Copy/paste model values to system clipboard

Previously they were copy/pasted internally, and not visible across LMMS
instances.

include/AutomatableModel.h

@@ -96,11 +96,6 @@ public:
 	virtual ~AutomatableModel();
 
 
-	static float copiedValue()
-	{
-		return s_copiedValue;
-	}
-
 	bool isAutomated() const;
 	bool isAutomatedOrControlled() const
 	{
@@ -288,8 +283,6 @@ public:
 
 public slots:
 	virtual void reset();
-	virtual void copyValue();
-	virtual void pasteValue();
 	void unlinkControllerConnection();
 
 
@@ -352,8 +345,6 @@ private:
 	ControllerConnection* m_controllerConnection;
 
 
-	static float s_copiedValue;
-
 	ValueBuffer m_valueBuffer;
 	long m_lastUpdatedPeriod;
 	static long s_periodCounter;

include/AutomatableModelView.h

@@ -75,7 +75,6 @@ protected:
 
 	QString m_description;
 	QString m_unit;
-
 } ;
 
 
@@ -94,6 +93,11 @@ public slots:
 	void unlinkAllModels();
 	void removeSongGlobalAutomation();
 
+private slots:
+	/// Copy the model's value to the clipboard.
+	void copyToClipboard();
+	/// Paste the model's value from the clipboard.
+	void pasteFromClipboard();
 
 protected:
 	AutomatableModelView* m_amv;

src/core/AutomatableModel.cpp

@@ -31,7 +31,6 @@
 #include "Mixer.h"
 #include "ProjectJournal.h"
 
-float AutomatableModel::s_copiedValue = 0;
 long AutomatableModel::s_periodCounter = 0;
 
 
@@ -635,21 +634,6 @@ void AutomatableModel::reset()
 
 
 
-void AutomatableModel::copyValue()
-{
-	s_copiedValue = value<float>();
-}
-
-
-
-
-void AutomatableModel::pasteValue()
-{
-	setValue( copiedValue() );
-}
-
-
-
 float AutomatableModel::globalAutomationValueAt( const MidiTime& time )
 {
 	// get patterns that connect to this model

src/gui/AutomatableModelView.cpp

@@ -22,6 +22,8 @@
  *
  */
 
+#include <QApplication>
+#include <QClipboard>
 #include <QMenu>
 #include <QMouseEvent>
 
@@ -37,6 +39,7 @@
 #include "AutomationEditor.h"
 
 
+static float floatFromClipboard(bool* ok=nullptr);
 
 AutomatableModelView::AutomatableModelView( ::Model* model, QWidget* _this ) :
 	ModelView( model, _this ),
@@ -74,13 +77,18 @@ void AutomatableModelView::addDefaultActions( QMenu* menu )
 						AutomatableModel::tr( "&Copy value (%1%2)" ).
 							arg( model->displayValue( model->value<float>() ) ).
 							arg( m_unit ),
-						model, SLOT( copyValue() ) );
+						amvSlots, SLOT( copyToClipboard() ) );
 
-	menu->addAction( embed::getIconPixmap( "edit_paste" ),
-						AutomatableModel::tr( "&Paste value (%1%2)").
-							arg( model->displayValue( AutomatableModel::copiedValue() ) ).
-							arg( m_unit ),
-						model, SLOT( pasteValue() ) );
+	bool canPaste = true;
+	const float valueToPaste = floatFromClipboard(&canPaste);
+	const QString pasteDesc = canPaste ?
+					AutomatableModel::tr( "&Paste value (%1%2)").
+						arg( model->displayValue( valueToPaste ) ).
+						arg( m_unit )
+					: AutomatableModel::tr( "&Paste value");
+	QAction* pasteAction = menu->addAction( embed::getIconPixmap( "edit_paste" ),
+						pasteDesc, amvSlots, SLOT( pasteFromClipboard() ) );
+	pasteAction->setEnabled(canPaste);
 
 	menu->addSeparator();
 
@@ -162,7 +170,6 @@ void AutomatableModelView::mousePressEvent( QMouseEvent* event )
 
 
 
-
 AutomatableModelViewSlots::AutomatableModelViewSlots( AutomatableModelView* amv, QObject* parent ) :
 	QObject(),
 	m_amv( amv )
@@ -245,5 +252,26 @@ void AutomatableModelViewSlots::unlinkAllModels()
 	m_amv->modelUntyped()->unlinkAllModels();
 }
 
+void AutomatableModelViewSlots::copyToClipboard()
+{
+	QClipboard* clipboard = QApplication::clipboard();
+	clipboard->setText(QString::number(m_amv->value<float>()));
+}
+
+void AutomatableModelViewSlots::pasteFromClipboard()
+{
+	bool isNumber = false;
+	const float number = floatFromClipboard(&isNumber);
+	if (isNumber) {
+		m_amv->modelUntyped()->setValue(number);
+	}
+}
 
 
+/// Attempt to parse a float from the clipboard
+static float floatFromClipboard(bool* ok)
+{
+	const QClipboard* clipboard = QApplication::clipboard();
+	return clipboard->text().toFloat(ok);
+}
+