UI: Do not allow mouse wheel for volume slider

This commit fixes the issue of being able to scroll through the mixer
with the mouse wheel without modifying the volume slider.  This
functionality can be temporarily restored by holding a click on the
volume meter.

UI/slider-ignorewheel.cpp

@@ -5,6 +5,14 @@ SliderIgnoreScroll::SliderIgnoreScroll(QWidget *parent) : QSlider(parent)
 	setFocusPolicy(Qt::StrongFocus);
 }
 
+SliderIgnoreScroll::SliderIgnoreScroll(Qt::Orientation orientation,
+		QWidget *parent)
+	: QSlider(parent)
+{
+	setFocusPolicy(Qt::StrongFocus);
+	setOrientation(orientation);
+}
+
 void SliderIgnoreScroll::wheelEvent(QWheelEvent * event)
 {
 	if (!hasFocus())

UI/slider-ignorewheel.hpp

@@ -5,11 +5,14 @@
 #include <QtCore/QObject>
 
 
+
+
 class SliderIgnoreScroll : public QSlider {
 	Q_OBJECT
 
 public:
 	SliderIgnoreScroll(QWidget *parent = nullptr);
+	SliderIgnoreScroll(Qt::Orientation orientation, QWidget *parent = nullptr);
 
 protected:
 

UI/volume-control.cpp

@@ -2,11 +2,11 @@
 #include "qt-wrappers.hpp"
 #include "obs-app.hpp"
 #include "mute-checkbox.hpp"
+#include "slider-ignorewheel.hpp"
 #include "slider-absoluteset-style.hpp"
 #include <QFontDatabase>
 #include <QHBoxLayout>
 #include <QPushButton>
-#include <QSlider>
 #include <QLabel>
 #include <QPainter>
 #include <QStyleFactory>
@@ -123,6 +123,7 @@ VolControl::VolControl(OBSSource source_, bool showConfig, bool vertical)
 	nameLabel = new QLabel();
 	volLabel  = new QLabel();
 	mute      = new MuteCheckBox();
+
 	QString sourceName = obs_source_get_name(source);
 	setObjectName(sourceName);
 
@@ -153,7 +154,7 @@ VolControl::VolControl(OBSSource source_, bool showConfig, bool vertical)
 		QHBoxLayout *meterLayout  = new QHBoxLayout;
 
 		volMeter  = new VolumeMeter(nullptr, obs_volmeter, true);
-		slider    = new QSlider(Qt::Vertical);
+		slider    = new SliderIgnoreScroll(Qt::Vertical);
 
 		nameLayout->setAlignment(Qt::AlignCenter);
 		meterLayout->setAlignment(Qt::AlignCenter);
@@ -188,6 +189,8 @@ VolControl::VolControl(OBSSource source_, bool showConfig, bool vertical)
 		mainLayout->addItem(meterLayout);
 		mainLayout->addItem(controlLayout);
 
+		volMeter->setFocusProxy(slider);
+
 		setMaximumWidth(110);
 	} else {
 		QHBoxLayout *volLayout  = new QHBoxLayout;
@@ -195,7 +198,7 @@ VolControl::VolControl(OBSSource source_, bool showConfig, bool vertical)
 		QHBoxLayout *botLayout  = new QHBoxLayout;
 
 		volMeter  = new VolumeMeter(nullptr, obs_volmeter, false);
-		slider    = new QSlider(Qt::Horizontal);
+		slider    = new SliderIgnoreScroll(Qt::Horizontal);
 
 		textLayout->setContentsMargins(0, 0, 0, 0);
 		textLayout->addWidget(nameLabel);
@@ -217,6 +220,8 @@ VolControl::VolControl(OBSSource source_, bool showConfig, bool vertical)
 		mainLayout->addItem(textLayout);
 		mainLayout->addWidget(volMeter);
 		mainLayout->addItem(botLayout);
+
+		volMeter->setFocusProxy(slider);
 	}
 
 	setLayout(mainLayout);
@@ -227,6 +232,7 @@ VolControl::VolControl(OBSSource source_, bool showConfig, bool vertical)
 	nameLabel->setText(sourceName);
 	nameLabel->setFont(font);
 	volLabel->setFont(font);
+
 	slider->setMinimum(0);
 	slider->setMaximum(100);
 
@@ -498,6 +504,21 @@ void VolumeMeter::setPeakMeterType(enum obs_peak_meter_type peakMeterType)
 	}
 }
 
+void VolumeMeter::mousePressEvent(QMouseEvent * event)
+{
+	setFocus(Qt::MouseFocusReason);
+}
+
+void VolumeMeter::wheelEvent(QWheelEvent * event)
+{
+	QApplication::sendEvent(focusProxy(), event);
+}
+
+void VolumeMeter::leaveEvent(QEvent * event)
+{
+	clearFocus();
+}
+
 VolumeMeter::VolumeMeter(QWidget *parent, obs_volmeter_t *obs_volmeter,
 		bool vertical)
 		: QWidget(parent), obs_volmeter(obs_volmeter),

UI/volume-control.hpp

@@ -198,6 +198,9 @@ public:
 	qreal getInputPeakHoldDuration() const;
 	void setInputPeakHoldDuration(qreal v);
 	void setPeakMeterType(enum obs_peak_meter_type peakMeterType);
+	virtual void mousePressEvent(QMouseEvent *event) override;
+	virtual void wheelEvent(QWheelEvent *event) override;
+	virtual void leaveEvent(QEvent *event) override;
 
 protected:
 	void paintEvent(QPaintEvent *event) override;