Use layouts for the instrument sound shaping tab / Extract classes for Envelope and LFO graphs (#7193)

Move the envelope and LFO graphs into their own classes.

Besides the improved code organization this step had to be done to be able to use layouts in `EnvelopeAndLfoView`. The class previously had fixed layouts mixed with custom rendering in the paint event. Mouse events are now also handled in both new classes instead of in `EnvelopeAndLfoView`.

## Layouts in EnvelopeAndLfoView
Use layouts to align the elements of the `EnvelopeAndLfoView`. This removes lots of hard-coded values. Add helper lambdas for the repeated creation of `Knob` and `PixmapButton` instances.

The spacing that is explicitly introduced between the envelope and LFO should be removed once there is a more open layout.

## Layouts for InstrumentSoundShapingView
Use layouts to align the elements of the `InstrumentSoundShapingView`.

## Info text improvements in LFO graph
Draw the info text at around 20% of the LFO graph's height. This prepares the dialog to be scaled later.

Write "1000 ms/LFO" instead of "ms/LFO: 1000" with a larger gap.

## Accessors for EnvelopeAndLfoParameters
Make the enum `LfoShape` in `EnvelopeAndLfoParameters` public so that it can be used without friend declarations. Add accessor methods for the model of the LFO.

## Other improvements
* Adjust include orders
* Variable initialization in headers
* Prevention of most vexing parses

include/EnvelopeAndLfoParameters.h

@@ -71,7 +71,18 @@ public:
 		using LfoList = QList<EnvelopeAndLfoParameters*>;
 		LfoList m_lfos;
 
-	} ;
+	};
+
+	enum class LfoShape
+	{
+		SineWave,
+		TriangleWave,
+		SawWave,
+		SquareWave,
+		UserDefinedWave,
+		RandomWave,
+		Count
+	};
 
 	EnvelopeAndLfoParameters( float _value_for_zero_amount,
 							Model * _parent );
@@ -114,6 +125,28 @@ public:
 		return m_rFrames;
 	}
 
+	// Envelope
+	const FloatModel& getPredelayModel() const { return m_predelayModel; }
+	const FloatModel& getAttackModel() const { return m_attackModel; }
+	const FloatModel& getHoldModel() const { return m_holdModel; }
+	const FloatModel& getDecayModel() const { return m_decayModel; }
+	const FloatModel& getSustainModel() const { return m_sustainModel; }
+	const FloatModel& getReleaseModel() const { return m_releaseModel; }
+	const FloatModel& getAmountModel() const { return m_amountModel; }
+	FloatModel& getAmountModel() { return m_amountModel; }
+
+
+	// LFO
+	inline f_cnt_t getLfoPredelayFrames() const { return m_lfoPredelayFrames; }
+	inline f_cnt_t getLfoAttackFrames() const { return m_lfoAttackFrames; }
+	inline f_cnt_t getLfoOscillationFrames() const { return m_lfoOscillationFrames; }
+
+	const FloatModel& getLfoAmountModel() const { return m_lfoAmountModel; }
+	FloatModel& getLfoAmountModel() { return m_lfoAmountModel; }
+	const TempoSyncKnobModel& getLfoSpeedModel() const { return m_lfoSpeedModel; }
+	const BoolModel& getX100Model() const { return m_x100Model; }
+	const IntModel& getLfoWaveModel() const { return m_lfoWaveModel; }
+	std::shared_ptr<const SampleBuffer> getLfoUserWave() const { return m_userWave; }
 
 public slots:
 	void updateSampleVars();
@@ -170,16 +203,6 @@ private:
 	bool m_bad_lfoShapeData;
 	std::shared_ptr<const SampleBuffer> m_userWave = SampleBuffer::emptyBuffer();
 
-	enum class LfoShape
-	{
-		SineWave,
-		TriangleWave,
-		SawWave,
-		SquareWave,
-		UserDefinedWave,
-		RandomWave,
-		Count
-	} ;
 	constexpr static auto NumLfoShapes = static_cast<std::size_t>(LfoShape::Count);
 
 	sample_t lfoShapeSample( fpp_t _frame_offset );

include/EnvelopeAndLfoView.h

@@ -29,10 +29,6 @@
 #include <QWidget>
 
 #include "ModelView.h"
-#include "embed.h"
-
-class QPaintEvent;
-class QPixmap;
 
 namespace lmms
 {
@@ -47,6 +43,8 @@ class Knob;
 class LedCheckBox;
 class PixmapButton;
 class TempoSyncKnob;
+class EnvelopeGraph;
+class LfoGraph;
 
 
 
@@ -63,8 +61,6 @@ protected:
 
 	void dragEnterEvent( QDragEnterEvent * _dee ) override;
 	void dropEvent( QDropEvent * _de ) override;
-	void mousePressEvent( QMouseEvent * _me ) override;
-	void paintEvent( QPaintEvent * _pe ) override;
 
 
 protected slots:
@@ -72,13 +68,10 @@ protected slots:
 
 
 private:
-	QPixmap m_envGraph = embed::getIconPixmap("envelope_graph");
-	QPixmap m_lfoGraph = embed::getIconPixmap("lfo_graph");
-
 	EnvelopeAndLfoParameters * m_params;
 
-
 	// envelope stuff
+	EnvelopeGraph* m_envelopeGraph;
 	Knob * m_predelayKnob;
 	Knob * m_attackKnob;
 	Knob * m_holdKnob;
@@ -88,6 +81,7 @@ private:
 	Knob * m_amountKnob;
 
 	// LFO stuff
+	LfoGraph* m_lfoGraph;
 	Knob * m_lfoPredelayKnob;
 	Knob * m_lfoAttackKnob;
 	TempoSyncKnob * m_lfoSpeedKnob;
@@ -97,8 +91,6 @@ private:
 
 	LedCheckBox * m_x100Cb;
 	LedCheckBox * m_controlEnvAmountCb;
-	
-	float m_randomGraph;
 } ;
 
 } // namespace gui

include/EnvelopeGraph.h

@@ -0,0 +1,66 @@
+/*
+ * EnvelopeGraph.h - Displays envelope graphs
+ *
+ * Copyright (c) 2004-2009 Tobias Doerffel <tobydox/at/users.sourceforge.net>
+ * Copyright (c) 2024-     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_ENVELOPE_GRAPH_H
+#define LMMS_GUI_ENVELOPE_GRAPH_H
+
+#include <QWidget>
+
+#include "ModelView.h"
+#include "embed.h"
+
+namespace lmms
+{
+
+class EnvelopeAndLfoParameters;
+
+namespace gui
+{
+
+class EnvelopeGraph : public QWidget, public ModelView
+{
+public:
+	EnvelopeGraph(QWidget* parent);
+
+protected:
+	void modelChanged() override;
+
+	void mousePressEvent(QMouseEvent* me) override;
+	void paintEvent(QPaintEvent* pe) override;
+
+private:
+	void toggleAmountModel();
+
+private:
+	QPixmap m_envGraph = embed::getIconPixmap("envelope_graph");
+
+	EnvelopeAndLfoParameters* m_params;
+};
+
+} // namespace gui
+
+} // namespace lmms
+
+#endif // LMMS_GUI_ENVELOPE_GRAPH_H

include/InstrumentSoundShapingView.h

@@ -56,7 +56,7 @@ private:
 	void modelChanged() override;
 
 
-	InstrumentSoundShaping * m_ss;
+	InstrumentSoundShaping * m_ss = nullptr;
 	TabWidget * m_targetsTabWidget;
 	EnvelopeAndLfoView * m_envLfoViews[InstrumentSoundShaping::NumTargets];
 

include/LfoGraph.h

@@ -0,0 +1,68 @@
+/*
+ * LfoGraph.h - Displays LFO graphs
+ *
+ * Copyright (c) 2004-2009 Tobias Doerffel <tobydox/at/users.sourceforge.net>
+ * Copyright (c) 2024-     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_LFO_GRAPH_H
+#define LMMS_GUI_LFO_GRAPH_H
+
+#include <QWidget>
+
+#include "ModelView.h"
+#include "embed.h"
+
+namespace lmms
+{
+
+class EnvelopeAndLfoParameters;
+
+namespace gui
+{
+
+class LfoGraph : public QWidget, public ModelView
+{
+public:
+	LfoGraph(QWidget* parent);
+
+protected:
+	void modelChanged() override;
+
+	void mousePressEvent(QMouseEvent* me) override;
+	void paintEvent(QPaintEvent* pe) override;
+
+private:
+	void toggleAmountModel();
+
+private:
+	QPixmap m_lfoGraph = embed::getIconPixmap("lfo_graph");
+
+	EnvelopeAndLfoParameters* m_params = nullptr;
+
+	float m_randomGraph {0.};
+};
+
+} // namespace gui
+
+} // namespace lmms
+
+#endif // LMMS_GUI_LFO_GRAPH_H