Improved: Updated to Visual Studio 2019 and Qt 5.15.2. Running Equalizer APO requires Universal CRT now, which means that Windows versions before 10 may need additional Windows updates or the Visual C++ Redistributable for Visual Studio 2015 - 2019 needs to be installed (installer provides assistance).

Editor/widgets/ChannelGraphItem.cpp

@@ -35,7 +35,7 @@ QRectF ChannelGraphItem::boundingRect() const
 	if (cachedRect.isNull())
 	{
 		QFontMetrics metrics(scene()->font());
-		int width = metrics.width(name);
+		int width = metrics.size(0, name).width();
 		// we only use upper case characters and digits, so everything is above the baseline
 		int height = metrics.ascent();
 		// make it at least quadratic

Editor/widgets/FrequencyPlotHRuler.cpp

@@ -63,7 +63,7 @@ void FrequencyPlotHRuler::paintEvent(QPaintEvent*)
 					text = QString("%0").arg(hz);
 				else
 					text = QString("%0k").arg(hz / 1000);
-				if (metrics.width(text) + 2 < s->hzToX(hz + hzBase) - x)
+				if (metrics.size(0, text).width() + 2 < s->hzToX(hz + hzBase) - x)
 					painter.drawText(x - topLeft.x() + offsetLeft + 1, 0, 0, height(), Qt::TextDontClip | Qt::AlignCenter, text);
 			}
 
@@ -125,7 +125,7 @@ void FrequencyPlotHRuler::paintEvent(QPaintEvent*)
 void FrequencyPlotHRuler::wheelEvent(QWheelEvent* event)
 {
 	FrequencyPlotView* view = qobject_cast<FrequencyPlotView*>(parentWidget());
-	view->zoom(event->angleDelta().y(), 0, event->x() - view->viewportMargins().left(), 0);
+	view->zoom(event->angleDelta().y(), 0, event->position().x() - view->viewportMargins().left(), 0);
 }
 
 void FrequencyPlotHRuler::mouseMoveEvent(QMouseEvent* event)

Editor/widgets/FrequencyPlotVRuler.cpp

@@ -101,5 +101,5 @@ void FrequencyPlotVRuler::wheelEvent(QWheelEvent* event)
 void FrequencyPlotVRuler::mouseMoveEvent(QMouseEvent* event)
 {
 	FrequencyPlotView* view = qobject_cast<FrequencyPlotView*>(parentWidget());
-	view->setLastMousePos(QPoint(0, min(event->y(), view->viewport()->height() - 1)));
+	view->setLastMousePos(QPoint(0, fmin(event->y(), view->viewport()->height() - 1)));
 }

Editor/widgets/FrequencyPlotView.cpp

@@ -179,7 +179,7 @@ void FrequencyPlotView::wheelEvent(QWheelEvent* event)
 {
 	event->accept();
 	int delta = event->angleDelta().y();
-	zoom(delta, delta, event->x(), event->y());
+	zoom(delta, delta, event->position().x(), event->position().y());
 }
 
 void FrequencyPlotView::scrollContentsBy(int dx, int dy)

Editor/widgets/MiddleClickTabBar.cpp

@@ -28,7 +28,7 @@ MiddleClickTabBar::MiddleClickTabBar(QWidget* parent)
 
 void MiddleClickTabBar::mouseReleaseEvent(QMouseEvent* event)
 {
-	if (event->button() == Qt::MidButton)
+	if (event->button() == Qt::MiddleButton)
 	{
 		int tabIndex = tabAt(event->pos());
 		if (tabIndex != -1)

Editor/widgets/ResizingLineEdit.cpp

@@ -40,8 +40,8 @@ QSize ResizingLineEdit::sizeHint() const
 	QSize originalSize = QLineEdit::sizeHint();
 
 	QFontMetrics metrics = fontMetrics();
-	QSize contentSize(metrics.width(text()), metrics.height());
-	QStyleOptionFrameV2 opt;
+	QSize contentSize(metrics.size(0, text()));
+	QStyleOptionFrame opt;
 	initStyleOption(&opt);
 
 	QSize size = style()->sizeFromContents(QStyle::CT_LineEdit, &opt, contentSize, this);