Add bar controller with tempo sync option

Add `TempoSyncBarModelEditor` which adds a tempo sync option to a `BarModelEditor`. Please note that the code was mostly copied and adjusted from the `TempoSyncKnob` class. It was not attempted yet to unify some of the code because with the current design it seems to be a road to "inheritance hell". A better solution might be to refactor the code so that it is more composable.

Another option might be to move the tempo sync functionality into a class like `FloatModelEditorBase`. Although this would not be a 100% right place either because `TempoSyncKnobModel` inherits from `FloatModel`. In that case we'd have specialized code in a generic base class.

Adjust `LadspaWidgetFactory` so that it now returns an instance of a `TempoSyncBarModelEditor` instead of a `TempoSyncKnob`.

Remove the extra layout code from `LadspaMatrixControlDialog.cpp` as most things are bar editors now.

Adjust `TempoSyncKnobModel` so we do not have to make `TempoSyncBarModelEditor` a friend of it.

include/TempoSyncBarModelEditor.h

@@ -0,0 +1,88 @@
+/*
+ * TempoSyncBarModelEditor.h - adds bpm to ms conversion for the bar editor class
+ *
+ * Copyright (c) 2005-2008 Danny McRae <khjklujn/at/yahoo.com>
+ * Copyright (c) 2009-2014 Tobias Doerffel <tobydox/at/users.sourceforge.net>
+ * Copyright (c) 2023 Michael Gregorius
+ *
+ * This file is part of LMMS - https://lmms.io
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef LMMS_GUI_TEMPO_SYNC_BAR_MODEL_EDITOR_H
+#define LMMS_GUI_TEMPO_SYNC_BAR_MODEL_EDITOR_H
+
+#include <QPixmap>
+#include <QPointer>
+
+#include "BarModelEditor.h"
+#include "TempoSyncKnobModel.h"
+
+namespace lmms::gui
+{
+
+class MeterDialog;
+
+class LMMS_EXPORT TempoSyncBarModelEditor : public BarModelEditor
+{
+	Q_OBJECT
+public:
+	TempoSyncBarModelEditor(QString text, FloatModel * floatModel, QWidget * parent = nullptr);
+	~TempoSyncBarModelEditor() override;
+
+	const QString & syncDescription();
+	void setSyncDescription( const QString & _new_description );
+
+	const QPixmap & syncIcon();
+	void setSyncIcon( const QPixmap & _new_pix );
+
+	TempoSyncKnobModel * model()
+	{
+		return castModel<TempoSyncKnobModel>();
+	}
+
+	void modelChanged() override;
+
+
+signals:
+	void syncDescriptionChanged( const QString & _new_description );
+	void syncIconChanged();
+
+
+protected:
+	void contextMenuEvent( QContextMenuEvent * _me ) override;
+
+
+protected slots:
+	void updateDescAndIcon();
+	void showCustom();
+
+
+private:
+	QPixmap m_tempoSyncIcon;
+	QString m_tempoSyncDescription;
+
+	QPointer<MeterDialog> m_custom;
+
+} ;
+
+
+
+} // namespace lmms::gui
+
+#endif // LMMS_GUI_TEMPO_SYNC_BAR_MODEL_EDITOR_H

include/TempoSyncKnobModel.h

@@ -82,6 +82,9 @@ public:
 
 	void setScale( float _new_scale );
 
+	MeterModel & getCustomMeterModel() { return m_custom; }
+	MeterModel const & getCustomMeterModel() const { return m_custom; }
+
 signals:
 	void syncModeChanged( lmms::TempoSyncKnobModel::SyncMode _new_mode );
 	void scaleChanged( float _new_scale );