VstEmbed: Support changing embed method without restart

include/ConfigManager.h

@@ -32,9 +32,9 @@
 #include <QtCore/QPair>
 #include <QtCore/QStringList>
 #include <QtCore/QVector>
+#include <QtCore/QObject>
 
 #include "export.h"
-#include "MemoryManager.h"
 
 class LmmsCore;
 
@@ -51,9 +51,9 @@ const QString TRACK_ICON_PATH = "track_icons/";
 const QString LOCALE_PATH = "locale/";
 
 
-class EXPORT ConfigManager
+class EXPORT ConfigManager : public QObject
 {
-	MM_OPERATORS
+	Q_OBJECT
 public:
 	static inline ConfigManager * inst()
 	{
@@ -244,6 +244,8 @@ public:
 	// creates the working directory & subdirectories on disk.
 	void createWorkingDir();
 
+signals:
+	void valueChanged( QString cls, QString attribute, QString value );
 
 private:
 	static ConfigManager * s_instanceOfMe;

plugins/vestige/vestige.cpp

@@ -32,6 +32,7 @@
 #include <QMenu>
 #include <QDomElement>
 
+#include "ConfigManager.h"
 #include "BufferManager.h"
 #include "Engine.h"
 #include "gui_templates.h"
@@ -89,6 +90,10 @@ vestigeInstrument::vestigeInstrument( InstrumentTrack * _instrument_track ) :
 	// now we need a play-handle which cares for calling play()
 	InstrumentPlayHandle * iph = new InstrumentPlayHandle( this, _instrument_track );
 	Engine::mixer()->addPlayHandle( iph );
+
+	connect( ConfigManager::inst(), SIGNAL( valueChanged(QString,QString,QString) ),
+			 this, SLOT( handleConfigChange(QString, QString, QString) ),
+			 Qt::QueuedConnection );
 }
 
 
@@ -170,6 +175,20 @@ void vestigeInstrument::setParameter( void )
 	}
 }
 
+void vestigeInstrument::handleConfigChange(QString cls, QString attr, QString value)
+{
+	if ( cls == "ui" && attr == "vstembedmethod" )
+	{
+		reloadPlugin();
+	}
+}
+
+void vestigeInstrument::reloadPlugin()
+{
+	closePlugin();
+	loadFile( m_pluginDLL );
+}
+
 
 
 
@@ -366,10 +385,6 @@ void vestigeInstrument::closePlugin( void )
 	}
 
 	m_pluginMutex.lock();
-	if( m_plugin )
-	{
-		delete m_plugin->pluginWidget();
-	}
 	delete m_plugin;
 	m_plugin = NULL;
 	m_pluginMutex.unlock();

plugins/vestige/vestige.h

@@ -74,6 +74,8 @@ public:
 
 protected slots:
 	void setParameter( void );
+	void handleConfigChange( QString cls, QString attr, QString value );
+	void reloadPlugin();
 
 private:
 	void closePlugin( void );

plugins/vst_base/VstPlugin.cpp

@@ -587,9 +587,9 @@ void VstPlugin::showUI()
 
 void VstPlugin::hideUI()
 {
-	RemotePlugin::hideUI();
 	if ( m_embedMethod == "none" )
 	{
+		RemotePlugin::hideUI();
 	}
 	else if ( pluginWidget() != nullptr )
 	{

src/core/ConfigManager.cpp

@@ -352,12 +352,15 @@ void ConfigManager::setValue( const QString & cls,
 {
 	if( m_settings.contains( cls ) )
 	{
-		for( stringPairVector::iterator it = m_settings[cls].begin();
-					it != m_settings[cls].end(); ++it )
+		for( QPair<QString, QString>& pair : m_settings[cls])
 		{
-			if( ( *it ).first == attribute )
+			if( pair.first == attribute )
 			{
-				( *it ).second = value;
+				if ( pair.second != value )
+				{
+					pair.second = value;
+					emit valueChanged( cls, attribute, value );
+				}
 				return;
 			}
 		}

src/gui/SetupDialog.cpp

@@ -1019,6 +1019,20 @@ SetupDialog::~SetupDialog()
 
 void SetupDialog::accept()
 {
+	if( m_warnAfterSetup )
+	{
+		QMessageBox::information( NULL, tr( "Restart LMMS" ),
+					tr( "Please note that most changes "
+						"won't take effect until "
+						"you restart LMMS!" ),
+					QMessageBox::Ok );
+	}
+
+	// Hide dialog before setting values. This prevents an obscure bug
+	// where non-embedded VST windows would steal focus and prevent LMMS
+	// from taking mouse input, rendering the application unusable.
+	QDialog::accept();
+
 	ConfigManager::inst()->setValue( "mixer", "framesperaudiobuffer",
 					QString::number( m_bufferSize ) );
 	ConfigManager::inst()->setValue( "mixer", "audiodev",
@@ -1094,16 +1108,6 @@ void SetupDialog::accept()
 	}
 
 	ConfigManager::inst()->saveConfigFile();
-
-	QDialog::accept();
-	if( m_warnAfterSetup )
-	{
-		QMessageBox::information( NULL, tr( "Restart LMMS" ),
-					tr( "Please note that most changes "
-						"won't take effect until "
-						"you restart LMMS!" ),
-					QMessageBox::Ok );
-	}
 }