Automatically assign a midi input device to the selected track

include/InstrumentTrack.h

@@ -219,6 +219,8 @@ class LMMS_EXPORT InstrumentTrack : public Track, public MidiEventProcessor
 		return m_previewMode;
 	}
 
+	void autoAssignMidiDevice( bool );
+
 signals:
 	void instrumentChanged();
 	void midiNoteOn( const Note& );
@@ -260,6 +262,9 @@ protected slots:
 
 	bool m_previewMode;
 
+	bool m_hasAutoMidiDev;
+	static InstrumentTrack *s_autoAssignedTrack;
+
 	IntModel m_baseNoteModel;
 
 	NotePlayHandleList m_processHandles;

include/PianoRoll.h

@@ -178,6 +178,7 @@ class PianoRoll : public QWidget
 	void resizeEvent( QResizeEvent * re ) override;
 	void wheelEvent( QWheelEvent * we ) override;
 	void focusOutEvent( QFocusEvent * ) override;
+	void focusInEvent( QFocusEvent * ) override;
 
 	int getKey( int y ) const;
 	void drawNoteRect( QPainter & p, int x, int y,

include/PianoView.h

@@ -56,6 +56,7 @@ class PianoView : public QWidget, public ModelView
 	void mouseReleaseEvent( QMouseEvent * me ) override;
 	void mouseMoveEvent( QMouseEvent * me ) override;
 	void focusOutEvent( QFocusEvent * _fe ) override;
+	void focusInEvent( QFocusEvent * fe ) override;
 	void resizeEvent( QResizeEvent * _event ) override;
 
 

include/SetupDialog.h

@@ -175,6 +175,7 @@ private slots:
 	QComboBox * m_midiInterfaces;
 	MswMap m_midiIfaceSetupWidgets;
 	trMap m_midiIfaceNames;
+	QComboBox * m_assignableMidiDevices;
 
 	// Paths settings widgets.
 	QString m_workingDir;

src/gui/PianoView.cpp

@@ -673,10 +673,17 @@ void PianoView::focusOutEvent( QFocusEvent * )
 		m_piano->midiEventProcessor()->processInEvent( MidiEvent( MidiNoteOff, -1, i, 0 ) );
 		m_piano->setKeyState( i, false );
 	}
+
+
 	update();
 }
 
 
+void PianoView::focusInEvent( QFocusEvent * )
+{
+	m_piano->instrumentTrack()->autoAssignMidiDevice(true);
+}
+
 
 
 /*! \brief update scrollbar range after resize

src/gui/SetupDialog.cpp

@@ -677,9 +677,32 @@ SetupDialog::SetupDialog(ConfigTabs tab_to_open) :
 			this, SLOT(midiInterfaceChanged(const QString &)));
 
 
+	// MIDI autoassign tab.
+	TabWidget * midiAutoAssign_tw = new TabWidget(
+			tr("Automatically assign MIDI controller to selected track"), midi_w);
+	midiAutoAssign_tw->setFixedHeight(56);
+
+	m_assignableMidiDevices = new QComboBox(midiAutoAssign_tw);
+	m_assignableMidiDevices->setGeometry(10, 20, 240, 28);
+	m_assignableMidiDevices->addItem("none");
+	if ( !Engine::mixer()->midiClient()->isRaw() )
+	{
+		m_assignableMidiDevices->addItems(Engine::mixer()->midiClient()->readablePorts());
+	}
+	else
+	{
+		m_assignableMidiDevices->addItem("all");
+	}
+	int current = m_assignableMidiDevices->findText(ConfigManager::inst()->value("midi", "midiautoassign"));
+	if (current >= 0)
+	{
+		m_assignableMidiDevices->setCurrentIndex(current);
+	}
+
 	// MIDI layout ordering.
 	midi_layout->addWidget(midiiface_tw);
 	midi_layout->addWidget(ms_w);
+	midi_layout->addWidget(midiAutoAssign_tw);
 	midi_layout->addStretch();
 
 
@@ -917,6 +940,8 @@ void SetupDialog::accept()
 					QString::number(m_bufferSize));
 	ConfigManager::inst()->setValue("mixer", "mididev",
 					m_midiIfaceNames[m_midiInterfaces->currentText()]);
+	ConfigManager::inst()->setValue("midi", "midiautoassign",
+					m_assignableMidiDevices->currentText());
 
 
 	ConfigManager::inst()->setWorkingDir(QDir::fromNativeSeparators(m_workingDir));

src/gui/editors/PianoRoll.cpp

@@ -3661,6 +3661,14 @@ void PianoRoll::focusOutEvent( QFocusEvent * )
 	update();
 }
 
+void PianoRoll::focusInEvent( QFocusEvent * )
+{
+	if ( hasValidPattern() )
+	{
+		// Assign midi device
+		m_pattern->instrumentTrack()->autoAssignMidiDevice(true);
+	}
+}
 
 
 

src/tracks/InstrumentTrack.cpp

@@ -97,6 +97,7 @@ InstrumentTrack::InstrumentTrack( TrackContainer* tc ) :
 	m_sustainPedalPressed( false ),
 	m_silentBuffersProcessed( false ),
 	m_previewMode( false ),
+	m_hasAutoMidiDev( false ),
 	m_baseNoteModel( 0, 0, KeysPerOctave * NumOctaves - 1, this,
 							tr( "Base note" ) ),
 	m_volumeModel( DefaultVolume, MinVolume, MaxVolume, 0.1f, this, tr( "Volume" ) ),
@@ -149,6 +150,13 @@ int InstrumentTrack::baseNote() const
 
 InstrumentTrack::~InstrumentTrack()
 {
+	// De-assign midi device
+	if (m_hasAutoMidiDev)
+	{
+		autoAssignMidiDevice(false);
+		s_autoAssignedTrack = NULL;
+	}
+
 	// kill all running notes and the iph
 	silenceAllNotes( true );
 
@@ -760,7 +768,13 @@ void InstrumentTrack::saveTrackSpecificSettings( QDomDocument& doc, QDomElement
 	if (Engine::getSong()->isSavingProject()
 		&& !Engine::getSong()->getSaveOptions().discardMIDIConnections.value())
 	{
+		// Don't save auto assigned midi device connection
+		bool hasAuto = m_hasAutoMidiDev;
+		autoAssignMidiDevice(false);
+
 		m_midiPort.saveState( doc, thisElement );
+
+		autoAssignMidiDevice(hasAuto);
 	}
 
 	m_audioPort.effects()->saveState( doc, thisElement );
@@ -908,6 +922,38 @@ Instrument * InstrumentTrack::loadInstrument(const QString & _plugin_name,
 
 
 
+InstrumentTrack *InstrumentTrack::s_autoAssignedTrack = NULL;
+
+/*! \brief Automatically assign a midi controller to this track, based on the midiautoassign setting
+ *
+ *  \param assign set to true to connect the midi device, set to false to disconnect
+ */
+void InstrumentTrack::autoAssignMidiDevice(bool assign)
+{
+	if (assign)
+	{
+		if (s_autoAssignedTrack)
+		{
+			s_autoAssignedTrack->autoAssignMidiDevice(false);
+		}
+		s_autoAssignedTrack = this;
+	}
+
+	const QString &device = ConfigManager::inst()->value("midi", "midiautoassign");
+	if ( Engine::mixer()->midiClient()->isRaw() && device != "none" )
+	{
+		m_midiPort.setReadable( assign );
+		return;
+	}
+
+	// Check if the device exists
+	if ( Engine::mixer()->midiClient()->readablePorts().indexOf(device) >= 0 )
+	{
+		m_midiPort.subscribeReadablePort(device, assign);
+		m_hasAutoMidiDev = assign;
+	}
+}
+
 
 
 // #### ITV: