Fixes createTCO method on some classes (LMMS#5699)

* Fixes createTCO method on some classes

	Classes that inherit from "Track", also inherit the createTCO method. That method takes a MidiTime position as an argument, but except on the class SampleTrack that argument was ignored. That lead to unnecessary calls to TCO->movePosition after creating a TCO in many parts of the codebase (making the argument completely redundant) and even to a bug on the BBEditor, caused by a call to createTCO that expected the position to be set on the constructor (see issue LMMS#5673).

	That PR adds code to move the TCO to the appropriate position inside the constructor of the classes that didn't have it, fixes the code style on the SampleTrack createTCO method and removes the now unneeded calls to movePosition from source files on src/ and plugins/. On Track::loadSettings there was a call to saveJournallingState(false) followed immediately by restoreJournallingState() which was deleted because it's redundant (probably a left over from copying the code from pasteSelection?).

* Fix code style issues

	Fixes code style issues on some files (except for ones where the current statements already had a different code style. In those the used code style was kept for consistency).

* Fixes more code style issues

* Fixes code style issues on the parameter name

	Fixes code style issue on the parameter name of createTCO, where _pos was supposed to be just pos. The existing code had the old style and I ended up replicating it on the other methods.

* Code style fixes

	Fixes code style in the changed lines.

* Fixes bug with dragging to negative positions

	There was a bug (already present before this PR) where dragging
a selection before MidiTime 0 would result in some TCOs being placed on
negative positions. This PR fixes this bug by applying the following
changes:

	1) TrackContentObject::movePosition now moves the TCO to
positions equal or above 0 only.
	2) Because of the previous change, I removed the line that
calculated the max value between 0 and the new position on
TrackContentObjectView::mouseMoveEvent when dragging a single TCO (and
added a line updating the value to the real new position of the TCO so
the label displays the position correctly).
	3) Unrelated to this bug, but removed an unnecessary call to
TrackContentWidget::changePosition on the left resize of sample TCOs
because it will already be called when movePosition triggers the
positionChanged signal.
	4) Added some logic to the TrackContentWidget::pasteSelection
method to find the left most TCO being pasted and make sure that the
offset is corrected so it doesn't end up on a negative position (similar
to the logic for the MoveSelection action).
	5) Removed another line that calculated the max between 0 and
the new position on Track::removeBar since it's now safe to call
movePosition with negative values.

* Uses std::max instead of a conditional statement

	As suggested by Spekular, we use std::max instead of a
conditional statement to correct the value of offset if it positions a
TCO on a negative position.

include/AutomationTrack.h

@@ -46,7 +46,7 @@ class AutomationTrack : public Track
 	}
 
 	TrackView * createView( TrackContainerView* ) override;
-	TrackContentObject * createTCO( const MidiTime & _pos ) override;
+	TrackContentObject* createTCO(const MidiTime & pos) override;
 
 	virtual void saveTrackSpecificSettings( QDomDocument & _doc,
 							QDomElement & _parent ) override;

include/BBTrack.h

@@ -106,7 +106,7 @@ class LMMS_EXPORT BBTrack : public Track
 	virtual bool play( const MidiTime & _start, const fpp_t _frames,
 						const f_cnt_t _frame_base, int _tco_num = -1 ) override;
 	TrackView * createView( TrackContainerView* tcv ) override;
-	TrackContentObject * createTCO( const MidiTime & _pos ) override;
+	TrackContentObject* createTCO(const MidiTime & pos) override;
 
 	virtual void saveTrackSpecificSettings( QDomDocument & _doc,
 							QDomElement & _parent ) override;

include/InstrumentTrack.h

@@ -136,7 +136,7 @@ class LMMS_EXPORT InstrumentTrack : public Track, public MidiEventProcessor
 	TrackView * createView( TrackContainerView* tcv ) override;
 
 	// create new track-content-object = pattern
-	TrackContentObject * createTCO( const MidiTime & _pos ) override;
+	TrackContentObject* createTCO(const MidiTime & pos) override;
 
 
 	// called by track

include/SampleTrack.h

@@ -140,7 +140,7 @@ class SampleTrack : public Track
 	virtual bool play( const MidiTime & _start, const fpp_t _frames,
 						const f_cnt_t _frame_base, int _tco_num = -1 ) override;
 	TrackView * createView( TrackContainerView* tcv ) override;
-	TrackContentObject * createTCO( const MidiTime & _pos ) override;
+	TrackContentObject* createTCO(const MidiTime & pos) override;
 
 
 	virtual void saveTrackSpecificSettings( QDomDocument & _doc,

plugins/HydrogenImport/HydrogenImport.cpp

@@ -314,10 +314,8 @@ bool HydrogenImport::readSong()
 
 			int i = pattern_id[patId]+song_num_tracks;
 			Track *t = ( BBTrack * ) s->tracks().at( i );
- 			TrackContentObject *tco = t->createTCO( pos );      
-			tco->movePosition( pos );
+			t->createTCO(pos);
 
-
 			if ( pattern_length[patId] > best_length ) 
 			{
 				best_length = pattern_length[patId];

plugins/MidiImport/MidiImport.cpp

@@ -193,8 +193,7 @@ class smfMidiCC
 		{
 			MidiTime pPos = MidiTime( time.getBar(), 0 );
 			ap = dynamic_cast<AutomationPattern*>(
-				at->createTCO(0) );
-			ap->movePosition( pPos );
+				at->createTCO(pPos));
 			ap->addObject( objModel );
 		}
 
@@ -287,8 +286,7 @@ class smfMidiChannel
 			if (!newPattern || n->pos() > lastEnd + DefaultTicksPerBar)
 			{
 				MidiTime pPos = MidiTime(n->pos().getBar(), 0);
-				newPattern = dynamic_cast<Pattern*>(it->createTCO(0));
-				newPattern->movePosition(pPos);
+				newPattern = dynamic_cast<Pattern*>(it->createTCO(pPos));
 			}
 			lastEnd = n->pos() + n->length();
 

src/core/Track.cpp

@@ -151,10 +151,11 @@ TrackContentObject::~TrackContentObject()
  */
 void TrackContentObject::movePosition( const MidiTime & pos )
 {
-	if( m_startPosition != pos )
+	MidiTime newPos = qMax(0, pos.getTicks());
+	if (m_startPosition != newPos)
 	{
 		Engine::mixer()->requestChangeInModel();
-		m_startPosition = pos;
+		m_startPosition = newPos;
 		Engine::mixer()->doneChangeInModel();
 		Engine::getSong()->updateLength();
 		emit positionChanged();
@@ -955,9 +956,8 @@ void TrackContentObjectView::mouseMoveEvent( QMouseEvent * me )
 	{
 		MidiTime newPos = draggedTCOPos( me );
 
-		// Don't go left of bar zero
-		newPos = max( 0, newPos.getTicks() );
-		m_tco->movePosition( newPos );
+		m_tco->movePosition(newPos);
+		newPos = m_tco->startPosition(); // Get the real position the TCO was dragged to for the label
 		m_trackView->getTrackContentWidget()->changePosition();
 		s_textFloat->setText( QString( "%1:%2" ).
 				arg( newPos.getBar() + 1 ).
@@ -1073,7 +1073,6 @@ void TrackContentObjectView::mouseMoveEvent( QMouseEvent * me )
 				if( m_tco->length() + ( oldPos - t ) >= 1 )
 				{
 					m_tco->movePosition( t );
-					m_trackView->getTrackContentWidget()->changePosition();
 					m_tco->changeLength( m_tco->length() + ( oldPos - t ) );
 					sTco->setStartTimeOffset( sTco->startTimeOffset() + ( oldPos - t ) );
 				}
@@ -1896,6 +1895,20 @@ bool TrackContentWidget::pasteSelection( MidiTime tcoPos, const QMimeData * md,
 	// The offset is quantized (rather than the positions) to preserve fine adjustments
 	offset = offset.quantize(snapSize);
 
+	// Get the leftmost TCO and fix the offset if it reaches below bar 0
+	MidiTime leftmostPos = grabbedTCOPos;
+	for(int i = 0; i < tcoNodes.length(); ++i)
+	{
+		QDomElement outerTCOElement = tcoNodes.item(i).toElement();
+		QDomElement tcoElement = outerTCOElement.firstChildElement();
+
+		MidiTime pos = tcoElement.attributeNode("pos").value().toInt();
+
+		if(pos < leftmostPos) { leftmostPos = pos; }
+	}
+	// Fix offset if it sets the left most TCO to a negative position
+	offset = std::max(offset.getTicks(), -leftmostPos.getTicks());
+
 	for( int i = 0; i<tcoNodes.length(); i++ )
 	{
 		QDomElement outerTCOElement = tcoNodes.item( i ).toElement();
@@ -1913,7 +1926,7 @@ bool TrackContentWidget::pasteSelection( MidiTime tcoPos, const QMimeData * md,
 
 		TrackContentObject * tco = t->createTCO( pos );
 		tco->restoreState( tcoElement );
-		tco->movePosition( pos );
+		tco->movePosition(pos); // Because we restored the state, we need to move the TCO again.
 		if( wasSelection )
 		{
 			tco->selectViewOnCreate( true );
@@ -1967,11 +1980,7 @@ void TrackContentWidget::mousePressEvent( QMouseEvent * me )
 		getTrack()->addJournalCheckPoint();
 		const MidiTime pos = getPosition( me->x() ).getBar() *
 						MidiTime::ticksPerBar();
-		TrackContentObject * tco = getTrack()->createTCO( pos );
-
-		tco->saveJournallingState( false );
-		tco->movePosition( pos );
-		tco->restoreJournallingState();
+		getTrack()->createTCO(pos);
 	}
 }
 
@@ -2697,8 +2706,6 @@ void Track::loadSettings( const QDomElement & element )
 				TrackContentObject * tco = createTCO(
 								MidiTime( 0 ) );
 				tco->restoreState( node.toElement() );
-				saveJournallingState( false );
-				restoreJournallingState();
 			}
 		}
 		node = node.nextSibling();
@@ -2886,7 +2893,6 @@ void Track::createTCOsForBB( int bb )
 	{
 		MidiTime position = MidiTime( numOfTCOs(), 0 );
 		TrackContentObject * tco = createTCO( position );
-		tco->movePosition( position );
 		tco->changeLength( MidiTime( 1, 0 ) );
 	}
 }
@@ -2932,8 +2938,7 @@ void Track::removeBar( const MidiTime & pos )
 	{
 		if( ( *it )->startPosition() >= pos )
 		{
-			( *it )->movePosition( qMax( ( *it )->startPosition() -
-						MidiTime::ticksPerBar(), 0 ) );
+			(*it)->movePosition((*it)->startPosition() - MidiTime::ticksPerBar());
 		}
 	}
 }

src/tracks/AutomationTrack.cpp

@@ -57,9 +57,11 @@ TrackView * AutomationTrack::createView( TrackContainerView* tcv )
 
 
 
-TrackContentObject * AutomationTrack::createTCO( const MidiTime & )
+TrackContentObject* AutomationTrack::createTCO(const MidiTime & pos)
 {
-	return new AutomationPattern( this );
+	AutomationPattern* p = new AutomationPattern(this);
+	p->movePosition(pos);
+	return p;
 }
 
 
@@ -133,7 +135,6 @@ void AutomationTrackView::dropEvent( QDropEvent * _de )
 			TrackContentObject * tco = getTrack()->createTCO( pos );
 			AutomationPattern * pat = dynamic_cast<AutomationPattern *>( tco );
 			pat->addObject( mod );
-			pat->movePosition( pos );
 		}
 	}
 

src/tracks/BBTrack.cpp

@@ -382,9 +382,10 @@ TrackView * BBTrack::createView( TrackContainerView* tcv )
 
 
 
-TrackContentObject * BBTrack::createTCO( const MidiTime & _pos )
+TrackContentObject* BBTrack::createTCO(const MidiTime & pos)
 {
-	BBTCO * bbtco = new BBTCO( this );
+	BBTCO* bbtco = new BBTCO(this);
+	bbtco->movePosition(pos);
 	return bbtco;
 }
 

src/tracks/InstrumentTrack.cpp

@@ -713,9 +713,11 @@ bool InstrumentTrack::play( const MidiTime & _start, const fpp_t _frames,
 
 
 
-TrackContentObject * InstrumentTrack::createTCO( const MidiTime & )
+TrackContentObject* InstrumentTrack::createTCO(const MidiTime & pos)
 {
-	return new Pattern( this );
+	Pattern* p = new Pattern(this);
+	p->movePosition(pos);
+	return p;
 }