@ Clip* AutomationTrack::createClip(const TimePos & pos)
 
 
 
-void AutomationTrack::saveTrackSpecificSettings( QDomDocument & _doc,
-							QDomElement & _this )
+void AutomationTrack::saveTrackSpecificSettings(QDomDocument& doc, QDomElement& _this, bool presetMode)
 {
 }
 

src/tracks/InstrumentTrack.cpp

@@ -821,7 +821,7 @@ gui::TrackView* InstrumentTrack::createView( gui::TrackContainerView* tcv )
 
 
 
-void InstrumentTrack::saveTrackSpecificSettings( QDomDocument& doc, QDomElement & thisElement )
+void InstrumentTrack::saveTrackSpecificSettings(QDomDocument& doc, QDomElement& thisElement, bool presetMode)
 {
 	m_volumeModel.saveSettings( doc, thisElement, "vol" );
 	m_panningModel.saveSettings( doc, thisElement, "pan" );
@@ -869,7 +869,7 @@ void InstrumentTrack::saveTrackSpecificSettings( QDomDocument& doc, QDomElement
 		autoAssignMidiDevice(false);
 
 		// Only save the MIDI port information if we are not saving a preset.
-		if (!isPresetMode())
+		if (!presetMode)
 		{
 			m_midiPort.saveState(doc, thisElement);
 		}
@@ -994,46 +994,14 @@ void InstrumentTrack::loadTrackSpecificSettings( const QDomElement & thisElement
 	unlock();
 }
 
-/**
- * @brief RAII "guard" used to safely change and reset booleans even during exceptions
- * 
- * Needed to safely reset m_presetMode in savePreset and loadPreset. For this reason
- * only defined locally because at least the pattern used by these methods should not
- * spread outside.
- */
-class BoolGuard
-{
-public:
-	BoolGuard(bool& member, bool temporaryValue) :
-	m_member(member),
-	m_oldValue(member)
-	{
-		m_member = temporaryValue;
-	}
-
-	~BoolGuard()
-	{
-		m_member = m_oldValue;
-	}
-
-	BoolGuard(const BoolGuard&) = delete;
-    BoolGuard& operator=(const BoolGuard&) = delete;
-
-private:
-	bool & m_member;
-	bool const m_oldValue;
-};
-
 void InstrumentTrack::savePreset(QDomDocument & doc, QDomElement & element)
 {
-	BoolGuard guard(m_presetMode, true);
-	saveSettings(doc, element);
+	saveTrack(doc, element, true);
 }
 
 void InstrumentTrack::loadPreset(const QDomElement & element)
 {
-	BoolGuard guard(m_presetMode, true);
-	loadSettings(element);
+	loadTrack(element, true);
 }
 
 

src/tracks/PatternTrack.cpp

@@ -154,7 +154,7 @@ Clip* PatternTrack::createClip(const TimePos & pos)
 
 
 
-void PatternTrack::saveTrackSpecificSettings(QDomDocument& doc, QDomElement& _this)
+void PatternTrack::saveTrackSpecificSettings(QDomDocument& doc, QDomElement& _this, bool presetMode)
 {
 //	_this.setAttribute( "icon", m_trackLabel->pixmapFile() );
 /*	_this.setAttribute( "current", s_infoMap[this] ==

src/tracks/SampleTrack.cpp

@@ -188,8 +188,7 @@ Clip * SampleTrack::createClip(const TimePos & pos)
 
 
 
-void SampleTrack::saveTrackSpecificSettings( QDomDocument & _doc,
-							QDomElement & _this )
+void SampleTrack::saveTrackSpecificSettings(QDomDocument& _doc, QDomElement& _this, bool presetMode)
 {
 	m_audioPort.effects()->saveState( _doc, _this );
 #if 0