Keep master bus color on FX Mixer when switching project

Fixes #6398

include/Mixer.h

@@ -31,7 +31,7 @@
 #include "ThreadableJob.h"
 
 #include <atomic>
-
+#include <optional>
 #include <QColor>
 
 namespace lmms
@@ -76,18 +76,13 @@ class MixerChannel : public ThreadableJob
 		bool requiresProcessing() const override { return true; }
 		void unmuteForSolo();
 
-
 		void setColor (QColor newColor)
 		{
 			m_color = newColor;
-			m_hasColor = true;
 		}
 
-		// TODO C++17 and above: use std::optional instead
-		QColor m_color;
-		bool m_hasColor;
+		std::optional<QColor> m_color;
 
-	
 		std::atomic_int m_dependenciesMet;
 		void incrementDeps();
 		void processed();

include/Track.h

@@ -32,6 +32,7 @@
 #include "AutomatableModel.h"
 #include "JournallingObject.h"
 #include "lmms_basics.h"
+#include <optional>
 
 
 namespace lmms
@@ -191,11 +192,11 @@ public:
 	
 	QColor color()
 	{
-		return m_color;
+		return m_color.value();
 	}
 	bool useColor()
 	{
-		return m_hasColor;
+		return m_color.has_value();
 	}
 
 	bool isMutedBeforeSolo() const
@@ -241,8 +242,7 @@ private:
 
 	QMutex m_processingLock;
 	
-	QColor m_color;
-	bool m_hasColor;
+	std::optional<QColor> m_color;
 
 	friend class gui::TrackView;
 

src/core/Mixer.cpp

@@ -72,7 +72,6 @@ MixerChannel::MixerChannel( int idx, Model * _parent ) :
 	m_lock(),
 	m_channelIndex( idx ),
 	m_queued( false ),
-	m_hasColor( false ),
 	m_dependenciesMet(0)
 {
 	BufferManager::clear( m_buffer, Engine::audioEngine()->framesPerPeriod() );
@@ -722,6 +721,7 @@ void Mixer::clearChannel(mix_ch_t index)
 	ch->m_volumeModel.setDisplayName( ch->m_name + ">" + tr( "Volume" ) );
 	ch->m_muteModel.setDisplayName( ch->m_name + ">" + tr( "Mute" ) );
 	ch->m_soloModel.setDisplayName( ch->m_name + ">" + tr( "Solo" ) );
+	ch->m_color = std::nullopt;
 
 	// send only to master
 	if( index > 0)
@@ -759,7 +759,7 @@ void Mixer::saveSettings( QDomDocument & _doc, QDomElement & _this )
 		ch->m_soloModel.saveSettings( _doc, mixch, "soloed" );
 		mixch.setAttribute( "num", i );
 		mixch.setAttribute( "name", ch->m_name );
-		if( ch->m_hasColor ) mixch.setAttribute( "color", ch->m_color.name() );
+		if (ch->m_color.has_value()) { mixch.setAttribute("color", ch->m_color->name()); }
 
 		// add the channel sends
 		for (const auto& send : ch->m_sends)
@@ -807,8 +807,7 @@ void Mixer::loadSettings( const QDomElement & _this )
 		m_mixerChannels[num]->m_name = mixch.attribute( "name" );
 		if( mixch.hasAttribute( "color" ) )
 		{
-			m_mixerChannels[num]->m_hasColor = true;
-			m_mixerChannels[num]->m_color.setNamedColor( mixch.attribute( "color" ) );
+			m_mixerChannels[num]->m_color = QColor(mixch.attribute("color"));
 		}
 
 		m_mixerChannels[num]->m_fxChain.restoreState( mixch.firstChildElement(

src/core/Track.cpp

@@ -65,9 +65,8 @@ Track::Track( Type type, TrackContainer * tc ) :
 	m_soloModel( false, this, tr( "Solo" ) ), /*!< For controlling track soloing */
 	m_simpleSerializingMode( false ),
 	m_clips(),        /*!< The clips (segments) */
-	m_color( 0, 0, 0 ),
-	m_hasColor( false )
-{
+	m_color(std::nullopt)
+{	
 	m_trackContainer->addTrack( this );
 	m_height = -1;
 }
@@ -209,9 +208,9 @@ void Track::saveSettings( QDomDocument & doc, QDomElement & element )
 		element.setAttribute( "trackheight", m_height );
 	}
 	
-	if( m_hasColor )
+	if (m_color.has_value())
 	{
-		element.setAttribute( "color", m_color.name() );
+		element.setAttribute("color", m_color->name());
 	}
 	
 	QDomElement tsDe = doc.createElement( nodeName() );
@@ -636,14 +635,13 @@ void Track::toggleSolo()
 
 void Track::setColor(const QColor& c)
 {
-	m_hasColor = true;
 	m_color = c;
 	emit colorChanged();
 }
 
 void Track::resetColor()
 {
-	m_hasColor = false;
+	m_color = std::nullopt;
 	emit colorChanged();
 }
 
@@ -653,4 +651,4 @@ BoolModel *Track::getMutedModel()
 	return &m_mutedModel;
 }
 
-} // namespace lmms
+} // namespace lmms

src/gui/MixerLine.cpp

@@ -174,9 +174,9 @@ void MixerLine::drawMixerLine( QPainter* p, const MixerLine *mixerLine, bool isA
 	int width = mixerLine->rect().width();
 	int height = mixerLine->rect().height();
 	
-	if( channel->m_hasColor && !muted )
+	if (channel->m_color.has_value() && !muted)
 	{
-		p->fillRect( mixerLine->rect(), channel->m_color.darker( isActive ? 120 : 150 ) );
+		p->fillRect(mixerLine->rect(), channel->m_color->darker(isActive ? 120 : 150));
 	}
 	else
 	{
@@ -435,7 +435,7 @@ void MixerLine::setStrokeInnerInactive( const QColor & c )
 void MixerLine::selectColor()
 {
 	auto channel = Engine::mixer()->mixerChannel( m_channelIndex );
-	auto new_color = ColorChooser(this).withPalette(ColorChooser::Palette::Mixer)->getColor(channel->m_color);
+	auto new_color = ColorChooser(this).withPalette(ColorChooser::Palette::Mixer)->getColor(channel->m_color.value_or(backgroundActive().color()));
 	if(!new_color.isValid()) { return; }
 	channel->setColor (new_color);
 	Engine::getSong()->setModified();
@@ -446,7 +446,7 @@ void MixerLine::selectColor()
 // Disable the usage of color on this mixer line
 void MixerLine::resetColor()
 {
-	Engine::mixer()->mixerChannel( m_channelIndex )->m_hasColor = false;
+	Engine::mixer()->mixerChannel(m_channelIndex)->m_color = std::nullopt;
 	Engine::getSong()->setModified();
 	update();
 }